STM32F405芯片USART 2M波特率下DMA收发丢数据

[loganm122]

我用板子A：STM32H743VIT6，HAL库开发，版本v1.9.0

HSE=20M，主频480M

串口1使能，DMA发送，IDLE+DMA接收数据。

发送使用1ms定时器进行DMA串口发送，发送间隔1ms，发送数据长度18字节。

板子B：STM32F405RGT6，HAL库开发，版本v1.27.0

HSE=8M，主频168M

串口2使能，DMA发送，IDLE+DMA接收数据。

数据发送使用1ms定时器，10ms间隔通过DMA发送数据，发送数据长度18字节。

连线

板子A的Tx-板子B的Rx。

板子A的Rx-板子B的Tx。

问题：

H7板子数据发送正常，统计1s内，理论应发1000*18=18000字节，实际收到18000字节。

但是F4板子数据收到不足18000字节，发送数据也丢字节。

IDLE中断没有耗时操作，只把收到数据长度进行累加，然后退出。

 

[loganm122]

使用UART，波特率2Mbps，1停止位，无校验，无流控

[mƎALLEm]

Hello,

In english please.

[loganm122]

STM32F405 chip USART 2M baud DMA received and sent data lost
I use board A: STM32H743VIT6, HAL library development, version v1.9.0 HSE = 20M, main frequency 480M serial port 1 enabled, DMA send, IDLE + DMA receive data. Send using 1ms timer for DMA serial send, send interval 1ms, send data length 18 bytes. Board B: STM32F405RGT6, HAL library development, version v1.27.0 HSE = 8M, main frequency 168M serial port 2 enabled, DMA send, IDLE + DMA receive data. Data send using 1ms timer, 10ms interval through DMA send data, send data length 18 bytes. Connect board A's Tx - board B's Rx. Board A's Rx - board B's Tx. Problem: H7 board data send normal, statistics within 1s, the theory should send 1000*18 = 18000 bytes, the actual received 18000 bytes. But F4 board data received less than 18000 bytes, send data also lost bytes. IDLE interrupt without time-consuming operation, only the length of the data received accumulated, and then exit. I use board A: STM32H743VIT6, HAL library development, version v1.9.0 HSE = 20M, main frequency 480M serial port 1 enabled, DMA send, IDLE + DMA receive data. Send using 1ms timer for DMA serial send, send interval 1ms, send data length 18 bytes. Board B: STM32F405RGT6, HAL library development, version v1.27.0 HSE = 8M, main frequency 168M serial port 2 enabled, DMA send, IDLE + DMA receive data. Data send using 1ms timer, 10ms interval through DMA send data, send data length 18 bytes. Connect board A's Tx - board B's Rx. Rx of board A - Tx of board B. Problem: H7 board data transmission is normal, statistics within 1s, the theory should send 1000*18=18000 bytes, the actual received 18000 bytes. But F4 board data received less than 18000 bytes, the transmitted data also lost bytes. IDLE interrupt has no time-consuming operation, only accumulates the length of the received data, and then exits.