使用f103的I2C外设，不使能使用，即不用I2C_Cmd也可以？为什么啊？

只看该作者 · 2019-10-30 15:58

main.c
#include &quot;stm32f10x.h&quot;
#include &quot;bsp_usart.h&quot;
#include &quot;bsp_i2c.h&quot;

int main(void)
{
      uint8_t readData[20]={0};
      uint8_t writeData[8]={4,5,6,7,8,9,10,11};
      uint8_t i=0;
      USART_Config();
  I2C_EE_Config();

      //发送一个字符串
      printf(&quot;这是一个I2C通讯实验\n&quot;);

      //写入一串数据
      EEPROM_Page_Write(0,writeData,8);
      //等待写入操作完成
  EEPROM_WaitForWriteEnd();

      //读取数据
      EEPROM_Read(0,readData,8);

      for(i=0;i<8;i++)
      {
         printf(&quot;%d &quot;,readData);  //%x为16进制输出
      }
      printf(&quot;\n&quot;);

while(1)
{}
}

bsp_i2c.c
#include &quot;bsp_i2c.h&quot;

void I2C_EE_Config(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      I2C_InitTypeDef I2C_InitStructure;
      //打开IIC GPIO的时钟
      EEPROM_I2C_GPIO_APBxClkCmd(EEPROM_I2C_SCL_GPIO_CLK,ENABLE);
      //打开IIC外设的时钟
      EEPROM_I2C_APBxClkCmd(EEPROM_I2C_CLK,ENABLE);
      //将I2C的GPIO配置为推挽复用模式
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
      GPIO_InitStructure.GPIO_Pin = EEPROM_I2C_SCL_GPIO_PIN;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(EEPROM_I2C_SCL_GPIO_PORT ,&GPIO_InitStructure);

      GPIO_InitStructure.GPIO_Pin = EEPROM_I2C_SDA_GPIO_PIN;
      GPIO_Init(EEPROM_I2C_SCL_GPIO_PORT ,&GPIO_InitStructure);

      //配置I2C的工作参数
      I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;//使能应答
      I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
      I2C_InitStructure.I2C_ClockSpeed = EEPROM_I2_BAUDRATE;
      I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
      I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
      I2C_InitStructure.I2C_OwnAddress1 = STM32_I2C_OWN_ADDR;

      I2C_Init(EEPROM_I2C,&I2C_InitStructure);
      //I2C_Cmd(EEPROM_I2C,ENABLE);
}

//从EEPROM读取数据
void EEPROM_Read(uint8_t addr,uint8_t *data,uint8_t numByteToRead)
{
      //产生起始信号
      I2C_GenerateSTART(EEPROM_I2C, ENABLE);
      while(I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_MODE_SELECT) != SUCCESS);
      //EV5事件被检测到，发送设备地址
      I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDR,I2C_Direction_Transmitter);

      while(I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) != SUCCESS);
  //EV6事件被检测到，发送要操作的存储单元地址
      I2C_SendData(EEPROM_I2C, addr);
      while(I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTING) != SUCCESS);

      //第二次起始信号
      //产生起始信号
      I2C_GenerateSTART(EEPROM_I2C, ENABLE);
      while(I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_MODE_SELECT) != SUCCESS);
      //EV5事件被检测到，发送设备地址
      I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDR,I2C_Direction_Receiver);

      while(I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) != SUCCESS);

      while(numByteToRead)
      {

      if(numByteToRead==1)
      {
      //如果为最后一个字节
      I2C_AcknowledgeConfig(EEPROM_I2C, DISABLE);

      }
      //EV7事件被检测到
      while(I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_RECEIVED) != SUCCESS);
  //EV7事件被检测到，即数据寄存器有新的有效数据

      *data=I2C_ReceiveData(EEPROM_I2C);
      data++;
      numByteToRead--;
      }

      //数据传输完成
      I2C_GenerateSTOP(EEPROM_I2C, ENABLE);
      //重新配置ACK使能，以便下次通讯
      I2C_AcknowledgeConfig(EEPROM_I2C, ENABLE);
}

//等待EEPROM内部时序完成
void EEPROM_WaitForWriteEnd(void)
{
      do{
      //产生起始信号
      I2C_GenerateSTART(EEPROM_I2C, ENABLE);
      while(I2C_GetFlagStatus(EEPROM_I2C,I2C_FLAG_SB) != SET);
      //EV5事件被检测到，发送设备地址
      I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDR,I2C_Direction_Transmitter);
      }
      while(I2C_GetFlagStatus(EEPROM_I2C, I2C_FLAG_ADDR) != SET);
      //内部时序完成
      I2C_GenerateSTOP(EEPROM_I2C, ENABLE);
}

//向EEPROM写入多个字节（页写入），小于八个字节
void EEPROM_Page_Write(uint8_t addr,uint8_t *data,uint8_t numByteToWrite)
{
      //产生起始信号
      I2C_GenerateSTART(EEPROM_I2C, ENABLE);
      while(I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_MODE_SELECT) != SUCCESS);
      //EV5事件被检测到，发送设备地址
      I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDR,I2C_Direction_Transmitter);

      while(I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) != SUCCESS);
  //EV6事件被检测到，发送要操作的存储单元地址
      I2C_SendData(EEPROM_I2C, addr);
      //while(I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTING) != SUCCESS);

      while(numByteToWrite)
      {
         while(I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTING) != SUCCESS);
               //EV8事件被检测到，发送要存储的数据
         I2C_SendData(EEPROM_I2C, *data);
         //while(I2C_CheckEvent(EEPROM_I2C,I2C_EVENT_MASTER_BYTE_TRANSMITTED) != SUCCESS);
               data++;
               numByteToWrite--;
      }
      while(I2C_CheckEvent(EEPROM_I2C,I2C_EVENT_MASTER_BYTE_TRANSMITTED) != SUCCESS);
      //数据传输完成
      I2C_GenerateSTOP(EEPROM_I2C, ENABLE);
}

使用f103的I2C外设，不使能使用，即不用I2C_Cmd也可以？为什么啊？

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