stm32f10x_i2c.c

stm32f10xx的中文译文例程

/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* 文件名称: stm32f10x_i2c.c
* 程序作者: MCD Application Team
* 程序版本: V2.0.2
* 编制日期: 07/11/2008
* 功能描述: 这个文件提供了所有I2C的固件函数.
* 本文汉化: 孙可 2008.08.15
********************************************************************************
* 目前的固件的目的是为客户提供关于他们的产品的编码信息以便于节省他们时间。
* 结果, 意法半导体将不会为此承担任何直接，间接或相应的损害赔偿方面的任何索赔要求，
* 例如固件或使用所作的客户编码中他涉嫌包含与他们的相关产品的信息。
*******************************************************************************/

/* 包涵的文件 ------------------------------------------------------------------*/
#include "stm32f10x_i2c.h"
#include "stm32f10x_rcc.h"
     
/* 自用类型 -----------------------------------------------------------*/
/* 自用定义 ------------------------------------------------------------*/
/* I2C SPE mask */
#define CR1_PE_Set              ((u16)0x0001)
#define CR1_PE_Reset            ((u16)0xFFFE)

/* I2C START mask */
#define CR1_START_Set           ((u16)0x0100)
#define CR1_START_Reset         ((u16)0xFEFF)

/* I2C STOP mask */
#define CR1_STOP_Set            ((u16)0x0200)
#define CR1_STOP_Reset          ((u16)0xFDFF)

/* I2C ACK mask */
#define CR1_ACK_Set             ((u16)0x0400)
#define CR1_ACK_Reset           ((u16)0xFBFF)

/* I2C ENGC mask */
#define CR1_ENGC_Set            ((u16)0x0040)
#define CR1_ENGC_Reset          ((u16)0xFFBF)

/* I2C SWRST mask */
#define CR1_SWRST_Set           ((u16)0x8000)
#define CR1_SWRST_Reset         ((u16)0x7FFF)

/* I2C PEC mask */
#define CR1_PEC_Set             ((u16)0x1000)
#define CR1_PEC_Reset           ((u16)0xEFFF)

/* I2C ENPEC mask */
#define CR1_ENPEC_Set           ((u16)0x0020)
#define CR1_ENPEC_Reset         ((u16)0xFFDF)

/* I2C ENARP mask */
#define CR1_ENARP_Set           ((u16)0x0010)
#define CR1_ENARP_Reset         ((u16)0xFFEF)

/* I2C NOSTRETCH mask */
#define CR1_NOSTRETCH_Set       ((u16)0x0080)
#define CR1_NOSTRETCH_Reset     ((u16)0xFF7F)

/* I2C registers Masks */
#define CR1_CLEAR_Mask          ((u16)0xFBF5)

/* I2C DMAEN mask */
#define CR2_DMAEN_Set           ((u16)0x0800)
#define CR2_DMAEN_Reset         ((u16)0xF7FF)

/* I2C LAST mask */
#define CR2_LAST_Set            ((u16)0x1000)
#define CR2_LAST_Reset          ((u16)0xEFFF)

/* I2C FREQ mask */
#define CR2_FREQ_Reset          ((u16)0xFFC0)

/* I2C ADD0 mask */
#define OAR1_ADD0_Set           ((u16)0x0001)
#define OAR1_ADD0_Reset         ((u16)0xFFFE)

/* I2C ENDUAL mask */
#define OAR2_ENDUAL_Set         ((u16)0x0001)
#define OAR2_ENDUAL_Reset       ((u16)0xFFFE)

/* I2C ADD2 mask */
#define OAR2_ADD2_Reset         ((u16)0xFF01)

/* I2C F/S mask */
#define CCR_FS_Set              ((u16)0x8000)

/* I2C CCR mask */
#define CCR_CCR_Set             ((u16)0x0FFF)

/* I2C FLAG mask */
#define FLAG_Mask               ((u32)0x00FFFFFF)

/* I2C Interrupt Enable mask */
#define ITEN_Mask               ((u32)0x07000000)

