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项目中需要对步进电机进行较为精准的控制。经过查找资料,可以通过对STM32的定时器采用主从定时器的模式。由主定时器输出方波信号,从定时器对主定时器输出的脉冲进行计数,溢出时触发从定时器的中断服务函数。以此达到控制步进电机转动的圈数的目的。
本文所采用的STM32开发板是正点原子的STM32F103(精英板)、STM32F407(探索者),参考资料多来自正点原子资料下载中心(http://www.openedv.com/docs/index.html)。我依然处于刚入门学习STM32的阶段,程序是在正点原子的例程的基础上修改的。 原理/思路
下图,表74,表78,来自《STM32中文参考手册》P237,P285;适用于STM32F103。 下图,表72,表79,来自《STM32F4xx中文参考手册》P370,P464;适用于STM32F407。
代码实现 “主从定时器是高级定时器和通用定时器的组合”,程序上会与“主从定时器都是通用定时器的组合”略有区别。 STM32F103:主要对定时器配置进行展示 timer.h #ifndef __TIMER_H #define __TIMER_H #include "stm32f10x.h" /* Group A: TIM1 - 主定时器,TIM2 - 从定时器 TIM1: CH1 - PA8, CH4 - PA11 RCC_APB2Periph_TIM1 TIM2: RCC_APB1Periph_TIM2 Group B: TIM5 - 主定时器,TIM8 - 从定时器 TIM5: CH1 - PA0, CH2 - PA1 RCC_APB1Periph_TIM5 TIM8: RCC_APB2Periph_TIM8 Group C: TIM3 - 主定时器,TIM4 - 从定时器 TIM3: CH1 - PA6, CH2 - PA7 RCC_APB1Periph_TIM3 TIM4: RCC_APB1Periph_TIM4 */ /*****定时器初始化函数*****/ // Group A void TIM1_GPIO_Config(uint16_t TIM1_Prescaler, uint16_t TIM1_Period, uint16_t CCR_A, uint16_t DIR_A); void TIM2_GPIO_Config(u32 PulseNum_A); void PWM_Output_A(u16 Cycle_A, u32 PulseNum_A, u16 DIR_A); void TIM2_IRQHandler(void); // Group B void TIM5_GPIO_Config(uint16_t TIM5_Prescaler, uint16_t TIM5_Period, uint16_t CCR_B, uint16_t DIR_B); void TIM8_GPIO_Config(u32 PulseNum_B); void PWM_Output_B(u16 Cycle_B, u32 PulseNum_B, u16 DIR_B); void TIM8_UP_IRQHandler(void); // Group C void TIM3_GPIO_Config(uint16_t TIM3_Prescaler, uint16_t TIM3_Period, uint16_t CCR_C, uint16_t DIR_C); void TIM4_GPIO_Config(u32 PulseNum_C); void PWM_Output_C(u16 Cycle_C, u32 PulseNum_C, u16 DIR_C); void TIM4_IRQHandler(void); #endif /* __TIMER_H */ timer.c #include "timer.h" /*********** Group A ***********/ // 定时器1主模式 void TIM1_GPIO_Config(uint16_t TIM1_Prescaler, uint16_t TIM1_Period, uint16_t CCR_A, uint16_t DIR_A) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_TIM1, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_11; // TIM1_CH1 - PA8, CH4 - PA11 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); TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_TimeBaseStructure.TIM_Period = TIM1_Period - 1; TIM_TimeBaseStructure.TIM_Prescaler = TIM1_Prescaler - 1; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; // 重复计数,一定要 = 0; 高级定时器TIM1,TIM8,这句必须有。 TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); TIM_OCInitTypeDef TIM_OCInitStructure; // 设置工作模式 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; // PWM1 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; // 比较输出使能 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; // 输出极性 // PWM通道,TIM1 - 通道1设置函数,50/100,脉冲信号 TIM_OCInitStructure.TIM_Pulse = CCR_A; // 设置待装入捕获寄存器的脉冲值 TIM_OC1Init( TIM1, &TIM_OCInitStructure); TIM_SelectMasterSlaveMode( TIM1, TIM_MasterSlaveMode_Enable); // 主从模式下,作为主定时器使能 