How to transmit USART data by DMA with STM32MP1xx HAL Driver (HAL_USART_Transmit_DMA)?

HMasu.1 · ‎2020-07-13

Hi, all.

I use STM32MP151CAA3.

I want to transmit USART data by DMA with HAL Driver.

I’m trying to use HAL_USART_Transmit_DMA () function to transmit data.

In the case of STM32F437ZI(using STM32F4xx HAL Driver), when calling HAL_USART_Transmit_DMA(), USART_DMATransmitCplt() were called after USART transmission completed, and husart->State changed to HAL_USART_STATE_READY (stm32f4xx_hal_usart.c Line 1331).

However, in the case of STM32MP151(using STM32mp1xx HAL Driver), when to called HAL_USART_Transmit_DMA(), USART_DMATransmitCplt() were also called after transmission completed, but husart->State doesn't changed to HAL_USART_STATE_READY.

So, next time I try to call HAL_USART_Transmit_DMA(), I cannot transmit data because if statement (if (husart->State == HAL_USART_STATE_READY)) excludes to transmit USART data. (stm32mp1xx_hal_usart.c Line 1375).

Has the usage of the USART HAL driver changed compared to STM32F4xx HAL Driver?

Do I need to change the variable husart->State myself anywhere?

Best regards.

H. Masuda

HMasu.1 · ‎2020-07-15

Would you please give me some information on the above HAL driver questions?

Please let me know if you seem to lack information about above question.

Best Regards.

H. Masuda