systick always 3 times what it should be

[michaelmccartyeng]

Posted on June 18, 2013 at 05:03

I've tested the example systick app and it worked, but my (keil) app will not work. I'm just trying to blink a light on a 2 sec interval, super frustrating.

the project settings have the system clock at 25mhz. I'm using stm32f4 eval board.// in that system.c file#if !defined  (HSE_VALUE)   #define HSE_VALUE    ((uint32_t)25000000) /*!< Value of the External oscillator in Hz */#endif /* HSE_VALUE *//** * @brief In the following line adjust the External High Speed oscillator (HSE) Startup    Timeout value    */#if !defined  (HSE_STARTUP_TIMEOUT)   #define HSE_STARTUP_TIMEOUT    ((uint16_t)0x0500)   /*!< Time out for HSE start up */#endif /* HSE_STARTUP_TIMEOUT */   #if !defined  (HSI_VALUE)     #define HSI_VALUE    ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/#endif /* HSI_VALUE */  // in startup case 0x01: if (SysTick_Config(SystemCoreClock / 1000)) {  /* Capture error */  while (1); } nodeTimeID = data[j++]; break;// elsewhere  while(1) {     GPIOD->BSRRL = GPIO_Pin_14; // hi  Delay(2000); GPIOD->BSRRH = GPIO_Pin_14; // lo Delay(2000); }

[Tesla DeLorean]

Posted on June 18, 2013 at 05:21

Check if you have HSE_VALUE defined as part of the project meta-data.

Make sure the settings for HSE_VALUE are coherent with the board, and the the PLL settings in the system_stm32f4xx.c are too. The STM32F4-Discovery has an 8 MHz crystal. Confirm clocks via MCOx pins. Try configuring with HSI