没有PWM波形产生，程序如下！求助大神！

Smile_cf · 发表于 2014-8-23 16:45:39

[mw_shl_code=c,true]#include "stm32f10x.h" uint16_t PrescalerValue =0; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; void RCC_Configuration(void); void GPIO_Configuration(void); void Delay(__IO uint32_t nCount); int main(void) { RCC_Configuration(); GPIO_Configuration(); PrescalerValue = (uint16_t) (SystemCoreClock /24000000) - 1; TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); TIM_TimeBaseStructure.TIM_Period = 1000; TIM_TimeBaseStructure.TIM_Prescaler =PrescalerValue; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle; //选择输出比较触发模式 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出比较极性低 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //选择输出比较状态 TIM_OCInitStructure.TIM_Pulse = 600; TIM_OC1Init(TIM3, &TIM_OCInitStructure); TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Disable); TIM_Cmd(TIM2, ENABLE); } void RCC_Configuration(void) { RCC_PCLK1Config(RCC_HCLK_Div4); //AHB时钟==设置系统时钟/4 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO,ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); } void GPIO_Configuration(void) { GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_Init(GPIOA, &GPIO_InitStructure); } void Delay(__IO uint32_t nCount) { for(; nCount != 0; nCount--); } #ifdef USE_FULL_ASSERT void assert_failed(uint8_t* file, uint32_t line) { while (1) { } } #endif [/mw_shl_code]