motor_ctl-1/3.BasicFunction/Source/i2c_analog.c

#include "i2c_analog.h"
#include "ti_msp_dl_config.h"

#define SCL_L()            DL_GPIO_clearPins(TMAG5273_PORT, TMAG5273_SCL_PIN)
#define SCL_H()            DL_GPIO_setPins(TMAG5273_PORT, TMAG5273_SCL_PIN)
#define SDA_L()            DL_GPIO_clearPins(TMAG5273_PORT, TMAG5273_SDA_PIN)
#define SDA_H()            DL_GPIO_setPins(TMAG5273_PORT, TMAG5273_SDA_PIN)

#define SDAM()             DL_GPIO_readPins(TMAG5273_PORT, TMAG5273_SDA_PIN)
#define SET_SCL_OUT()      {DL_GPIO_initDigitalOutput(TMAG5273_SCL_IOMUX);DL_GPIO_enableOutput(TMAG5273_PORT, TMAG5273_SCL_PIN);}
#define SET_SDA_OUT()      {DL_GPIO_initDigitalOutput(TMAG5273_SDA_IOMUX);DL_GPIO_enableOutput(TMAG5273_PORT, TMAG5273_SDA_PIN);}
#define SET_SDA_IN()       DL_GPIO_initDigitalInput(TMAG5273_SDA_IOMUX)

void I2C_Delay(void)
{
    delay_cycles(20); //SCL周期1us
}

void I2C_Init(void)
{
    SET_SCL_OUT();
    SET_SDA_OUT();
}

void I2C_Start(void)
{
    SDA_H();
    SCL_H();
    I2C_Delay();
    SDA_L();
    I2C_Delay();
    SCL_L();
}

void I2C_Stop(void)
{
    SCL_L();
    SDA_L();
    I2C_Delay();
    SCL_H();
    SDA_H();
    I2C_Delay();
}

void I2C_SendACK(UBYTE ack)
{
    if(ack == 0)
    {
      SDA_L();
    }
    else
    {
      SDA_H();
    }
    SCL_H();
    I2C_Delay();
    SCL_L();
    I2C_Delay();
}

void I2C_SendByte(UBYTE sendDAT)
{
    UBYTE i,revack;

    for (i= 0 ; i< 8; i++)
    {
       SCL_L();
       I2C_Delay();
       if (sendDAT & 0x80)             // write data
       {
          SDA_H();
       }
       else
       {
          SDA_L();
       }
        sendDAT <<=  1;
        SCL_H();
        I2C_Delay();
    }
   SCL_L();
   I2C_Delay();
   SET_SDA_IN();
   SCL_H();
   delay_cycles(5);
   revack = (UBYTE)SDAM();
   I2C_Delay();
   SCL_L();
   SET_SDA_OUT();
}

UBYTE I2C_RecvByte(void)
{
    UBYTE i;
    UBYTE revDAT = 0;

    SDA_H();
    SET_SDA_IN();
    for (i=0; i<8; i++)
    {
       revDAT <<= 1;
       SCL_H();
       if (SDAM())
       {
          revDAT |= 0x01;
       }
       else
       {
          revDAT &= 0xfe;
       }
       I2C_Delay();
       SCL_L();
       I2C_Delay();
    }
   SET_SDA_OUT();
   return revDAT;
}