Daniel Worrall
Use the TLV320 with in-built I2S object to stream audio data from an SD Card and send it to the TLV320 CODEC for audio playback
Dependencies: I2SSlave mbed TLV320
Revision 0:3d6892f6384f, committed 2011-08-05
- Comitter:
- d_worrall
- Date:
- Fri Aug 05 10:07:47 2011 +0000
- Child:
- 1:9ea0cc2fa567
- Commit message:
- version 2.0
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/FATFileSystem.lib Fri Aug 05 10:07:47 2011 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_unsupported/code/fatfilesystem/ \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/I2SSlave/I2SSlave.cpp Fri Aug 05 10:07:47 2011 +0000
@@ -0,0 +1,306 @@
+/******************************************************
+ * I2SSlave.cpp: I2S port abstraction library cpp file for NXP LPC1768
+ *
+ * Written by:
+ * mbed Team - 15th July 2011
+ * Daniel Worrall
+ *
+ * History
+ * version 1.31
+******************************************************/
+#include "I2SSlave.h"
+/*Global Functions*/
+FunctionPointer akjnh3489v8ncv;
+
+extern "C" void I2S_IRQHandler(void){ //this is a very special function so can remain outside
+ akjnh3489v8ncv.call();
+}
+/******************************************************
+ * Function name: I2SSlave
+ *
+ * Description: class constructor
+ *
+ * Parameters: PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws
+ * Returns: none
+******************************************************/
+//Constructor
+I2SSlave::I2SSlave(PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws){
+ storePins_(tx_sda, tx_ws, clk, rx_sda, rx_ws);
+ format(16, STEREO); //this also invokes initialize so no need to call it twice
+}
+//Public functions
+/******************************************************
+ * Function name: format()
+ *
+ * Description: sets the bit length for writing and stereo or mono mode
+ *
+ * Parameters: int bit, bool mode
+ * Returns: none
+******************************************************/
+void I2SSlave::format(int bit, bool mode){
+ bit_ = bit;
+ mode_ = mode;
+ initialize_(tx_sda_, tx_ws_, clk_, rx_sda_, rx_ws_);
+}
+/******************************************************
+ * Function name: write()
+ *
+ * Description: load buffer to write to I2S port
+ *
+ * Parameters: long *buffer
+ * Returns: none
+******************************************************/
+void I2SSlave::write(int* buffer, int from, int length){
+ int to = from + length;
+ for(int i = from; i < to; ++i){
+ LPC_I2S->I2STXFIFO = buffer[i];
+ }
+}
+/******************************************************
+ * Function name: start()
+ *
+ * Description: attach streamOut_ function to ticker interrupt
+ *
+ * Parameters: none
+ * Returns: none
+******************************************************/
+void I2SSlave::start(int mode){
+ switch(mode){
+ case(0):
+ LPC_I2S->I2SIRQ |= (0 << 0); //disable receive interrupt
+ LPC_I2S->I2SIRQ |= (0 << 1); //disable transmit interrupt
+ break;
+ case(1):
+ LPC_I2S->I2SIRQ |= (0 << 0); //disable receive interrupt
+ LPC_I2S->I2SIRQ |= (1 << 1); //enable transmit interrupt
+ LPC_I2S->I2SIRQ |= (0 << 16); //set I2STXFIFO depth to 0 words
+ break;
+ case(2):
+ LPC_I2S->I2SIRQ |= (1 << 0); //enable receive interrupt
+ LPC_I2S->I2SIRQ |= (0 << 1); //disable transmit interrupt
+ LPC_I2S->I2SIRQ |= (4 << 8); //set I2SRXFIFO depth to 4 words
+ break;
+ case(3):
+ LPC_I2S->I2SIRQ |= (1 << 0); //enable receive interrupt
+ LPC_I2S->I2SIRQ |= (4 << 8); //set I2SRXFIFO depth to 4 words
+ LPC_I2S->I2SIRQ |= (1 << 1); //enable transmit interrupt
+ LPC_I2S->I2SIRQ |= (0 << 16); //set I2STXFIFO depth to 0 words
+ break;
+ default:
+ break;
+ }
+ NVIC_SetPriority(I2S_IRQn, 0);
+ NVIC_EnableIRQ(I2S_IRQn); //enable I2S interrupt in the NVIC
+}
+/******************************************************
+ * Function name: stop()
+ *
+ * Description: detach streamOut_ from ticker
+ *
+ * Parameters: none
+ * Returns: none
+******************************************************/
+void I2SSlave::stop(void){
+ NVIC_DisableIRQ(I2S_IRQn);
+}
+/******************************************************
+ * Function name: read()
+ *
+ * Description: reads FIFORX buffer into [int32_t rxBuffer[8]]
+ *
+ * Parameters: none
+ * Returns: none
+******************************************************/
+void I2SSlave::read(void){
+ rxBuffer[0] = LPC_I2S->I2SRXFIFO;
+ rxBuffer[1] = LPC_I2S->I2SRXFIFO;
+ rxBuffer[2] = LPC_I2S->I2SRXFIFO;
+ rxBuffer[3] = LPC_I2S->I2SRXFIFO;
+}
+/******************************************************
+ * Function name: status_()
+ *
+ * Description: Read I2SSTATE register
+ *
+ * Parameters: none
+ * Returns: int
+******************************************************/
+int I2SSlave::status(void){
+ return LPC_I2S->I2SSTATE;
+}
+//Private functions
+/******************************************************
+ * Function name: initialize()
+ *
+ * Description: initialises I2S port
+ *
+ * Parameters: PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws
+ * Returns: 0 = successful initialisation
+ -1 = initialisation failure
+******************************************************/
+int I2SSlave::initialize_(PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws){
+ setPins_(tx_sda, tx_ws, clk, rx_sda, rx_ws); //designate pins
+ LPC_SC->PCONP |= (1 << 27);
+ //configure input/output register
+ format_(bit_, mode_);
+ //set mbed as SLAVE
+ LPC_I2S->I2SDAO |= (1 << 5);
+ LPC_I2S->I2SDAI |= (1 << 5);
+ //clock mode
+ setClocks_(4);
+ //set slave mode
+ modeConfig_();
+ //set receiver mode
+ LPC_I2S->I2SRXMODE |= (1 << 1);
+ //slave mode
+ LPC_I2S->I2STXRATE = 0;
