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drivers: serial: Pico PIO UART wait for initial high

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Adjust the PIO assemble for the UART RX to wait for the line
to initially be high before starting the wrap loop and wait
for a low start bit.

Signed-off-by: Peter Johanson <peter@peterjohanson.com>
This commit is contained in:
Peter Johanson 2025-01-20 10:55:11 -07:00 committed by Benjamin Cabé
parent 43fe16682f
commit 484fb29f5f
1 changed files with 8 additions and 8 deletions
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16
drivers/serial/uart_rpi_pico_pio.c
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@ -39,15 +39,15 @@ RPI_PICO_PIO_DEFINE_PROGRAM(uart_tx, 0, 3,
/* .wrap */
);
RPI_PICO_PIO_DEFINE_PROGRAM(uart_rx, 0, 8,
RPI_PICO_PIO_DEFINE_PROGRAM(uart_rx, 1, 8,
0x20a0, /* 0: wait 1 pin, 0 */
/* .wrap_target */
0x2020, /* 0: wait 0 pin, 0 */
0xea27, /* 1: set x, 7 [10] */
0x4001, /* 2: in pins, 1 */
0x0642, /* 3: jmp x--, 2 [6] */
0x00c8, /* 4: jmp pin, 8 */
0xc014, /* 5: irq nowait 4 rel */
0x20a0, /* 6: wait 1 pin, 0 */
0x2020, /* 1: wait 0 pin, 0 */
0xea27, /* 2: set x, 7 [10] */
0x4001, /* 3: in pins, 1 */
0x0643, /* 4: jmp x--, 3 [6] */
0x00c8, /* 5: jmp pin, 8 */
0xc014, /* 6: irq nowait 4 rel */
0x0000, /* 7: jmp 0 */
0x8020, /* 8: push block */
/* .wrap */