TIM_SelectOutputTrigger( TIM1, TIM_TRGOSource_Update); // TIM - EGR寄存器, 定义UG位,产生更新事件 TIM_OC1PreloadConfig( TIM1, TIM_OCPreload_Enable); // PWM通道,TIM1 - 通道4设置函数,100/100 or 0/100,方向信号 TIM_OCInitStructure.TIM_Pulse = DIR_A; // 初始化 TIM1-OC4 TIM_OC4Init( TIM1, &TIM_OCInitStructure); // CH4预装载使能,修改 TIM_OC4PreloadConfig( TIM1, TIM_OCPreload_Enable); TIM_ARRPreloadConfig(TIM1, ENABLE); // 预装载使能 } //定时器2从模式 void TIM2_GPIO_Config(u32 PulseNum_A) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM2, ENABLE); TIM_TimeBaseStructure.TIM_Period = PulseNum_A; TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; // 向上计数 TIM_TimeBaseInit( TIM2, &TIM_TimeBaseStructure); TIM_SelectInputTrigger( TIM2, TIM_TS_ITR0); // TIM1-主,TIM2-从,表中对应 ITR0 TIM_SelectSlaveMode( TIM2, TIM_SlaveMode_External1); //主从模式下作为从定时器使能 TIM_ITConfig( TIM2, TIM_IT_Update, DISABLE); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3); NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init( &NVIC_InitStructure); } // Cycle_A = Preiod_A; PulseNum_A 输出脉冲个数; DIR_A 高/低电平-方向信号 void PWM_Output_A(u16 Cycle_A, u32 PulseNum_A, u16 DIR_A) // TIM1-主,TIM2-从,输出PWM { TIM2_GPIO_Config(PulseNum_A); TIM_Cmd( TIM2, ENABLE); TIM_ClearITPendingBit( TIM2, TIM_IT_Update); TIM_ITConfig( TIM2, TIM_IT_Update, ENABLE); TIM1_GPIO_Config( 72, Cycle_A, Cycle_A / 2, DIR_A); // 72M / 72 = 1MHz; TIM_Cmd( TIM1, ENABLE); TIM_CtrlPWMOutputs( TIM1, ENABLE); // 高级定时器必须有,使能其输出 } /*********** Group B ***********/ // 定时器5主模式 void TIM5_GPIO_Config(uint16_t TIM5_Prescaler, uint16_t TIM5_Period, uint16_t CCR_B, uint16_t DIR_B) { GPIO_InitTypeDef GPIO_InitStructure; // TIM5通道12 RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM5, ENABLE); RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1; // TIM5: CH1 - PA0, CH2 - PA1 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); TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; // 时钟频率设置 TIM_TimeBaseStructure.TIM_Period = TIM5_Period - 1; TIM_TimeBaseStructure.TIM_Prescaler = TIM5_Prescaler - 1; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit( TIM5, &TIM_TimeBaseStructure); TIM_OCInitTypeDef TIM_OCInitStructure; // 设置工作模式 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; // 设置工作模式是PWM,且为PWM1工作模式,TIMx_CNT TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; // 输出极性 // PWM通道,TIM5 - 通道1设置函数,50/100,脉冲信号 TIM_OCInitStructure.TIM_Pulse = CCR_B; // 设置待装入捕获寄存器的脉冲值 TIM_OC1Init( TIM5, &TIM_OCInitStructure); // 初始化 TIM5-OC1 TIM_SelectMasterSlaveMode( TIM5, TIM_MasterSlaveMode_Enable); // 定时器主从模式使能 TIM_SelectOutputTrigger( TIM5, TIM_TRGOSource_Update); // 选择触发方式:使用更新事件作为触发输出 TIM_OC1PreloadConfig( TIM5, TIM_OCPreload_Enable); // CH1预装载使能,修改 // PWM通道,TIM5 - 通道2设置函数,100/100 or 0/100,方向信号 TIM_OCInitStructure.TIM_Pulse = DIR_B; // 初始化 TIM5-OC2 TIM_OC2Init( TIM5, &TIM_OCInitStructure); // CH2预装载使能,修改 