+ LPC_I2S->I2SRXRATE = 0;
+ //Start
+ LPC_I2S->I2SDAO |= (0 << 3);
+ LPC_I2S->I2SDAI |= (0 << 3);
+ LPC_I2S->I2SDAO |= (0 << 4);
+ LPC_I2S->I2SDAI |= (0 << 4);
+ LPC_I2S->I2SDAO |= (0 << 15);
+ return 0;
+}
+/******************************************************
+ * Function name: setClocks_()
+ *
+ * Description: Set the division setting on the internal clocks
+ *
+ * Parameters: int divideBy
+ * Returns: nothing
+******************************************************/
+void I2SSlave::setClocks_(int divideBy){
+ switch(divideBy){
+ case 1:
+ LPC_SC->PCLKSEL1 |= (1 << 22);
+ LPC_SC->PCLKSEL1 |= (0 << 23);
+ break;
+ case 2:
+ LPC_SC->PCLKSEL1 |= (0 << 22);
+ LPC_SC->PCLKSEL1 |= (1 << 23);
+ break;
+ case 4:
+ LPC_SC->PCLKSEL1 |= (0 << 22);
+ LPC_SC->PCLKSEL1 |= (0 << 23);
+ break;
+ case 8:
+ LPC_SC->PCLKSEL1 |= (1 << 22);
+ LPC_SC->PCLKSEL1 |= (1 << 23);
+ break;
+ default:
+ break;
+ }
+}
+/******************************************************
+ * Function name: setPins_()
+ *
+ * Description: set external pin configuration
+ *
+ * Parameters: PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws
+ * Returns: none
+******************************************************/
+void I2SSlave::setPins_(PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws){
+ if(rx_ws == p29){
+ LPC_PINCON->PINSEL0 |= (1 << 10); //set p29 as receive word select line
+ } else {
+ LPC_PINCON->PINSEL1 |= (2 << 16); //set p16 as receive word select line
+ }
+ if(rx_sda == p8){
+ LPC_PINCON->PINSEL0 |= (1 << 12); //set p8 as receive serial data line
+ } else {
+ LPC_PINCON->PINSEL1 |= (2 << 18); //set p17 as receive serial data line
+ }
+ LPC_PINCON->PINSEL0 |= (1 << 14); //set p7 as transmit clock line (only one of these)
+ LPC_PINCON->PINSEL0 |= (1 << 16); //set p6 as word select line (only one of these)
+ LPC_PINCON->PINSEL0 |= (1 << 18); //set p5 as transmit serial data line (only one of these)
+ LPC_PINCON->PINSEL0 |= (0 << 8); //clear rx_clk
+}
+/******************************************************
+ * Function name: format_()
+ *
+ * Description: sets the bit length for writing and stereo or mono mode
+ *
+ * Parameters: int bit, bool mode
+ * Returns: none
+******************************************************/
+void I2SSlave::format_(int bit, bool mode){
+ uint32_t bps= ((bit+1)*8)-1;
+ LPC_I2S->I2SDAO &= (0x00 << 6);
+ LPC_I2S->I2SDAO |= (bps << 6);
+ //set bit length
+ switch(bit){
+ case 8:
+ LPC_I2S->I2SDAO &= 0xfffffffc;
+ break;
+ case 16:
+ LPC_I2S->I2SDAO &= (0 << 1);
+ LPC_I2S->I2SDAO |= (1 << 0);
+ break;
+ case 32:
+ LPC_I2S->I2SDAO &= (0 << 1);
+ LPC_I2S->I2SDAO |= (3 << 0);
+ break;
+ default:
+ break;
+ }
+ //set audio mode
+ if(mode == STEREO){
+ LPC_I2S->I2SDAO |= (0 << 2);
+ } else {
+ LPC_I2S->I2SDAO |= (1 << 2);
+ }
+ //set transmitter and receiver setting to be the same
+ LPC_I2S->I2SDAI &= (0x00 << 6);
+ LPC_I2S->I2SDAI |= (bps << 6);
+ //set bit length
+ switch(bit){
+ case 8:
+ LPC_I2S->I2SDAI &= 0xfffffffc;
+ break;
+ case 16:
+ LPC_I2S->I2SDAI &= (0 << 1);
+ LPC_I2S->I2SDAI |= (1 << 0);
+ break;
+ case 32:
+ LPC_I2S->I2SDAI &= (0 << 1);
+ LPC_I2S->I2SDAI |= (3 << 0);
+ break;
+ default:
+ break;
+ }
+ //set audio mode
+ if(mode == STEREO){
+ LPC_I2S->I2SDAI |= (0 << 2);
+ } else {
+ LPC_I2S->I2SDAI |= (1 << 2);
+ }
+}
+/******************************************************
+ * Function name: modeConfig_()
+ *
+ * Description: Set slave mode
+ *
+ * Parameters: none
+ * Returns: none
+******************************************************/
+void I2SSlave::modeConfig_(void){
+ LPC_I2S->I2STXMODE |= (0x0 << 0);
+ LPC_I2S->I2SRXMODE |= (0x0 << 0);
+}
+/******************************************************
+ * Function name: storePins_()
+ *
+ * Description: set external pin configuration
+ *
+ * Parameters: PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws
+ * Returns: none
+******************************************************/
+void I2SSlave::storePins_(PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws){
+ tx_sda_ = tx_sda;
+ tx_ws_ = tx_ws;
+ clk_ = clk;
+ rx_sda_ = rx_sda;
+ rx_ws_ = rx_ws;
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/I2SSlave/I2SSlave.h Fri Aug 05 10:07:47 2011 +0000
@@ -0,0 +1,170 @@
+/******************************************************
+ * I2SSlave.h: I2S port abstraction library header file for NXP LPC1768
+ *
+ * Written by:
+ * mbed Team - 15th July 2011
+ * Daniel Worrall
+ *
+ * History
+ * version 1.31
+******************************************************/
+
+#include "mbed.h"
+#include "math.h"
+
+#ifndef __MBED_I2SSLAVE_H__
+#define __MBED_I2SSLAVE_H__
+
+/** I2S class defined on the LPC1768 port
+ *
+ */
+extern FunctionPointer akjnh3489v8ncv;
+class I2SSlave{
+
+ public:
+ //Constructor
+ /** Create an I2S object
+ *
+ * @param tx_sda Transmitter serial data line
+ * @param tx_ws Transmitter word select line
+ * @param clk Shared transmitter/receiver clock line
+ * @param rx_sda Receiver serial data line
+ * @param rx_ws Receiver word select line
+ */
+ I2SSlave(PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws);
+ /** Set the data transmission format
+ *
+ * @param bit Set the number of bits per write
+ * @param mode Set STEREO (0) or MONO (1) mode
+ */
+ void format(int bit, bool mode);
+ /** Write a buffer to the I2S port
+ *
+ * @param buffer Address of buffer to pass to I2S port
+ * @param from Start position in buffer to read from
+ * @param length Length of buffer (MUST not exceed 8 words, each 32 bits long)
+ *
+ * Note: sending 8 words to the TXFIFO will trigger an interrupt!
