UART DMA not worked with sleep mode.

Slacky

Hello.


I use UART with DMA - two MCUs exchange data at a speed of 19200. It is Ok.

I want to use sleep mode. But I used sleep mode, UART not worked.


Help me, please.

TL_LX

您好，睡眠唤醒之后需要重新配置接收或者发送 DMA，流程如下
  1、 disable 上一笔 DMA
  2、配置下一笔 DMA

Slacky

Hello.

I configure the uart every time after sleep.

1. void user_init(bool isRetention) {
   
2. 
   
3. #if PA_ENABLE
   
4.     rf_paInit(PA_TX, PA_RX);
   
5. #endif
   
6. 
   
7. #if PM_ENABLE
   
8.     app_wakeupPinConfig();
   
9. #endif
   
10. 
    
11.     app_uart_init();
    

复制代码

1. void app_uart_init() {
   
2. 
   
3.     flush_ring_buff();
   
4.     drv_uart_pin_set(GPIO_UART_TX, GPIO_UART_RX);
   
5. 
   
6.     drv_uart_init(BAUDRATE_UART, (uint8_t*)&rec_buff, sizeof(uart_data_t), app_uartRecvCb);
   
7. 
   
8. }

复制代码

The problem is that the chip does not wake up when data appears on the RX.

TL_LX

睡眠唤醒需要配置唤醒源，例如 PAD 唤醒，timer 唤醒，具体唤醒源的设置请参考 PM_Demo

TL_ZXD

Slacky 发表于 2024-9-19 16:31
Hello.

I configure the uart every time after sleep.

Hello, the wake source does not have uart at the moment. Try using GPIO to wake up. For example, RX is high when idle, and will be low when sending the start bit, so you can try to use the low level or falling edge of RX as the wake source