title: stm32 generate PWM signal with multiple channels
body: <pre><code>HAL_TIM_PWM_Start(&amp;htim3, TIM_CHANNEL_1);
  HAL_TIM_PWM_Start(&amp;htim3, TIM_CHANNEL_2);
  TIM3-&gt;CCR1 =25000;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/qcHiw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qcHiw.png" alt="enter image description here"></a> </p>
  
  <p>I'm trying to set 2 pins to the same PWM signal at the same time.
  However, it doesn't work. Only 1 pin (channel 1) has PWM output and the 2nd pin (channe 2) has empty output.</p>