+ */
+ void write(int* buffer, int from, int length);
+ /** Activate I2S port for data streaming
+ *
+ * @param mode Mode to enable - NONE, TRANSMIT only, RECEIVE only, BOTH
+ * Enables tx/rx interrupts
+ */
+ void start(int mode);
+ /** Deactivate I2S port from data streaming
+ *
+ * Disable all interrupts
+ */
+ void stop(void);
+ /** Load receive FIFO data into receiver buffer
+ *
+ */
+ void read(void);
+ /** Attach a void/void function or void/void static memeber function to an interrupt generated by the I2SxxFIFOs
+ *
+ * @param function Function to attach
+ *
+ * e.g. myI2sObject.attach(&myfunction);
+ * OR myI2sObject.attach(&myClass::myStaticMemberFunction);
+ */
+ void attach(void(*fptr)(void)){
+ akjnh3489v8ncv.attach(fptr);
+ }
+ /** Attach a nonstatic void/void member function to an interrupt generated by the I2SxxFIFOs
+ *
+ * @param tptr Object pointer
+ * @param mptr Member function pointer
+ *
+ * e.g. myI2sObject.attach(&myObject, &myClass::myNonstaticMemberFunction); where myObject is an object of myClass
+ */
+ template<typename T>
+ void attach(T *tptr, void(T::*mptr)(void)){
+ akjnh3489v8ncv.attach(tptr, mptr);
+ }
+ /** Return contents of I2S status register
+ *
+ * @returns Content of I2SSTATE register
+ *
+ * bit0: receive/transmit interrupt active
+ * bit1: receive/transmit DMA request 1
+ * bit2: receive/transmit DMA request 2
+ * bit[11:8]: receive FIFO level
+ * bit[19:16]: transmit FIFO level
+ */
+ int status(void);
+
+ //Receiver buffer
+ int rxBuffer[4];
+ //defines
+ #define STEREO 0
+ #define MONO 1
+
+ #define I2SFIFO_EMPTY 0
+ #define I2SFIFO_FULL 8
+
+ #define RAM_LENGTH 1024
+ #define RAM_LIMIT (RAM_LENGTH - 1)
+ #define PTR_MAX ((RAM_LENGTH / 8) - 1)
+
+ #define NONE 0
+ #define TRANSMIT 1
+ #define RECEIVE 2
+ #define BOTH 3
+
+ private:
+ /** I2S intitalize function
+ *
+ * @param tx_sda Transmitter serial data line
+ * @param tx_ws Transmitter word select line
+ * @param clk Shared transmitter/receiver clock line
+ * @param rx_sda Receiver serial data line
+ * @param rx_ws Receiver word select line
+ * @return Returns 0 for successful initialisation, -1 for an error
+ */
+ int initialize_(PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws);
+ /** Set internal clock divide by rate
+ *
+ * @param divideBy Divide by 1, 2, 4 or 8
+ */
+ void setClocks_(int divideBy);
+ /** Set up the pins on the processor itself
+ *
+ * @param tx_sda Transmitter serial data line
+ * @param tx_ws Transmitter word select line
+ * @param clk Shared transmitter/receiver clock line
+ * @param rx_sda Receiver serial data line
+ * @param rx_ws Receiver word select line
+ */
+ void setPins_(PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws);
+ /** Set the data transmission format
+ *
+ * @param bit Set the number of bits per write
+ * @param mode Set STEREO (0) or MONO (1) mode
+ */
+ void format_(int bit, bool mode);
+ /** Set slave mode
+ *
+ */
+ void modeConfig_(void);
+ /** Store PinName values
+ *
+ * @param tx_sda Transmitter serial data line
+ * @param tx_ws Transmitter word select line
+ * @param clk Shared transmitter/receiver clock line
+ * @param rx_sda Receiver serial data line
+ * @param rx_ws Receiver word select line
+ */
+ void storePins_(PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws);
+ //variables
+ int bit_;
+ bool mode_;
+ PinName tx_sda_;
+ PinName tx_ws_;
+ PinName clk_;
+ PinName rx_sda_;
+ PinName rx_ws_;
+};
+
+#endif /*__MBED_I2S_H__*/
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/SDHCFileSystem/SDHCFileSystem.cpp Fri Aug 05 10:07:47 2011 +0000
@@ -0,0 +1,495 @@
+/* mbed SDFileSystem Library, for providing file access to SD cards
+ * Copyright (c) 2008-2010, sford
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/* Introduction
+ * ------------
+ * SD and MMC cards support a number of interfaces, but common to them all
+ * is one based on SPI. This is the one I'm implmenting because it means
+ * it is much more portable even though not so performant, and we already
+ * have the mbed SPI Interface!
+ *
+ * The main reference I'm using is Chapter 7, "SPI Mode" of:
+ * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
+ *
+ * SPI Startup
+ * -----------
+ * The SD card powers up in SD mode. The SPI interface mode is selected by
+ * asserting CS low and sending the reset command (CMD0). The card will
+ * respond with a (R1) response.
+ *
+ * CMD8 is optionally sent to determine the voltage range supported, and
+ * indirectly determine whether it is a version 1.x SD/non-SD card or
+ * version 2.x. I'll just ignore this for now.
+ *
+ * ACMD41 is repeatedly issued to initialise the card, until "in idle"
+ * (bit 0) of the R1 response goes to '0', indicating it is initialised.
+ *
+ * You should also indicate whether the host supports High Capicity cards,
+ * and check whether the card is high capacity - i'll also ignore this
+ *
+ * SPI Protocol
+ * ------------
+ * The SD SPI protocol is based on transactions made up of 8-bit words, with
+ * the host starting every bus transaction by asserting the CS signal low. The
+ * card always responds to commands, data blocks and errors.
+ *
+ * The protocol supports a CRC, but by default it is off (except for the
+ * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
+ * I'll leave the CRC off I think!
+ *
+ * Standard capacity cards have variable data block sizes, whereas High
+ * Capacity cards fix the size of data block to 512 bytes. I'll therefore
+ * just always use the Standard Capacity cards with a block size of 512 bytes.
+ * This is set with CMD16.
+ *
+ * You can read and write single blocks (CMD17, CMD25) or multiple blocks
+ * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
+ * the card gets a read command, it responds with a response token, and then
+ * a data token or an error.
+ *
+ * SPI Command Format
+ * ------------------
+ * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
+ *
+ * +---------------+------------+------------+-----------+----------+--------------+
+ * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
+ * +---------------+------------+------------+-----------+----------+--------------+
+ *
+ * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
+ *
+ * All Application Specific commands shall be preceded with APP_CMD (CMD55).
+ *
+ * SPI Response Format
+ * -------------------
+ * The main response format (R1) is a status byte (normally zero). Key flags:
+ * idle - 1 if the card is in an idle state/initialising
+ * cmd - 1 if an illegal command code was detected
+ *
+ * +-------------------------------------------------+
+ * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
+ * +-------------------------------------------------+
+ *
+ * R1b is the same, except it is followed by a busy signal (zeros) until
+ * the first non-zero byte when it is ready again.
+ *
+ * Data Response Token
+ * -------------------
+ * Every data block written to the card is acknowledged by a byte
+ * response token
+ *
+ * +----------------------+
+ * | xxx | 0 | status | 1 |
+ * +----------------------+
+ * 010 - OK!
+ * 101 - CRC Error
+ * 110 - Write Error
+ *
+ * Single Block Read and Write
+ * ---------------------------
+ *
+ * Block transfers have a byte header, followed by the data, followed
+ * by a 16-bit CRC. In our case, the data will always be 512 bytes.
