bsp.aun2402/source/BSP/I2C.c

#include "bsp.h"
#include "utils.h"
#include "I2C.h"


void  I2C_Device_Init(void)
{
    GPIO_InitTypeDef  GPIO_InitStruct;

    BSP_I2Cx_SCL_GPIO_CLK_ENABLE();
    BSP_I2Cx_SDA_GPIO_CLK_ENABLE();
    BSP_EEROM_WRITE_PROTECT_CLK_ENABLE();
    BSP_RTC_INTERRUPT_CLK_ENABLE();

    GPIO_InitStruct.Pin       = BSP_I2Cx_SDA_PIN;
    GPIO_InitStruct.Mode      = GPIO_MODE_OUTPUT_OD;//GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull      = BSP_I2Cx_SDA_PULL;
    GPIO_InitStruct.Speed     = GPIO_SPEED_HIGH;
    HAL_GPIO_Init(BSP_I2Cx_SDA_GPIO_PORT, &GPIO_InitStruct);

    GPIO_InitStruct.Pin       = BSP_I2Cx_SCL_PIN;
    GPIO_InitStruct.Mode      = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull      = GPIO_PULLUP;
    GPIO_InitStruct.Speed     = GPIO_SPEED_HIGH;
    HAL_GPIO_Init(BSP_I2Cx_SCL_GPIO_PORT, &GPIO_InitStruct);

    GPIO_InitStruct.Pin       = BSP_EEROM_WRITE_PROTECT_PIN;
    GPIO_InitStruct.Mode      = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull      = BSP_EEROM_WRITE_PROTECT_PULL;
    GPIO_InitStruct.Speed     = GPIO_SPEED_HIGH;
    HAL_GPIO_Init(BSP_EEROM_WRITE_PROTECT_PORT, &GPIO_InitStruct);
    BSP_EEROM_WRITE_FORBIDEN();


    GPIO_InitStruct.Pin       = BSP_RTC_INTERRUPT_PIN;
    GPIO_InitStruct.Mode      = GPIO_MODE_IT_FALLING;
    GPIO_InitStruct.Pull      = BSP_RTC_INTERRUPT_PULL;
    GPIO_InitStruct.Speed     = GPIO_SPEED_HIGH;
    HAL_GPIO_Init(BSP_RTC_INTERRUPT_PORT, &GPIO_InitStruct);

    HAL_NVIC_SetPriority(BSP_RTC_INTERRUPT_IRQn, BSP_RTC_INTERRUPT_PRIORITY, 0);
    HAL_NVIC_EnableIRQ(BSP_RTC_INTERRUPT_IRQn);
}

//Set SDA to pushpull output
void I2C_GPIO_Out_Config(void)
{
    GPIO_InitTypeDef  GPIO_InitStruct;

    GPIO_InitStruct.Pin       = BSP_I2Cx_SDA_PIN;
    GPIO_InitStruct.Mode      = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull      = BSP_I2Cx_SDA_PULL;
    GPIO_InitStruct.Speed     = GPIO_SPEED_FAST;
    HAL_GPIO_Init(BSP_I2Cx_SDA_GPIO_PORT, &GPIO_InitStruct);

}

//Set SDA to pull up input
void  I2C_GPIO_In_Config(void)
{
    GPIO_InitTypeDef  GPIO_InitStruct;

    GPIO_InitStruct.Pin       = BSP_I2Cx_SDA_PIN;
    GPIO_InitStruct.Mode      = GPIO_MODE_INPUT;
    GPIO_InitStruct.Pull      = BSP_I2Cx_SDA_PULL;
    GPIO_InitStruct.Speed     = GPIO_SPEED_FAST;
    HAL_GPIO_Init(BSP_I2Cx_SDA_GPIO_PORT, &GPIO_InitStruct);
}


#ifdef __GNUC__
#pragma GCC optimize ("O0")
#elif defined(__ICCARM__)
#pragma optimize=none
#endif
void I2C_Start(void)
{
  BSP_I2Cx_SCL_LOW();
  I2C_GPIO_Out_Config();
  BSP_I2Cx_SDA_HIGH();
  BSP_I2Cx_SCL_HIGH();
  Delay_us(I2C_DELAY_COUNT);
  BSP_I2Cx_SDA_LOW();
  Delay_us(I2C_DELAY_COUNT);
  BSP_I2Cx_SCL_LOW();
}


#ifdef __GNUC__
#pragma GCC optimize ("O0")
#elif defined(__ICCARM__)
#pragma optimize=none
#endif
void I2C_Stop(void)
{
  BSP_I2Cx_SCL_LOW();
  I2C_GPIO_Out_Config();
  BSP_I2Cx_SDA_LOW();                                       //I2CStop is generated after SCL is low
  Delay_us(I2C_DELAY_COUNT);
  BSP_I2Cx_SCL_HIGH();
  BSP_I2Cx_SDA_HIGH();
  Delay_us(I2C_DELAY_COUNT);
}

//Wait for ack
//Retur: 1, fails
//       0, success
#ifdef __GNUC__
#pragma GCC optimize ("O0")
#elif defined(__ICCARM__)
#pragma optimize=none
#endif
uint8_t I2C_Wait_Ack(void)
{
 uint8_t ucErrTime=0;
 BSP_I2Cx_SDA_HIGH();
 I2C_GPIO_In_Config();
 Delay_us(I2C_DELAY_COUNT);
 BSP_I2Cx_SCL_HIGH();
 Delay_us(I2C_DELAY_COUNT);
 while(BSP_I2Cx_SDA_STATUS())
 {
  ucErrTime++;
  if(ucErrTime>250)
  {
   I2C_Stop();
   return 1;
  }
 }
 BSP_I2Cx_SCL_LOW();//Set SCL = 0
 return 0;
}

//Generate ACK
#ifdef __GNUC__
#pragma GCC optimize ("O0")
#elif defined(__ICCARM__)
#pragma optimize=none
#endif
void I2C_Ack(void)
{
 BSP_I2Cx_SCL_LOW();
 I2C_GPIO_Out_Config();
 BSP_I2Cx_SDA_LOW();
 Delay_us(I2C_DELAY_COUNT);
 BSP_I2Cx_SCL_HIGH();
 Delay_us(I2C_DELAY_COUNT);
 BSP_I2Cx_SCL_LOW();
}

//No ACK
#ifdef __GNUC__
#pragma GCC optimize ("O0")
#elif defined(__ICCARM__)
#pragma optimize=none
#endif
void I2C_NAck(void)
{
 BSP_I2Cx_SCL_LOW();
 I2C_GPIO_Out_Config();
 BSP_I2Cx_SDA_HIGH();
 Delay_us(I2C_DELAY_COUNT);
 BSP_I2Cx_SCL_HIGH();
 Delay_us(I2C_DELAY_COUNT);
 BSP_I2Cx_SCL_LOW();
}