TIM_OC2PreloadConfig( TIM5, TIM_OCPreload_Enable); TIM_ARRPreloadConfig( TIM5, ENABLE); // 使能ARR预装载寄存器 } //定时器8从模式 void TIM8_GPIO_Config(u32 PulseNum_B) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB2PeriphClockCmd( RCC_APB2Periph_TIM8, ENABLE); TIM_TimeBaseStructure.TIM_Period = PulseNum_B; TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit( TIM8, &TIM_TimeBaseStructure); TIM_SelectInputTrigger( TIM8, TIM_TS_ITR3); // TIM5-主,TIM8-从 ITR3 TIM_SelectSlaveMode( TIM8, TIM_SlaveMode_External1); TIM_ITConfig( TIM8, TIM_IT_Update, DISABLE); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3); NVIC_InitStructure.NVIC_IRQChannel = TIM8_UP_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init( &NVIC_InitStructure); } // Cycle_B = Preiod_B; PulseNum_B 输出脉冲个数; DIR_B 高/低电平-方向信号 void PWM_Output_B(u16 Cycle_B, u32 PulseNum_B, u16 DIR_B) // TIM5-主,TIM8-从 { TIM8_GPIO_Config(PulseNum_B); TIM_Cmd( TIM8, ENABLE); TIM_ClearITPendingBit( TIM8, TIM_IT_Update); TIM_ITConfig( TIM8, TIM_IT_Update, ENABLE); TIM5_GPIO_Config( 72, Cycle_B, Cycle_B / 2, DIR_B); TIM_Cmd( TIM5, ENABLE); } /*********** Group C ***********/ // 定时器3主模式 void TIM3_GPIO_Config(uint16_t TIM3_Prescaler, uint16_t TIM3_Period, uint16_t CCR_C, uint16_t DIR_C) { GPIO_InitTypeDef GPIO_InitStructure; // TIM3通道12 RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM3, ENABLE); RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; // TIM3_CH1 PA6, CH2 - PA7 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); TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; // 时钟频率设置 TIM_TimeBaseStructure.TIM_Period = TIM3_Period - 1; TIM_TimeBaseStructure.TIM_Prescaler = TIM3_Prescaler - 1; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit( TIM3, &TIM_TimeBaseStructure); TIM_OCInitTypeDef TIM_OCInitStructure; // 设置工作模式 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; // 设置工作模式是PWM,且为PWM1工作模式,TIMx_CNT TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; // 输出极性 // PWM通道,TIM3 - 通道1设置函数,50/100 TIM_OCInitStructure.TIM_Pulse = CCR_C ; // 设置待装入捕获寄存器的脉冲值 TIM_OC1Init( TIM3, &TIM_OCInitStructure); // 初始化 TIM3-OC1 TIM_SelectMasterSlaveMode( TIM3, TIM_MasterSlaveMode_Enable); // 定时器主从模式使能 TIM_SelectOutputTrigger( TIM3, TIM_TRGOSource_Update); // 选择触发方式:使用更新事件作为触发输出 TIM_OC1PreloadConfig( TIM3, TIM_OCPreload_Enable); // CH1预装载使能,修改 // PWM通道,TIM3 - 通道2设置函数,100/100 or 0/100 TIM_OCInitStructure.TIM_Pulse = DIR_C; // 初始化 TIM3-OC2 TIM_OC2Init( TIM3, &TIM_OCInitStructure); // CH2预装载使能,修改 TIM_OC2PreloadConfig( TIM3, TIM_OCPreload_Enable); TIM_ARRPreloadConfig( TIM3, ENABLE); // 使能ARR预装载寄存器 } // 定时器4从模式 void TIM4_GPIO_Config(u32 PulseNum_C) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); TIM_TimeBaseStructure.TIM_Period = PulseNum_C; TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit( TIM4, &TIM_TimeBaseStructure); TIM_SelectInputTrigger( TIM4, TIM_TS_ITR2); // TIM3-主,TIM4-从 