STM32 HAL 硬件I2C HTU21D

主要用到stm32自帶的庫函數，因爲庫函數沒有等待時間，所以不兼容，把程序拷貝出來重寫，“I2C_RequestMemoryRead”函數的
“/* Generate Restart */”前面添加一個80ms左右的延時即可。
htu21d.h:

#ifndef _HTU21D_H
#define _HTU21D_H

#include "stm32f4xx_hal.h"

//非主機模式
#define HTU_TEMP    0xf3
#define HTU_HUMI    0Xf5

#define HTU21D_I2C &hi2c1

typedef struct
{
   float HTU21D_Temp;
   float HTU21D_Humi;
   uint8_t Read_Flag;
} HTU21D;

extern HTU21D htu21d;

void HTU21D_Get_Data(void);

#endif

htu21d.c:

#include "HTU21D.h"
#include "delay.h"
#include "main.h"
#include "i2c.h"

HTU21D htu21d;/**< htu21d結構體，包含溫度和溼度數據 */

static HAL_StatusTypeDef HAL_I2C_Mem_Read(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint16_t MemAddress, uint16_t MemAddSize, uint8_t *pData, uint16_t Size, uint32_t Timeout);/**< 讀取函數，因爲庫函數不兼容，因此在這重寫一個函數 */

void HTU21D_Get_Data(void)
{
    uint8_t rx_buf[2];
    float temp_float;
    
    if(HAL_I2C_Mem_Read(HTU21D_I2C, 0x80, HTU_TEMP, I2C_MEMADD_SIZE_8BIT, rx_buf, 2, 100) == HAL_OK)//讀取溫度
    {
        rx_buf[1] &= 0xfc;
        temp_float = rx_buf[0];
        temp_float *= 256.0f; //wendu <<=8;
        temp_float += rx_buf[1];
        temp_float = -46.85f + (175.72f * (temp_float*1.0f / 65536.0f));
        htu21d.HTU21D_Temp = temp_float;
    }
    if(HAL_I2C_Mem_Read(HTU21D_I2C, 0x80, HTU_HUMI, I2C_MEMADD_SIZE_8BIT, rx_buf, 2, 100) == HAL_OK) //讀取溼度
    {
        rx_buf[1] &= 0xfc;
        temp_float = rx_buf[0];
        temp_float *= 256.0f; //溼度 <<=8;
        temp_float += rx_buf[1];
        temp_float = -6.0f + (125.0f * (temp_float*1.0f / 65536.0f));
        htu21d.HTU21D_Humi = temp_float;
    }
}

static HAL_StatusTypeDef I2C_WaitOnFlagUntilTimeout(I2C_HandleTypeDef *hi2c, uint32_t Flag, FlagStatus Status, uint32_t Timeout, uint32_t Tickstart)
{
  /* Wait until flag is set */
  while (__HAL_I2C_GET_FLAG(hi2c, Flag) == Status)
  {
    /* Check for the Timeout */
    if (Timeout != HAL_MAX_DELAY)
    {
      if (((HAL_GetTick() - Tickstart) > Timeout) || (Timeout == 0U))
      {
        hi2c->PreviousState     = ((uint32_t)(HAL_I2C_MODE_NONE));
        hi2c->State             = HAL_I2C_STATE_READY;
        hi2c->Mode              = HAL_I2C_MODE_NONE;
        hi2c->ErrorCode         |= HAL_I2C_ERROR_TIMEOUT;

        /* Process Unlocked */
        __HAL_UNLOCK(hi2c);

        return HAL_ERROR;
      }
    }
  }
  return HAL_OK;
}

static HAL_StatusTypeDef I2C_WaitOnMasterAddressFlagUntilTimeout(I2C_HandleTypeDef *hi2c, uint32_t Flag, uint32_t Timeout, uint32_t Tickstart)
{
  while (__HAL_I2C_GET_FLAG(hi2c, Flag) == RESET)
  {
    if (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_AF) == SET)
    {
      /* Generate Stop */
      SET_BIT(hi2c->Instance->CR1, I2C_CR1_STOP);

