- #include "pwm.h"
- #include "led.h"
- //PWM输出初始化
- //arr：自动重装值
- //psc：时钟预分频数
- void TIM1_PWM_Init(u16 arr,u16 psc)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- TIM_OCInitTypeDef TIM_OCInitStructure;
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);//
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE); //使能GPIO外设时钟使能
-
- //设置该引脚为复用输出功能,输出TIM1 CH1的PWM脉冲波形
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //TIM_CH1
- 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_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值 80K
- TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值 不分频
- TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
- TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
-
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
- TIM_OCInitStructure.TIM_Pulse = 0; //设置待装入捕获比较寄存器的脉冲值
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
- TIM_OC1Init(TIM1, &TIM_OCInitStructure); //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
- TIM_CtrlPWMOutputs(TIM1,ENABLE); //MOE 主输出使能
- TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); //CH1预装载使能
-
- TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器
- }
- void TIM1_PWM_Init_ch3(u16 arr,u16 psc)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- TIM_OCInitTypeDef TIM_OCInitStructure;
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);//
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE); //使能GPIO外设时钟使能
-
- //设置该引脚为复用输出功能,输出TIM1 CH1的PWM脉冲波形
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //TIM_CH1
- 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_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值 80K
- TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值 不分频
- TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
- TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
-
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
- TIM_OCInitStructure.TIM_Pulse = 0; //设置待装入捕获比较寄存器的脉冲值
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
- TIM_OC3Init(TIM1, &TIM_OCInitStructure); //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
- TIM_CtrlPWMOutputs(TIM1,ENABLE); //MOE 主输出使能
- TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable); //CH1预装载使能
- TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器
- TIM_Cmd(TIM1, ENABLE); //使能TIM1
- }<div class="blockcode"><blockquote>#include "delay.h"
- #include "sys.h"
- #include "led.h"
- #include "lcd_init.h"
- #include "lcd.h"
- #include "pwm.h"
- #include "motor_c.h"
- u32 t=0,t1;
- u8 table[2];
- int main(void)
- {
- delay_init();
- LED_Init();//LED初始化
- LCD_Init();//LCD初始化
- LCD_Fill(0,0,LCD_W,LCD_H,WHITE);
- LCD_ShowString(0,0, "PWM SEND",BLUE,WHITE,16,0);
- //LCD_ShowChinese(0,30,"作者：XXX",MAGENTA,WHITE,16,0);
- LCD_ShowString(0,30,"PWM: %", MAGENTA,WHITE,16,0);
- TIM1_PWM_Init(719,0); //不分频。PWM频率=72000/(3599+1)=20Khz
- TIM1_PWM_Init_ch3(719,0);
- LED=0;
- while(1)
- {
- t++;
- t1=t1+2;
- if(t1==720){t=t1=0;}
-
- TIM_SetCompare1(TIM1,t);
- TIM_SetCompare3(TIM1,t1);
-
- LCD_ShowIntNum(39,30,(u8)(t1*100/719),3,RED,WHITE,16);//显示pwm占空比
-
- LCD_DrawLine(0,90,0,120,RED);
-
- LCD_DrawLine(0,90,100,90,WHITE);
- LCD_DrawLine(0,90,(u8)(t1*100/719),90,RED);
-
- LCD_DrawLine(table[0],90,table[0],120,WHITE);
- LCD_DrawLine((u8)(t1*100/719),90,(u8)(t1*100/719),120,RED);
-
- LCD_DrawLine(0,120,100,120,WHITE);
- LCD_DrawLine((u8)(t1*100/719),120,100,120,RED);
- LCD_DrawLine(100,90,100,120,RED);
- table[0]=(u8)(t1*100/719);
-
- delay_ms(10);
-
- }
- }
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