+ *
+ * +------+---------+---------+- - - -+---------+-----------+----------+
+ * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
+ * +------+---------+---------+- - - -+---------+-----------+----------+
+ */
+
+ /*
+ * Comment: Changes for SDHC support till 32GB
+ * Name: KB
+ * Date: 07/24/2010
+ * Release: 0.1
+ */
+
+#include "SDHCFileSystem.h"
+
+#define DEBUG
+#define SD_COMMAND_TIMEOUT 5000
+
+
+SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
+ FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
+ _cs = 1;
+}
+
+#define R1_IDLE_STATE (1 << 0)
+#define R1_ERASE_RESET (1 << 1)
+#define R1_ILLEGAL_COMMAND (1 << 2)
+#define R1_COM_CRC_ERROR (1 << 3)
+#define R1_ERASE_SEQUENCE_ERROR (1 << 4)
+#define R1_ADDRESS_ERROR (1 << 5)
+#define R1_PARAMETER_ERROR (1 << 6)
+
+// Types
+// - v1.x Standard Capacity
+// - v2.x Standard Capacity
+// - v2.x High Capacity
+// - Not recognised as an SD Card
+
+#define SDCARD_FAIL 0
+#define SDCARD_V1 1
+#define SDCARD_V2 2
+#define SDCARD_V2HC 3
+
+int SDFileSystem::initialise_card() {
+ // Set to 100kHz for initialisation, and clock card with cs = 1
+ _spi.frequency(100000);
+ _cs = 1;
+ for(int i=0; i<16; i++) {
+ _spi.write(0xFF);
+ }
+
+ // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
+ if(_cmd(0, 0) != R1_IDLE_STATE) {
+ fprintf(stderr, "No disk, or could not put SD card in to SPI idle state\n");
+ return SDCARD_FAIL;
+ }
+
+ // send CMD8 to determine whther it is ver 2.x
+ int r = _cmd8();
+ if(r == R1_IDLE_STATE) {
+ return initialise_card_v2();
+ } else if(r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
+ return initialise_card_v1();
+ } else {
+ fprintf(stderr, "Not in idle state after sending CMD8 (not an SD card?)\n");
+ return SDCARD_FAIL;
+ }
+}
+
+int SDFileSystem::initialise_card_v1() {
+ for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
+ _cmd(55, 0);
+ if(_cmd(41, 0) == 0) {
+ cdv = 512;
+ #ifdef DEBUG
+ printf("\n\rInit: SEDCARD_V1\n\r");
+ #endif
+ return SDCARD_V1;
+ }
+ }
+
+ fprintf(stderr, "Timeout waiting for v1.x card\n");
+ return SDCARD_FAIL;
+}
+
+int SDFileSystem::initialise_card_v2() {
+
+ for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
+ wait_ms(50);
+ _cmd58();
+ _cmd(55, 0);
+ if(_cmd(41, 0x40000000) == 0) {
+ _cmd58();
+ #ifdef DEBUG
+ printf("\n\rInit: SDCARD_V2\n\r");
+ #endif
+ cdv = 1;
+ return SDCARD_V2;
+ }
+ }
+
+ fprintf(stderr, "Timeout waiting for v2.x card\n");
+ return SDCARD_FAIL;
+}
+
+int SDFileSystem::disk_initialize() {
+
+ int i = initialise_card();
+ #ifdef DEBUG
+ printf("init card = %d\n", i);
+ #endif
+ _sectors = _sd_sectors();
+
+ // Set block length to 512 (CMD16)
+ if(_cmd(16, 512) != 0) {
+ fprintf(stderr, "Set 512-byte block timed out\n");
+ return 1;
+ }
+
+ _spi.frequency(20000000); // Set to 1MHz for data transfer
+ return 0;
+}
+
+int SDFileSystem::disk_write(const char *buffer, int block_number) {
+ // set write address for single block (CMD24)
+ if(_cmd(24, block_number * cdv) != 0) {
+ return 1;
+ }
+
+ // send the data block
+ _write(buffer, 512);
+ return 0;
+}
+
+int SDFileSystem::disk_read(char *buffer, int block_number) {
+ // set read address for single block (CMD17)
+ if(_cmd(17, block_number * cdv) != 0) {
+ return 1;
+ }
+
+ // receive the data
+ _read(buffer, 512);
+ return 0;
+}
+
+int SDFileSystem::disk_status() { return 0; }
+int SDFileSystem::disk_sync() { return 0; }
+int SDFileSystem::disk_sectors() { return _sectors; }
+
+// PRIVATE FUNCTIONS
+
+int SDFileSystem::_cmd(int cmd, int arg) {
+ _cs = 0;
+
+ // send a command
+ _spi.write(0x40 | cmd);
+ _spi.write(arg >> 24);
+ _spi.write(arg >> 16);
+ _spi.write(arg >> 8);
+ _spi.write(arg >> 0);
+ _spi.write(0x95);
+
+ // wait for the repsonse (response[7] == 0)
+ for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
+ int response = _spi.write(0xFF);
+ if(!(response & 0x80)) {
+ _cs = 1;
+ _spi.write(0xFF);
+ return response;
+ }
+ }
+ _cs = 1;
+ _spi.write(0xFF);
+ return -1; // timeout
+}
+int SDFileSystem::_cmdx(int cmd, int arg) {
+ _cs = 0;
+
+ // send a command
+ _spi.write(0x40 | cmd);
+ _spi.write(arg >> 24);
+ _spi.write(arg >> 16);
+ _spi.write(arg >> 8);
+ _spi.write(arg >> 0);
+ _spi.write(0x95);
+
+ // wait for the repsonse (response[7] == 0)
+ for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
+ int response = _spi.write(0xFF);
+ if(!(response & 0x80)) {
+ return response;
+ }
+ }
+ _cs = 1;
+ _spi.write(0xFF);
+ return -1; // timeout
+}
+
+
+int SDFileSystem::_cmd58() {
+ _cs = 0;
+ int arg = 0;
+
+ // send a command
+ _spi.write(0x40 | 58);
+ _spi.write(arg >> 24);
+ _spi.write(arg >> 16);
+ _spi.write(arg >> 8);
+ _spi.write(arg >> 0);
+ _spi.write(0x95);
+
+ // wait for the repsonse (response[7] == 0)
+ for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
+ int response = _spi.write(0xFF);
+ if(!(response & 0x80)) {
+ int ocr = _spi.write(0xFF) << 24;
+ ocr |= _spi.write(0xFF) << 16;
+ ocr |= _spi.write(0xFF) << 8;
+ ocr |= _spi.write(0xFF) << 0;
+// printf("OCR = 0x%08X\n", ocr);
+ _cs = 1;
+ _spi.write(0xFF);
+ return response;
+ }
+ }
+ _cs = 1;
+ _spi.write(0xFF);
+ return -1; // timeout
+}
+
+int SDFileSystem::_cmd8() {
+ _cs = 0;
+
+ // send a command
+ _spi.write(0x40 | 8); // CMD8
+ _spi.write(0x00); // reserved
+ _spi.write(0x00); // reserved
+ _spi.write(0x01); // 3.3v
+ _spi.write(0xAA); // check pattern
+ _spi.write(0x87); // crc
+
+ // wait for the repsonse (response[7] == 0)
+ for(int i=0; i<SD_COMMAND_TIMEOUT * 1000; i++) {
+ char response[5];
+ response[0] = _spi.write(0xFF);
+ if(!(response[0] & 0x80)) {
+ for(int j=1; j<5; j++) {
+ response[i] = _spi.write(0xFF);
+ }
+ _cs = 1;
+ _spi.write(0xFF);
+ return response[0];
+ }
+ }
+ _cs = 1;
+ _spi.write(0xFF);
+ return -1; // timeout
+}
+
+int SDFileSystem::_read(char *buffer, int length) {
+ _cs = 0;
+
+ // read until start byte (0xFF)
+ while(_spi.write(0xFF) != 0xFE);
+
+ // read data
+ for(int i=0; i<length; i++) {
+ buffer[i] = _spi.write(0xFF);
+ }
+ _spi.write(0xFF); // checksum
+ _spi.write(0xFF);
+
+ _cs = 1;
+ _spi.write(0xFF);
+ return 0;
+}
+
+int SDFileSystem::_write(const char *buffer, int length) {
+ _cs = 0;
+
+ // indicate start of block
+ _spi.write(0xFE);
+
