Nucleo-G474RE: No PWM is shown generated on TIM_Complementary_Signals example

[ANARA.1]

Using Nucleo-G474RE. Am trying the TIM_Complementary_Signals example. This uses TIM1. No PWM is shown generated on any of the 6 channels. Tried setting MOE bit in TIM1->BDTR as also CC1E, CC1NE,...CC3E, CC3NE in TIM1->CCER before the PWM_Start calls. No luck.

[Imen.D · Accepted solution]

Hello @ANARA.1​ ,

Make sure that the NUCLEO-G474RE is properly configured as descibed in the readme.txt file:

• Connect the TIM1 pins to an oscilloscope to monitor the different waveforms:
  • TIM1_CH1 pin (PA8)  
  • TIM1_CH1N pin (PB13)  
  • TIM1_CH2 pin (PA9)  
  • TIM1_CH2N pin (PA12)  
  • TIM1_CH3 pin (PA10)  
  • TIM1_CH3N pin (PB15)
• Connect the TIM1 break pin TIM1_BKIN pin (PB12) to the GND. To generate a break event, switch this pin level from 0V to 3.3V.  

Hope this helps you.

Imen

[waclawek.jan]

Read out and check/post content of TIM and relevant GPIO registers.

JW

[ANARA.1]

Thanks! Was missing the TIM1_BKIN pin (PB12) to GND connection. Connected Pin 16 (PB12) to Pin 20 (GND) on CN10. Now I get CH1, CH1N, CH2N and CH3N. Still dont get CH2 and CH3. Am using my USB Logic Analyzer for monitoring. Logic Analyzer GND is connected to PIN 9 (GND) on CN10.