ITR2 TIM_SelectSlaveMode( TIM4,TIM_SlaveMode_External1 ); // 等同 TIM4->SMCR |= 0x07 TIM_ITConfig( TIM4, TIM_IT_Update, DISABLE); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3); NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); } // Cycle_C = Preiod_C; PulseNum_C 输出脉冲个数; DIR_C 高/低电平-方向信号 void PWM_Output_C(u16 Cycle_C, u32 PulseNum_C, u16 DIR_C) // TIM3-主,TIM4-从 { TIM4_GPIO_Config(PulseNum_C); TIM_Cmd( TIM4, ENABLE); TIM_ClearITPendingBit( TIM4, TIM_IT_Update); TIM_ITConfig( TIM4, TIM_IT_Update, ENABLE); TIM3_GPIO_Config(72, Cycle_C, Cycle_C / 2, DIR_C); TIM_Cmd( TIM3, ENABLE); } // Group A void TIM2_IRQHandler(void) { if (TIM_GetITStatus( TIM2, TIM_IT_Update) != RESET) { TIM_ClearITPendingBit( TIM2, TIM_IT_Update); // 清除中断标志位 TIM_CtrlPWMOutputs( TIM1, DISABLE); // 主 输出使能关闭,高级定时器必须有 TIM_Cmd( TIM1, DISABLE); // 关闭定时器1 TIM_Cmd( TIM2, DISABLE); // 关闭定时器2 TIM_ITConfig( TIM2, TIM_IT_Update, DISABLE); } } // Group B void TIM8_UP_IRQHandler(void) { if (TIM_GetITStatus( TIM8, TIM_IT_Update) != RESET) { TIM_ClearITPendingBit( TIM8, TIM_IT_Update); // 清除中断标志位 TIM_Cmd( TIM5, DISABLE); // 关闭定时器5 TIM_Cmd( TIM8, DISABLE); // 关闭定时器8 TIM_ITConfig( TIM8, TIM_IT_Update, DISABLE); } } // Group C void TIM4_IRQHandler(void) { if (TIM_GetITStatus( TIM4, TIM_IT_Update) != RESET) { TIM_ClearITPendingBit( TIM4, TIM_IT_Update); // 清除中断标志位 TIM_Cmd( TIM3, DISABLE); // 关闭定时器3 TIM_Cmd( TIM4, DISABLE); // 关闭定时器4 TIM_ITConfig( TIM4, TIM_IT_Update, DISABLE); } } main.c /** ****************************************************************************** * @file main.c * @author SieYuan * @version V1.0 * @date 2020-12-09 * @brief 配置主从定时器,输出精确脉冲个数的PWM波 * ****************************************************************************** */ #include "stm32f10x.h" #include "timer.h" // 主从定时器配置 #include "led.h" #include "exti.h" #include "delay.h" int main(void) { // 初始化 LED_Init(); KEY_Init(); EXTIx_Init(); // 初始化完成 LED1(0); delay_ms(500); LED1(1); delay_ms(500); LED1(0); delay_ms(500); LED1(1); PWM_Output_A(1000, 10, 1000); // 72M / 72 = 1MHz, 1M / 1k = 1kHz PWM_Output_B(500, 10, 0); // 72M / 72 = 1MHz, 1M / 500 = 2kHz PWM_Output_C(100, 10, 0); // 72M / 72 = 1MHz, 1M / 100 = 10kHz while (1); } 注意事项1:高级定时器作为主定时器,如在 TIM1_GPIO_Config() 函数中需要配置: TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; 大家可以右键 Go To Definition,当采用 TIM1 和 TIM8 时,TIM_RepetitionCounter 才有效。它的作用是当从定时器对脉冲计数溢出时,会产生一个更新事件使得 高级定时器TIM1和TIM8 重复计数寄存器(TIMx_RCR)的REP值减1。当REP_CNT = 0时,又会产生一个更新事件并且计数器REP_CNT重新从设定的REP值开始计数(向下计数)。也就是说,TIM_RepetitionCounter = 0, 从定时器溢出1次(REP+1)就会进入中断;如果设置 TIM_RepetitionCounter = 1, 从定时器溢出2次(REP+1)才会进入中断,如例程中产生20(10*2)次脉冲才会停止。具体规范地说明,参考 stm32f10x_tim.h 或《STM32中文参考手册》P246,如下图。
TIM_CtrlPWMOutputs( TIM1, ENABLE);大家依然可以右键 Go To Definition,当采用 TIM1 和 TIM8 时,要在刹车和死区寄存器(TIMx_BDTR)中使能MOE。具体规范地说明,参考 stm32f10x_tim.c 或《STM32中文参考手册》P248,如下图。
