Diff: mini_board_libs/parallel_bus/hardware_abs.c

Revision:

6:1fc6a640d320

Parent:

5:57c345099873

Child:

7:87fd13f1faa6

--- a/mini_board_libs/parallel_bus/hardware_abs.c	Mon Mar 26 06:17:23 2012 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,220 +0,0 @@
-/** A sample code for "mini board PCU9669/PCA9665"
- *
- *  @author  Tedd OKANO, NXP Semiconductors
- *  @version 0.9
- *  @date    14-Feb-2011
- *
- *  Released under the MIT License: http://mbed.org/license/mit
- *
- *  An operation sample of PCU9669/PCA9665 I2C bus controller.
- *  The mbed accesses the bus controller's parallel port (8/2 bit address and 8 bit data) by bit-banging.
- *  The bit-banging is poerformed by PortInOut function of mbed library.
- *
- *    To make the code porting easier, all codes are partitioned into layers to abstract other parts.
- *    The mbed specific parts are concentrated in lowest layer: "hardware_abs.*".
- *    This module may need to be modified for the porting.
- *
- *    All other upper layers are writen in standard-C.
- *
- *    base code is written from 05-Sep-2011 to 09-Sep-2011.
- *    And demo code has been build on 11-Sep-2011.
- *    Debug and code adjustment has been done on 08-Sep-2011.
- *    Small sanitization for main.cpp. All mbed related codes are moved in to "hardware_abs.*". 13-Oct-2011
- *    hardware_abs are moved into parallel_bus library folder, 3 LED driver operation sample 13-Feb.-2012
- *    PCU9669 and PCA9665 codes are packed in a project 14-Feb-2012. 
- *    
- *    Before builidng the code, please edit the file mini_board_PCU9669/config.h
- *    Uncomment the target name what you want to target. 
- */
-
-/*
- *  "hardware_abs" module has been made to abstract hardware: Hardware abstract layer
- *  This is file which will be modified when the porting done for other MCUs. 
- */
- 
-/*
- *  This sample code has been made for mbed. The code emulates parallel SRAM bus using the mbed's GPIO ports. 
- *  To maximize the port access speed, PortOut and PortInOut libraly used. 
- */
-
-#include    "mbed.h"
-#include    "hardware_abs.h"
-
-//  GPIO port setting
-
-#define     ADDR_MASK       0x07878000  //  8 bit address mask on PORT0: Address value will be set into this bit position
-#define     DATA_MASK       0x00000FF0  //  8 bit data mask on PORT0: Data value will be appeared on this bit position
-#define     CONTROL_MASK    0x00000038  //  Control signals CS=bit5(pin21), WR=bit4(pin22), RD=bit3(pin23)
-
-PortOut     addr_port( Port0, ADDR_MASK );
-PortInOut   data_port( Port0, DATA_MASK );
-PortOut     ctrl_port( Port2, CONTROL_MASK );
-InterruptIn int_port( p26 );
-
-//  The very early version of PCU9669 mini board has different configuration. 
-//  Following part switches the port configuration for those board versions.
-
-//#define     PROTOTYPE_BREADBOARD
-
-DigitalInOut    reset_port( p20 );
-//DigitalOut      trig_port( p19 );
-
-//  Next two macros defines interface for temporaly interrupt disable/enable functions. 
-//  These macros are used to blocking interrupt until a bus access cycle completed.
-//  Because if the interrupt happened in a cycle, the emulated parallel port state will be disturbed.  
-//  For the mbed, library routine: __disable_irq() / __enable_irq() can be used. 
-
-#define     interrupt_enable()    __enable_irq()
-#define     interrupt_disable()   __disable_irq()
-
-//  "prev_access_was_write" is a variable to keep the previous data directions. 
-//  Using this flag, successive write and read addess overhead can be reduced. 
-//  This mechanism will not be required if the MCU has parallel port
-
-char        prev_access_was_write;
-
-//  ISR routine installer
-
-void install_ISR( void (*fptr)(void) ) {
-    int_port.fall( fptr );
-}
-
-//  Hardware initialize: it defines initial state of the (emulated) parallel bus
-
-void hardware_initialize( void ) {
-    prev_access_was_write   = 0;
-    ctrl_port               = 0x38;     //  CS, WR and RD are deaserted (HIGH)
