GPIO模拟I2C

MTK2502平台GPIO模拟I2C实现

 

#include "kal_release.h"#include "pxs_custom.h"#include "drv_comm.h"#include "us_timer.h"#include "dcl.h"extern const char gpio_ms_i2c_clk_pin;extern const char gpio_ms_i2c_data_pin;#define MS_SCLgpio_ms_i2c_clk_pin#define MS_SDAgpio_ms_i2c_data_pin/******************************************************I2C header (slaver address|W/R)   macro define*******************************************************/#define MS_SLAVEADDR_W((0x33 << 1) + 0)//0x0001 0110 0x18*2#define MS_SLAVEADDR_R((0x33 << 1) + 1)//0x0001 0111  0x19/******************************************************GPIO macro define for software I2C*******************************************************/#define MS_CLK_PIN_GPIO_MODEGPIO_ModeSetup(MS_SCL,0)#define MS_DATA_PIN_GPIO_MODEGPIO_ModeSetup(MS_SDA,0)#define MS_I2C_CLK_OUTPUTGPIO_InitIO(OUTPUT,MS_SCL)#define MS_I2C_DATA_OUTPUTGPIO_InitIO(OUTPUT,MS_SDA)#define MS_I2C_DATA_INPUT   GPIO_InitIO(INPUT,MS_SDA)#define MS_I2C_CLK_HIGHGPIO_WriteIO(1,MS_SCL)#define MS_I2C_CLK_LOWGPIO_WriteIO(0,MS_SCL)#define MS_I2C_DATA_HIGHGPIO_WriteIO(1,MS_SDA)#define MS_I2C_DATA_LOWGPIO_WriteIO(0,MS_SDA)#define MS_I2C_GET_BITGPIO_ReadIO(MS_SDA)void I2C_DELAY(kal_uint32 delay){kal_uint32 tick, duration;tick = drv_get_current_time();do{duration = drv_get_duration_ms(tick);}while(duration < delay);}void PAH_i2c_udelay(kal_uint32 delay){kal_uint32 ust = 0; //ust_get_current_timekal_uint32 count = 0;kal_uint32 break_count = 0;ust = ust_get_current_time();do{if(ust_get_current_time() != ust)count++;elsebreak_count++;}while((count < delay) && (break_count < 0xFFFFFF));}void PAH_i2c_start(void){MS_CLK_PIN_GPIO_MODE;MS_I2C_CLK_OUTPUT;MS_DATA_PIN_GPIO_MODE;MS_I2C_DATA_OUTPUT;MS_I2C_DATA_HIGH;MS_I2C_CLK_HIGH;PAH_i2c_udelay(40);//20MS_I2C_DATA_LOW;PAH_i2c_udelay(20);//10MS_I2C_CLK_LOW;PAH_i2c_udelay(20);//10}void PAH_i2c_stop(void){MS_I2C_CLK_OUTPUT;MS_I2C_DATA_OUTPUT;PAH_i2c_udelay(20);//10MS_I2C_CLK_HIGH;PAH_i2c_udelay(20);//10MS_I2C_DATA_HIGH;}void PAH_i2c_one_clk(void){PAH_i2c_udelay(10);//5MS_I2C_CLK_HIGH;PAH_i2c_udelay(20);//10MS_I2C_CLK_LOW;PAH_i2c_udelay(10);//5}kal_uint8 pah_ReadByteAck(void){kal_int8 i;kal_uint8 data;MS_I2C_DATA_INPUT; data = 0; for (i=7; i>=0; i--) {if (MS_I2C_GET_BIT){data |= (0x01<<i);}PAH_i2c_one_clk();}                                MS_I2C_DATA_OUTPUT;                    MS_I2C_DATA_LOW;                       PAH_i2c_one_clk();                         return data;}kal_uint8 pah_ReadByteNAck(void){kal_int8 i;kal_uint8 data;MS_I2C_DATA_INPUT; data = 0; for (i=7; i>=0; i--) {if (MS_I2C_GET_BIT){data |= (0x01<<i);}PAH_i2c_one_clk();}                                