ErrorStatus HSEStartUpStatus;
/* SYSCLK, HCLK, PCLK2 and PCLK1 configuration -----------------------------*/
/* RCC system reset(for debug purpose) */
RCC_DeInit();
/* Enable HSE */
RCC_HSEConfig( RCC_HSE_ON);
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if
(HSEStartUpStatus == SUCCESS)
{
/* HCLK = SYSCLK */
RCC_HCLKConfig( RCC_SYSCLK_Div1);
/* PCLK2 = HCLK */
RCC_PCLK2Config( RCC_HCLK_Div1);
/* PCLK1 = HCLK */
RCC_PCLK1Config(RCC_HCLK_Div1);
/* Select HSE as system clock source */
RCC_SYSCLKConfig( RCC_SYSCLKSource_HSE);
/* Wait till PLL is used as system clock source */
while
(RCC_GetSYSCLKSource() !=
0x04
)
{
}
}
else
{ /* If HSE fails
to start-up, the application will have wrong clock configuration.
User can add here some code to deal with this error */
/* Go to infinite loop */
while (
1
)
{
}
}
}
void TIM4_IRQHandler(
void
)
{
if
(TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)
{
// Обязательно сбрасываем флаг
TIM_ClearITPendingBit(TIM4, TIM_IT_Update);
GPIOC->ODR ^= GPIO_Pin_13;
}
}
int
main
(void)
{
SetSysClockToHSE();
/* Initialize LED which connected to PC13 */
GPIO_InitTypeDef GPIO_InitStructure;
// Enable
PORTC Clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
/* Configure the GPIO_LED pin */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_ResetBits(GPIOC, GPIO_Pin_13); // Set C13 to Low level ("0")
// TIMER4
TIM_TimeBaseInitTypeDef TIMER_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
TIM_TimeBaseStructInit(&TIMER_InitStructure);
TIMER_InitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIMER_InitStructure.TIM_Prescaler =
8000
;
TIMER_InitStructure.TIM_Period =
500
;
TIM_TimeBaseInit(TIM4, &TIMER_InitStructure);
TIM_ITConfig(TIM4, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM4, ENABLE);
/* NVIC Configuration */
/* Enable the TIM4_IRQn Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =
0
;
NVIC_InitStructure.NVIC_IRQChannelSubPriority =
0
;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
while(
1
)
{
// В главном цикле делаем что хотим
.
}
}
Теперь в главном цикле
можем делать что нам надо, а
светодиод будет
переключаться по таймеру.
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