making a cast from void pointer to pointer to struct results in hardware fault

richardmensah — Wed, 13 Jun 2018 20:15:25 GMT

I am writing a simple blinking LED program in MCUXpresso with ksdk 2.4 and Amazon Freertos. I intended to create two instances of the same thread definition by passing a void pointer to my structure which contains the GPIO type and pin number to the thread and later typecast the void pointer to pointer to my structure. however, during debugging, i realised that the new pointer points to a completely different address from my struct data and it always causes a hardware fault. This is however a code which works very well in Kinetis Design studio. I will appreciate help in understanind this problem.

#include <stdio.h>
#include "board.h"
#include "peripherals.h"
#include "pin_mux.h"
#include "clock_config.h"
#include "MK22F51212.h"
#include "fsl_debug_console.h"

typedef struct BLINKY_param {
GPIO_Type* GPIO;
uint8_t Pin_name;
} BLINKY_param_t;

enum PINS {
PTD2 = 2, // LED_A
};

#include "FreeRTOS.h"
#include "task.h"
#include "semphr.h"
#include "timers.h"
#include "queue.h"

void air_blinky(void* blinky_parameters) ;
#define mask(x) ( uint32_t )( 1U << (x) )

int main(void) {

CLOCK_EnableClock(kCLOCK_PortD);
PORT_SetPinMux(PORTD,PTD2,kPORT_MuxAsGpio);

gpio_pin_config_t config = { kGPIO_DigitalOutput, 0 };
GPIO_PinInit(GPIOD, PTD2, &config);

BLINKY_param_t Board_A_blinky = {GPIOD,PTD2};

   if (xTaskCreate(air_blinky, "air_blinky_A", 50, &Board_A_blinky, 2,
   NULL) == errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY)
       exit(-1);

vTaskStartScheduler();

   while (1) {
   }
   return 0;
}

void air_blinky(void* blinky_parameters) {

const BLINKY_param_t* LED = (BLINKY_param_t*) blinky_parameters;

TickType_t Lastwakeuptime = xTaskGetTickCount();
uint8_t Flash_Time = 100;

   for (;;)
   {
       GPIO_PortToggle(LED->GPIO, mask(LED->Pin_name));             // on
       vTaskDelayUntil(&Lastwakeuptime,((Flash_Time * configTICK_RATE_HZ) / (float) 1000));
       GPIO_PortToggle(GPIOD, mask(PTD2));            // off
       vTaskDelayUntil(&Lastwakeuptime,((Flash_Time * configTICK_RATE_HZ) / (float) 1000));
       GPIO_PortToggle(GPIOD, mask(PTD2));             // on
       vTaskDelayUntil(&Lastwakeuptime,((Flash_Time * configTICK_RATE_HZ) / (float) 1000));
       GPIO_PortToggle(GPIOD, mask(PTD2));            // off

vTaskDelayUntil(&Lastwakeuptime,((2000 * configTICK_RATE_HZ) / (float) 1000));
}

}

Re: making a cast from void pointer to pointer to struct results in hardware fault

danielchen — Wed, 04 Jul 2018 00:52:28 GMT

Hi Richard:

Could you please attach your project so I can reproduce your issue on my side?

Regards

Daniel

Re: making a cast from void pointer to pointer to struct results in hardware fault

richardmensah — Wed, 04 Jul 2018 20:34:00 GMT

Hi, Thanks for responding, Please find attached my project

Re: making a cast from void pointer to pointer to struct results in hardware fault

danielchen — Fri, 31 Aug 2018 06:45:54 GMT

Hi Richard:

Sorry for lost tracking this thread.

It seems your issue resulted from the second parameter of vTaskDelayUntil, it is a const TickType_t.

vTaskDelayUntil(&Lastwakeuptime,((Flash_Time * configTICK_RATE_HZ) / (float) 1000));

I suggest you use macro pdMS_TO_TICKS .

Regards

Daniel

MCUXpresso Generalのトピックmaking a cast from void pointer to pointer to struct results in hardware fault

making a cast from void pointer to pointer to struct results in hardware fault

Re: making a cast from void pointer to pointer to struct results in hardware fault

Re: making a cast from void pointer to pointer to struct results in hardware fault

Re: making a cast from void pointer to pointer to struct results in hardware fault