M480BSP_FreeRTOS_Queue_UART_Rx

M480BSP_FreeRTOS_Queue_UART_Rx

update @ 2022/07/08

1. By using FreeRTOS with 3 task , and receive RX with PDMA function

   • vTask_check : to monitor Rx UART task

   • vTask_logger : regular logging task

   • vTask_uart : UART RX PDMA , chek define : ENABLE_PDMA_TIMEOUT , define :ENABLE_PDMA_SCATTER , for different UART RX PDMA behavior

   • PDMA Scatter-gather mode , refer from bleow link

http://forum.nuvoton.com/viewtopic.php?f=19&t=10909&sid=15c7298de4911fcd1bb8cac333723b71

2. vTask_uart scenario :

   • task initial

     • create Queue for notice, to monitor PDMA trigger

     • create StreamBuffer , to receive UART Rx data under PDMA IRQ

     • IMPORTANT : NVIC_SetPriority , priority must bigger than configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY

   • task loop

     • check Queue notice and prepare to get StreamBuffer data

     • also display PDMA received Rx data buffer , to compare between FreeRTOS StreamBuffer data

   • PDMA IRQ

     • insert Queue for notice , and copy PDMA received Rx data into StreamBuffer

3. below is log about ENABLE_PDMA_SCATTER

below is log about ENABLE_PDMA_TIMEOUT

below is teraterm setting , to transmit UART data