TMS320C6657: ti.sysbios.hal.Hwi: line 202: E_stackOverflow: ISR stack overflow error using UART

Heechang Nam

Part Number: TMS320C6657

Hello there,

I met Hwi stackOverflow in UART_read function. When I watch by ROV, stackpeak is under 1000 in program running but somtimes suddenly occur stackoverflow

Here attach .cfg file, and uart initialize code

I use TMS320C6657 board and PDK_c665x_2_0_16, bios_6_76_03_01

I've already try changing 'Hwi.checkStackFlag = false'
and also my setting of System (Hwi and Swi) stack size is 8192. I think it is enough size to deal with because received data size is 256 bytes.

Could you help me firgure out this problem?

Best regards,

Nam

Sadan.cfg

Fullscreen uart_initialize_code.txt Download

void UartTask::UART_Init()
{

    Board_initCfg boardCfg;
//    boardCfg = BOARD_INIT_PINMUX_CONFIG |
//               BOARD_INIT_MODULE_CLOCK  |
//               BOARD_INIT_UART_STDIO;
    boardCfg = BOARD_INIT_PINMUX_CONFIG |
    BOARD_INIT_MODULE_CLOCK;
    Board_init(boardCfg);
    UART_HwAttrs attr;
    UART_Params uparam = GetDefaultParams();
    UART_socGetInitCfg(0, &attr);
    UART_socSetInitCfg(0, &attr);
    UART_init();
    handle = UART_open(0, &uparam);
    if(handle != NULL)
    {
        printf("UART Open\n");
    }
}

UART_Params GetDefaultParams()
{
    UART_Params param;
    UART_Params_init(&param);
    param.baudRate = 115200;
    param.readDataMode = UART_DATA_BINARY;
    param.writeDataMode = UART_DATA_BINARY;
    param.parityType = UART_PAR_NONE;
    param.dataLength = UART_LEN_8;
    param.stopBits = UART_STOP_ONE;

    return param;
}

over 5 years ago

0 lding over 5 years ago

TI__Guru* 95265 points

Hi,

We have UART test examples inside PDK_c665x_2_0_16 and tested, we didn't see any problem. Have you verified that? What is the difference in your UART test vs TI provided test? You don't use DMA, correct? What if you make the stack even bigger?

Regards, Eric

0 Heechang Nam over 5 years ago in reply to lding

Prodigy 30 points

Hi Eric,

Thanks to reply.

I don't use DMA, correctly. And I made the stack size is 8,192 to 131,072 but in similar time, same problem occurs.

The difference in my UART test vs TI provided test is "ModuleTaskBase" class.

I attach ModuleTaskBase.hpp

Fullscreen ModuleTaskBase_hpp.txt Download

#ifndef MODULETASKBASE_HPP_
#define MODULETASKBASE_HPP_
#include <libcxx/map>
#include <libcxx/cstring>
#include <ti/sysbios/knl/Task.h>
#include <stdio.h>
template<class T>
class ModuleTaskBase
{
public:
    ModuleTaskBase() {};
    ~ModuleTaskBase() {};

    int Main(char* arg)
    {
        if(strcmp(arg, "start") == 0)
        {
            default_param;
            Task_Params_init(&default_param);
            default_param.arg0 = (xdc_UArg)this;
            Handle = Task_create(ModuleTaskBase::Task_Pointer, &default_param, NULL);
            if(Handle != NULL)
            {
                printf("Task Create...\n");
            }
        }
        else if(strcmp(arg, "stop") == 0)
        {
            OnStop();
            Task_delete(&Handle);
        }

        return 0;
    };

    static void Task_Pointer(UArg arg0, UArg arg1)
    {
        ModuleTaskBase<T>* module = (ModuleTaskBase<T>*)arg0;
        module->OnInit();
        module->OnStart();
    }

protected:
    virtual void OnInit(){};
    virtual void OnStart(){};
    virtual void OnStop(){};
    Task_Params Param;
    Task_Handle Handle;
private:
    Task_Params default_param;
};

#endif /* MODULETASKBASE_HPP_ */

There is UartTask class which is inherited ModuleTaskBase class.

In OnInit function which is UartTask's member function, config Board and open UART. And Onstart function have infinity loop and call UART_Read function in there.

main function is

{

UartTask ut;

ut.Main("start");

BIOS_start();

}

Maybe should I avoid using ModuleTaskBase?

Best Regards,

Nam

0 lding over 5 years ago in reply to Heechang Nam

TI__Guru* 95265 points

Hi,

Thanks for the info! The original code is written in C, you modified with C++ and create a ModuleTaskBase class. Do you see similar stack issues in other test applications? I would suggest to use the original C code. You can call C code from C++ with extern C.

Regards, Eric

0 Heechang Nam over 5 years ago in reply to lding

Prodigy 30 points

Hi,

I have done that use example C code provided by Ti as suggested, and no longer error.

Perhaps I need to fix the ModuleBaseTask code.

Thanks for advice!

Best Regards,

Nam

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TMS320C6657: ti.sysbios.hal.Hwi: line 202: E_stackOverflow: ISR stack overflow error using UART