      /* Clear AF Flag */
      __HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_AF);

      hi2c->PreviousState       = ((uint32_t)(HAL_I2C_MODE_NONE));
      hi2c->State               = HAL_I2C_STATE_READY;
      hi2c->Mode                = HAL_I2C_MODE_NONE;
      hi2c->ErrorCode           |= HAL_I2C_ERROR_AF;

      /* Process Unlocked */
      __HAL_UNLOCK(hi2c);

      return HAL_ERROR;
    }

    /* Check for the Timeout */
    if (Timeout != HAL_MAX_DELAY)
    {
      if (((HAL_GetTick() - Tickstart) > Timeout) || (Timeout == 0U))
      {
        hi2c->PreviousState       = ((uint32_t)(HAL_I2C_MODE_NONE));
        hi2c->State               = HAL_I2C_STATE_READY;
        hi2c->Mode                = HAL_I2C_MODE_NONE;
        hi2c->ErrorCode           |= HAL_I2C_ERROR_TIMEOUT;

        /* Process Unlocked */
        __HAL_UNLOCK(hi2c);

        return HAL_ERROR;
      }
    }
  }
  return HAL_OK;
}

static HAL_StatusTypeDef I2C_IsAcknowledgeFailed(I2C_HandleTypeDef *hi2c)
{
  if (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_AF) == SET)
  {
    /* Clear NACKF Flag */
    __HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_AF);

    hi2c->PreviousState       = ((uint32_t)(HAL_I2C_MODE_NONE));
    hi2c->State               = HAL_I2C_STATE_READY;
    hi2c->Mode                = HAL_I2C_MODE_NONE;
    hi2c->ErrorCode           |= HAL_I2C_ERROR_AF;

    /* Process Unlocked */
    __HAL_UNLOCK(hi2c);

    return HAL_ERROR;
  }
  return HAL_OK;
}


static HAL_StatusTypeDef I2C_WaitOnTXEFlagUntilTimeout(I2C_HandleTypeDef *hi2c, uint32_t Timeout, uint32_t Tickstart)
{
  while (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_TXE) == RESET)
  {
    /* Check if a NACK is detected */
    if (I2C_IsAcknowledgeFailed(hi2c) != HAL_OK)
    {
      return HAL_ERROR;
    }

    /* Check for the Timeout */
    if (Timeout != HAL_MAX_DELAY)
    {
      if (((HAL_GetTick() - Tickstart) > Timeout) || (Timeout == 0U))
      {
        hi2c->PreviousState       = ((uint32_t)(HAL_I2C_MODE_NONE));
        hi2c->State               = HAL_I2C_STATE_READY;
        hi2c->Mode                = HAL_I2C_MODE_NONE;
        hi2c->ErrorCode           |= HAL_I2C_ERROR_TIMEOUT;

        /* Process Unlocked */
        __HAL_UNLOCK(hi2c);

        return HAL_ERROR;
      }
    }
  }
  return HAL_OK;
}

static HAL_StatusTypeDef I2C_RequestMemoryRead(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint16_t MemAddress, uint16_t MemAddSize, uint32_t Timeout, uint32_t Tickstart)
{
  /* Enable Acknowledge */
  SET_BIT(hi2c->Instance->CR1, I2C_CR1_ACK);

  /* Generate Start */
  SET_BIT(hi2c->Instance->CR1, I2C_CR1_START);

  /* Wait until SB flag is set */
  if (I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_SB, RESET, Timeout, Tickstart) != HAL_OK)
  {
    if (hi2c->Instance->CR1 & I2C_CR1_START)
    {
      hi2c->ErrorCode = HAL_I2C_WRONG_START;
    }
    return HAL_TIMEOUT;
  }

  /* Send slave address */
  hi2c->Instance->DR = I2C_7BIT_ADD_WRITE(DevAddress);