+ // write the data
+ for(int i=0; i<length; i++) {
+ _spi.write(buffer[i]);
+ }
+
+ // write the checksum
+ _spi.write(0xFF);
+ _spi.write(0xFF);
+
+ // check the repsonse token
+ if((_spi.write(0xFF) & 0x1F) != 0x05) {
+ _cs = 1;
+ _spi.write(0xFF);
+ return 1;
+ }
+
+ // wait for write to finish
+ while(_spi.write(0xFF) == 0);
+
+ _cs = 1;
+ _spi.write(0xFF);
+ return 0;
+}
+
+static int ext_bits(char *data, int msb, int lsb) {
+ int bits = 0;
+ int size = 1 + msb - lsb;
+ for(int i=0; i<size; i++) {
+ int position = lsb + i;
+ int byte = 15 - (position >> 3);
+ int bit = position & 0x7;
+ int value = (data[byte] >> bit) & 1;
+ bits |= value << i;
+ }
+ return bits;
+}
+
+int SDFileSystem::_sd_sectors() {
+
+ int c_size, c_size_mult, read_bl_len;
+ int block_len, mult, blocknr, capacity;
+ int blocks, hc_c_size;
+ uint64_t hc_capacity;
+
+ // CMD9, Response R2 (R1 byte + 16-byte block read)
+ if(_cmdx(9, 0) != 0) {
+ fprintf(stderr, "Didn't get a response from the disk\n");
+ return 0;
+ }
+
+ char csd[16];
+ if(_read(csd, 16) != 0) {
+ fprintf(stderr, "Couldn't read csd response from disk\n");
+ return 0;
+ }
+
+ // csd_structure : csd[127:126]
+ // c_size : csd[73:62]
+ // c_size_mult : csd[49:47]
+ // read_bl_len : csd[83:80] - the *maximum* read block length
+
+ int csd_structure = ext_bits(csd, 127, 126);
+
+ #ifdef DEBUG
+ printf("\n\rCSD_STRUCT = %d\n", csd_structure);
+ #endif
+
+ switch (csd_structure){
+ case 0:
+ cdv = 512;
+ c_size = ext_bits(csd, 73, 62);
+ c_size_mult = ext_bits(csd, 49, 47);
+ read_bl_len = ext_bits(csd, 83, 80);
+
+ block_len = 1 << read_bl_len;
+ mult = 1 << (c_size_mult + 2);
+ blocknr = (c_size + 1) * mult;
+ capacity = blocknr * block_len;
+ blocks = capacity / 512;
+ #ifdef DEBUG
+ printf("\n\rSDCard\n\rc_size: %.4X \n\rcapacity: %.ld \n\rsectors: %d\r\n", c_size, capacity, blocks);
+ #endif
+ break;
+
+ case 1:
+ cdv = 1;
+ hc_c_size = ext_bits(csd, 63, 48);
+ int hc_read_bl_len = ext_bits(csd, 83, 80);
+ hc_capacity = hc_c_size+1;
+ blocks = (hc_c_size+1)*1024;
+ #ifdef DEBUG
+ printf("\n\rSDHC Card \n\rhc_c_size: %.4X \n\rcapacity: %.lld \n\rsectors: %d\r\n", hc_c_size, hc_capacity*512*1024, blocks);
+ #endif
+ break;
+
+ default:
+ fprintf(stderr, "This disk tastes funny! I only know about type 0 CSD structures\n");
+ return 0;
+ //break;
+ };
+ return blocks;
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/SDHCFileSystem/SDHCFileSystem.h Fri Aug 05 10:07:47 2011 +0000
@@ -0,0 +1,86 @@
+/* mbed SDFileSystem Library, for providing file access to SD cards
+ * Copyright (c) 2008-2010, sford
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MBED_SDHCFILESYSTEM_H
+#define MBED_SDHCFILESYSTEM_H
+
+#include "mbed.h"
+#include "FATFileSystem.h"
+
+/* Double Words */
+typedef unsigned long long uint64_t;
+typedef long long sint64_t;
+
+/** Access the filesystem on an SD Card using SPI
+ *
+ * @code
+ * #include "mbed.h"
+ * #include "SDFileSystem.h"
+ *
+ * SDFileSystem sd(p5, p6, p7, p12, "sd"); // mosi, miso, sclk, cs
+ *
+ * int main() {
+ * FILE *fp = fopen("/sd/myfile.txt", "w");
+ * fprintf(fp, "Hello World!\n");
+ * fclose(fp);
+ * }
+ */
+class SDFileSystem : public FATFileSystem {
+public:
+
+ /** Create the File System for accessing an SD Card using SPI
+ *
+ * @param mosi SPI mosi pin connected to SD Card
+ * @param miso SPI miso pin conencted to SD Card
+ * @param sclk SPI sclk pin connected to SD Card
+ * @param cs DigitalOut pin used as SD Card chip select
+ * @param name The name used to access the virtual filesystem
+ */
+ SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name);
+ virtual int disk_initialize();
+ virtual int disk_write(const char *buffer, int block_number);
+ virtual int disk_read(char *buffer, int block_number);
+ virtual int disk_status();
+ virtual int disk_sync();
+ virtual int disk_sectors();
+
+protected:
+
+ int _cmd(int cmd, int arg);
+ int _cmdx(int cmd, int arg);
+ int _cmd8();
+ int _cmd58();
+ int initialise_card();
+ int initialise_card_v1();
+ int initialise_card_v2();
+
+ int _read(char *buffer, int length);
+ int _write(const char *buffer, int length);
+ int _sd_sectors();
+ int _sectors;
+
+ SPI _spi;
+ DigitalOut _cs;
+ int cdv;
+};
+
+#endif
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/TLV320/TLV320.cpp Fri Aug 05 10:07:47 2011 +0000
@@ -0,0 +1,344 @@
+ /******************************************************
+ * TLV320.cpp: Texas instruments TLV320AIC23B library NXP LPC1768
+ *
+ * Written by:
+ * mbed Team
+ * Ioannis Kedros - 10th January 2011
+ * (basic functionality incurred)
+ * Daniel Worrall - 15th July 2011
+ * (I2SSlave implementation and API restructuring)
+ *
+ * History
+ * version 2.29
+******************************************************/
+#include "mbed.h"
+#include "TLV320.h"
+
+TLV320::TLV320(PinName sda, PinName scl, int addr, PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws)
+ : mAddr(addr), mI2c_(sda, scl), mI2s_(tx_sda, tx_ws, clk, rx_sda, rx_ws){
+ mI2c_.frequency(150000);
+ reset(); //TLV resets
+ power(0x07); //Power Up the TLV320, but not the MIC, ADC and LINE
+ format(16, STEREO); //16Bit I2S protocol format, STEREO
+ frequency(44100); //Default sample frequency is 44.1kHz
+ bypass(false); //Do not bypass device
+ mute(false); //Not muted
+ activateDigitalInterface_(); //The digital part of the chip is active
+ outputVolume(0.6, 0.6); //Headphone volume to the default state
+ rxBuffer = &mI2s_.rxBuffer[0];
+}
+//Public Functions
+/******************************************************
+ * Function name: inputVolume()
+ *
+ * Description: set line in volume for left and right channels
+ *
+ * Parameters: float leftVolumeIn, float rightVolumeIn
+ * Returns: int 0 (success), -1 (value out of range)
+******************************************************/
+int TLV320::inputVolume(float leftVolumeIn, float rightVolumeIn){
+ //check values are in range
+ if((leftVolumeIn < 0.0)||leftVolumeIn > 1.0) return -1;
+ if((rightVolumeIn < 0.0)||rightVolumeIn > 1.0) return -1;
+ //convert float to encoded char
+ char left = (char)31*leftVolumeIn;
+ char right = (char)31*rightVolumeIn;
+ //Left Channel
+ cmd[1] = left | (0 << 7); //set volume
