Posted on December 14, 2013 at 09:32I wrote 1 sn delay code for stm32 and ı used 168 mhz system clock.My delay cycle ıs 16000 for each ms and ıt work led blınk 1 sn.It dıdn't work when ıt was 168000 shouldn't it have worked at 168000 cycle.my code ıs
**
** File : main.c
**
** Abstract : main function.
**
** Functions : main
**
** Environment : Atollic TrueSTUDIO(R)
** STMicroelectronics STM32F4xx Standard Peripherals Library
**
** Distribution: The file is distributed “as is,�? without any warranty
** of any kind.
**
** (c)Copyright Atollic AB.
** You may use this file as-is or modify it according to the needs of your
** project. This file may only be built (assembled or compiled and linked)
** using the Atollic TrueSTUDIO(R) product. The use of this file together
** with other tools than Atollic TrueSTUDIO(R) is not permitted.
**
*****************************************************************************
*/
/* Includes */
#include ''stm32f4xx.h''
/* Private macro */
/* Private variables */
/* Private function prototypes */
/* Private functions */
/**
**===========================================================================
**
** Abstract: main program
**
**===========================================================================
*/
void delay_ms(int delay1)
{
delay1 = delay1*16000;
while (--delay1)
{
}
}
int main(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_15 | GPIO_Pin_14 | GPIO_Pin_13 | GPIO_Pin_12; // we want to configure all LED GPIO pins
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT; // we want the pins to be an output
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz; // this sets the GPIO modules clock speed
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; // this sets the pin type to push / pull (as opposed to open drain)
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; // this sets the pullup / pulldown resistors to be inactive
GPIO_Init(GPIOD, &GPIO_InitStruct); // this passes the configuration to the Init function which takes care of the low level stuff
/* Infinite loop */
while (1)
{
// if(1 == GPIO_ReadInputDataBit( GPIOA,GPIO_Pin_0))
// {
// while(1 == GPIO_ReadInputDataBit( GPIOA,GPIO_Pin_0));
GPIO_SetBits ( GPIOD, GPIO_Pin_14) ;
delay_ms(1000);
GPIO_ResetBits (GPIOD, GPIO_Pin_14) ;
delay_ms(1000);
// }
}
}
/*
* Callback used by stm32f4_discovery_audio_codec.c.
* Refer to stm32f4_discovery_audio_codec.h for more info.
*/
void EVAL_AUDIO_TransferComplete_CallBack(uint32_t pBuffer, uint32_t Size){
/* TODO, implement your code here */
return;
}
/*
* Callback used by stm324xg_eval_audio_codec.c.
* Refer to stm324xg_eval_audio_codec.h for more info.
*/
uint16_t EVAL_AUDIO_GetSampleCallBack(void){
/* TODO, implement your code here */
return -1;
}
