Yifei Teng
AK8963
Diff: I2Cdev.cpp
- Revision:
- 1:f8ba8df44aab
- Parent:
- 0:ec59a31e784b
- Child:
- 2:51199a6440be
--- a/I2Cdev.cpp Wed Mar 28 20:25:57 2018 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,294 +0,0 @@
-// ported from arduino library: https://github.com/jrowberg/i2cdevlib
-// written by szymon gaertig (email: szymon@gaertig.com.pl, website: szymongaertig.pl)
-// Changelog:
-// 2013-01-08 - first release
-
-#include "I2Cdev.h"
-#include "MODI2C.h"
-
-//#define useDebugSerial
-
-I2Cdev::I2Cdev(): debugSerial(USBTX, USBRX), i2c(I2C_SDA,I2C_SCL)
-{
-
-}
-
-I2Cdev::I2Cdev(PinName i2cSda, PinName i2cScl): debugSerial(USBTX, USBRX), i2c(i2cSda,i2cScl)
-{
-
-}
-
-/** Read a single bit from an 8-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to read from
- * @param bitNum Bit position to read (0-7)
- * @param data Container for single bit value
- * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
- * @return Status of read operation (true = success)
- */
-int8_t I2Cdev::readBit(uint8_t devAddr, uint8_t regAddr, uint8_t bitNum, uint8_t *data, uint16_t timeout) {
- uint8_t b;
- uint8_t count = readByte(devAddr, regAddr, &b, timeout);
- *data = b & (1 << bitNum);
- return count;
-}
-
-/** Read a single bit from a 16-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to read from
- * @param bitNum Bit position to read (0-15)
- * @param data Container for single bit value
- * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
- * @return Status of read operation (true = success)
- */
-int8_t I2Cdev::readBitW(uint8_t devAddr, uint8_t regAddr, uint8_t bitNum, uint16_t *data, uint16_t timeout) {
- uint16_t b;
- uint8_t count = readWord(devAddr, regAddr, &b, timeout);
- *data = b & (1 << bitNum);
- return count;
-}
-
-/** Read multiple bits from an 8-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to read from
- * @param bitStart First bit position to read (0-7)
- * @param length Number of bits to read (not more than 8)
- * @param data Container for right-aligned value (i.e. '101' read from any bitStart position will equal 0x05)
- * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
- * @return Status of read operation (true = success)
- */
-int8_t I2Cdev::readBits(uint8_t devAddr, uint8_t regAddr, uint8_t bitStart, uint8_t length, uint8_t *data, uint16_t timeout) {
- // 01101001 read byte
- // 76543210 bit numbers
- // xxx args: bitStart=4, length=3
- // 010 masked
- // -> 010 shifted
- uint8_t count, b;
- if ((count = readByte(devAddr, regAddr, &b, timeout)) != 0) {
- uint8_t mask = ((1 << length) - 1) << (bitStart - length + 1);
- b &= mask;
- b >>= (bitStart - length + 1);
- *data = b;
- }
- return count;
-}
-
-/** Read multiple bits from a 16-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to read from
- * @param bitStart First bit position to read (0-15)
- * @param length Number of bits to read (not more than 16)
- * @param data Container for right-aligned value (i.e. '101' read from any bitStart position will equal 0x05)
- * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
- * @return Status of read operation (1 = success, 0 = failure, -1 = timeout)
- */
-int8_t I2Cdev::readBitsW(uint8_t devAddr, uint8_t regAddr, uint8_t bitStart, uint8_t length, uint16_t *data, uint16_t timeout) {
- // 1101011001101001 read byte
- // fedcba9876543210 bit numbers
- // xxx args: bitStart=12, length=3
- // 010 masked
- // -> 010 shifted
- uint8_t count;
- uint16_t w;
- if ((count = readWord(devAddr, regAddr, &w, timeout)) != 0) {
- uint16_t mask = ((1 << length) - 1) << (bitStart - length + 1);
- w &= mask;
- w >>= (bitStart - length + 1);
- *data = w;
- }
- return count;
-}
-/** Read single byte from an 8-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to read from
- * @param data Container for byte value read from device
- * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
- * @return Status of read operation (true = success)
- */
-int8_t I2Cdev::readByte(uint8_t devAddr, uint8_t regAddr, uint8_t *data, uint16_t timeout) {
- return readBytes(devAddr, regAddr, 1, data, timeout);
-}
-
-/** Read single word from a 16-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to read from
- * @param data Container for word value read from device
- * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
- * @return Status of read operation (true = success)
- */
-int8_t I2Cdev::readWord(uint8_t devAddr, uint8_t regAddr, uint16_t *data, uint16_t timeout) {
- return readWords(devAddr, regAddr, 1, data, timeout);
-}
-
-/** Read multiple bytes from an 8-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr First register regAddr to read from
- * @param length Number of bytes to read
- * @param data Buffer to store read data in
- * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
- * @return Number of bytes read (-1 indicates failure)
- */
-int8_t I2Cdev::readBytes(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint8_t *data, uint16_t timeout)
-{
- char command[1];
- command[0] = regAddr;
- i2c.write(devAddr, command, 1, true);
