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pwm: rp1: Correct period off-by-1 error

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Correct the set_period method to pass (period - 1), as required by the
PIO state machine.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
This commit is contained in:
Phil Elwell
2025-11-11 15:50:34 +00:00
committed by Dom Cobley
parent 5dde6e33f1
commit 7fafd59712
1 changed files with 1 additions and 1 deletions
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drivers/pwm/pwm-pio-rp1.c
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@@ -83,7 +83,7 @@ static inline void pwm_program_init(PIO pio, uint sm, uint offset, uint pin)
/* Write `period` to the input shift register - must be disabled */ /* Write `period` to the input shift register - must be disabled */
static void pio_pwm_set_period(PIO pio, uint sm, uint32_t period) static void pio_pwm_set_period(PIO pio, uint sm, uint32_t period)
{ {
pio_sm_put_blocking(pio, sm, period); pio_sm_put_blocking(pio, sm, period - 1);
pio_sm_exec(pio, sm, pio_encode_pull(false, false)); pio_sm_exec(pio, sm, pio_encode_pull(false, false));
pio_sm_exec(pio, sm, pio_encode_out(pio_isr, 32)); pio_sm_exec(pio, sm, pio_encode_out(pio_isr, 32));
} }