PWM with DMA, 8 bit

[SumanB]

I am using STM32F401CCU. I am trying to generate PWM, using DMA. WHen i select DMA data size as word (16bit) it is working. But when I am trying to do Byte (8 bit) it is not working. Is it because the CCRx register 16 bit wide?

Is there any way I can transfer 8 bit data to 16 bit register? I need this to save lot of RAM space.

Please advise

[gbm]

Yes, this is how it works. No, you can't overcome this. If your task is WS2812 control, then forget the PWM and use SPI. Or change your MCU to F0/G0/L0/L4 and use UART.

[SumanB]

yes, i am doing this for WS2812. How to do it with SPI? It will be great help, if you can share link for WS2812 control with SPI.

Thanks for your help

[S.Ma]

Why not PWM just with timer compare? Some STM32 have channel on compare to update them if dynamic pwm is needed.