STM32F0xx芯片的USART配置

备份一下关于UASRT的相关函数，USART1的寄存器用法：

/* USART1 init function */
static void MX_USART1_UART_Init(void)
{
    /* Enable the peripheral clock of GPIOA */
    RCC->AHBENR |= RCC_AHBENR_GPIOAEN;

    /* GPIO configuration for USART1 signals */
    /* (1) Select AF mode (10) on PA9 and PA10 */
    /* (2) AF1 for USART1 signals */
    GPIOA->MODER = (GPIOA->MODER & ~(GPIO_MODER_MODER9|GPIO_MODER_MODER10))\
           | (GPIO_MODER_MODER9_1 | GPIO_MODER_MODER10_1); /* (1) */
    GPIOA->AFR[1] = (GPIOA->AFR[1] &~ (GPIO_AFRH_AFRH1 | GPIO_AFRH_AFRH2))\
          | (1 << (1 * 4)) | (1 << (2 * 4)); /* (2) */

    /* Enable the peripheral clock USART1 */
    RCC->APB2ENR |= RCC_APB2ENR_USART1EN;

    /* Configure USART1 */
    /* (1) oversampling by 16, 38400 baud */
    /* (2) 8 data bit, 1 start bit, 1 stop bit, no parity, reception mode */
    USART1->BRR = 48000000 / 38400;
    USART1->CR1 = USART_CR1_RXNEIE | USART_CR1_RE | USART_CR1_TE | USART_CR1_UE; /* (2) */

    /* Configure IT */
    /* (3) Set priority for USART1_IRQn */
    /* (4) Enable USART1_IRQn */
    NVIC_SetPriority(USART1_IRQn, 3); /* (3) */
    //NVIC_EnableIRQ(USART1_IRQn); /* (4) */
}

 

LL库的函数用法：

/* USART1 init function */
static void MX_USART1_UART_Init(void)
{
  LL_USART_InitTypeDef USART_InitStruct;

  LL_GPIO_InitTypeDef GPIO_InitStruct;

  /* Peripheral clock enable */
  LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_USART1);

  /**USART1 GPIO Configuration
  PA9   ------> USART1_TX
  PA10   ------> USART1_RX
  */
  GPIO_InitStruct.Pin = COM_TX_Pin;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_UP;
  GPIO_InitStruct.Alternate = LL_GPIO_AF_1;
  LL_GPIO_Init(COM_TX_GPIO_Port, &GPIO_InitStruct);

  GPIO_InitStruct.Pin = COM_RX_Pin;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_UP;
  GPIO_InitStruct.Alternate = LL_GPIO_AF_1;
  LL_GPIO_Init(COM_RX_GPIO_Port, &GPIO_InitStruct);

  USART_InitStruct.BaudRate = 38400;
  USART_InitStruct.DataWidth = LL_USART_DATAWIDTH_8B;
  USART_InitStruct.StopBits = LL_USART_STOPBITS_1;
  USART_InitStruct.Parity = LL_USART_PARITY_NONE;
  USART_InitStruct.TransferDirection = LL_USART_DIRECTION_TX_RX;
  USART_InitStruct.HardwareFlowControl = LL_USART_HWCONTROL_NONE;
  USART_InitStruct.OverSampling = LL_USART_OVERSAMPLING_16;
  LL_USART_Init(USART1, &USART_InitStruct);

  LL_USART_DisableIT_CTS(USART1);

  LL_USART_DisableOverrunDetect(USART1);

  LL_USART_ConfigAsyncMode(USART1);

  LL_USART_Enable(USART1);
}

 

中断函数，数据存到队列中：

/* Irq */
void USART1_IRQHandler(void)
{
    static uint8 tmp;

    if((USART1->ISR & USART_ISR_PE) == USART_ISR_PE)
    {
        tmp = (uint8)(USART1->RDR);
        USART1->ICR |= USART_ICR_PECF;
    }

    if((USART1->ISR & USART_ISR_FE) == USART_ISR_FE)
    {
        tmp = (uint8)(USART1->RDR);
        USART1->ICR |= USART_ICR_FECF;
    }

    if((USART1->ISR & USART_ISR_ORE) == USART_ISR_ORE)
    {
        tmp = (uint8)(USART1->RDR);
        USART1->ICR |= USART_ICR_ORECF;
    }

    if((USART1->ISR & USART_ISR_RXNE) == USART_ISR_RXNE)
    {
        tmp = (uint8_t)(USART1->RDR);
        xQueueSendToBackFromISR(xQueueRxFromHost, &tmp, NULL);
    }
}