MS_I2C_DATA_OUTPUT;                                           MS_I2C_DATA_HIGH;PAH_i2c_one_clk();                         return data;}void pah_SendByte(kal_uint8 sData) {kal_int8 i;for (i=7; i>=0; i--) {            if ((sData>>i)&0x01) {               MS_I2C_DATA_HIGH;              } else { MS_I2C_DATA_LOW;                  }PAH_i2c_one_clk();                        }}kal_bool pah_ChkAck(void){MS_I2C_DATA_INPUT;PAH_i2c_udelay(10);//5MS_I2C_CLK_HIGH;PAH_i2c_udelay(10);//5if(MS_I2C_GET_BIT)//Non-ack{PAH_i2c_udelay(10);//5MS_I2C_CLK_LOW;PAH_i2c_udelay(10);//5MS_I2C_DATA_OUTPUT;MS_I2C_DATA_LOW;return KAL_FALSE;}else//Ack{PAH_i2c_udelay(10);//5MS_I2C_CLK_LOW;PAH_i2c_udelay(10);//5MS_I2C_DATA_OUTPUT;MS_I2C_DATA_LOW;return KAL_TRUE;}}void pah_Restart(void){MS_I2C_CLK_OUTPUT;MS_I2C_DATA_OUTPUT;PAH_i2c_udelay(40);MS_I2C_DATA_HIGH;PAH_i2c_udelay(20);//10MS_I2C_CLK_HIGH;PAH_i2c_udelay(40);MS_I2C_DATA_LOW;PAH_i2c_udelay(20);//10MS_I2C_CLK_LOW;PAH_i2c_udelay(20);//10}void PAH8001ei_DelayMS(kal_uint16 delay){kal_uint16 i=0;for(i=0; i<delay; i++){PAH_i2c_udelay(1000);}}/* *读寄存器 */kal_bool pah8001ei_reg_read( kal_uint8 RegAddr,kal_uint8* Data){PAH_i2c_start();//start bitpah_SendByte(MS_SLAVEADDR_W);//slave address|write bitif(KAL_FALSE == pah_ChkAck())//check Ack bit{//TO_DO: display ack check fail when send write id//ms_dbg_print(MOD_AUX, "ack fail when send wid in readbytes");//ms_dbg_print_ps("ack fail when send wid in readbytes\n\r");PAH_i2c_stop();return KAL_FALSE;}pah_SendByte(RegAddr);//send RegAddrif(KAL_FALSE == pah_ChkAck())//check Ack bit{//TO_DO: display ack check fail when send RegAddr//ms_dbg_print(MOD_AUX, "ack fail when send Reg in readbytes");//ms_dbg_print_ps("ack fail when send Reg in readbytes\n\r");PAH_i2c_stop();return KAL_FALSE;}pah_Restart();//restart bitpah_SendByte(MS_SLAVEADDR_R);//slave address|read bitif(KAL_FALSE == pah_ChkAck()){//TO_DO: display ack check fail when send read id//ms_dbg_print(MOD_AUX, "ack fail when send rid in readbytes");//ms_dbg_print_ps("ack fail when send rid in readbytes\n\r");PAH_i2c_stop();return KAL_FALSE;}*Data = pah_ReadByteNAck();PAH_i2c_stop();//stop bit//TO_DO: add debug code to display the data receivedreturn KAL_TRUE;}/* *连续读寄存器 */kal_bool PAH8001ei_ConReadBytes(kal_uint8* Data, kal_uint8 RegAddr, kal_uint16 Length){kal_uint8* Data_ptr;kal_uint16 i;Data_ptr = Data;PAH_i2c_start();//start bitpah_SendByte(MS_SLAVEADDR_W);//slave address|write bitif(KAL_FALSE == pah_ChkAck())//check Ack bit{//TO_DO: display ack check fail when send write id//ms_dbg_print(MOD_AUX, "ack fail when send wid in conread");//ms_dbg_print_ps("ack fail when send wid in conread\n\r");PAH_i2c_stop();return