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

Question asked by Richard Mensah on Jun 13, 2018
Latest reply on Aug 30, 2018 by Daniel Chen

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) {




    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,




    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));