【GD32F310G-START】USART 不定长接收

lugl4313820

【GD32F310G-START】USART 不定长接收 [复制链接]

【前言】前面有网友说进不了中断IDLE，这里附上工程，希望对他有帮助：

1、配置usart0:

void usart_config(void)
{
    /* enable GPIO clock */
    rcu_periph_clock_enable(RCU_GPIOA);

    /* enable USART clock */
    rcu_periph_clock_enable(RCU_USART0);

    /* connect port to USART0 tx */
    gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_9);

    /* connect port to USART0 rx */
    gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_10);

    /* configure USART tx as alternate function push-pull */
    gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_9);
    gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, GPIO_PIN_9);

    /* configure USART rx as alternate function push-pull */
    gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_10);
    gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, GPIO_PIN_10);

    /* configure USART */
    usart_deinit(USART0);
    usart_baudrate_set(USART0, 115200U);
    usart_receive_config(USART0, USART_RECEIVE_ENABLE);
    usart_transmit_config(USART0, USART_TRANSMIT_ENABLE);
    usart_dma_receive_config(USART0, USART_DENR_ENABLE);
    usart_dma_transmit_config(USART0, USART_DENT_ENABLE);
    usart_enable(USART0);
}

2、开启中断：

/*!
    \brief      configure NVIC
    \param[in]  none
    \param[out] none
    \retval     none
*/
void nvic_config(void)
{
    nvic_irq_enable(USART0_IRQn, 0, 0);
}

3、配置DMA

void dma_config(void)
{
    dma_parameter_struct dma_init_struct;

    rcu_periph_clock_enable(RCU_DMA);

    /* deinitialize DMA channel2 (USART0 rx) */
    dma_deinit(DMA_CH2);
    dma_struct_para_init(&dma_init_struct);
    dma_init_struct.direction = DMA_PERIPHERAL_TO_MEMORY;
    dma_init_struct.memory_addr = (uint32_t)rxbuffer;
    dma_init_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
    dma_init_struct.memory_width = DMA_MEMORY_WIDTH_8BIT;
    dma_init_struct.number = 256;
    dma_init_struct.periph_addr = (uint32_t)&USART_RDATA(USART0);
    dma_init_struct.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
    dma_init_struct.periph_width = DMA_PERIPHERAL_WIDTH_8BIT;
    dma_init_struct.priority = DMA_PRIORITY_ULTRA_HIGH;
    dma_init(DMA_CH2, &dma_init_struct);
    /* configure DMA mode */
    dma_circulation_disable(DMA_CH2);
    /* enable DMA channel2 */
    dma_channel_enable(DMA_CH2);
}

4、书写中断接收函数：

/*!
    \brief      this function handles USART RBNE interrupt request and TBE interrupt request
    \param[in]  none
    \param[out] none
    \retval     none
*/
void USART0_IRQHandler(void)
{
    if(RESET != usart_interrupt_flag_get(USART0, USART_INT_FLAG_IDLE)) {
        /* clear IDLE flag */
        usart_interrupt_flag_clear(USART0, USART_INT_FLAG_IDLE);
        /* toggle the LED2 */
        gd_eval_led_toggle();

        /* number of data received */
        rx_count = 256 - (dma_transfer_number_get(DMA_CH2));
        receive_flag = 1;

        /* disable DMA and reconfigure */
        dma_channel_disable(DMA_CH2);
        dma_transfer_number_config(DMA_CH2, 256);
        dma_channel_enable(DMA_CH2);
    }
}

5、main函数：

int main(void)
{
    gd_eval_led_init();
    gd_eval_led_on();
    nvic_config();

    /* initialize DMA */
    dma_config();

    /* initialize USART */
    usart_config();

    /* wait IDLEF set and clear it */
    while(RESET == usart_flag_get(USART0, USART_FLAG_IDLE));
    usart_flag_clear(USART0, USART_FLAG_IDLE);
    usart_interrupt_enable(USART0, USART_INT_IDLE);
    /* wait the data is received and send to the hyperterminal */
    while(1) {
        if(1 == receive_flag) {
            for(tx_count = 0; tx_count < rx_count; tx_count++) {
                while(RESET == usart_flag_get(USART0, USART_FLAG_TBE));
                usart_data_transmit(USART0, rxbuffer[tx_count]);
            }
            receive_flag = 0;
        }
    }
}

6、实验效果：

 

okhxyyo

谢谢分享，很用心呀

lugl4313820

okhxyyo 发表于 2022-6-16 22:37 谢谢分享，很用心呀

感谢呀，非常感谢检查！

还是叫我超人吧

串口配置里面 IDIE没使能，这条语句能实现吗？if(RESET != usart_interrupt_flag_get(USART0, USART_INT_FLAG_IDLE))