I’m hoping somebody can help me understand something about DMA ports. I’m playing with some LEDs on a Matek H743-Wlite.
I have LEDs working from a script the LED pin, PWM13. No problem
I move the LEDs to PWM12 and I get an error “No DMA on 11 and 12” (or something like that). No LEDs.
I move the LEDs to PWM10 and they work from the script again. Good.
The HWDEF says:
# Motors
PB0 TIM3_CH3 TIM3 PWM(1) GPIO(50) BIDIR
PB1 TIM3_CH4 TIM3 PWM(2) GPIO(51)
PA0 TIM2_CH1 TIM2 PWM(3) GPIO(52) BIDIR
PA1 TIM2_CH2 TIM2 PWM(4) GPIO(53)
PA2 TIM5_CH3 TIM5 PWM(5) GPIO(54) BIDIR
PA3 TIM5_CH4 TIM5 PWM(6) GPIO(55)
PD12 TIM4_CH1 TIM4 PWM(7) GPIO(56) BIDIR
PD13 TIM4_CH2 TIM4 PWM(8) GPIO(57)
# Disable DMA on PWM9-12 so that the LEDs get a channel
PD14 TIM4_CH3 TIM4 PWM(9) GPIO(58) NODMA
PD15 TIM4_CH4 TIM4 PWM(10) GPIO(59) NODMA
PE5 TIM15_CH1 TIM15 PWM(11) GPIO(60) NODMA
PE6 TIM15_CH2 TIM15 PWM(12) GPIO(61) NODMA
DMA_PRIORITY SPI1* SPI4*
DMA_NOSHARE SPI1* SPI4* TIM3* TIM2* TIM5* TIM4*
My question is: If I was to read the HWDEF I would assume that my LED script shouldn’t work on PWM10, but it does. Am I missing something or is there more to it?