raspi/linux
1
0
Fork 1
mirror of https://github.com/raspberrypi/linux.git synced 2025-12-06 01:49:46 +00:00
Code Issues Projects Releases Wiki Activity

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

Browse Source 
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
parent 776d6652f7
commit d98b3e2227
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/pwm/pwm-pio-rp1.c
View File

@@ -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 */
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_out(pio_isr, 32));
}