How to generate PWM using STM32 Nucleo L433RC?

[SJose.11]

I have followed the ST tutorial on how to genterate a 1Hz PWM using timer, but for some reason its not blinking.

I configured:

1)Clock configuration to 8Mhz

2)Set PWM genration channel 3

3)Set prescaler to 127

4)Set ARR to 62499

5)Selected PWM mode 1 and made the pulse value to 31250

6)Finally I set the PINB10 to tim2_ch3 and connected it to an LED in a breadboard

In the main.c I have this HAL function to start the PWM

 HAL_TIM_PWM_Start(&htim2,HAL_TIM_ACTIVE_CHANNEL_3 );

Please help ,I have been with this for some time now. But still I am not getting the output.

[waclawek.jan]

In CCMR2, you have set CH3 for output compare, but in CCER you have set the enable bit for CH2.

JW

[SJose.11]

Thanks for your help.The issue was a bug in HAL function :

HAL_TIM_PWM_Start(&htim2,HAL_TIM_ACTIVE_CHANNEL_4 )

When I gave HAL_TIM_ACTIVE_CHANNEL_4 its taken as channel 3 and giving the correct output.

[waclawek.jan]

I don't use Cube/CubeMX, but it appears that you are supposed to use TIM_CHANNEL_3 as a parameter there https://github.com/STMicroelectronics/STM32CubeL4/blob/5e1553e07706491bd11f4edd304e093b6e4b83a4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_tim.c#L1420

JW

[SJose.11]

I used TIM_CHANNEL_3  , then Channel 2 was enabling. Then I changed to TIM_CHANNEL_4.

[waclawek.jan]

> I used TIM_CHANNEL_3 , then Channel 2 was enabling. Then I changed to TIM_CHANNEL_4.

No. You were using HAL_TIM_ACTIVE_CHANNEL_3 and then you've change it to HAL_TIM_ACTIVE_CHANNEL_4 . Those are different constants than TIM_CHANNEL_3 and TIM_CHANNEL_4.

JW

[SJose.11]

You are right. When I use TIM_CHANNEL_3 its working.

Thanks for your help.