Can atmega32a drivers ws2812 by bitbang?

[zzhs-zzz]

Hello, I have made a keybord with atmega32a. It has the rgb underglow, and i connected ws2812s with mcu's io pin directly(just like many atmega32u4).But now i find the ws2812s can not work. So is 32a not supported bitbang driver the ws2812?
Thank you for your answer .

[mtei]

I feel it is clock speed matter. If your atmega32a has enough clock speed, it should work.

qmk_firmware/drivers/avr/ws2812.c

Lines 93 to 101 in 2b66acf

	// The only critical timing parameter is the minimum pulse length of the "0"
	// Warn or throw error if this timing can not be met with current F_CPU settings.
	#define w_lowtime ((w1_nops + w_fixedlow) * 1000000) / (F_CPU / 1000)
	#if w_lowtime > 550
	# error "Light_ws2812: Sorry, the clock speed is too low. Did you set F_CPU correctly?"
	#elif w_lowtime > 450
	# warning "Light_ws2812: The timing is critical and may only work on WS2812B, not on WS2812(S)."
	# warning "Please consider a higher clockspeed, if possible"
	#endif

[yulei]

ps2avr used an attiny to drive ws2812, so you need to buy this from author of ps2avr or write your own driver on attiny to translate i2c commands from atmega32a to ws2812 signal sequence. If your made the keyboard by yourself, why not just using atmega32u4?

[yiancar]

yes they can, they work just fine and I have tried this.
I think this issue can be closed

[zvecr]

From #8598, I had to modify the existing AVR implementation. 32a partially shares the same register config so i cant see how the existing code would work without the same changes.

Edit: raised #8646 or the attiny85 support but its worth trying for this case too.

[yiancar]

is this about entering the bootloader?

[zvecr]

Verified working on https://www.rgbkb.net/products/pan-keyboard-diy-kit by Legonut.