HK32F030K6Tx 硬件I2C 从机问题

只看该作者 · 2021-2-5 14:24

源码如下
void I2C1_Init(void)
{

  I2C_InitTypeDef I2C_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  RCC_I2CCLKConfig(RCC_I2C1CLK_SYSCLK);
  RCC_APB1PeriphClockCmd(RCC_APB1ENR_I2C1EN, ENABLE);

  GPIO_InitSet(PI_DSI_HW_I2C_SCL_PIN, GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP);
  GPIO_InitSet(PI_DSI_HW_I2C_SDA_PIN, GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP);
      GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_1);
      GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_1);

  I2C_DeInit(I2C1);
  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
  I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Disable;
  I2C_InitStructure.I2C_DigitalFilter = 0; // disable
  I2C_InitStructure.I2C_Timing = 0x002105070; // 0x30E32E44
  I2C_InitStructure.I2C_OwnAddress1 = 0x70;
  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
  I2C_InitStructure.I2C_AcknowledgedAddress= I2C_AcknowledgedAddress_7bit;
  I2C_Init(I2C1, &I2C_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel       = I2C1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd    = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  I2C_ITConfig(I2C1, I2C_IT_TXIS
               | I2C_IT_RXNE
               | I2C_IT_ADDR
               | I2C_IT_NACKF
               | I2C_IT_STOPF
               | I2C_IT_TC
               | I2C_IT_BERR
               | I2C_IT_ARLO
               | I2C_IT_OVR
               | I2C_IT_PECERR
               | I2C_IT_TIMEOUT, ENABLE);
  I2C_Cmd(I2C1, ENABLE);
}

void I2C1_IRQHandler(void)
{
  volatile uint32_t ISR_Status = I2C1->ISR;
  volatile uint8_t addr = (ISR_Status >> 16) & 0xFE;

  I2C1->ICR = 0x3F38;  // clear all interrupt flag

  if((ISR_Status & I2C_ISR_ADDR) != 0) // Slave address matched
  {
  }
  else
  {
   if (addr == 0x70)
{
   if((ISR_Status & I2C_ISR_RXNE) != 0) // Data register not empt
   {
   }
   else if(( ISR_Status & I2C_ISR_STOPF) != 0) // Stop detected
   {
      I2C1->CR1 |= 0x0001;
   }
   else if( (( ISR_Status & I2C_ISR_NACKF) != 0)
      || (( ISR_Status & I2C_ISR_TC) != 0)
      || (( ISR_Status & I2C_ISR_BERR) != 0)
      || (( ISR_Status & I2C_ISR_ARLO) != 0)
      || (( ISR_Status & I2C_ISR_OVR) != 0)
      || (( ISR_Status & I2C_ISR_PECERR) != 0)
      || (( ISR_Status & I2C_ISR_TIMEOUT) != 0)
      || (( ISR_Status & I2C_ISR_TXIS) != 0)
   )
   {
   }
   if(((ISR_Status & I2C_ISR_DIR) != 0))
   {
      I2C1->TXDR = I2C1->RXDR;
   }
}
  }
}

问题现象：
程序里面设置的是在中断中直接把 RXDR中的数据发送出去，但是实际上总是有一字节的的延迟，如图中所示，
0x70是从机地址，0x03是HK32从机I2C接收的数据，直接发出去的却是0x02（之前一个字节的数据），下一个字节才变成正常的0x03,  然后又接收到 0x09的数据，第一次发送的却还是之前的0x03，下一个字节才变成 0x09

file:///C:/Users/Administrator/Desktop/2.bmp

是有什么地方配置的不正确吗？