假设我用PWM控制灯的强弱，怎么同时把数字从串口发到电脑上

getgogo123 · 发表于 2019-5-18 08:53:15

u16 len;
u16 led0pwmval=100;
u8 rdata[200];
TIM_HandleTypeDef TIM3_Handler;
TIM_OC_InitTypeDef TIM3_CH4Handler;
void TIM3_PWM_Init(u16 arr,u16 psc)
{
TIM3_Handler.Instance=TIM3;
TIM3_Handler.Init.Prescaler=psc;
TIM3_Handler.Init.CounterMode=TIM_COUNTERMODE_UP;
TIM3_Handler.Init.Period=arr;
TIM3_Handler.Init.ClockDivision=TIM_CLOCKDIVISION_DIV1;
HAL_TIM_PWM_Init(&TIM3_Handler);

TIM3_CH4Handler.OCMode=TIM_OCMODE_PWM1;
TIM3_CH4Handler.Pulse=arr/2;

TIM3_CH4Handler.OCPolarity=TIM_OCPOLARITY_LOW;
HAL_TIM_PWM_ConfigChannel(&TIM3_Handler,&TIM3_CH4Handler,TIM_CHANNEL_4);
HAL_TIM_PWM_Start(&TIM3_Handler,TIM_CHANNEL_4);
}

void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)
{
GPIO_InitTypeDef GPIO_Initure;
__HAL_RCC_TIM3_CLK_ENABLE(); //使能定时器3
__HAL_RCC_GPIOB_CLK_ENABLE(); //开启GPIOB时钟

GPIO_Initure.Pin=GPIO_PIN_1;          //PB1
GPIO_Initure.Mode=GPIO_MODE_AF_PP; //复用推完输出
GPIO_Initure.Pull=GPIO_PULLUP;       //上拉
GPIO_Initure.Speed=GPIO_SPEED_HIGH;    //高速
GPIO_Initure.Alternate=GPIO_AF2_TIM3; //PB1复用为TIM3_CH4
HAL_GPIO_Init(GPIOB,&GPIO_Initure);
}
//设置TIM通道4的占空比
//compare:比较值
void TIM_SetTIM3Compare4(u32 compare)
{
TIM3->CCR4=compare;
}
int main(void)
{

u8 key;

Cache_Enable();                //打开L1-Cache
HAL_Init();          //初始化HAL库
Stm32_Clock_Init(432,25,2,9); //设置时钟,216Mhz
delay_init(216);             //延时初始化
uart_init(115200);       //串口初始化
LED_Init();                   //初始化LED
KEY_Init();                   //按键初始化
TIM3_PWM_Init(500-1,108-1);    //108M/108=1M的计数频率，自动重装载为500，那么PWM频率为1M/500=2kHZ

   while(1)
{


   key=KEY_Scan(0);


TIM_SetTIM3Compare4(led0pwmval);

  HAL_UART_Transmit(&UART1_Handler,rdata,sizeof(rdata),1000);





}
}

getgogo123 · 发表于 2019-5-18 08:54:41

u8 KEY_Scan(u8 mode)
{
static u8 key_up=1;    //按键松开标志
if(mode==1)key_up=1; //支持连按
if(key_up&&(KEY0==0||KEY1==0||KEY2==0||WK_UP==1))
{
      delay_ms(10);
      key_up=0;
      if(KEY0==0)    return KEY0_PRES;
      else if(KEY1==0)
{ led0pwmval=led0pwmval-50;
return KEY1_PRES;
}
      else if(KEY2==0)  return KEY2_PRES;
      else if(WK_UP==1)
{ led0pwmval=led0pwmval+50;
return WKUP_PRES;
}
}else if(KEY0==1&&KEY1==1&&KEY2==1&&WK_UP==0)key_up=1;
return 0; //无按键按下
}
这个是改的key.c里的
我想把led0pwmval 按一次减少或增加后的数值发到电脑上