PWM Generation with TIM and DMA

[falOn-Dev]

Is there any way with this HAL to create PWM signals using DMA, I'm trying to implement DShot and I've found a few issues on this repo with conflicting info, it seems like there wasn't a way, and then there was, and then when things got refactored at some point there stopped being a way to do it again?

[burrbull]

What do you want to control with DMA? Period or duty?

[falOn-Dev]

Duty, like feeding a buffer of 16 duty cycles into it that it ouputs sequentially

[burrbull]

@falOn-Dev Try https://github.com/stm32-rs/stm32f4xx-hal/tree/pwm-dma branch.
Theoretically with last commit it should be possible to add here

stm32f4xx-hal/examples/pwm.rs

Lines 23 to 25 in 3617dd7

	let max_duty = ch1.get_max_duty();
	ch1.set_duty(max_duty / 2);
	ch1.enable();

something like

stm32f4xx-hal/examples/spi-dma.rs

Lines 69 to 81 in 2cdf58e

	let mut transfer = Transfer::init_memory_to_peripheral(
	stream,
	tx,
	buffer,
	None,
	config::DmaConfig::default()
	.memory_increment(true)
	.fifo_enable(true)
	.fifo_error_interrupt(true)
	.transfer_complete_interrupt(true),
	);
	transfer.start(|_tx| {});

passing ch1 instead of tx.

[burrbull]

Although there are should also be added something like enable_dma and listen for PwmChannel.

[falOn-Dev]

I might be doing something deeply wrong, but with this code, it gives me output saying that PWMChannel doesn't implement DMASet, I attached the output of a cargo check below
check.log

[burrbull]

I'll look this tomorrow.

[burrbull]

Sorry. I can't read the "gist"s.

About the error: There should be one of Stream1<DMA2>, Stream3<DMA2> or Stream6<DMA2>. See RM->DMA functional description->Channel selection section