《STM32高级定时器-PWM简单学习案例.doc》由会员分享,可在线阅读,更多相关《STM32高级定时器-PWM简单学习案例.doc(4页珍藏版)》请在三一文库上搜索。
1、STM32高级定时器-PWM简单学习案例高级定时器与通用定时器比较类似,下面是一个TIM1 的PWM 程序,TIM1是STM32唯一的高级定时器。共有4个通道有死区有互补。先是配置IO脚:GPIO_InitTypeDef GPIO_InitStructure;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, GPIO_InitStructu
2、re);GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOB, GPIO_InitStructure);RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);RCC_APB2PeriphClo
3、ckCmd(RCC_APB2Periph_GPIOB, ENABLE);TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;TIM_OCInitTypeDef TIM_OCInitStructure;void Tim1_Configuration(void)TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;TIM_OCInitTypeDef TIM_OCInitStructure;TIM_DeInit(TIM1); /重设为缺省值TIM_TimeBaseStructure.TIM_Prescaler = 4000
4、; /预分频(时钟分频)72M/4000=18KTIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; /向上计数TIM_TimeBaseStructure.TIM_Period = 144; /装载值 18k/144=125hz 就是说向上加的144便满了TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; /设置了时钟分割 不懂得不管TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0; /周期计数器值 不懂得不管TIM_T
5、imeBaseInit(TIM1,TIM_TimeBaseStructure); /初始化TIMx的时间基数单位TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; /PWM模式2TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; /正向通道有效 PA8TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; /反向通道也有效 PB13TIM_OCInitStructure.TIM_Pulse = 40; /
6、占空时间 144 中有40的时间为高,互补的输出正好相反TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; /输出极性TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; /互补端的极性TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; /空闲状态下的非工作状态不管TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; /先不管TIM
7、_OC1Init(TIM1,TIM_OCInitStructure); /数初始化外设TIMx通道1这里2.0库为TIM_OCInitTIM_Cmd(TIM1,ENABLE);TIM_CtrlPWMOutputs(TIM1,ENABLE);/设置捕获寄存器1void SetT1Pwm1(u16 pulse)TIM1-CCR1=pulse;/在MAIN 中加点键盘扫描啥的用来改变占空比#include STM32Libstm32f10x.h#include hal.hextern void SetT1Pwm1(u16 pulse);int main(void)u16 pulse=40;ChipHalInit(); /片内硬件初始化ChipOutHalInit(); /片外硬件初始化for(;)if(GET_UP()while(GET_UP();if(pulse=144)pulse+=5;SetT1Pwm1(pulse);if(GET_DOWN()while(GET_DOWN();if(pulse30)pulse-=5;SetT1Pwm1(pulse);