  /* Wait until ADDR flag is set */
  if (I2C_WaitOnMasterAddressFlagUntilTimeout(hi2c, I2C_FLAG_ADDR, Timeout, Tickstart) != HAL_OK)
  {
    return HAL_ERROR;
  }

  /* Clear ADDR flag */
  __HAL_I2C_CLEAR_ADDRFLAG(hi2c);

  /* Wait until TXE flag is set */
  if (I2C_WaitOnTXEFlagUntilTimeout(hi2c, Timeout, Tickstart) != HAL_OK)
  {
    if (hi2c->ErrorCode == HAL_I2C_ERROR_AF)
    {
      /* Generate Stop */
      SET_BIT(hi2c->Instance->CR1, I2C_CR1_STOP);
    }
    return HAL_ERROR;
  }

  /* If Memory address size is 8Bit */
  if (MemAddSize == I2C_MEMADD_SIZE_8BIT)
  {
    /* Send Memory Address */
    hi2c->Instance->DR = I2C_MEM_ADD_LSB(MemAddress);
  }
  /* If Memory address size is 16Bit */
  else
  {
    /* Send MSB of Memory Address */
    hi2c->Instance->DR = I2C_MEM_ADD_MSB(MemAddress);

    /* Wait until TXE flag is set */
    if (I2C_WaitOnTXEFlagUntilTimeout(hi2c, Timeout, Tickstart) != HAL_OK)
    {
      if (hi2c->ErrorCode == HAL_I2C_ERROR_AF)
      {
        /* Generate Stop */
        SET_BIT(hi2c->Instance->CR1, I2C_CR1_STOP);
      }
      return HAL_ERROR;
    }

    /* Send LSB of Memory Address */
    hi2c->Instance->DR = I2C_MEM_ADD_LSB(MemAddress);
  }

  /* Wait until TXE flag is set */
  if (I2C_WaitOnTXEFlagUntilTimeout(hi2c, Timeout, Tickstart) != HAL_OK)
  {
    if (hi2c->ErrorCode == HAL_I2C_ERROR_AF)
    {
      /* Generate Stop */
      SET_BIT(hi2c->Instance->CR1, I2C_CR1_STOP);
    }
    return HAL_ERROR;
  }
  delay_ms(50);
  /* Generate Restart */
  SET_BIT(hi2c->Instance->CR1, I2C_CR1_START);

  /* Wait until SB flag is set */
  if (I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_SB, RESET, Timeout, Tickstart) != HAL_OK)
  {
    if (hi2c->Instance->CR1 & I2C_CR1_START)
    {
      hi2c->ErrorCode = HAL_I2C_WRONG_START;
    }
    return HAL_TIMEOUT;
  }

  /* Send slave address */
  hi2c->Instance->DR = I2C_7BIT_ADD_READ(DevAddress);

  /* Wait until ADDR flag is set */
  if (I2C_WaitOnMasterAddressFlagUntilTimeout(hi2c, I2C_FLAG_ADDR, Timeout, Tickstart) != HAL_OK)
  {
    return HAL_ERROR;
  }

  return HAL_OK;
}

static HAL_StatusTypeDef I2C_WaitOnRXNEFlagUntilTimeout(I2C_HandleTypeDef *hi2c, uint32_t Timeout, uint32_t Tickstart)
{

  while (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_RXNE) == RESET)
  {
    /* Check if a STOPF is detected */
    if (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_STOPF) == SET)
    {
      /* Clear STOP Flag */
      __HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_STOPF);

      hi2c->PreviousState       = ((uint32_t)(HAL_I2C_MODE_NONE));
      hi2c->State               = HAL_I2C_STATE_READY;
      hi2c->Mode                = HAL_I2C_MODE_NONE;
      hi2c->ErrorCode           |= HAL_I2C_ERROR_NONE;