Timer.h #ifndef __TIMER_H #define __TIMER_H #include "sys.h" /* Group A: TIM1 - 主定时器,TIM2 - 从定时器 TIM1: CH3 - PE13, CH4 - PE14 RCC_APB2Periph_TIM1, RCC_AHB1Periph_GPIOE TIM2: TIM2: RCC_APB1Periph_TIM2 Group B: TIM4 - 主定时器,TIM8 - 从定时器 TIM4: CH1 - PB6, CH2 - PB7 RCC_APB1Periph_TIM4 TIM8: RCC_APB2Periph_TIM8 Group C: TIM3 - 主定时器,TIM4 - 从定时器 TIM3: TIM3: CH3 - PB0, CH4 - PB1 RCC_APB1Periph_TIM3 TIM5: RCC_APB1Periph_TIM5 */ /*****定时器初始化函数*****/ // Group A void TIM1_GPIO_Config(u16 TIM1_Prescaler, u16 TIM1_Period, u16 CCR_A, u16 DIR_A); void TIM2_GPIO_Config(u32 PulseNum_A); void PWM_Output_A(u16 Cycle_A, u32 PulseNum_A, u16 DIR_A); void TIM2_IRQHandler(void); // Group B void TIM4_GPIO_Config(u16 TIM4_Prescaler, u16 TIM4_Period, u16 CCR_B, u16 DIR_B); void TIM8_GPIO_Config(u32 PulseNum_B); void PWM_Output_B(u16 Cycle_B, u32 PulseNum_B, u16 DIR_B); void TIM8_UP_TIM13_IRQHandler(void); // Group C void TIM3_GPIO_Config(u16 TIM3_Prescaler, u16 TIM3_Period, u16 CCR_C, u16 DIR_C); void TIM5_GPIO_Config(u32 PulseNum_C); void PWM_Output_C(u16 Cycle_C, u32 PulseNum_C, u16 DIR_C); void TIM5_IRQHandler(void); #endif /* __TIMER_H */ /****************************END OF FILE****************************/ Timer.c #include "Timer.h" /*********** Group A ***********/ // 定时器1主模式 void TIM1_GPIO_Config(u16 TIM1_Prescaler, u16 TIM1_Period, u16 CCR_A, u16 DIR_A) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd( RCC_APB2Periph_TIM1, ENABLE); RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOE, ENABLE); // F407: GPIO 串口初始化 与F103不同 GPIO_PinAFConfig( GPIOE, GPIO_PinSource13, GPIO_AF_TIM1); // F407 端口复用映射 GPIO_PinAFConfig( GPIOE, GPIO_PinSource14, GPIO_AF_TIM1); // F407 端口复用映射 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14; // TIM1_CH1 - PE13, CH4 - PE14 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; // 复用 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // 推挽复用输出 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; // 上拉 GPIO_Init(GPIOE, &GPIO_InitStructure); TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_TimeBaseStructure.TIM_Period = TIM1_Period - 1; TIM_TimeBaseStructure.TIM_Prescaler = TIM1_Prescaler - 1; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; // 重复计数,一定要 = 0 TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); TIM_OCInitTypeDef TIM_OCInitStructure; // 设置工作模式 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; // PWM1 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; // 比较输出使能 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; // 输出极性 // PWM通道,TIM1 - 通道1设置函数,50/100 TIM_OCInitStructure.TIM_Pulse = CCR_A; // 设置待装入捕获寄存器的脉冲值 TIM_OC3Init( TIM1, &TIM_OCInitStructure); TIM_SelectMasterSlaveMode( TIM1, TIM_MasterSlaveMode_Enable); TIM_SelectOutputTrigger( TIM1, TIM_TRGOSource_Update); TIM_OC3PreloadConfig( TIM1, TIM_OCPreload_Enable); // PWM通道,TIM1 - 通道4设置函数,100/100 or 0/100 TIM_OCInitStructure.TIM_Pulse = DIR_A; // 初始化 TIM1-OC4 TIM_OC4Init( TIM1, &TIM_OCInitStructure); // CH4预装载使能,修改 TIM_OC4PreloadConfig( TIM1, TIM_OCPreload_Enable); TIM_ARRPreloadConfig(TIM1, ENABLE); } //定时器2从模式 void TIM2_GPIO_Config(u32 PulseNum_A) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM2, ENABLE); TIM_TimeBaseStructure.TIM_Period = PulseNum_A; TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit( TIM2, &TIM_TimeBaseStructure); TIM_SelectInputTrigger( TIM2, TIM_TS_ITR0); // TIM1-主,TIM2-从 TIM_SelectSlaveMode( TIM2, TIM_SlaveMode_External1); TIM_ITConfig( TIM2, TIM_IT_Update, DISABLE); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3); NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init( &NVIC_InitStructure); } void PWM_Output_A(u16 Cycle_A, u32 PulseNum_A, u16 DIR_A) // TIM1-主,TIM2-从 { TIM2_GPIO_Config(PulseNum_A); TIM_Cmd( TIM2, ENABLE); TIM_ClearITPendingBit( TIM2, TIM_IT_Update); TIM_ITConfig( TIM2, TIM_IT_Update, ENABLE); TIM1_GPIO_Config( 84, Cycle_A, Cycle_A / 2, DIR_A); //F407: 高级定时器是 168MHz, 故168MHz / 84 = 2MHz TIM_Cmd( TIM1, ENABLE); TIM_CtrlPWMOutputs( TIM1, ENABLE); // 高级定时器 TIM1 使能 MOE } /*********** Group B ***********/ // 定时器4主模式 void TIM4_GPIO_Config(u16 TIM4_Prescaler, u16 TIM4_Period, u16 CCR_B, u16 DIR_B) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM4, ENABLE); RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOB, ENABLE); // F407: GPIO 串口初始化 与F103不同 GPIO_PinAFConfig( GPIOB, GPIO_PinSource6, GPIO_AF_TIM5); // F407 端口复用映射 GPIO_PinAFConfig( GPIOB, GPIO_PinSource7, GPIO_AF_TIM5); // F407 端口复用映射 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; // TIM4_CH3 PB0, CH4 - PB1 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; // 复用推挽输出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_Init(GPIOB, &GPIO_InitStructure); TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; // 时钟频率设置 TIM_TimeBaseStructure.TIM_Period = TIM4_Period - 1; TIM_TimeBaseStructure.TIM_Prescaler = TIM4_Prescaler - 1; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit( TIM4, &TIM_TimeBaseStructure); TIM_OCInitTypeDef TIM_OCInitStructure; // 设置工作模式 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; // 设置工作模式是PWM,且为PWM1工作模式,TIMx_CNT TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; // 输出极性 // PWM通道,TIM4 - 通道1设置函数,50/100 TIM_OCInitStructure.TIM_Pulse = CCR_B; // 设置待装入捕获寄存器的脉冲值 TIM_OC1Init( TIM4, &TIM_OCInitStructure); // 初始化 TIM4-OC3 TIM_SelectMasterSlaveMode( TIM4, TIM_MasterSlaveMode_Enable); // 定时器主从模式使能 TIM_SelectOutputTrigger( TIM4, TIM_TRGOSource_Update); // 选择触发方式:使用更新事件作为触发输出 TIM_OC1PreloadConfig( TIM4, TIM_OCPreload_Enable); // CH1预装载使能,修改 // PWM通道,TIM4 - 通道2设置函数,100/100 or 0/100 TIM_OCInitStructure.TIM_Pulse = DIR_B; // 初始化 TIM4-OC4 