/* 自用宏 -------------------------------------------------------------*/
/* 自用变量 ---------------------------------------------------------*/
/* 自用函数原型 -----------------------------------------------*/
/* 自用函数 ---------------------------------------------------------*/

/*******************************************************************************
* 函数名称: I2C_DeInit
* 功能描述: 将I2Cx外设寄存器复位到它们的默认值.
* 输入参数: I2Cx：x可为1或2来选择I2C外设.
* 输出参数: 无
* 返回参数: 无
*******************************************************************************/
void I2C_DeInit(I2C_TypeDef* I2Cx)
{
  /* Check the parameters [检查参数]*/
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));

  switch (*(u32*)&I2Cx)
  {
    case I2C1_BASE:
      /* Enable I2C1 reset state [允许I2C1复位状态]*/
      RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
      /* Release I2C1 from reset state [解除I2C1复位状态]*/
      RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
      break;

    case I2C2_BASE:
      /* Enable I2C2 reset state [允许I2C2复位状态]*/
      RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
      /* Release I2C2 from reset state [解除I2C2复位状态]*/
      RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
      break;

    default:
      break;
  }
}

/*******************************************************************************
* 函数名称: I2C_Init
* 功能描述: 按照I2C_InitStruct的特定参数初始化I2C部件.
* 输入参数: (1)I2Cx：x可为1或2来选择I2C部件.
*           (2)I2C_InitStruct：指向I2C_InitTypeDef结构，该结构包含了特定I2C部件的配置信息。
* 输出参数: 无
* 返回参数: 无
******************************************************************************/
void I2C_Init(I2C_TypeDef* I2Cx, I2C_InitTypeDef* I2C_InitStruct)
{
  u16 tmpreg = 0, freqrange = 0;
  u16 result = 0x04;
  u32 pclk1 = 8000000;
  RCC_ClocksTypeDef  rcc_clocks;

  /* Check the parameters [检查参数]*/
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  assert_param(IS_I2C_MODE(I2C_InitStruct->I2C_Mode));
  assert_param(IS_I2C_DUTY_CYCLE(I2C_InitStruct->I2C_DutyCycle));
  assert_param(IS_I2C_OWN_ADDRESS1(I2C_InitStruct->I2C_OwnAddress1));
  assert_param(IS_I2C_ACK_STATE(I2C_InitStruct->I2C_Ack));
  assert_param(IS_I2C_ACKNOWLEDGE_ADDRESS(I2C_InitStruct->I2C_AcknowledgedAddress));
  assert_param(IS_I2C_CLOCK_SPEED(I2C_InitStruct->I2C_ClockSpeed));

/*---------------------------- I2Cx CR2 Configuration ------------------------*/
  /* Get the I2Cx CR2 value */
  tmpreg = I2Cx->CR2;
  /* Clear frequency FREQ[5:0] bits */
  tmpreg &= CR2_FREQ_Reset;
  /* Get pclk1 frequency value */
  RCC_GetClocksFreq(&rcc_clocks);
  pclk1 = rcc_clocks.PCLK1_Frequency;
  /* Set frequency bits depending on pclk1 value */
  freqrange = (u16)(pclk1 / 1000000);
  tmpreg |= freqrange;
  /* Write to I2Cx CR2 */
  I2Cx->CR2 = tmpreg;

/*---------------------------- I2Cx CCR Configuration ------------------------*/
  /* Disable the selected I2C peripheral to configure TRISE */
  I2Cx->CR1 &= CR1_PE_Reset;

  /* Reset tmpreg value */
  /* Clear F/S, DUTY and CCR[11:0] bits */
  tmpreg = 0;

