本帖最后由 wangjie1221 于 2016-12-8 12:46 编辑
L298N驱动两个电机调速,利用定时器4输出四路PWM,通道1:PB6,通道2:PB7,通道3:PB8,通道4:PB9 。PB6和PB7控制一个电机,PB8和PB9控制另个电机 当KEY1按下同时输出占空比100%的方波,当按下KEY2按下同时输出占空比50%方波。 两个波形都正确,但是当我按下复位键且没有按下KEY2时,用万用表测量PB8和PB9的电压就输出负的电源电压,请问为什么????急需要解决! - [/font][/align][align=left][font=宋体][align=left]#include "stm32f10x.h"[/align][align=left]#define TIM2_GPIO1_Pin GPIO_Pin_6 //前左INT1 [/align][align=left]#define TIM2_GPIO1_Port GPIOB[/align][align=left]#define TIM2_GPIO1_Clk RCC_APB2Periph_GPIOB[/align][align=left]#define TIM2_GPIO2_Pin GPIO_Pin_7 //前左INT2[/align][align=left]#define TIM2_GPIO2_Port GPIOB[/align][align=left]#define TIM2_GPIO2_Clk RCC_APB2Periph_GPIOB[/align][align=left]#define TIM2_GPIO3_Pin GPIO_Pin_8 //前右INT1[/align][align=left]#define TIM2_GPIO3_Port GPIOB[/align][align=left]#define TIM2_GPIO3_Clk RCC_APB2Periph_GPIOB[/align][align=left]#define TIM2_GPIO4_Pin GPIO_Pin_9 //前右INT2[/align][align=left]#define TIM2_GPIO4_Port GPIOB[/align][align=left]#define TIM2_GPIO4_Clk RCC_APB2Periph_GPIOB[/align]
- [align=left]#define TIM3_GPIO1_Pin GPIO_Pin_6 //后左INT1[/align][align=left]#define TIM3_GPIO1_Port GPIOA[/align][align=left]#define TIM3_GPIO1_Clk RCC_APB2Periph_GPIOA[/align][align=left]#define TIM3_GPIO2_Pin GPIO_Pin_7 //后左INT2[/align][align=left]#define TIM3_GPIO2_Port GPIOA[/align][align=left]#define TIM3_GPIO2_Clk RCC_APB2Periph_GPIOA[/align][align=left]#define TIM3_GPIO3_Pin GPIO_Pin_0 //后右INT1[/align][align=left]#define TIM3_GPIO3_Port GPIOB[/align][align=left]#define TIM3_GPIO3_Clk RCC_APB2Periph_GPIOB[/align][align=left]#define TIM3_GPIO4_Pin GPIO_Pin_1 //后右INT2[/align][align=left]#define TIM3_GPIO4_Port GPIOB[/align][align=left]#define TIM3_GPIO4_Clk RCC_APB2Periph_GPIOB[/align][align=left]/********************基本定时器TIM参数定义,只限TIM6、7************/[/align][align=left]#define macTIMx2 TIM4[/align][align=left]#define macTIM_APBxClock_FUN2 RCC_APB1PeriphClockCmd[/align][align=left]#define macTIM_CLK2 RCC_APB1Periph_TIM4[/align][align=left]#define macTIM_IRQ2 TIM4_IRQn[/align][align=left]#define macTIM_INT_FUN2 TIM4_IRQHandler[/align]
- [align=left]#define macTIMx TIM3[/align][align=left]#define macTIM_APBxClock_FUN RCC_APB1PeriphClockCmd[/align][align=left]#define macTIM_CLK RCC_APB1Periph_TIM3[/align][align=left]#define macTIM_IRQ TIM3_IRQn[/align][align=left]#define macTIM_INT_FUN TIM3_IRQHandler[/align]
- [align=left][align=left]void TIM2_GPIO_Config(void)[/align][align=left]{[/align][align=left] GPIO_InitTypeDef TIM2_GPIO_InitStructure;[/align][align=left] //开GPIOB端口时钟[/align][align=left] RCC_APB2PeriphClockCmd(TIM2_GPIO1_Clk,ENABLE);[/align][align=left] //配置PB6口复用推免输出,速度10MHZ[/align][align=left] TIM2_GPIO_InitStructure.GPIO_Pin=TIM2_GPIO1_Pin; [/align][align=left] TIM2_GPIO_InitStructure.GPIO_Speed=GPIO_Speed_10MHz;[/align][align=left] TIM2_GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;[/align][align=left] GPIO_Init(TIM2_GPIO1_Port, &TIM2_GPIO_InitStructure);[/align]
- [align=left] //配置PB7口复用推免输出,速度10MHZ[/align][align=left] TIM2_GPIO_InitStructure.GPIO_Pin=TIM2_GPIO2_Pin;[/align][align=left] GPIO_Init(TIM2_GPIO2_Port, &TIM2_GPIO_InitStructure);[/align]
