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stm32: Change hard_pwm.c MAX_PWM to 257

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Choose a value for MAX_PWM that avoids an expensive run-time division.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2025-04-07 11:56:52 -04:00
parent 7a9b06ad86
commit 3656006a30
2 changed files with 4 additions and 3 deletions
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2
src/stm32/gpio.h
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@ -24,7 +24,7 @@ uint8_t gpio_in_read(struct gpio_in g);
struct gpio_pwm { struct gpio_pwm {
void *reg; void *reg;
}; };
struct gpio_pwm gpio_pwm_setup(uint8_t pin, uint32_t cycle_time, uint8_t val); struct gpio_pwm gpio_pwm_setup(uint8_t pin, uint32_t cycle_time, uint32_t val);
void gpio_pwm_write(struct gpio_pwm g, uint32_t val); void gpio_pwm_write(struct gpio_pwm g, uint32_t val);
struct gpio_adc { struct gpio_adc {

5
src/stm32/hard_pwm.c
View File

@ -11,7 +11,7 @@
#include "internal.h" // GPIO #include "internal.h" // GPIO
#include "sched.h" // sched_shutdown #include "sched.h" // sched_shutdown
#define MAX_PWM 255 #define MAX_PWM (256 + 1)
DECL_CONSTANT("PWM_MAX", MAX_PWM); DECL_CONSTANT("PWM_MAX", MAX_PWM);
struct gpio_pwm_info { struct gpio_pwm_info {
@ -275,7 +275,8 @@ static const struct gpio_pwm_info pwm_regs[] = {
}; };
struct gpio_pwm struct gpio_pwm
gpio_pwm_setup(uint8_t pin, uint32_t cycle_time, uint8_t val){ gpio_pwm_setup(uint8_t pin, uint32_t cycle_time, uint32_t val)
{
// Find pin in pwm_regs table // Find pin in pwm_regs table
const struct gpio_pwm_info* p = pwm_regs; const struct gpio_pwm_info* p = pwm_regs;
for (;; p++) { for (;; p++) {