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???????PWM??????????????????????????????????????????????????????????????????????????????????T?????????0????Vmax?????D??????(D/2) * Vmax?????D??25%?50%?75%???????????12.5%?50%?75%?Vmax?

???????????????????????????????????????????????????????LED????PWM???????????

PWM??????

PWM??????????????????????????????????????????ON?OFF??????STM32????????PWM?????????????????????????????

????MATLAB?Simulink????????????PWM???

?????????????????PWM????50%????PWM?????????

PWM???

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????STM32???????PWM???????????????????????????PWM??????????????????????

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??????????MCU??STM32?????PWM????????????????????PWM??????????NUCLEO-F767ZI?PWM?????

int main(void) {      HAL_Init();      MX_GPIO_Init();      MX_TIM4_Init();      MX_TIM3_Init();      MX_TIM12_Init();      int32_t time_stamp = 0;      int32_t time_stamp_old = 0;      int32_t ccr_val = 0;      uint8_t add_flag = 1;      HAL_TIM_PWM_Start(&htim4, TIM_CHANNEL_2);      HAL_TIM_PWM_Start(&htim12, TIM_CHANNEL_1);      HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_3);      while(1) {          time_stamp = HAL_GetTick();          if(time_stamp - time_stamp_old > 5) {              time_stamp_old = time_stamp;              if(add_flag) {                  ccr_val += 25;                  if(ccr_val >= 0xFFFF) {                      ccr_val = 0xFFFF;                      add_flag = 0;                  }              } else {                  ccr_val -= 25;                  if(ccr_val <= 0) {                      add_flag = 1;                      ccr_val = 0;                  }              }              TIM4->CCR2 = ccr_val;              TIM12->CCR1 = ccr_val;              TIM3->CCR3 = ccr_val;          }      }  }

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???????PWM????????????????????????????????????????????????????????????PWM????????LED????????????????????????????????????PWM???

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