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Turn On a LED on STM32F4-discovery

Flavien CASSAGNE

Hi everyone,

I want to turn on a LED on my STM32F4-discovery board

Here is the code :

int main()
{

// Enable the GPIO Clock

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);

// GPIO Configuration

GPIO_InitTypeDef GPIO_InitStruct;

GPIO_InitStruct.GPIO_Pin = GPIO_Pin_14; // Led 6 Blue selected

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT; // Mod out !

GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; // 50 MHZ clock frequency

GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; // Push pull mod

GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP; // Pull up

GPIO_Init(GPIOD, &GPIO_InitStruct);

// Turn on the LED

GPIO_SetBits(GPIOD, GPIO_Pin_14);

return 0;
}

I'm using uvision 5.13.0.0

It compiles and flash succesfully but nothing happen after. I don't know what is wrong with this. I also tried with this :

STM_EVAL_LEDInit(LED6);
STM_EVAL_LEDOn(LED6);

but there is no worked.

Can you help me ?
Many thanks :)

Parents
  • 0 in reply to Westonsupermare Pier

    Hi,

    Fisrt i appologize, I'm a newbie and this is the fisrt time I use Keil and STM32.
    I checked with all your instructions and when i check "Run to main" option it crashes and i'm on this loop :

    void HardFault_Handler(void)
{
  /* Go to infinite loop when Hard Fault exception occurs */
  while (1)
  {
  }
}

    So i can't go in main.
    Then I unchecked "Run to main" option. SystemInit is ok and doesn't crash.
    In my project i have these options in preprocessor symbols definition:

     USE_STDPERIPH_DRIVER,STM32F4XX,KEIL_IDE,PLL_M=8,PLL_N=336,PLL_P=2,PLL_Q=7,HSE_VALUE=8000000

    Then it starts __main instruction and it seems to crash here. What can i do after that to check the error ?

    Many thanks,

Reply
  • 0 in reply to Westonsupermare Pier

    Hi,

    Fisrt i appologize, I'm a newbie and this is the fisrt time I use Keil and STM32.
    I checked with all your instructions and when i check "Run to main" option it crashes and i'm on this loop :

    void HardFault_Handler(void)
{
  /* Go to infinite loop when Hard Fault exception occurs */
  while (1)
  {
  }
}

    So i can't go in main.
    Then I unchecked "Run to main" option. SystemInit is ok and doesn't crash.
    In my project i have these options in preprocessor symbols definition:

     USE_STDPERIPH_DRIVER,STM32F4XX,KEIL_IDE,PLL_M=8,PLL_N=336,PLL_P=2,PLL_Q=7,HSE_VALUE=8000000

    Then it starts __main instruction and it seems to crash here. What can i do after that to check the error ?

    Many thanks,

Children
  • 0 in reply to Flavien CASSAGNE

    When you call __main, lots of things will happen before you reach your normal main() function.

    You might get a stack overflow.

    Or maybe your memory layout doesn't match your chip, so the startup code tries to initialize non-existing memory.

    Maybe your project specifies external memory, and you haven't initialized the memory controller that interfaces with the external memory.

  • 0 in reply to edPer Westermark

    You might get a stack overflow.

    Or it could be that the stack pointer is initialized assuming that the stack resides in memory that is only available once __main is executed. With the execution of __main being a call, that execution occurs, only to fail when it attempts to return to the caller.