TIM_OC2Init( TIM4, &TIM_OCInitStructure); // CH2预装载使能,修改 TIM_OC2PreloadConfig( TIM4, TIM_OCPreload_Enable); TIM_ARRPreloadConfig( TIM4, ENABLE); // 使能ARR预装载寄存器 } //定时器8从模式 void TIM8_GPIO_Config(u32 PulseNum_B) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB2PeriphClockCmd( RCC_APB2Periph_TIM8, ENABLE); TIM_TimeBaseStructure.TIM_Period = PulseNum_B; TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit( TIM8, &TIM_TimeBaseStructure); TIM_SelectInputTrigger( TIM8, TIM_TS_ITR2); // TIM2-主,TIM4-从 TIM_SelectSlaveMode( TIM8, TIM_SlaveMode_External1); TIM_ITConfig( TIM8, TIM_IT_Update, DISABLE); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3); NVIC_InitStructure.NVIC_IRQChannel = TIM8_UP_TIM13_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init( &NVIC_InitStructure); } void PWM_Output_B(u16 Cycle_B, u32 PulseNum_B, u16 DIR_B) // TIM2-主,TIM4-从 { TIM8_GPIO_Config(PulseNum_B); TIM_Cmd( TIM8, ENABLE); TIM_ClearITPendingBit( TIM8, TIM_IT_Update); TIM_ITConfig( TIM8, TIM_IT_Update, ENABLE); TIM4_GPIO_Config( 84, Cycle_B, Cycle_B / 2, DIR_B); //F407:通用定时器是 84MHz, 故84MHz / 84 = 1MHz TIM_Cmd( TIM4, ENABLE); } /*********** Group C ***********/ // 定时器3主模式 void TIM3_GPIO_Config(u16 TIM3_Prescaler, u16 TIM3_Period, u16 CCR_C, u16 DIR_C) { GPIO_InitTypeDef GPIO_InitStructure; // TIM3通道12 - PWM Z轴步进电机脉冲信号 RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM3, ENABLE); RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOB, ENABLE); // F407: GPIO 串口初始化 与F103不同 GPIO_PinAFConfig( GPIOB, GPIO_PinSource0, GPIO_AF_TIM3); // F407 端口复用映射 GPIO_PinAFConfig( GPIOB, GPIO_PinSource1, GPIO_AF_TIM3); // F407 端口复用映射 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1; // TIM3_CH1 PA6, CH2 - PA7 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; // 复用推挽输出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_Init(GPIOB, &GPIO_InitStructure); TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; // 时钟频率设置 TIM_TimeBaseStructure.TIM_Period = TIM3_Period - 1; TIM_TimeBaseStructure.TIM_Prescaler = TIM3_Prescaler - 1; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit( TIM3, &TIM_TimeBaseStructure); TIM_OCInitTypeDef TIM_OCInitStructure; // 设置工作模式 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; // 设置工作模式是PWM,且为PWM1工作模式,TIMx_CNT TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; // 输出极性 // PWM通道,TIM3 - 通道1设置函数,50/100 TIM_OCInitStructure.TIM_Pulse = CCR_C; // 设置待装入捕获寄存器的脉冲值 TIM_OC3Init( TIM3, &TIM_OCInitStructure); // 初始化 TIM3-OC1 TIM_SelectMasterSlaveMode( TIM3, TIM_MasterSlaveMode_Enable); // 定时器主从模式使能 TIM_SelectOutputTrigger( TIM3, TIM_TRGOSource_Update); // 选择触发方式:使用更新事件作为触发输出 TIM_OC3PreloadConfig( TIM3, TIM_OCPreload_Enable); // CH1预装载使能,修改 // PWM通道,TIM3 - 通道2设置函数,100/100 or 0/100 TIM_OCInitStructure.TIM_Pulse = DIR_C; // 初始化 TIM3-OC2 TIM_OC4Init( TIM3, &TIM_OCInitStructure); // CH2预装载使能,修改 