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SysTick - STM32F429ZI

Question asked by valencia.juan on Jun 8, 2014
Latest reply on Jun 8, 2014 by valencia.juan
Hi, i'm trying to make a led toggle every second with SysTick but it's not working. The toggle occurs every 3 secs more or less. I also tried to do it with timers but i can't get the frequency right. However in the SysTick example provided  in "STM32Cube_FW_F4_V1.1.0" the Led's toggle when they have to. I'm clearly having problems when i tried to develope all the code by myself but i can't see the source of error. I think the problem is the clock source configuration but all seem fine to me. I hope someone can help me.

Heres the code:

#include "stm32f4xx.h"
#include "stm32f4xx_conf.h"
RCC_ClocksTypeDef RCC_ClockFreq;
static void LED(void);
static void Delay(uint16_t);
uint16_t delay=0;
uint16_t count=0;
uint8_t source=0;
void SysTick_Handler(void)
int main(void){
     source=RCC_GetSYSCLKSource ();
    SysTick_CLKSourceConfig (SysTick_CLKSource_HCLK);
void LED(void){
 GPIO_InitTypeDef GPIO_InitStructure; // LED Port Info
 // Enable the port clock
 RCC_AHB1PeriphClockCmd (RCC_AHB1Periph_GPIOG, ENABLE);
 // Prepare the port info
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14; // Line 12
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; // As Output
 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // Push-pull
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; // At 100MHz
 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; // Without pull-up-down
    // Initialize the port
 GPIO_Init (GPIOG, &GPIO_InitStructure);   
void Delay(uint16_t delay){


I'm using Keil uVision 5.