+ cmd[0] = LEFT_LINE_INPUT_CHANNEL_VOLUME_CONTROL; //set address
+ mI2c_.write(mAddr, cmd, 2); //send
+ //Right Channel
+ cmd[1] = right | (0 << 7); //set volume
+ cmd[0] = RIGHT_LINE_INPUT_CHANNEL_VOLUME_CONTROL; //set address
+ mI2c_.write(mAddr, cmd, 2); //send
+ return 0;
+}
+/******************************************************
+ * Function name: outputVolume()
+ *
+ * Description: Set headphone (line out) volume for left an right channels
+ *
+ * Parameters: float leftVolumeOut, float rightVolumeOut
+ * Returns: int 0 (success), -1 (value out of range)
+******************************************************/
+int TLV320::outputVolume(float leftVolumeOut, float rightVolumeOut){
+ //check values are in range
+ if((leftVolumeOut < 0.0)||leftVolumeOut > 1.0) return -1;
+ if((rightVolumeOut < 0.0)||rightVolumeOut > 1.0) return -1;
+ //convert float to encoded char
+ char left = (char)(79*leftVolumeOut)+0x30;
+ char right = (char)(79*rightVolumeOut)+0x30;
+ //Left Channel
+ cmd[1] = left | (1 << 7); //set volume
+ cmd[0] = LEFT_CHANNEL_HEADPHONE_VOLUME_CONTROL; //set address
+ mI2c_.write(mAddr, cmd, 2); //send
+ //Right Channel
+ cmd[1] = right | (1 << 7); //set volume
+ cmd[0] = RIGHT_CHANNEL_HEADPHONE_VOLUME_CONTROL; //set address
+ mI2c_.write(mAddr, cmd, 2); //send
+ return 0;
+}
+/******************************************************
+ * Function name: bypass()
+ *
+ * Description: Send TLV320 into bypass mode, i.e. connect input to output
+ *
+ * Parameters: bool bypassVar
+ * Returns: none
+******************************************************/
+void TLV320::bypass(bool bypassVar){
+ if(bypassVar == true)
+ cmd[1] = (1 << 3) | (0 << 4) | (0 << 5);//bypass enabled, DAC disabled, sidetone insertion disabled
+ else
+ cmd[1] = (0 << 3) | (1 << 4); //bypass disabled, DAC enabled
+ cmd[1] |= (0 << 2);
+ cmd[0] = ANALOG_AUDIO_PATH_CONTROL; //set address
+ mI2c_.write(mAddr, cmd, 2); //send
+}
+/******************************************************
+ * Function name: mute()
+ *
+ * Description: Send TLV320 into mute mode
+ *
+ * Parameters: bool softMute
+ * Returns: none
+******************************************************/
+void TLV320::mute(bool softMute){
+ if(softMute == true) cmd[1] = 0x08; //set instruction to mute
+ else cmd[1] = 0x00; //set instruction to NOT mute
+
+ cmd[0] = DIGITAL_AUDIO_PATH_CONTROL; //set address
+ mI2c_.write(mAddr, cmd, 2); //send
+}
+/******************************************************
+ * Function name: power()
+ *
+ * Description: Switch TLV320 on/off
+ *
+ * Parameters: bool powerUp
+ * Returns: none
+******************************************************/
+void TLV320::power(bool powerUp){
+ if(powerUp == true) cmd[1] = 0x00; //everything on
+ else cmd[1] = 0xFF; //everything off
+
+ cmd[0] = POWER_DOWN_CONTROL; //set address
+ mI2c_.write(mAddr, cmd, 2); //send
+}
+/******************************************************
+ * Function name: power()
+ *
+ * Description: Switch on individual devices on TLV320
+ *
+ * Parameters: int device
+ * Returns: none
+******************************************************/
+void TLV320::power(int device){
+ cmd[1] = (char)device; //set user defined commands
+ cmd[0] = POWER_DOWN_CONTROL; //set address
+ mI2c_.write(mAddr, cmd, 2); //send
+}
+/******************************************************
+ * Function name: format()
+ *
+ * Description: Set interface format
+ *
+ * Parameters: char length, bool mode
+ * Returns: none
+******************************************************/
+void TLV320::format(char length, bool mode){
+ char modeSet = (1 << 6);
+ modeSet |= (1 << 5); //swap left and right channels
+
+ switch (length) //input data into instruction byte
+ {
+ case 16:
+ cmd[1] = modeSet | 0x02;
+ break;
+ case 20:
+ cmd[1] = modeSet | 0x06;
+ break;
+ case 24:
+ cmd[1] = modeSet | 0x0A;
+ break;
+ case 32:
+ cmd[1] = modeSet | 0x0E;
+ break;
+ default:
+ break;
+ }
+ mI2s_.format(length, mode);
+ cmd[0] = DIGITAL_AUDIO_INTERFACE_FORMAT; //set address
+ mI2c_.write(mAddr, cmd, 2); //send
+}
+/******************************************************
+ * Function name: frequency()
+ *
+ * Description: Set sample frequency
+ *
+ * Parameters: int hz
+ * Returns: int 0 (success), -1 (value not recognised)
+******************************************************/
+int TLV320::frequency(int hz){
+ char rate;
+ switch(hz){
+ case 8000:
+ rate = 0x03;
+ break;
+ case 8021:
+ rate = 0x0B;
+ break;
+ case 32000:
+ rate = 0x06;
+ break;
+ case 44100:
+ rate = 0x08;
+ break;
+ case 48000:
+ rate = 0x00;
+ break;
+ case 88200:
+ rate = 0x0F;
+ break;
+ case 96000:
+ rate = 0x07;
+ break;
+ default:
+ return -1;
+ }
+ char clockInChar = (0 << 6);
+ char clockModeChar = (1 << 0);
+
+ cmd[1] = (rate << 2) | clockInChar | clockModeChar; //input data into instruciton byte
+ cmd[0] = SAMPLE_RATE_CONTROL; //set address
+ mI2c_.write(mAddr, cmd, 2); //send
+ return 0;
+}
+/******************************************************
+ * Function name: reset()
+ *
+ * Description: Reset TLV320
+ *
+ * Parameters: none
+ * Returns: none
+******************************************************/
+void TLV320::reset(void){
+ cmd[0] = RESET_REGISTER; //set address
+ cmd[1] = 0x00; //this resets the entire device
+ mI2c_.write(mAddr, cmd, 2);
+}
+/******************************************************
+ * Function name: start()
+ *
+ * Description: Enable interrupts on the I2S port
+ *
+ * Parameters: int mode
+ * Returns: none
+******************************************************/
+void TLV320::start(int mode){
+ mI2s_.start(mode);
+}
+/******************************************************
+ * Function name: stop()
+ *
+ * Description: Disable interrupts on the I2S port
+ *
+ * Parameters: none
+ * Returns: none
+******************************************************/
+void TLV320::stop(void){
+ mI2s_.stop();
+}
+/******************************************************
+ * Function name: write()
+ *
+ * Description: Write (part of) a buffer to the I2S port
+ *
+ * Parameters: int *buffer, int from, int length
+ * Returns: none
+******************************************************/
+void TLV320::write(int *buffer, int from, int length){
