LPUART TX DMA issue S32K1xx

chandan_uv — Fri, 02 Aug 2024 11:57:22 GMT

I am using S32K146 and using UART TX and RX with DMA. Its working fine most of time but sometime unable to tx as lpuart0_state.isTxBusy doesn't reset to false. As this is rarely occurring, I am unable to reproduce it for debugging. Below are the configuration for UART. Please let me know how to debug it.

- lpuart0_state. transmitStatus is busy

- edma_chn_state_t.status is channel normal.

Below are the LPUART0 and DMA register data during the issue

void init_uart(void){ status_t ret = STATUS_SUCCESS; lpuart_user_config_t lpuart1_cfg; edma_init_iot_comm(); lpuart1_cfg.transferType = LPUART_USING_DMA; lpuart1_cfg.baudRate = 1000000; lpuart1_cfg.parityMode = LPUART_PARITY_DISABLED; lpuart1_cfg.stopBitCount = LPUART_ONE_STOP_BIT; lpuart1_cfg.bitCountPerChar = LPUART_8_BITS_PER_CHAR; lpuart1_cfg.rxDMAChannel = EDMA_CHN1_NUMBER; lpuart1_cfg.txDMAChannel = EDMA_CHN0_NUMBER; ret = LPUART_DRV_Init(UART_COM_4G, &lpuart0_state, &lpuart1_cfg); DEV_ASSERT(ret == STATUS_SUCCESS); // setLpuartHardFlowCtrl(); LPUART_DRV_InstallTxCallback(UART_COM_4G, lpuart_tx_callback_t, NULL); LPUART_DRV_InstallRxCallback(UART_COM_4G, lpuart_rx_callback_t, NULL); LPUART_DRV_ReceiveData(UART_COM_4G, iot_rx_struct.data, MAX_RX_IOT_COMM_BUFFER); IOT_COMM_UART_FLOW_START_RX; }

static status_t edma_init_iot_comm(void){ status_t ret = STATUS_SUCCESS; edma_chn_state_t *const edma_channel_states[] = { &dma_ctrl_chn0_state, &dma_ctrl_chn1_state }; edma_channel_config_t dm_chn0_cfg = { .channelPriority = EDMA_CHN_PRIORITY_1, .virtChnConfig = EDMA_CHN0_NUMBER, .source = EDMA_REQ_LPUART0_TX, .callback = NULL, .callbackParam = NULL, .enableTrigger = false }; edma_channel_config_t dm_chn1_cfg = { .channelPriority = EDMA_CHN_PRIORITY_0, .virtChnConfig = EDMA_CHN1_NUMBER, .source = EDMA_REQ_LPUART0_RX, .callback = edma_RX_callback, //NULL, .callbackParam = NULL, .enableTrigger = false }; const edma_channel_config_t *const edma_chn_cfg_arr[] = { &dm_chn0_cfg, &dm_chn1_cfg }; edma_user_config_t dma_ctrl_init_cfg = { .chnArbitration = EDMA_ARBITRATION_FIXED_PRIORITY, .haltOnError = false }; ret = EDMA_DRV_Init(&dma_ctrl_state, &dma_ctrl_init_cfg, edma_channel_states, edma_chn_cfg_arr, EDMA_CONFIGURED_CHANNELS_COUNT); DEV_ASSERT(ret == STATUS_SUCCESS); return ret; }

Re: LPUART TX DMA issue S32K1xx

chandan_uv — Mon, 05 Aug 2024 12:06:34 GMT

I debugged more during the issue

- LPUART DMA TX request bit is still set

- In DMA, DMA request signal bit is 0

Re: LPUART TX DMA issue S32K1xx

Senlent — Mon, 19 Aug 2024 01:58:52 GMT

Hi@chandan_uv

We are currently overloaded and response times are slow, thank you for your understanding.

Can you provide a demo so we can reproduce your issue?

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