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Код: Выделить всё

void USART1_IRQHandler()
{
    uint32_t sr = USART1->SR;
    if (sr & USART_SR_TXE)                      // Transmit data register empty
    {                                        
        USART1->DR = *tx_buffer++;              // Send data
        tx_size--;
        if (tx_size == 0)
        {
            USART1->CR1 &= ~USART_CR1_TXEIE;    // Disable TXE interrupt
        }
    }
}

Код: Выделить всё

  /*  Transmit data register empty  */ 
  if ((LL_USART_IsActiveFlag_TXE(USARTx) != RESET) && (LL_USART_IsEnabledIT_TXE(USARTx) != RESET))
  {
    /* To prevent the TC flag bit from being affected by other operations during
       data transmission, read the SR register in conjunction with write the DR 
       Register to clear the TC flag bit.
    */
    (void)(USARTx->SR);
    LL_USART_TransmitData8(USARTx, *TxBuff);
    TxBuff++;
    if (--TxCount == 0U)
    { 
        LL_USART_DisableIT_TXE(USARTx);
        
        LL_USART_EnableIT_TC(USARTx);
    }
    return;
  }
  
  /*  Transmission complete  */
  if ((LL_USART_IsActiveFlag_TC(USARTx) != RESET) && (LL_USART_IsEnabledIT_TC(USARTx) != RESET))
  {
    LL_USART_DisableIT_TC(USARTx);
    UartReady = SET;
  
    return;
  }

Код: Выделить всё

void USART1_IRQHandler()
{
  uint32_t sr = USART1->SR;
  if (sr & USART_SR_TXE)
  {
    if (tx_size > 0)
    {
      USART1->DR = *tx_buffer++;
      tx_size--;
      if (tx_size == 0)
      {
        USART1->CR1 &= ~USART_CR1_TXEIE;
        USART1->CR1 |= USART_CR1_TCIE;
      }
    }
  }

  if (sr & USART_SR_TC)
  {
    USART1->SR &= ~USART_SR_TC;
    USART1->CR1 &= ~USART_CR1_TCIE;
  }
}