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注册时间2015-3-12
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发表于 2015-3-12 22:11:33
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这是具体的程序:
#include "pwm_output.h"
static void TIM1_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9| GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // 复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
static void TIM1_Mode_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
u16 CCR1_Val = 50;
u16 CCR2_Val = 50;
u16 CCR3_Val = 50;
u16 CCR4_Val = 50;
TIM_TimeBaseStructure.TIM_Period = 999; //当定时器从0计数到999,即为1000次,为一个定时周期
TIM_TimeBaseStructure.TIM_Prescaler = 71;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ; //设置时钟分频系数:不分频
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //配置为PWM模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
//TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val; //设置跳变值,当计数器计数到这个值时,电平发生跳变
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //当定时器计数值小于CCR1_Val时为高电平
TIM_OC1Init(TIM1, &TIM_OCInitStructure); //使能通道1
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR2_Val; //设置通道2的电平跳变值,输出另外一个占空比的PWM
TIM_OC2Init(TIM1, &TIM_OCInitStructure); //使能通道2
TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR3_Val; //设置通道3的电平跳变值,输出另外一个占空比的PWM
TIM_OC3Init(TIM1, &TIM_OCInitStructure); //使能通道3
TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR4_Val; //设置通道4的电平跳变值,输出另外一个占空比的PWM
TIM_OC4Init(TIM1, &TIM_OCInitStructure); //使能通道4
TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM1, ENABLE); // 使能TIM1重载寄存器ARR
TIM_Cmd(TIM1, ENABLE); //使能定时器1
}
void TIM1_PWM_Init(void)
{
TIM1_GPIO_Config();
TIM1_Mode_Config();
}
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