+ mI2s_.write(buffer, from, length);
+}
+/******************************************************
+ * Function name: read()
+ *
+ * Description: Place I2SRXFIFO in rxBuffer
+ *
+ * Parameters: none
+ * Returns: none
+******************************************************/
+void TLV320::read(void){
+ mI2s_.read();
+}
+/******************************************************
+ * Function name: attach()
+ *
+ * Description: Attach a void/void function or void/void static member function to IRQHandler
+ *
+ * Parameters: none
+ * Returns: none
+******************************************************/
+void TLV320::attach(void(*fptr)(void)){
+ mI2s_.attach(fptr);
+}
+//Private Functions
+/******************************************************
+ * Function name: setSampleRate_()
+ *
+ * Description: Clocking control
+ *
+ * Parameters: char rate, bool clockIn, bool clockMode, bool bOSR
+ * Returns: none
+******************************************************/
+void TLV320::setSampleRate_(char rate, bool clockIn, bool clockMode, bool bOSR){
+ char clockInChar;
+ char clockModeChar;
+ char baseOverSamplingRate;
+ if(bOSR){
+ baseOverSamplingRate = (1 << 0);
+ } else {
+ baseOverSamplingRate = (0 << 0);
+ }
+ if(clockIn){
+ clockInChar = (1 << 6);
+ } else {
+ clockInChar = (0 << 6);
+ }
+ if(clockMode){
+ clockModeChar = 0x01;
+ } else {
+ clockModeChar = 0x00;
+ }
+ cmd[1] = (rate << 2) | clockInChar | clockModeChar | baseOverSamplingRate; //input data into instruciton byte
+ cmd[0] = SAMPLE_RATE_CONTROL; //set address
+ mI2c_.write(mAddr, cmd, 2); //send
+}
+/******************************************************
+ * Function name: activateDigitalInterface_()
+ *
+ * Description: Activate digital part of chip
+ *
+ * Parameters: none
+ * Returns: none
+******************************************************/
+void TLV320::activateDigitalInterface_(void){
+ cmd[1] = 0x01; //Activate
+ cmd[0] = DIGITAL_INTERFACE_ACTIVATION; //set address
+ mI2c_.write(mAddr, cmd, 2); //send
+}
+/******************************************************
+ * Function name: deactivateDigitalInterface_
+ *
+ * Description: Deactivate digital part of chip
+ *
+ * Parameters: none
+ * Returns: none
+******************************************************/
+//Digital interface deactivation
+void TLV320::deactivateDigitalInterface_(void){
+ cmd[1] = 0x00; //Deactivate
+ cmd[0] = DIGITAL_INTERFACE_ACTIVATION; //set address
+ mI2c_.write(mAddr, cmd, 2); //send
+}
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/TLV320/TLV320.h Fri Aug 05 10:07:47 2011 +0000
@@ -0,0 +1,187 @@
+ /******************************************************
+ * TLV320.h: Texas instruments TLV320AIC23B library NXP LPC1768
+ *
+ * Written by:
+ * mbed Team
+ * Ioannis Kedros - 10th January 2011
+ * (basic functionality incurred)
+ * Daniel Worrall - 15th July 2011
+ * (I2SSlave implementation and API restructuring)
+ *
+ * History
+ * version 2.29
+******************************************************/
+
+#ifndef MBED_TLV320_H
+#define MBED_TLV320_H
+
+#include "mbed.h"
+#include "I2SSlave.h"
+
+/** TLV320 class, defined on the I2C master bus
+*
+*/
+
+class TLV320
+{
+ public:
+ //constructor
+ /** Create a TLV320 object defined on the I2C port
+ *
+ * @param sda Serial data pin (p9 or p28)
+ * @param scl Serial clock pin (p10 or p27)
+ * @param addr Object address
+ */
+ TLV320(PinName sda, PinName scl, int addr, PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws);
+ /** Power up/down
+ *
+ * @param powerUp 0 = power down, 1 = power up
+ */
+ void power(bool powerUp);
+ /** Overloaded power() function
+ *
+ * @param device Call individual devices to power up/down
+ * Device power 0x00 = On 0x80 = Off
+ * Clock 0x00 = On 0x40 = Off
+ * Oscillator 0x00 = On 0x20 = Off
+ * Outputs 0x00 = On 0x10 = Off
+ * DAC 0x00 = On 0x08 = Off
+ * ADC 0x00 = On 0x04 = Off
+ * Microphone input 0x00 = On 0x02 = Off
+ * Line input 0x00 = On 0x01 = Off
+ */
+ void power(int device);
+ /** Set I2S interface bit length and mode
+ *
+ * @param length Set bit length to 16, 20, 24 or 32 bits
+ * @param mode Set STEREO (0), MONO (1)
+ */
+ void format(char length, bool mode);
+ /** Set sample frequency
+ *
+ * @param frequency Sample frequency of data in Hz
+ * @return Returns an integer 0 = success, -1 = unrecognnised frequency
+ *
+ * The TLV320 supports the following frequencies: 8kHz, 8.021kHz, 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz
+ * Default is 44.1kHz
+ */
+ int frequency(int hz);
+ /** Reset TLV320
+ *
+ */
+ void reset(void);
+ /** Start streaming i.e. enable interrupts
+ *
+ * @param mode Enable interrupts for NONE, TRANSMIT only, RECEIVE only, BOTH
+ */
+ void start(int mode);
+ /** Stop streaming i.e. disable all interrupts
+ *
+ */
+ void stop(void);
+ /** Write [length] 32 bit words in buffer to I2S port
+ *
+ * @param *buffer Address of buffer to be written
+ * @param from Start position in buffer to read from
+ * @param length Number of words to be written (MUST not exceed 4)
+ */
+ void write(int *buffer, int from, int length);
+ /** Read 4 x (32bit) words into rxBuffer
+ *
+ */
+ void read(void);
+ /** Attach a void/void function or void/void static member funciton to an interrupt generated by the I2SxxFIFOs
+ *
+ * @param function Function to attach
+ *
+ * e.g. myTlv320Object.attach(&myfunction);
+ * OR myTlv320Object.attach(&myClass::myStaticMemberFunction);
+ */
+ void attach(void(*fptr)(void));
+ /** Attach a nonstatic void/void member function to an interrupt generated by the I2SxxFIFOs
+ *
+ * @param tptr Object pointer
+ * @param mptr Member function pointer
+ *
+ * e.g. myTlv320Object.attach(&myObject, &myClass::myNonstaticMemberFunction); where myObject is an object of myClass
+ */
+ template<typename T>
+ void attach(T *tptr, void(T::*mptr)(void)){
+ mI2s_.attach(tptr, mptr);
+ }
+ /** Line in volume control i.e. record volume
+ *
+ * @param leftVolumeIn Left line-in volume
+ * @param rightVolumeIn Right line-in volume
+ * @return Returns 0 for success, -1 if parameters are out of range
+ * Parameters accept a value, where 0.0 < parameter < 1.0 and where 0.0 maps to -34.5dB
+ * and 1.0 maps to +12dB (0.74 = 0 dB default).