-    data_port.input();                  //  data bus set to Hi-Z
-    reset_port.output();
-    reset_port.mode( PullUp );
-}
-
-//  Hardware reset for PCU9669: It asserts RESET signal for 4us and waits 650us after deassert (reset recovery time)
-
-void reset( int reset_pulse_width_us, int reset_recovery_us ) {
-    hardware_reset( ASSERT );            //  Minimum pulse width is 4us for PCU9669
-    hw_wait_us( reset_pulse_width_us );
-    hardware_reset( DEASSERT );          //  deassert hardware /RESET sgnal
-    hw_wait_us( reset_recovery_us );
-}
-
-//  Interface to Control hardware RESET signal
-
-void hardware_reset( char signal ) {
-    reset_port  = signal;
-}
-
-//  Interface to Control hardware TRIGGER signal
-
-void hardware_trigger( char signal ) {
-//    trig_port  = signal;
-}
-
-//  Single write cycle on (emulated) parallel bus
-
-void write_data( char addr, char data ) {
-    interrupt_disable();    //  disable interrupt first
-
-    addr_port   = (addr << 19) | (addr << 15);  //  Address output
-    ctrl_port   = 0x08;                         //  Assert CS and WR signals
-
-    if ( !prev_access_was_write )               //  Data bus direction control
-        data_port.output();
-
-    prev_access_was_write  = 1;
-
-    data_port   = data << 4;                    //  Data output
-    ctrl_port   = 0x38;                         //  Deassert CS and WR
-
-    interrupt_enable();    //  enable interrupt again
-}
-
-
-char read_data( char addr ) {
-    volatile char    tmp;
-    interrupt_disable();    //  disable interrupt first
-
-    if ( prev_access_was_write )    //  Data bus direction control
-        data_port.input();
-
-    prev_access_was_write  = 0;
-
-    addr_port   = (addr << 19) | (addr << 15);  //  Address output
-    ctrl_port   = 0x10;                         //  Assert CS and RD signals
-    ctrl_port   = 0x10;                         //  asserting CS and RD pulse twice (but those are kept LOW) to wait short time till actual read timing
-    tmp         = (data_port >> 4) & 0xFF;      //  Read data bus into var
-    ctrl_port   = 0x38;                         //  Deassert CS and RD
-
-    interrupt_enable();    //  enable interrupt again
-
-    return ( tmp );
-}
-
-//  Wait for micro-seconds
-
-void hw_wait_us( int v ) {
-    wait_us( v );
-}
-
-//  Wait for seconds
-
-void wait_sec( float f ) {
-    wait( f );
-}
-
-//  Following part is an optionto accerelate bus access. 
-//  If such trick is not required, undefine the "BURST_DATA_ACCESS" and don't touch it.
-//
-//  Next two functions access single address with repeating read/write. 
-//  The repeating read/write are used often for PCU9669 like SLATABLE, TRANCONFIG and DATA (buffer accesses). 
-//  So this accerelation contributes saving MCU time. 
-//
-//  For the porting, it may be good idea to modify those routines to DMA access. 
-
-#ifdef  BURST_DATA_ACCESS
-
-void write_data_burst( char addr, char *data, char length ) {
-    int     i;
-
-    interrupt_disable();    //  disable interrupt first
-
-    addr_port   = (addr << 19) | (addr << 15);  //  Address output
-
-    if ( !prev_access_was_write )       //  Data bus direction control
-        data_port.output();
-
-    prev_access_was_write  = 1;
-
-    for ( i = 0; i < length; i++ ) {    //  repeat data write access
-        ctrl_port   = 0x08;
-        data_port   = *(data + i) << 4;
-        ctrl_port   = 0x38;
-    }
-
-    interrupt_enable();
-}
-
-void read_data_burst( char addr, char *data, char length ) {
-    int     i;
-
-    interrupt_disable();    //  disable interrupt first
-
-    addr_port   = (addr << 19) | (addr << 15);  //  Address output
-
-    if ( prev_access_was_write )       //  Data bus direction control
-        data_port.input();
-
-    prev_access_was_write  = 0;
-
-    for ( i = 0; i < length; i++ ) {    //  repeat data read access
-        ctrl_port   = 0x10;
-        ctrl_port   = 0x10;
-
-        *(data + i) = (data_port >> 4) & 0xFF;
-        ctrl_port   = 0x38;
-    }
-    interrupt_enable();
-}
-
-#endif
-