KAL_FALSE;}pah_SendByte(RegAddr);//send RegAddrif(KAL_FALSE == pah_ChkAck())//check Ack bit{//TO_DO: display ack check fail when send RegAddr//ms_dbg_print(MOD_AUX, "ack fail when send Reg in conread");//ms_dbg_print_ps("ack fail when send Reg in conread\n\r");PAH_i2c_stop();return KAL_FALSE;}pah_Restart();//restart bitpah_SendByte(MS_SLAVEADDR_R);//slave address|read bitif(KAL_FALSE == pah_ChkAck()){//TO_DO: display ack check fail when send read id//ms_dbg_print(MOD_AUX, "ack fail when send rid in conread");//ms_dbg_print_ps("ack fail when send rid in conread\n\r");PAH_i2c_stop();return KAL_FALSE;}for(i=Length; i>1; i--){*Data_ptr = pah_ReadByteAck();//read byte with ackData_ptr++;}*Data_ptr = pah_ReadByteNAck();//read byte with non-ack to stop readingPAH_i2c_stop();//stop bit//TO_DO: add debug code to display the data receivedreturn KAL_TRUE;}/* *写寄存器 */kal_bool pah8001ei_reg_write(kal_uint8 RegAddr, kal_uint8 Data){PAH_i2c_start();//start bitpah_SendByte(MS_SLAVEADDR_W);//slave address|write bitif(KAL_FALSE == pah_ChkAck())//check Ack bit{//TO_DO: display check ack fail when send write id//ms_dbg_print(MOD_AUX, "ack fail when send wid in writebytes");//ms_dbg_print_ps("ack fail when send wid in writebytes\n\r");PAH_i2c_stop();return KAL_FALSE;}pah_SendByte(RegAddr);//send RegAddrif(KAL_FALSE == pah_ChkAck())//check Ack bit{//TO_DO: display check ack fail when send RegAddr//ms_dbg_print(MOD_AUX, "ack fail when send Reg in wirtebytes");//ms_dbg_print_ps("ack fail when send Reg in wirtebytes\n\r");PAH_i2c_stop();return KAL_FALSE;}pah_SendByte(Data);//send parameterif(KAL_FALSE == pah_ChkAck()){//TO_DO: display check ack fail when send data//ms_dbg_print(MOD_AUX, "ack fail when send para in writebytes");//ms_dbg_print_ps("ack fail when send para in writebytes\n\r");PAH_i2c_stop();return KAL_FALSE;}PAH_i2c_stop();//stop bitreturn KAL_TRUE;}/* *写一个寄存器 */void writeRegister(kal_uint8 reg_addr, kal_uint8 value){kal_bool ret = KAL_FALSE;ret = pah8001ei_reg_write(reg_addr, value);if(ret == KAL_FALSE) {kal_prompt_trace(MOD_MMI, "[LXZ]writeRegister error reg_addr = %x, value = %x", reg_addr, value);}}/* *读一个寄存器 */kal_uint8 readRegister(kal_uint8 reg_addr){kal_uint8 temp = 0;kal_bool ret = KAL_FALSE;ret = pah8001ei_reg_read(reg_addr, &temp);if (ret == KAL_FALSE) {kal_prompt_trace(MOD_MMI, "[LXZ]readRegister error reg_addr = %x value = %x", reg_addr, temp);}return temp;}/* *读多寄存器 */void readRegisterCont(kal_uint8 reg_addr, kal_uint8 *buffer, kal_uint8 length){kal_bool ret = KAL_FALSE;ret = PAH8001ei_ConReadBytes(buffer, reg_addr, length);if (ret == KAL_FALSE) {kal_prompt_trace(MOD_MMI, "[LXZ]readRegisterCont error reg_addr = %x", reg_addr);}}