- [align=left] //配置PB8口复用推免输出,速度10MHZ[/align][align=left] TIM2_GPIO_InitStructure.GPIO_Pin=TIM2_GPIO3_Pin;[/align][align=left] GPIO_Init(TIM2_GPIO3_Port, &TIM2_GPIO_InitStructure);[/align][align=left] //配置PB9口复用推免输出,速度10MHZ[/align][align=left] TIM2_GPIO_InitStructure.GPIO_Pin=TIM2_GPIO4_Pin;[/align][align=left] GPIO_Init(TIM2_GPIO4_Port, &TIM2_GPIO_InitStructure);[/align][align=left]}[/align][align=left]static void TIM3_GPIO_Config(void)[/align][align=left]{[/align][align=left] GPIO_InitTypeDef TIM3_GPIO_InitStructure;[/align][align=left] //开GPIOA端口时钟[/align][align=left] RCC_APB2PeriphClockCmd(TIM3_GPIO1_Clk,ENABLE);[/align][align=left] //配置PA6口复用推免输出,速度10MHZ[/align][align=left] TIM3_GPIO_InitStructure.GPIO_Pin=TIM3_GPIO1_Pin; [/align][align=left] TIM3_GPIO_InitStructure.GPIO_Speed=GPIO_Speed_10MHz;[/align][align=left] TIM3_GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;[/align][align=left] GPIO_Init(TIM3_GPIO1_Port, &TIM3_GPIO_InitStructure);[/align][align=left] //配置PA7口复用推免输出,速度10MHZ[/align][align=left] TIM3_GPIO_InitStructure.GPIO_Pin=TIM3_GPIO2_Pin;[/align][align=left] GPIO_Init(TIM3_GPIO2_Port, &TIM3_GPIO_InitStructure);[/align][align=left] //打开GPIOB时钟[/align][align=left] RCC_APB2PeriphClockCmd(TIM3_GPIO3_Clk,ENABLE);[/align][align=left] //配置PB0口复用推免输出,速度10MHZ[/align][align=left] TIM3_GPIO_InitStructure.GPIO_Pin=TIM3_GPIO3_Pin;[/align][align=left] GPIO_Init(TIM3_GPIO3_Port, &TIM3_GPIO_InitStructure);[/align][align=left] //配置PB1口复用推免输出,速度10MHZ[/align][align=left] TIM3_GPIO_InitStructure.GPIO_Pin=TIM3_GPIO4_Pin;[/align][align=left] GPIO_Init(TIM3_GPIO4_Port, &TIM3_GPIO_InitStructure);[/align][align=left]}[/align]
- [align=left][align=left]static void TIM2_PWM100_QJConfig(void)[/align][align=left]{[/align][align=left] uint16_t CCR1_Val=1000; //B6占空比100%[/align][align=left] uint16_t CCR2_Val=0; //B7占空比0[/align][align=left] uint16_t CCR3_Val=1000; //B8占空比100%[/align][align=left] uint16_t CCR4_Val=0; //B9占空比0[/align][align=left] TIM_OCInitTypeDef TIM_OCInitStructure;[/align][align=left] //PWM模式配置[/align][align=left] //PWM1模式1[/align][align=left] TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;[/align][align=left] //PWM输出使能[/align][align=left] TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;[/align][align=left] TIM_OCInitStructure.TIM_Pulse=CCR1_Val;[/align][align=left] TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;[/align][align=left] //使能通道1[/align][align=left] TIM_OC1Init(macTIMx2,&TIM_OCInitStructure);[/align][align=left] TIM_OC1PreloadConfig(macTIMx2, TIM_OCPreload_Enable);[/align][align=left] //PWM2模式1[/align][align=left] TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;[/align][align=left] TIM_OCInitStructure.TIM_Pulse=CCR2_Val;[/align][align=left] //使能通道2[/align][align=left] TIM_OC2Init(macTIMx2,&TIM_OCInitStructure);[/align][align=left] TIM_OC2PreloadConfig(macTIMx2, TIM_OCPreload_Enable);[/align][align=left] //PWM3模式1[/align][align=left] TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;[/align][align=left] TIM_OCInitStructure.TIM_Pulse=CCR3_Val;[/align][align=left] //使能通道3[/align][align=left] TIM_OC3Init(macTIMx2,&TIM_OCInitStructure);[/align][align=left] TIM_OC3PreloadConfig(macTIMx2, TIM_OCPreload_Enable);[/align][align=left] //PWM4模式1[/align][align=left] TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;[/align][align=left] TIM_OCInitStructure.TIM_Pulse=CCR4_Val;[/align][align=left] //使能通道4[/align][align=left] TIM_OC4Init(macTIMx2,&TIM_OCInitStructure);[/align][align=left] TIM_OC4PreloadConfig(macTIMx2, TIM_OCPreload_Enable);[/align][align=left] [/align][align=left] TIM_ARRPreloadConfig(macTIMx2, ENABLE);[/align][align=left] TIM_Cmd(macTIMx2, ENABLE);[/align]
