Hello,
I am using a custom board based off the MIMXRT1050-EVK demo board. I am currently trying to communicate with an external RFID board through port LPUART4. When I send a command through the RFID <BA 02 F0 48> I should receive back <BA 02 F0 48 BD 1A F0 00 53 4C 30 33 32 2D 32 2E 37 20 56 33 2E 31 2D 32 30 31 39 30 31 30 32 01>.
For some reason, I am getting all the data back besides the last byte "01". The 01 is not triggering the LPUART4 interrupt. I can manually read the LPUART4 data register after waiting at least 3 milliseconds and see the 01 but it never triggers the UART interrupt.
Any ideas on what may be happening?
//Initialize uart, set fifo levels, clear registers and interrupts.
void InitUart(volatile LPUART_Type *pUart)
{
LPUART_SoftwareReset(pUart); // cpu port
lpuart_config_t lpuartConfig;
lpuartConfig.baudRate_Bps = 115200U;
lpuartConfig.parityMode = kLPUART_ParityDisabled;
lpuartConfig.dataBitsCount = kLPUART_EightDataBits;
lpuartConfig.isMsb = false;
lpuartConfig.stopBitCount = kLPUART_OneStopBit;
lpuartConfig.txFifoWatermark = 0;
lpuartConfig.rxFifoWatermark = 1;
lpuartConfig.enableRxRTS = FALSE;
lpuartConfig.enableTxCTS = FALSE;
lpuartConfig.enableTx = true;
lpuartConfig.enableRx = true;
LPUART_Init(pUart, &lpuartConfig, 80000000U);
}
void test(void)
{
LPUART_EnableInterrupts(LPUART4, kLPUART_TxDataRegEmptyInterruptEnable | kLPUART_RxDataRegFullInterruptEnable);
EnableIRQ(LPUART4_IRQn); //@knxnew xint2
XmitCrt((uint8_t)0xBA);
XmitCrt((uint8_t)0x02);
XmitCrt((uint8_t)0xF0);
XmitCrt((uint8_t)0x48);
milisec(3); //if i dont wait at least 3miliseconds I wont see the 01
unsigned char data = LPUART_ReadByte(LPUART4); //read character and store in data
}
