96 lines
1.5 KiB
C
96 lines
1.5 KiB
C
#include "sys.h"
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#include "usart.h"
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#include "delay.h"
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#include "led.h"
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#include "key.h"
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#include "timer.h"
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/************************************************************************************/
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//PWM输出实验
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//STM32H7工程模板-HAL库函数版本
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//DevEBox 大越创新
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//淘宝店铺：mcudev.taobao.com
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//淘宝店铺：shop389957290.taobao.com
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/************************************************************************************/
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u8 dir=1;
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u16 led0pwmval=0;
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int main(void)
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{
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Cache_Enable(); //打开L1-Cache
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HAL_Init(); //初始化HAL库
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Stm32_Clock_Init(160,5,2,4); //设置时钟,400Mhz
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delay_init(400); //延时初始化
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uart_init(115200); //串口初始化
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LED_Init(); //初始化LED时钟
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KEY_Init();
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TIM3_PWM_Init(500-1,200-1); //200M/200=1M的计数频率，自动重装载为500，那么PWM频率为1M/500=2kHZ
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while(1)
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{
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delay_ms(10);
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if(dir)led0pwmval++; //dir==1 led0pwmval递增
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else led0pwmval--; //dir==0 led0pwmval递减
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if(led0pwmval>300)dir=0; //led0pwmval到达300后，方向为递减
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if(led0pwmval==0)dir=1; //led0pwmval递减到0后，方向改为递增
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TIM_SetTIM3Compare4(led0pwmval); //修改比较值，修改占空比
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}
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}
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/************************************************************************************/
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//STM32H7工程模板-HAL库函数版本
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//DevEBox 大越创新
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//淘宝店铺：mcudev.taobao.com
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//淘宝店铺：shop389957290.taobao.com
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/************************************************************************************/
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