STM32F4 I2C DMA CMSIS - ARM, Cortex, STM32 - Ответ 15712973

void I2c1::write(uint8_t addr, uint8_t *data, uint8_t len)
{
 uint8_t i = 0; 
 while(I2C1->SR2 & I2C_SR2_BUSY);          //Wait if bus busy
 I2C1->CR1 |= I2C_CR1_START;               //Start generation
 while(!(I2C1->SR1 & I2C_SR1_SB));         //Wait start condition generated
 I2C1->DR = addr;                          //Write slave address
 while(!(I2C1->SR1 & I2C_SR1_ADDR))        //Wait send addsess
      {
           if(I2C1->SR1 & I2C_SR1_AF)          //Acknowledge failure
                 {
                    I2C1->CR1 |= I2C_CR1_STOP;       //Stop generation
                    return;
                 }
            }
 (void)I2C1->SR2;                          //Read SR2
 DMA1_Stream6->M0AR = (uint32_t)data;   
 DMA1_Stream6->NDTR = len;                 //Set len
 DMA1_Stream6->CR |= DMA_SxCR_EN;            //enable DMA
 while(DMA1_Stream6->CR & DMA_SxCR_EN);
 DMA1->HIFCR |= DMA_HIFCR_CTCIF6;   
 I2C1->CR1 |= I2C_CR1_STOP;         
}