void PWM_Out_Init(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f10x_xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f10x.c file
*/
/* System Clocks Configuration */
RCC_PWM_Configuration();
/* GPIO Configuration */
GPIOPWM_Configuration();
/* Compute the prescaler value */
TIM_DeInit(TIM1);//初始化TIM1寄存器
PrescalerValue = (uint16_t) (SystemCoreClock / 2000) - 1;
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 499;
TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;//PWM1為正常占空比模式，PWM2為反極性模式
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState=TIM_OutputNState_Enable;//互補輸出允許
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//High為占空比高極性
TIM_OCInitStructure.TIM_OCNPolarity=TIM_OCNPolarity_High;//互補輸出，與以上相反
TIM_OCInitStructure.TIM_OCIdleState=TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM1, ENABLE);
TIM_Cmd(TIM1, ENABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE);//使能TIM1的PWM輸出，TIM1與TIM8有效
}
/**
* @brief Configures the different system clocks.
* @param None
* @retval None
*/
void RCC_PWM_Configuration(void)
{
/* TIM3 clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
/* GPIOA and GPIOB clock enable */
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO, ENABLE);
}
/**
* @brief Configure the TIM3 Ouput Channels.
* @param None
* @retval None
*/
void GPIOPWM_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
//#ifdef STM32F10X_CL
/*GPIOB Configuration: TIM3 channel1, 2, 3 and 4 */
//GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
// GPIO_Init(GPIOC, &GPIO_InitStructure);
// GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE);
//#else
/* GPIOA Configuration:TIM3 Channel1, 2, 3 and 4 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOE, &GPIO_InitStructure);
GPIO_PinRemapConfig(GPIO_FullRemap_TIM1, ENABLE);
//#endif
}