- i2c.read(devAddr, (char*)data, length);
- return length;
-}
-
-void I2Cdev::readBytes_nb(uint8_t devAddr, char *command, uint8_t length, uint8_t *data, uint32_t (*function)(uint32_t), void* param)
-{
- i2c.write(devAddr, command, 1, true);
- i2c.read_nb(devAddr, (char*)data, length, function, param);
-}
-
-int8_t I2Cdev::readWords(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint16_t *data, uint16_t timeout)
-{
- return 0;
-}
-
-/** write a single bit in an 8-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to write to
- * @param bitNum Bit position to write (0-7)
- * @param value New bit value to write
- * @return Status of operation (true = success)
- */
-bool I2Cdev::writeBit(uint8_t devAddr, uint8_t regAddr, uint8_t bitNum, uint8_t data) {
- uint8_t b;
- readByte(devAddr, regAddr, &b);
- b = (data != 0) ? (b | (1 << bitNum)) : (b & ~(1 << bitNum));
- return writeByte(devAddr, regAddr, b);
-}
-
-/** write a single bit in a 16-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to write to
- * @param bitNum Bit position to write (0-15)
- * @param value New bit value to write
- * @return Status of operation (true = success)
- */
-bool I2Cdev::writeBitW(uint8_t devAddr, uint8_t regAddr, uint8_t bitNum, uint16_t data) {
- uint16_t w;
- readWord(devAddr, regAddr, &w);
- w = (data != 0) ? (w | (1 << bitNum)) : (w & ~(1 << bitNum));
- return writeWord(devAddr, regAddr, w);
-}
-
-/** Write multiple bits in an 8-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to write to
- * @param bitStart First bit position to write (0-7)
- * @param length Number of bits to write (not more than 8)
- * @param data Right-aligned value to write
- * @return Status of operation (true = success)
- */
-bool I2Cdev::writeBits(uint8_t devAddr, uint8_t regAddr, uint8_t bitStart, uint8_t length, uint8_t data) {
- // 010 value to write
- // 76543210 bit numbers
- // xxx args: bitStart=4, length=3
- // 00011100 mask byte
- // 10101111 original value (sample)
- // 10100011 original & ~mask
- // 10101011 masked | value
- uint8_t b;
- if (readByte(devAddr, regAddr, &b) != 0) {
- uint8_t mask = ((1 << length) - 1) << (bitStart - length + 1);
- data <<= (bitStart - length + 1); // shift data into correct position
- data &= mask; // zero all non-important bits in data
- b &= ~(mask); // zero all important bits in existing byte
- b |= data; // combine data with existing byte
- return writeByte(devAddr, regAddr, b);
- } else {
- return false;
- }
-}
-
-/** Write multiple bits in a 16-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to write to
- * @param bitStart First bit position to write (0-15)
- * @param length Number of bits to write (not more than 16)
- * @param data Right-aligned value to write
- * @return Status of operation (true = success)
- */
-bool I2Cdev::writeBitsW(uint8_t devAddr, uint8_t regAddr, uint8_t bitStart, uint8_t length, uint16_t data) {
- // 010 value to write
- // fedcba9876543210 bit numbers
- // xxx args: bitStart=12, length=3
- // 0001110000000000 mask byte
- // 1010111110010110 original value (sample)
- // 1010001110010110 original & ~mask
- // 1010101110010110 masked | value
- uint16_t w;
- if (readWord(devAddr, regAddr, &w) != 0) {
- uint8_t mask = ((1 << length) - 1) << (bitStart - length + 1);
- data <<= (bitStart - length + 1); // shift data into correct position
- data &= mask; // zero all non-important bits in data
- w &= ~(mask); // zero all important bits in existing word
- w |= data; // combine data with existing word
- return writeWord(devAddr, regAddr, w);
- } else {
- return false;
- }
-}
-
-/** Write single byte to an 8-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register address to write to
- * @param data New byte value to write
- * @return Status of operation (true = success)
- */
-bool I2Cdev::writeByte(uint8_t devAddr, uint8_t regAddr, uint8_t data) {
- return writeBytes(devAddr, regAddr, 1, &data);
-}
-
-/** Write single word to a 16-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register address to write to
- * @param data New word value to write
- * @return Status of operation (true = success)
- */
-bool I2Cdev::writeWord(uint8_t devAddr, uint8_t regAddr, uint16_t data) {
- return writeWords(devAddr, regAddr, 1, &data);
-}
-
-uint32_t writefinhdl(uint32_t param){
- //free((void*)param);
- ((I2Cdev*)param)->freebuffer();
- return 0;
-}
-
-bool I2Cdev::writeBytes(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint8_t *data)
-{
- char* mem = NULL;
- mem = allocbuffer();
- *mem = regAddr;
- memcpy(mem+1, data, length);
-
- i2c.write(devAddr, mem, length+1, &writefinhdl, this);
- return true;
-}
-
-char *I2Cdev::allocbuffer(){
- char *buff = (char *)pool.alloc();
- while (buff==NULL) buff = (char *)pool.alloc();
- queue.put(buff);
- return buff;
-}
-
-void I2Cdev::freebuffer(){
- osEvent evt = queue.get(0);
- pool.free((char(*)[14])evt.value.p);
-}
-
-bool I2Cdev::writeWords(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint16_t *data)
-{
- return true;
-}
-
-uint16_t I2Cdev::readTimeout(void)
-{
- return 0;
-}
\ No newline at end of file