STM32F103 PWM输出实验
单片机源程序如下:
- #include "led.h"
- #include "delay.h"
- #include "key.h"
- #include "sys.h"
- #include "usart.h"
- #include "timer.h"
-
- int main(void)
- {
- u16 led0pwmva2=0;
- u8 dir=1;
- delay_init(); //延时函数初始化
- NVIC_Configuration(); //设置NVIC中断分组2:2位抢占优先级，2位响应优先级
- uart_init(9600); //串口初始化为9600
- LED_Init(); //LED端口初始化
- KEY_Init();
- //TIM2_PWM_Init(899,0); //不分频。PWM频率=72000/900=8Khz
- TIM2_Int_Init(0,0);
- while(1)
- {
- if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_0) == 0 )
- {
- TIM2_PWM_Init(50000,30000); //不分频。PWM频率=72000/900=8Khz
- //GPIOC->BRR |= 1<<13;
- //delay_ms(10000);
- //GPIOC->BSRR |= 1<<13;
- delay_ms(100);
- TIM_Cmd(TIM2, DISABLE);
- if(dir)led0pwmva2++;
- else led0pwmva2--;
- if(led0pwmva2>30000)dir=0;
- if(led0pwmva2==0)dir=1;
- TIM_SetCompare2(TIM3,led0pwmva2);
- }
- }
- }
所有资料51hei提供下载:
实验9 PWM输出实验.7z
(185.03 KB, 下载次数: 34)
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