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stm32: Fix off-by-one error in the prescaler calculation in hard_pwm.c

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2025-12-31 18:39:23 -05:00
parent 74a15f4834
commit e60fe3d99b
1 changed files with 2 additions and 2 deletions
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4
src/stm32/hard_pwm.c
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@@ -11,7 +11,7 @@
#include "internal.h" // GPIO
#include "sched.h" // sched_shutdown
#define MAX_PWM (256 + 1)
#define MAX_PWM 256
DECL_CONSTANT("PWM_MAX", MAX_PWM);
struct gpio_pwm_info {
@@ -327,7 +327,7 @@ gpio_timer_setup(uint8_t pin, uint32_t cycle_time, uint32_t val,
// In normal mode, allow the pulse frequency (cycle_time) to change
// in order to maintain the requested duty ratio (val/MAX_PWM).
hwpwm_ticks = MAX_PWM;
prescaler = pcycle_time / (hwpwm_ticks - 1);
prescaler = pcycle_time / MAX_PWM;
if (prescaler > UINT16_MAX + 1)
prescaler = UINT16_MAX + 1;
else if (prescaler < 1)