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| author | Louis Burda <quent.burda@gmail.com> | 2022-12-02 16:06:32 +0100 |
|---|---|---|
| committer | Louis Burda <quent.burda@gmail.com> | 2022-12-02 17:18:16 +0100 |
| commit | 0392766bc379448c907de2bce45d6b57621d95b5 (patch) | |
| tree | b87705bfb60a6569769b3c0125a910144c784436 /src/uart_rx.pio | |
| parent | 6defee37f9939991bbf3152e2cd4e18593baa541 (diff) | |
| download | sxkbd-0392766bc379448c907de2bce45d6b57621d95b5.tar.gz sxkbd-0392766bc379448c907de2bce45d6b57621d95b5.zip | |
Added split uart support based on chibios impl
Diffstat (limited to 'src/uart_rx.pio')
| -rw-r--r-- | src/uart_rx.pio | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/uart_rx.pio b/src/uart_rx.pio new file mode 100644 index 0000000..a903176 --- /dev/null +++ b/src/uart_rx.pio @@ -0,0 +1,22 @@ +.program uart_rx + +.wrap_target +start: + wait 0 pin, 0 [6] ; wait for START bit + + set x, 7 [4] ; read 8 DATA bits and offset + ; clock for better readings +bitloop: + in pins, 1 + jmp x--, bitloop [6] + + jmp pin, outb ; got STOP bit, output byte + +error: + irq wait 0 ; no STOP bit, + wait 1 pin, 0 ; set err IRQ and await reset + jmp start + +outb: + push block +.wrap |