- [align=left]}[/align][align=left]static void TIM2_PWM50_QJConfig(void)[/align][align=left]{[/align][align=left] uint16_t CCR1_Val=500; //B6占空比50%[/align][align=left] uint16_t CCR2_Val=0; //B7占空比0[/align][align=left] uint16_t CCR3_Val=500; //B8占空比50%[/align][align=left] uint16_t CCR4_Val=0; //B9占空比0[/align][align=left] TIM_OCInitTypeDef TIM_OCInitStructure;[/align][align=left] //PWM模式配置[/align][align=left] //PWM1模式1[/align][align=left] TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;[/align][align=left] //PWM输出使能[/align][align=left] TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;[/align][align=left] TIM_OCInitStructure.TIM_Pulse=CCR1_Val;[/align][align=left] TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;[/align][align=left] //使能通道1[/align][align=left] TIM_OC1Init(macTIMx2,&TIM_OCInitStructure);[/align][align=left] TIM_OC1PreloadConfig(macTIMx2, TIM_OCPreload_Enable);[/align][align=left] //PWM2模式1[/align][align=left] TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;[/align][align=left] TIM_OCInitStructure.TIM_Pulse=CCR2_Val;[/align][align=left] //使能通道2[/align][align=left] TIM_OC2Init(macTIMx2,&TIM_OCInitStructure);[/align][align=left] TIM_OC2PreloadConfig(macTIMx2, TIM_OCPreload_Enable);[/align][align=left] //PWM3模式1[/align][align=left] TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;[/align][align=left] TIM_OCInitStructure.TIM_Pulse=CCR3_Val;[/align][align=left] //使能通道3[/align][align=left] TIM_OC3Init(macTIMx2,&TIM_OCInitStructure);[/align][align=left] TIM_OC3PreloadConfig(macTIMx2, TIM_OCPreload_Enable);[/align][align=left] //PWM4模式1[/align][align=left] TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;[/align][align=left] TIM_OCInitStructure.TIM_Pulse=CCR4_Val;[/align][align=left] //使能通道4[/align][align=left] TIM_OC4Init(macTIMx2,&TIM_OCInitStructure);[/align][align=left] TIM_OC4PreloadConfig(macTIMx2, TIM_OCPreload_Enable);[/align][align=left] [/align][align=left] TIM_ARRPreloadConfig(macTIMx2, ENABLE);[/align][align=left] TIM_Cmd(macTIMx2, ENABLE);[/align]
- [align=left]}[/align]
- [align=left][align=left]static void TIM3_PWM100_QJConfig(void)[/align][align=left]{[/align][align=left] uint16_t CCR1_Val=1000; //A6占空比100%[/align][align=left] uint16_t CCR2_Val=0; //A7占空比0[/align][align=left] uint16_t CCR3_Val=1000; //B0占空比100%[/align][align=left] uint16_t CCR4_Val=0; //B1占空比0[/align][align=left] TIM_OCInitTypeDef TIM_OCInitStructure;[/align][align=left] //PWM模式配置[/align][align=left] //PWM1模式1[/align][align=left] TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;[/align][align=left] //PWM输出使能[/align][align=left] TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;[/align][align=left] TIM_OCInitStructure.TIM_Pulse=CCR1_Val;[/align][align=left] TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;[/align][align=left] //使能通道1[/align][align=left] TIM_OC1Init(macTIMx,&TIM_OCInitStructure);[/align][align=left] TIM_OC1PreloadConfig(macTIMx, TIM_OCPreload_Enable);[/align][align=left] //PWM2模式1[/align][align=left] TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;[/align][align=left] TIM_OCInitStructure.TIM_Pulse=CCR2_Val;[/align][align=left] //使能通道2[/align][align=left] TIM_OC2Init(macTIMx,&TIM_OCInitStructure);[/align][align=left] TIM_OC2PreloadConfig(macTIMx, TIM_OCPreload_Enable);[/align][align=left] //PWM3模式1[/align][align=left] TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;[/align][align=left] TIM_OCInitStructure.TIM_Pulse=CCR3_Val;[/align][align=left] //使能通道3[/align][align=left] TIM_OC3Init(macTIMx,&TIM_OCInitStructure);[/align][align=left] TIM_OC3PreloadConfig(macTIMx, TIM_OCPreload_Enable);[/align][align=left] //PWM4模式1[/align][align=left] TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;[/align][align=left] TIM_OCInitStructure.TIM_Pulse=CCR4_Val;[/align][align=left] //使能通道4[/align][align=left] TIM_OC4Init(macTIMx,&TIM_OCInitStructure);[/align][align=left] TIM_OC4PreloadConfig(macTIMx, TIM_OCPreload_Enable);[/align][align=left] [/align][align=left] TIM_ARRPreloadConfig(macTIMx, ENABLE);[/align][align=left] TIM_Cmd(macTIMx, ENABLE);[/align]
