RTOS/TMDSEVM572X: System hangs on UART read

Anjana Pathak0

Expert 2205 points

Part Number: TMDSEVM572X

Tool/software: TI-RTOS

Hi,

I am working with GP EVMAM572x

PDK: pdk_am57xx_1_0_5

RTOS: processor_sdk_rtos_am57xx_3_02_00_05

I configure UART3 to read data in callback mode or interrupt mode, for this i did following modification in NIMU basic example project.

1. initialise UARTa as follows

void InitialiseUART_3()
{
int32_t addrScanPrompt;//,byterd;
//char HeadingMark_1, prv_HeadingMark_1;
//UART_Handle uart = NULL;
UART_Params uartParams;
/* UART SoC init configuration */
UART_HwAttrs uart_cfg;
//SemaphoreP_Params semParams;
UART_init();
/***************************************UART_In_Callback();***************/
/* Create call back semaphore */
/*UART_osalSemParamsInit(&semParams);
semParams.mode = SemaphoreP_Mode_BINARY;
callbackSem = UART_osalCreateBlockingLock(0, &semParams);*/
/* Get the default UART init configurations */
UART_socGetInitCfg(UART_INSTANCE, &uart_cfg);
uart_cfg.edmaHandle = NULL;
uart_cfg.dmaMode = FALSE;
uart_cfg.loopback = FALSE;

UART_socSetInitCfg(UART_INSTANCE, &uart_cfg);

/* Set callback mode for read */
UART_Params_init(&uartParams);
uartParams.baudRate = 76800;
uartParams.parityType= UART_PAR_EVEN;
uartParams.readCallback = UART_callback;
uartParams.readMode = UART_MODE_CALLBACK;
uartParams.readDataMode = UART_DATA_BINARY;
uartParams.readReturnMode = UART_RETURN_FULL;
/*uartParams.writeCallback = NULL;
uartParams.writeMode = UART_MODE_CALLBACK;*/

uart = UART_open(UART_INSTANCE, &uartParams);
if (uart == NULL)
{
// goto Err;
}
/*************************************************************************/
Task_sleep(100);
addrScanPrompt= (int32_t)scanPrompt;
if(UART_read(uart, (void *)addrScanPrompt,INPUT_LENGTH)==UART_ERROR)
{
//goto Err;
}

Task_sleep(100);
}

2. written a callbackfunction

void UART_callback(UART_Handle handle, void *buf, size_t count)
{
A_Cnt=A_Cnt+count;
NextSerialData=1;

}

3. Call a read function in task while loop

void Read_A_Cnt()
{

if(NextSerialData)

{
NextSerialData=0;

/*UART_putNum_Anjana(A_Cnt);
UART_write(uart, &scanPrompt,5); //Task_sleep(100);*/
//Semaphore_pend( callbackSem, BIOS_WAIT_FOREVER );

//memset(scanPrompt, 0, sizeof(scanPrompt));
addrScanPrompt_1= (int32_t)scanPrompt;
UART_read(uart, (void *)addrScanPrompt_1,INPUT_LENGTH);
//UART_osalPendLock(callbackSem, SemaphoreP_WAIT_FOREVER);

if(A_Cnt <=500)

{A_Cnt =0;}

}

}

But after some time the execution hangs. i am Not able to identify the issue. Please help me to identify. Is it the issue with UART3 as it has been used as debug port by default?

Thanks,

Anjana Pathak

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

The RTOS team have been notified. They will respond here.

0 Sahin Okur over 8 years ago

TI__Mastermind 27355 points

Hi Anjana,

Can you please describe where the execution hangs?

Have you tried running the modified UART example independently of NIMU example to see if the execution still hangs? It could be an issue with the ISRs conflicting.

Regards,
Sahin

0 Anjana Pathak0 over 8 years ago in reply to Sahin Okur

Expert 2205 points

How can i disable debug massages from NIMU example on UART3?

0 Sahin Okur over 8 years ago in reply to Anjana Pathak0

TI__Mastermind 27355 points

Anjana,

To disable the debug messages, comment out the following lines:

#ifndef IO_CONSOLE
#define NIMU_log UART_printf
#else
#define NIMU_log printf
#endif

Best,
Sahin

0 Anjana Pathak0 over 8 years ago in reply to Sahin Okur

Expert 2205 points

Hi Sachin,

This will only disable the debug massages from the main file. but what about the include files debug msg.