      /* Process Unlocked */
      __HAL_UNLOCK(hi2c);

      return HAL_ERROR;
    }

    /* Check for the Timeout */
    if (((HAL_GetTick() - Tickstart) > Timeout) || (Timeout == 0U))
    {
      hi2c->PreviousState       = ((uint32_t)(HAL_I2C_MODE_NONE));
      hi2c->State               = HAL_I2C_STATE_READY;
      hi2c->Mode                = HAL_I2C_MODE_NONE;
      hi2c->ErrorCode           |= HAL_I2C_ERROR_TIMEOUT;

      /* Process Unlocked */
      __HAL_UNLOCK(hi2c);

      return HAL_ERROR;
    }
  }
  return HAL_OK;
}

static HAL_StatusTypeDef HAL_I2C_Mem_Read(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint16_t MemAddress, uint16_t MemAddSize, uint8_t *pData, uint16_t Size, uint32_t Timeout)
{
  /* Init tickstart for timeout management*/
  uint32_t tickstart = HAL_GetTick();

  /* Check the parameters */
  assert_param(IS_I2C_MEMADD_SIZE(MemAddSize));

  if (hi2c->State == HAL_I2C_STATE_READY)
  {
    /* Wait until BUSY flag is reset */
    if (I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BUSY, SET, 25U, tickstart) != HAL_OK)
    {
      return HAL_BUSY;
    }

    /* Process Locked */
    __HAL_LOCK(hi2c);

    /* Check if the I2C is already enabled */
    if ((hi2c->Instance->CR1 & I2C_CR1_PE) != I2C_CR1_PE)
    {
      /* Enable I2C peripheral */
      __HAL_I2C_ENABLE(hi2c);
    }

    /* Disable Pos */
    CLEAR_BIT(hi2c->Instance->CR1, I2C_CR1_POS);

    hi2c->State     = HAL_I2C_STATE_BUSY_RX;
    hi2c->Mode      = HAL_I2C_MODE_MEM;
    hi2c->ErrorCode = HAL_I2C_ERROR_NONE;

    /* Prepare transfer parameters */
    hi2c->pBuffPtr    = pData;
    hi2c->XferCount   = Size;
    hi2c->XferSize    = hi2c->XferCount;
    hi2c->XferOptions = 0xFFFF0000U;

    /* Send Slave Address and Memory Address */
    if (I2C_RequestMemoryRead(hi2c, DevAddress, MemAddress, MemAddSize, Timeout, tickstart) != HAL_OK)
    {
      return HAL_ERROR;
    }

    if (hi2c->XferSize == 0U)
    {
      /* Clear ADDR flag */
      __HAL_I2C_CLEAR_ADDRFLAG(hi2c);

      /* Generate Stop */
      SET_BIT(hi2c->Instance->CR1, I2C_CR1_STOP);
    }
    else if (hi2c->XferSize == 1U)
    {
      /* Disable Acknowledge */
      CLEAR_BIT(hi2c->Instance->CR1, I2C_CR1_ACK);

      /* Clear ADDR flag */
      __HAL_I2C_CLEAR_ADDRFLAG(hi2c);

      /* Generate Stop */
      SET_BIT(hi2c->Instance->CR1, I2C_CR1_STOP);
    }
    else if (hi2c->XferSize == 2U)
    {
      /* Disable Acknowledge */
      CLEAR_BIT(hi2c->Instance->CR1, I2C_CR1_ACK);

      /* Enable Pos */
      SET_BIT(hi2c->Instance->CR1, I2C_CR1_POS);

      /* Clear ADDR flag */
      __HAL_I2C_CLEAR_ADDRFLAG(hi2c);
    }
    else
    {
      /* Clear ADDR flag */
      __HAL_I2C_CLEAR_ADDRFLAG(hi2c);
    }

    while (hi2c->XferSize > 0U)
    {
      if (hi2c->XferSize <= 3U)
      {
        /* One byte */
        if (hi2c->XferSize == 1U)
        {
          /* Wait until RXNE flag is set */
          if (I2C_WaitOnRXNEFlagUntilTimeout(hi2c, Timeout, tickstart) != HAL_OK)
          {
            return HAL_ERROR;
          }