+ */
+ int inputVolume(float leftVolumeIn, float rightVolumeIn);
+ /** Headphone out volume control
+ *
+ * @param leftVolumeOut Left line-out volume
+ * @param rightVolumeOut Right line-out volume
+ * @return Returns 0 for success, -1 if parameters are out of range
+ * Parameters accept a value, where 0.0 < parameter < 1.0 and where 0.0 maps to -73dB (mute)
+ * and 1.0 maps to +6dB (0.5 = default)
+ */
+ int outputVolume(float leftVolumeOut, float rightVolumeOut);
+ /** Analog audio path control
+ *
+ * @param bypassVar Route analogue audio direct from line in to headphone out
+ */
+ void bypass(bool bypassVar);
+ /**Digital audio path control
+ *
+ * @param softMute Mute output
+ */
+ void mute(bool softMute);
+ //Receive buffer
+
+ int *rxBuffer;
+
+ protected:
+ char cmd[2]; //the address and command for TLV320 internal registers
+ int mAddr; //register write address
+ private:
+ I2C mI2c_; //MUST use the I2C port
+ I2SSlave mI2s_;
+ Ticker I2sTick;
+ void io(void);
+ /** Sample rate control
+ *
+ * @param rate Set the sampling rate as per datasheet section 3.3.2
+ * @param clockIn Set the clock in divider MCLK, MCLK_DIV2
+ * @param clockMode Set clock mode CLOCK_NORMAL, CLOCK_USB
+ */
+ void setSampleRate_(char rate, bool clockIn, bool mode, bool bOSR);
+ /** Digital interface activation
+ *
+ */
+ void activateDigitalInterface_(void);
+ /** Digital interface deactivation
+ *
+ */
+ void deactivateDigitalInterface_(void);
+
+ //TLV320AIC23B register addresses as defined in the TLV320AIC23B datasheet
+ #define LEFT_LINE_INPUT_CHANNEL_VOLUME_CONTROL (0x00 << 1)
+ #define RIGHT_LINE_INPUT_CHANNEL_VOLUME_CONTROL (0x01 << 1)
+ #define LEFT_CHANNEL_HEADPHONE_VOLUME_CONTROL (0x02 << 1)
+ #define RIGHT_CHANNEL_HEADPHONE_VOLUME_CONTROL (0x03 << 1)
+ #define ANALOG_AUDIO_PATH_CONTROL (0x04 << 1)
+ #define DIGITAL_AUDIO_PATH_CONTROL (0x05 << 1)
+ #define POWER_DOWN_CONTROL (0x06 << 1)
+ #define DIGITAL_AUDIO_INTERFACE_FORMAT (0x07 << 1)
+ #define SAMPLE_RATE_CONTROL (0x08 << 1)
+ #define DIGITAL_INTERFACE_ACTIVATION (0x09 << 1)
+ #define RESET_REGISTER (0x0F << 1)
+
+ #define CLOCK_NORMAL 0
+ #define CLOCK_USB 1
+ #define MCLK 0
+ #define MCLK_DIV2 1
+};
+
+#endif
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Aug 05 10:07:47 2011 +0000
@@ -0,0 +1,68 @@
+#include "mbed.h"
+#include "SDHCFileSystem.h"
+#include "TLV320.h"
+
+TLV320 audio(p9, p10, 52, p5, p6, p7, p8, p29); //TLV320 object
+SDFileSystem sd(p11, p12, p13, p14, "sd"); //SD Card object
+InterruptIn volumeSet(p17);
+AnalogIn aIn(p19);
+FILE *infp; //File pointer object
+/* Buffers */
+int circularBuffer[4096];
+volatile int readPointer = 0;
+volatile int theta = 0;
+/* Wav file header data, for setting up the transfer protocol */
+short channels;
+long sampleRate;
+short wordWidth;
+/* Function to set volume*/
+void setVolume(void){
+ audio.outputVolume(aIn, aIn);
+}
+/* Function to read from circular buffer and send data to TLV320 */
+void play(void){
+ audio.write(circularBuffer, readPointer, 8);
+ //Pointer fun :-)
+ readPointer += 8;
+ readPointer &= 0xfff;
+ theta -= 8;
+}
+/* Function to load circular buffer from SD Card */
+void fillBuffer(void){
+ while(!feof(infp)){ //fill the circular buffer until the end of the file
+ static volatile int writePointer = 0;
+ if(theta < 4096){
+ fread(&circularBuffer[writePointer], 4, 4, infp); //read 4 integers into the circular buffer at a time
+ //More pointer fun :D
+ theta+=4;
+ writePointer+=4;
+ writePointer &= 0xfff;
+ }
+ }
+}
+/* main */
+int main(){
+ infp = fopen("/sd/test.wav", "r"); //open file
+ if(infp == NULL){ //make sure it's been opened
+ perror("Error opening file!");
+ exit(1);
+ }
+ /* Parse wav file header */
+ fseek(infp, 22, SEEK_SET);
+ fread(&channels, 2, 1, infp);
+ fseek(infp, 24, SEEK_SET);
+ fread(&sampleRate, 4, 1, infp);
+ fseek(infp, 34, SEEK_SET);
+ fread(&wordWidth, 2, 1, infp);
+
+ volumeSet.rise(&setVolume); //attach set volume function to digital input
+ audio.power(0x07); //power up TLV apart from analogue input
+ audio.frequency(sampleRate); //set sample frequency
+ audio.format(wordWidth, (2-channels)); //set transfer protocol
+ audio.attach(&play); //attach interrupt handler to send data to TLV320
+ for(int j = 0; j < 4096; ++j){ //upon interrupt generation
+ circularBuffer[j] = 0; //clear circular buffer
+ }
+ audio.start(TRANSMIT); //interrupt come from the I2STXFIFO only
+ fillBuffer(); //continually fill circular buffer
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri Aug 05 10:07:47 2011 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/63bcd7ba4912