How will i disable uart3 debug messages from whole project?

Currently i am using NIMU_BasicExample_evmAM572x.

Anjana Pathak

0 Sahin Okur over 8 years ago in reply to Anjana Pathak0

TI__Mastermind 27355 points

Hi Anjana,

To remove those NIMU messages, you need to remove the ENET_PHY_LOG function calls in enet_phy.c found in the directory

PDK\packages\ti\board\src\evmAM572x\device

then rebuild the board library by running

gmake board_lib LIMIT_SOCS="AM572x" LIMIT_BOARDS="evmAM572x" LIMIT_CORES="a15_0"

Note, normally you could define IO_CONSOLE in enet_phy.c to switch to console messages but due to a current bug that is not possible.

Let me know if you run into any issues.

Best,
Sahin

0 Anjana Pathak0 over 8 years ago in reply to Sahin Okur

Expert 2205 points

Thanks a lot...

0 Anjana Pathak0 over 8 years ago in reply to Sahin Okur

Expert 2205 points

Hi,

Uart_read() function returns UART_ERROR after some time for example it reads the byte for 10 seconds and after that starts returning ERROR. so stops to execute ISR in callback mode.

why this UART_read function is returning UART_ERROR(-1)?

Thanks,

Anjana Pathak

0 Sahin Okur over 8 years ago in reply to Anjana Pathak0

TI__Mastermind 27355 points

Hi Anjana,

There are many reasons why the UART_read function could be returning an error. To help narrow it down, please try setting your baud rate to a standard value like 115200 and your parity to none or odd and see if it still returns an error after 10 seconds.
In the meantime, I will continue to look into this further.

Best,
Sahin

0 Anjana Pathak0 over 8 years ago in reply to Sahin Okur

Expert 2205 points

But my requirement is to read data at baud rate 76800 and parity even. So I want to achieve it.

0 Anjana Pathak0 over 8 years ago in reply to Sahin Okur

Expert 2205 points

I replace UART_Read by UART_readPolling function and used it in Blocking mode with 76800 baud rate and even parity. It is working fine.

0 Anjana Pathak0 over 8 years ago in reply to Anjana Pathak0

Expert 2205 points

I want to use UART3 for writing debug msgs and UART1 for reading data. How it is possible to use these port in same application?

0 Sahin Okur over 8 years ago in reply to Anjana Pathak0

TI__Mastermind 27355 points

Hi Anjana,

Your code working in polling mode indicates it's most likely an interrupt issue. You can definitely use UART3 for debug and UART1 for your application following the steps outlined in this post e2e.ti.com/.../2199150

If you run into any specific issues please let us know.

Best,
Sahin

0 Anjana Pathak0 over 8 years ago in reply to Sahin Okur

Expert 2205 points

Hi Sahin,
I did all the changes and tried as mention in the post you attached. still i am not able to open two port UART3 and UART1. Individually both are working. But when i try to open both the port it is giving run time error ( Unhandled ADP_Stopped exception 0x20023).

Anjana Pathak

0 Sahin Okur over 8 years ago in reply to Anjana Pathak0

TI__Mastermind 27355 points

Hi Anjana,

Unhandled ADP_Stopped exception 0x20023 indicates an unknown run-time error that is not supported by the ARM debugger. Can you determine where in the code it occurs? Also, ensure that you are using different handles when opening the UART instances.

Best,
Sahin

0 Anjana Pathak0 over 8 years ago in reply to Sahin Okur

Expert 2205 points

Hi,
Now both the UARTS are working fine......
one with the customized baud rate and other with the default baud rate.
The issue was with initialization steps and uart param and config pointer.
Also the hardware pin of P18 described in general purpose EVM user guide is not correct for UART1 tx and Rx UART1_Rxd is at pin 30 and UART1_Txd is at pin 60.

Thanks a lot for support..
Anjana Pathak

0 Sahin Okur over 8 years ago in reply to Anjana Pathak0

TI__Mastermind 27355 points

Hi Anjana,

I'm glad to hear your issue is resolved! I'll forward your feedback to the team.

Best,
Sahin

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RTOS/TMDSEVM572X: System hangs on UART read