Posted on May 17, 2011 at 14:27Guessing is good, code might be better...
void RCC_Configuration(void) {
RCC_DeInit();
RCC_HSEConfig(RCC_HSE_ON);
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if (HSEStartUpStatus == SUCCESS)
{
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
FLASH_SetLatency(FLASH_Latency_2);
RCC_HCLKConfig(RCC_SYSCLK_Div1);
RCC_PCLK2Config(RCC_HCLK_Div1);
RCC_PCLK1Config(RCC_HCLK_Div2);
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
RCC_PLLCmd(ENABLE);
while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
while(RCC_GetSYSCLKSource() != 0x08)
{
}
}
else
{
while (1)
{
}
}
/* Enable USART1, GPIOA, GPIOB, GPIOC and AFIO clocks */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |
RCC_APB2Periph_GPIOB |
RCC_APB2Periph_GPIOC |
RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOA |
RCC_APB2Periph_GPIOB |
RCC_APB2Periph_GPIOC,
DISABLE);
}
void initTimer(void)
{
TIM_TimeBaseInitTypeDef TimeBaseInit;
TIM_OCInitTypeDef TIM_OCInitStructure;
TimeBaseInit.TIM_Period = 35999;
TimeBaseInit.TIM_Prescaler = 999;
TimeBaseInit.TIM_ClockDivision = TIM_CKD_DIV1;
TimeBaseInit.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TimeBaseInit);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 6000;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM2, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Disable);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_ClearFlag(TIM2, TIM_IT_CC1);
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);
TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE);
TIM_Cmd(TIM2, ENABLE);
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);
}
void TIM2_IRQHandler()
{
if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET) {
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);
GPIO_WriteBit(GPIOC, GPIO_Pin_12, (BitAction) 1 - GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_12));
}
}
