topic S32K146 Uart send By eDMA failed in S32K

S32K146 Uart send By eDMA failed

mrsong — Wed, 27 Nov 2019 03:24:10 GMT

Hi .

i transfered data from memory to peripheral UART by eDMA failed and used uart interrupt successed ,here's what i tired and i want to know the reason why used DMA failed

step 1.successed (used uart interrupt sent）

config the transfer type interrupt

here's the test code

this function was succesed and serial port can print correct data :

step 2 . failed (used uart DMA sent）

config the transfer type DMA of UART

and DMA config :

here's the test code :

Type_uByte ubSrcData[100] = {0} ;
Type_uByte ubDesData[100] = {0} ;
void wvdTuner_Init(void)
{
      wvdDrv_UART_Init(UART_INSTANCE_1);//UART_INSTANCE_1 = 1

      EDMA_DRV_Init(&dmaController1_State, &dmaController1_InitConfig0, edmaChnStateArray, edmaChnConfigArray,       EDMA_CONFIGURED_CHANNELS_COUNT);
}
void wvdUartSendByDMA(void)
{
      wvdFW_SetMemory(ubSrcData,0xFE,sizeof(ubSrcData));

LPUART_DRV_SendData(UART_INSTANCE_1, ubSrcData,100);
}

this function was failes and serial port can not print data.

this is the SDK code:

best wishes .

Re: S32K146 Uart send By eDMA failed

linhnguyenhoang — Fri, 29 Nov 2019 10:08:52 GMT

Hello,

Did you use LPUART instance 1 ? If so you should set DMA request to LPUART1_RX/TX

Best regards,

Linh

Re: S32K146 Uart send By eDMA failed

wjandsq — Sun, 08 Dec 2019 12:51:58 GMT

EDMA_DRV_Init(&dmaController1_State, &dmaController1_InitConfig0, edmaChnStateArray, edmaChnConfigArray, EDMA_CONFIGURED_CHANNELS_COUNT);
EDMA_DRV_ChannelInit(&dmaController1Chn0_State, &dmaController1Chn0_Config); /* LPUART0 RX */
EDMA_DRV_ChannelInit(&dmaController1Chn1_State, &dmaController1Chn1_Config); /* LPUART0 TX */