  /* Configure speed in standard mode */
  if (I2C_InitStruct->I2C_ClockSpeed <= 100000)
  {
    /* Standard mode speed calculate */
    result = (u16)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed << 1));
    /* Test if CCR value is under 0x4*/
    if (result < 0x04)
    {
      /* Set minimum allowed value */
      result = 0x04;  
    }
    /* Set speed value for standard mode */
    tmpreg |= result;     
    /* Set Maximum Rise Time for standard mode */
    I2Cx->TRISE = freqrange + 1; 
  }
  /* Configure speed in fast mode */
  else /*(I2C_InitStruct->I2C_ClockSpeed <= 400000)*/
  {
    if (I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_2)
    {
      /* Fast mode speed calculate: Tlow/Thigh = 2 */
      result = (u16)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 3));
    }
    else /*I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_16_9*/
    {
      /* Fast mode speed calculate: Tlow/Thigh = 16/9 */
      result = (u16)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 25));
      /* Set DUTY bit */
      result |= I2C_DutyCycle_16_9;
    }
    /* Test if CCR value is under 0x1*/
    if ((result & CCR_CCR_Set) == 0)
    {
      /* Set minimum allowed value */
      result |= (u16)0x0001;  
    }
    /* Set speed value and set F/S bit for fast mode */
    tmpreg |= result | CCR_FS_Set;
    /* Set Maximum Rise Time for fast mode */
    I2Cx->TRISE = (u16)(((freqrange * 300) / 1000) + 1);  
  }
  /* Write to I2Cx CCR */
  I2Cx->CCR = tmpreg;

  /* Enable the selected I2C peripheral */
  I2Cx->CR1 |= CR1_PE_Set;

/*---------------------------- I2Cx CR1 Configuration ------------------------*/
  /* Get the I2Cx CR1 value */
  tmpreg = I2Cx->CR1;
  /* Clear ACK, SMBTYPE and  SMBUS bits */
  tmpreg &= CR1_CLEAR_Mask;
  /* Configure I2Cx: mode and acknowledgement */
  /* Set SMBTYPE and SMBUS bits according to I2C_Mode value */
  /* Set ACK bit according to I2C_Ack value */
  tmpreg |= (u16)((u32)I2C_InitStruct->I2C_Mode | I2C_InitStruct->I2C_Ack);
  /* Write to I2Cx CR1 */
  I2Cx->CR1 = tmpreg;

/*---------------------------- I2Cx OAR1 Configuration -----------------------*/
  /* Set I2Cx Own Address1 and acknowledged address */
  I2Cx->OAR1 = (I2C_InitStruct->I2C_AcknowledgedAddress | I2C_InitStruct->I2C_OwnAddress1);
}

/*******************************************************************************
* 函数名称: I2C_StructInit
* 功能描述: 为I2C_InitStruct的成员赋默认值.
* 输入参数: I2C_InitStruct：指向必须初始化的I2C_InitTypeDef结构.
* 输出参数: 无
* 返回参数: 无
*******************************************************************************/
void I2C_StructInit(I2C_InitTypeDef* I2C_InitStruct)
{
/*---------------- Reset I2C init structure parameters values ----------------*/
  /* Initialize the I2C_Mode member */
  I2C_InitStruct->I2C_Mode = I2C_Mode_I2C;

  /* Initialize the I2C_DutyCycle member */
  I2C_InitStruct->I2C_DutyCycle = I2C_DutyCycle_2;

  /* Initialize the I2C_OwnAddress1 member */
  I2C_InitStruct->I2C_OwnAddress1 = 0;

  /* Initialize the I2C_Ack member */
  I2C_InitStruct->I2C_Ack = I2C_Ack_Disable;

  /* Initialize the I2C_AcknowledgedAddress member */
  I2C_InitStruct->I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;

  /* initialize the I2C_ClockSpeed member */
  I2C_InitStruct->I2C_ClockSpeed = 5000;
}

/*******************************************************************************
* 函数名称: I2C_Cmd
* 功能描述: 使能（或禁能）特定的I2C外设.
* 输入参数: (1)I2Cx：x可为1或2来选择I2C外设.
*           (2)NewState：I2C部件的新状态.该参数可为：ENABLE或DISABLE.
* 输出参数: 无
* 返回参数: 无
*******************************************************************************/
void I2C_Cmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters [检查参数]*/
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected I2C peripheral [使能选择的I2C设备]*/
    I2Cx->CR1 |= CR1_PE_Set;
  }
  else