RT-Thread一般讨论

uart中断使能

发布于 2019-07-31 16:58:10 浏览：1484 订阅该版

* 本帖最后由 aichip-sai 于 2019-7-31 16:59 编辑 *

串口调试的过程中遇到如下问题：
void uart_irq_register(uart_device_number_t channel, uart_interrupt_mode_t interrupt_mode, plic_irq_callback_t uart_callback, void *ctx, uint32_t priority)
{
    if(interrupt_mode == UART_SEND)
    {
        uart[channel]->IER |= 0x2;
        g_uart_instance[channel].uart_send_instance.callback = uart_callback;
        g_uart_instance[channel].uart_send_instance.ctx = ctx;
    } else if(interrupt_mode == UART_RECEIVE)
    {
        uart[channel]->IER |= 0x1;
        g_uart_instance[channel].uart_receive_instance.callback = uart_callback;
        g_uart_instance[channel].uart_receive_instance.ctx = ctx;
    }
    g_uart_instance[channel].uart_num = channel;
    plic_set_priority(IRQN_UART1_INTERRUPT + channel, priority);
    plic_irq_register(IRQN_UART1_INTERRUPT + channel, uart_irq_callback, &g_uart_instance[channel]);
    plic_irq_enable(IRQN_UART1_INTERRUPT + channel);
}
1、这个函数中的uart_callback参数为NULL，系统就起不来了，为何？
2、这个中断注册函数注册的callback和rt_hw_interrupt_install(uart->irqno, uart_irq_handler,serial, serial->parent.parent.name)函数中的uart_irq_handler有什么关
联，哪一个函数是进中断要调用的函数呢？
3、要想串口能进入中断，需要调用uart_irq_register使能中断，只调用rt_device_open(client->device, RT_DEVICE_FLAG_INT_TX | RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_DMA_RX)
不起作用，为何？请大神指教？谢谢！