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;
}
I debugged more during the issue
- LPUART DMA TX request bit is still set
- In DMA, DMA request signal bit is 0
