topic Re: LPUART_RTOS_Receive Error Question in i.MX RT Crossover MCUs

LPUART_RTOS_Receive Error Question

Seongyon_Jeong — Wed, 25 Oct 2023 04:47:36 GMT

Hi.

While I am using LPUART_RTOS_Receive, I`ve got Error code 1309 (kStatus_LPUART_RxHardwareOverrun), It means that ev value from xEventGroupWaitBits is RTOS_LPUART_HARDWARE_BUFFER_OVERRUN

Of cource, It is very rare case, 4~6 times in 12hours test

Saying the circumstance,

I.MX RT 1020 EVK board

1. Baudrate, 19200 bps

lpuart_rtos_config_t lp2_rt_config = {

.base = LPUART2,

.srcclk = 80000000UL,

.baudrate = 19200,

.parity = kLPUART_ParityDisabled,

.stopbits = kLPUART_OneStopBit,

.buffer = g_UART2rxRingBuffer, // RingBuffer size 512.

.buffer_size = sizeof(g_UART2rxRingBuffer),

.rx_timeout_constant_ms = 1,

.rx_timeout_multiplier_ms = 1,

.tx_timeout_constant_ms = 20,

.tx_timeout_multiplier_ms = 1,

};

2. FreeRTOSConfig.h

#define configUSE_PREEMPTION 1

#define configCPU_CLOCK_HZ (SystemCoreClock) // maybe 500Mhz ??

#define configTICK_RATE_HZ ((TickType_t)1000) // 1 tick, 1ms

#define configUSE_TIME_SLICING 1 // Around 10 tasks having same priority, exist.

3. When I call this function,

// timeout value first byte100ms, next byte 3ms

LPUART_RTOS_SetRxTimeout(m_hSerial, timeout, 1);

// I receive data by one Byte , Byte by Byte, using while (~~), about 30~ 40byte variant Length.
int lpuart_result = LPUART_RTOS_Receive(m_hSerial, (unsigned char*)buffer, 1, &n);

For solving this overrun Error, What am I supposed to do ?

As I think, Is this problem from the Speed of moving data from UART buffer to Ring buffer ?

So.

1. Do I need to change configTICK_RATE_HZ value ??

2. Before calling LPUART_RTOS_Receive, Do I have to set priority of This Task, Higher ?

OfCourse, when Exit LPUART_RTOS_Receive, restore priority value of that task.

3. or... change something arguement from FreeRTOS ??

4. change code?? RX interrupt handler code ? LPUART interrupt priority ?(using NVIC set priority)

Please advice to me

Re: LPUART_RTOS_Receive Error Question

nxf77486 — Fri, 27 Oct 2023 23:16:59 GMT

Hello,

Thank you in advance for contacting NXP support.

In this case can you please help me with some extra details.

Q1: In the meantime is not necessary to modify the configTICK_RATE_HZ.
Q2: For this it would be really helpful if you can send me the task creation for the LPUART_RTOS_Receive task. This in order to understand how is this been configured and the current priority.
Q3: For this first approach it is not necessary to implement a change on the FreeRTOS.
Q4: Its is important to have an interrupt handler to manage and clean the reception flags. Also I will appreciate if you can send me the configuration of this interruption.

Also I will recommend for this case to give a look into our RT1020 SDK examples we have an LPUART_freeRTOS included that can be useful as a reference.

Please let me know this information.

Re: LPUART_RTOS_Receive Error Question

Seongyon_Jeong — Wed, 01 Nov 2023 07:29:57 GMT

I am sorry , I can not send the code. right now. I don`t have authority,

From, answer of Q2, I found improvement point, so I am doing this job , test.

thank you for the answer, If I need more help, I will upload question more detaily , as new topic