TIM_OC4PreloadConfig( TIM3, TIM_OCPreload_Enable); TIM_ARRPreloadConfig( TIM3, ENABLE); // 使能ARR预装载寄存器 } // 定时器5从模式 void TIM5_GPIO_Config(u32 PulseNum_Z) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); TIM_TimeBaseStructure.TIM_Period = PulseNum_Z; TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit( TIM5, &TIM_TimeBaseStructure); TIM_SelectInputTrigger( TIM5, TIM_TS_ITR1); TIM_SelectSlaveMode( TIM5,TIM_SlaveMode_External1 ); // 等同下一句 TIM5->SMCR |= 0x07 TIM_ITConfig( TIM5, TIM_IT_Update, DISABLE); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3); NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); } void PWM_Output_C(u16 Cycle_C, u32 PulseNum_C, u16 DIR_C) // TIM3-主,TIM5-从 { TIM5_GPIO_Config(PulseNum_C); TIM_Cmd( TIM5, ENABLE); TIM_ClearITPendingBit( TIM5, TIM_IT_Update); TIM_ITConfig( TIM5, TIM_IT_Update, ENABLE); TIM3_GPIO_Config( 56, Cycle_C, Cycle_C / 2, DIR_C); //84MHz / 56 = 1.5MHz TIM_Cmd( TIM3, ENABLE); } // Group A void TIM2_IRQHandler(void) { if (TIM_GetITStatus( TIM2, TIM_IT_Update) != RESET) { TIM_ClearITPendingBit( TIM2, TIM_IT_Update); // 清除中断标志位 TIM_CtrlPWMOutputs( TIM1, DISABLE); // 高级定时器 TIM1 关闭MOE TIM_Cmd( TIM1, DISABLE); // 关闭定时器1 TIM_Cmd( TIM2, DISABLE); // 关闭定时器2 TIM_ITConfig( TIM2, TIM_IT_Update, DISABLE); } } // Group B void TIM8_UP_TIM13_IRQHandler(void) { if (TIM_GetITStatus( TIM8, TIM_IT_Update) != RESET) { TIM_ClearITPendingBit( TIM8, TIM_IT_Update); // 清除中断标志位 TIM_Cmd( TIM4, DISABLE); // 关闭定时器4 TIM_Cmd( TIM8, DISABLE); // 关闭定时器8 TIM_ITConfig( TIM8, TIM_IT_Update, DISABLE); } } // Group C void TIM5_IRQHandler(void) { if (TIM_GetITStatus( TIM5, TIM_IT_Update) != RESET) { TIM_ClearITPendingBit( TIM5, TIM_IT_Update); // 清除中断标志位 TIM_Cmd( TIM3, DISABLE); // 关闭定时器3 TIM_Cmd( TIM5, DISABLE); // 关闭定时器5 TIM_ITConfig( TIM5, TIM_IT_Update, DISABLE); } } /****************************END OF FILE****************************/ main.c /** ************************************************************************************** * @file main.c * @author SieYuan * @version V1.0 * @date 2020-12-09 * @brief 配置主从定时器,输出精确脉冲个数的PWM波 * ************************************************************************************** */ #include "sys.h" #include "led.h" #include "key.h" #include "exti.h" #include "Timer.h" #include "delay.h" int main(void) { /* 程序初始化:对【LED】【KEY】【EXIT】【USART】*/ LED_Init(); KEY_Init(); EXTIx_Init(); delay_init(168); LED1 = 0; delay_ms(500); LED1 = 1; delay_ms(500); LED1 = 0; delay_ms(500); LED1 = 1; /* 程序初始化完成 !*/ PWM_Output_A(1000, 10, 1000); // 168M / 84 = 2MHz, 2M / 1000 = 2kHz PWM_Output_B(100, 10, 0); // 84M / 84 = 1MHz, 1M / 100 = 10kHz PWM_Output_C(1000, 10, 0); // 84M / 56 = 1.5MHz, 1.5M / 1000 = 1.5kHz while(1); } /****************************END OF FILE****************************/
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