          /* Read data from DR */
          *hi2c->pBuffPtr = (uint8_t)hi2c->Instance->DR;

          /* Increment Buffer pointer */
          hi2c->pBuffPtr++;

          /* Update counter */
          hi2c->XferSize--;
          hi2c->XferCount--;
        }
        /* Two bytes */
        else if (hi2c->XferSize == 2U)
        {
          /* Wait until BTF flag is set */
          if (I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BTF, RESET, Timeout, tickstart) != HAL_OK)
          {
            return HAL_ERROR;
          }

          /* Generate Stop */
          SET_BIT(hi2c->Instance->CR1, I2C_CR1_STOP);

          /* Read data from DR */
          *hi2c->pBuffPtr = (uint8_t)hi2c->Instance->DR;

          /* Increment Buffer pointer */
          hi2c->pBuffPtr++;

          /* Update counter */
          hi2c->XferSize--;
          hi2c->XferCount--;

          /* Read data from DR */
          *hi2c->pBuffPtr = (uint8_t)hi2c->Instance->DR;

          /* Increment Buffer pointer */
          hi2c->pBuffPtr++;

          /* Update counter */
          hi2c->XferSize--;
          hi2c->XferCount--;
        }
        /* 3 Last bytes */
        else
        {
          /* Wait until BTF flag is set */
          if (I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BTF, RESET, Timeout, tickstart) != HAL_OK)
          {
            return HAL_ERROR;
          }

          /* Disable Acknowledge */
          CLEAR_BIT(hi2c->Instance->CR1, I2C_CR1_ACK);

          /* Read data from DR */
          *hi2c->pBuffPtr = (uint8_t)hi2c->Instance->DR;

          /* Increment Buffer pointer */
          hi2c->pBuffPtr++;

          /* Update counter */
          hi2c->XferSize--;
          hi2c->XferCount--;

          /* Wait until BTF flag is set */
          if (I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BTF, RESET, Timeout, tickstart) != HAL_OK)
          {
            return HAL_ERROR;
          }

          /* Generate Stop */
          SET_BIT(hi2c->Instance->CR1, I2C_CR1_STOP);

          /* Read data from DR */
          *hi2c->pBuffPtr = (uint8_t)hi2c->Instance->DR;

          /* Increment Buffer pointer */
          hi2c->pBuffPtr++;

          /* Update counter */
          hi2c->XferSize--;
          hi2c->XferCount--;

          /* Read data from DR */
          *hi2c->pBuffPtr = (uint8_t)hi2c->Instance->DR;

          /* Increment Buffer pointer */
          hi2c->pBuffPtr++;

          /* Update counter */
          hi2c->XferSize--;
          hi2c->XferCount--;
        }
      }
      else
      {
        /* Wait until RXNE flag is set */
        if (I2C_WaitOnRXNEFlagUntilTimeout(hi2c, Timeout, tickstart) != HAL_OK)
        {
          return HAL_ERROR;
        }

        /* Read data from DR */
        *hi2c->pBuffPtr = (uint8_t)hi2c->Instance->DR;

        /* Increment Buffer pointer */
        hi2c->pBuffPtr++;

        /* Update counter */
        hi2c->XferSize--;
        hi2c->XferCount--;

        if (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_BTF) == SET)
        {
          /* Read data from DR */
          *hi2c->pBuffPtr = (uint8_t)hi2c->Instance->DR;

          /* Increment Buffer pointer */
          hi2c->pBuffPtr++;

          /* Update counter */
          hi2c->XferSize--;
          hi2c->XferCount--;
        }
      }
    }

    hi2c->State = HAL_I2C_STATE_READY;
    hi2c->Mode = HAL_I2C_MODE_NONE;

    /* Process Unlocked */
    __HAL_UNLOCK(hi2c);

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}