- [align=left]}[/align][align=left]static void TIM3_PWM50_QJConfig(void)[/align][align=left]{[/align][align=left] uint16_t CCR1_Val=500; //A6占空比50%[/align][align=left] uint16_t CCR2_Val=0; //A7占空比0[/align][align=left] uint16_t CCR3_Val=500; //B0占空比50%[/align][align=left] uint16_t CCR4_Val=0; //B1占空比0[/align][align=left] TIM_OCInitTypeDef TIM_OCInitStructure;[/align][align=left] //PWM模式配置[/align][align=left] //PWM1模式1[/align][align=left] TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;[/align][align=left] //PWM输出使能[/align][align=left] TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;[/align][align=left] TIM_OCInitStructure.TIM_Pulse=CCR1_Val;[/align][align=left] TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;[/align][align=left] //使能通道1[/align][align=left] TIM_OC1Init(macTIMx,&TIM_OCInitStructure);[/align][align=left] TIM_OC1PreloadConfig(macTIMx, TIM_OCPreload_Enable);[/align][align=left] //PWM2模式1[/align][align=left] TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;[/align][align=left] TIM_OCInitStructure.TIM_Pulse=CCR2_Val;[/align][align=left] //使能通道2[/align][align=left] TIM_OC2Init(macTIMx,&TIM_OCInitStructure);[/align][align=left] TIM_OC2PreloadConfig(macTIMx, TIM_OCPreload_Enable);[/align][align=left] //PWM3模式1[/align][align=left] TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;[/align][align=left] TIM_OCInitStructure.TIM_Pulse=CCR3_Val;[/align][align=left] //使能通道3[/align][align=left] TIM_OC3Init(macTIMx,&TIM_OCInitStructure);[/align][align=left] TIM_OC3PreloadConfig(macTIMx, TIM_OCPreload_Enable);[/align][align=left] //PWM4模式1[/align][align=left] TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;[/align][align=left] TIM_OCInitStructure.TIM_Pulse=CCR4_Val;[/align][align=left] //使能通道4[/align][align=left] TIM_OC4Init(macTIMx,&TIM_OCInitStructure);[/align][align=left] TIM_OC4PreloadConfig(macTIMx, TIM_OCPreload_Enable);[/align][align=left] [/align][align=left] TIM_ARRPreloadConfig(macTIMx, ENABLE);[/align][align=left] TIM_Cmd(macTIMx, ENABLE);[/align]
- [align=left]}[/align]
- //电机正转,占空比为100%
- void QJTIM2_PWM100_Init(void)
- {
- TIM2_GPIO_Config();
- TIM2_100QJConfiguration();
- //TIMx_NVIC_Configuration();
- }
- void QJTIM3_PWM100_Init(void)
- {
- TIM3_GPIO_Config();
- TIM3_100QJConfiguration();
- //TIMx_NVIC_Configuration();
- }
- //电机正转,占空比为50%
- void QJTIM2_PWM50_Init(void)
- {
- TIM2_GPIO_Config();
- TIM2_50QJConfiguration();
- //TIMx_NVIC_Configuration();
- }
- void QJTIM3_PWM50_Init(void)
- {
- TIM3_GPIO_Config();
- TIM3_50QJConfiguration();
- //TIMx_NVIC_Configuration();
- }
- //主函数
- int main(void)
- {
-
- KEY_GPIO_Init();
- //TIM2_GPIO_Config();
- //GPIOB->ODR|=0xFFFFFFFF;//ODR必须清零
- while(1)
- {
- if(KEY_Scan(KEY1_GPIO_Port,KEY1_GPIO_Pin )==KEY_ON)
- {
- QJTIM2_PWM50_Init();
- QJTIM3_PWM50_Init();
- macTIM_APBxClock_FUN2 (macTIM_CLK2, ENABLE);
- macTIM_APBxClock_FUN (macTIM_CLK, ENABLE);
- }
- if(KEY_Scan(KEY2_GPIO_Port,KEY2_GPIO_Pin )==KEY_ON)
- {
- QJTIM2_PWM100_Init();
- QJTIM3_PWM100_Init();
- macTIM_APBxClock_FUN2 (macTIM_CLK2, ENABLE);
- macTIM_APBxClock_FUN (macTIM_CLK, ENABLE);
- }
- }
- }
- [/align][/align][/align][/font][/align][align=left][font=宋体]
复制代码 L298N接12V电池,按下复位键,用万用表测得OUT1与OUT2的电压为负的12V |