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Having problems with STM32F7 TIM1 PWM Mode 1 Output pins

Question asked by David Harrison on Mar 10, 2018
Latest reply on Mar 10, 2018 by David Harrison

Hi all. I am using an STM32F767VGT6 in a custom board. I am trying to use TIM1 to generate four independent PWM output pulses on each of its CH1 - CH4 output pins.


I have successfully implemented this elsewhere in my system using one channel only, CH1, on TIM10. My TIM1 Timer init code is almost identical, yet I cannot get the PWM pulses to appear on the PB9, PB11, PB13 and PB14 pins.

 

If I switch on the TIM1 Update and CC interrupts and poke the pins in the interrupt handlers, I can get the correct waveforms, but I shouldn't have to do that, the TIM1 peripheral should change the pins by itself with no interrupts needed.


So I know the pins, when set as regular GPIO pins, and also the board, all work. The problem is that when I set those pins to be GPIO_AF1_TIM1 and switch off the interrupts which are not needed for any other purpose, I don't get any PWM waveform on any of those CH1 - CH4 pins.

 

Apart from the fact that TIM1 is an advanced timer with lots of bells and whistles which I don't need, and TIM10 is a regular simpler timer, I can't figure out what I am missing in my TIM1 init code to make it work just like my TIM10 does elsewhere.

 

I have attached my TIM1 Init code here. Can anyone see what is wrong? Thanks.

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