用keil 开发的可输出8路PWM STM32单片机程序, 利用定时器TIM1和TIM2进行控制输出.
这里是用STM32产生8路的pwm,方便实现4个电机的差速控制。
下载:
STM32-8PWM.rar
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单片机源程序如下:
- #include "stm32f10x.h"
- //#include "systick.h" //SysTick定时器被捆绑在NVIC中 系统函数
- //#include "hardware_conf.h"//所用开发板中硬件外设 系统函数
- void GPIO_Configuration(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- //启动GPIO
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);
- //启动AFIO
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
- //启动TIM1,功能复用IO时钟
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);//使能或者失能APB1外设时钟,RCC_APB1Periph_TIM2 为TIM2时钟 ,这里的意思是使能TIM4时钟
- //Step2. GPIO做相应设置,为AF输出,使能TIM时钟
- //PA.0,1,2,3,8,9,10,11口设置为TIM1的OC1输出口
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|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;//端口速率为50Mhz
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- /* //PB.13/14口设置为TIM1_CH1N和TIM1_CH2N输出口
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOB, &GPIO_InitStructure); */
- }
- //Step3. TIM模块初始化
- void TIM_Configuration(void)
- {
- TIM_TimeBaseInitTypeDef TIM_BaseInitStructure;//初始化TIM的固定格式, 根据TIM_TimeBaseInitStruct中指定的参数初始化//TIMx的时间基数单位
- TIM_OCInitTypeDef TIM_OCInitStructure;// 根据TIM_OCInitStruct中指定的参数初始化外设TIMx
- TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
- //TIM1基本计数器设置(设置PWM频率)
- //频率=TIM1_CLK/(ARR+1) 频率为1khz
- TIM_BaseInitStructure.TIM_Period = 1000-1;
- TIM_BaseInitStructure.TIM_Prescaler = 72-1;
- TIM_BaseInitStructure.TIM_ClockDivision = 0;
- TIM_BaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
- TIM_BaseInitStructure.TIM_RepetitionCounter = 0;
- TIM_TimeBaseInit(TIM1, &TIM_BaseInitStructure);
-
- TIM_ARRPreloadConfig(TIM1, ENABLE);//启用ARR的影子寄存器(直到产生更新事件才更改设置)
- TIM_ARRPreloadConfig(TIM2, ENABLE); /* 使能 ARR装载 */
-
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
- // TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
- // TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
- // TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
-
- //TIM1_OC1模块设置(设置1通道占空比)
- TIM_OCInitStructure.TIM_Pulse = 100;
- TIM_OC1Init(TIM1, &TIM_OCInitStructure);
- TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);//启用CCR1寄存器的影子寄存器(直到产生更新事件才更改设置)
- //TIM1_OC2模块设置(设置2通道占空比)
- TIM_OCInitStructure.TIM_Pulse = 300;
- TIM_OC2Init(TIM1, &TIM_OCInitStructure);
- TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);//启用CCR2寄存器的影子寄存器(直到产生更新事件才更改设置)
- //TIM1_OC3模块设置(设置2通道占空比)
- TIM_OCInitStructure.TIM_Pulse = 600;
- TIM_OC3Init(TIM1, &TIM_OCInitStructure);
- TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);//启用CCR3寄存器的影子寄存器(直到产生更新事件才更改设置)
- //TIM1_OC3模块设置(设置2通道占空比)
- TIM_OCInitStructure.TIM_Pulse = 900;
- TIM_OC4Init(TIM1, &TIM_OCInitStructure);
- TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);//启用CCR2寄存器的影子寄存器(直到产生更新事件才更改设置)
-
-
- //死区设置
- TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
- TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
- TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
- TIM_BDTRInitStructure.TIM_DeadTime = 0x90; //这里调整死区大小0-0xff
- TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
- TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
- TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
- TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
-
- //TIM1基本计数器设置(设置PWM频率)
- //频率=TIM1_CLK/(ARR+1) 频率为1khz
- TIM_BaseInitStructure.TIM_Period = 1000-1;
- TIM_BaseInitStructure.TIM_Prescaler = 72-1;
- TIM_BaseInitStructure.TIM_ClockDivision = 0;
- TIM_BaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
- TIM_BaseInitStructure.TIM_RepetitionCounter = 0;
- TIM_TimeBaseInit(TIM2, &TIM_BaseInitStructure);
-
- /* TIM_Pulse用来控制占空比,他实际影响TIM的CCR2寄存器,程序中可随时更改该寄存器的值,可随时更改占空比。占空比=(CCRx/ARR)*100。*/
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; /* 输出模式 */ //其中,TIM_OCMode选择定时器模式,TIM_OCMode_PWM1 ,TIM脉冲宽度调制模式1
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //状态使能
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//TIM_OCPolarity输出极性,其输出极性为高
-
- TIM_OCInitStructure.TIM_Pulse =100;//TIM_Pulse设置了待装入捕获比较寄存器的脉冲值
- TIM_OC1Init(TIM2, &TIM_OCInitStructure);
- TIM_OCInitStructure.TIM_Pulse =300;//TIM_Pulse设置了待装入捕获比较寄存器的脉冲值
- TIM_OC2Init(TIM2, &TIM_OCInitStructure);
-
- TIM_OCInitStructure.TIM_Pulse =600;//TIM_Pulse设置了待装入捕获比较寄存器的脉冲值
- TIM_OC3Init(TIM2, &TIM_OCInitStructure);
- TIM_OCInitStructure.TIM_Pulse =900;//TIM_Pulse设置了待装入捕获比较寄存器的脉冲值
- TIM_OC4Init(TIM2, &TIM_OCInitStructure);
- TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable); //TIM_OC1PreloadConfig使能或者失能TIMx在CCR1上的预装载寄存器
- TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable); /* 使能TIM2在CCR2的预装储存器 *///CCR2为捕获/比较寄存器2
- TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable); /* 使能TIM2在CCR3的预装储存器 *///CCR3为捕获/比较寄存器2
- TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Enable); /* 使能TIM2在CCR4的预装储存器 *///CCR4为捕获/比较寄存器2
- //TIM1,2开启
- TIM_Cmd(TIM1, ENABLE);
- TIM_Cmd(TIM2, ENABLE);
- //TIM1_OC通道输出PWM(一定要加)
- TIM_CtrlPWMOutputs(TIM1, ENABLE);
- }
-
- main(void)
- {
-
- SystemInit(); //系统所有外设初始化
- GPIO_Configuration(); //所有端口外设配置初始化
- TIM_Configuration();
- while (1);
- }
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