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samples: fade_led: use all available LEDs

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Refactored the sample code to use all available PWM LEDs

Signed-off-by: Yishai Jaffe <yishai1999@gmail.com>
This commit is contained in:
Yishai Jaffe 2024-10-28 09:37:14 +02:00 committed by Benjamin Cabé
parent 02b2d5563c
commit a5fd92b0ab
1 changed files with 36 additions and 25 deletions
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61
samples/basic/fade_led/src/main.c
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@ -14,46 +14,57 @@
#include <zephyr/device.h>
#include <zephyr/drivers/pwm.h>
static const struct pwm_dt_spec pwm_led0 = PWM_DT_SPEC_GET(DT_ALIAS(pwm_led0));
#define PWM_LED_ALIAS(i) DT_ALIAS(_CONCAT(pwm_led, i))
#define PWM_LED(i, _) \
IF_ENABLED(DT_NODE_EXISTS(PWM_LED_ALIAS(i)), (PWM_DT_SPEC_GET(PWM_LED_ALIAS(i)),))
#define MAX_LEDS 10
static const struct pwm_dt_spec pwm_leds[] = {LISTIFY(MAX_LEDS, PWM_LED, ())};
#define NUM_STEPS 50U
#define SLEEP_MSEC 25U
int main(void)
{
uint32_t pulse_width = 0U;
uint32_t step = pwm_led0.period / NUM_STEPS;
uint32_t pulse_widths[ARRAY_SIZE(pwm_leds)];
uint32_t steps[ARRAY_SIZE(pwm_leds)];
uint8_t dir = 1U;
int ret;
printk("PWM-based LED fade\n");
printk("PWM-based LED fade. Found %d LEDs\n", ARRAY_SIZE(pwm_leds));
if (!pwm_is_ready_dt(&pwm_led0)) {
printk("Error: PWM device %s is not ready\n",
pwm_led0.dev->name);
return 0;
for (size_t i = 0; i < ARRAY_SIZE(pwm_leds); i++) {
pulse_widths[i] = 0;
steps[i] = pwm_leds[i].period / NUM_STEPS;
if (!pwm_is_ready_dt(&pwm_leds[i])) {
printk("Error: PWM device %s is not ready\n", pwm_leds[i].dev->name);
return 0;
}
}
while (1) {
ret = pwm_set_pulse_dt(&pwm_led0, pulse_width);
if (ret) {
printk("Error %d: failed to set pulse width\n", ret);
return 0;
}
printk("Using pulse width %d%%\n", 100 * pulse_width / pwm_led0.period);
if (dir) {
pulse_width += step;
if (pulse_width >= pwm_led0.period) {
pulse_width = pwm_led0.period - step;
dir = 0U;
for (size_t i = 0; i < ARRAY_SIZE(pwm_leds); i++) {
ret = pwm_set_pulse_dt(&pwm_leds[i], pulse_widths[i]);
if (ret) {
printk("Error %d: failed to set pulse width for LED %d\n", ret, i);
}
} else {
if (pulse_width >= step) {
pulse_width -= step;
printk("LED %d: Using pulse width %d%%\n", i,
100 * pulse_widths[i] / pwm_leds[i].period);
if (dir) {
if (pulse_widths[i] + steps[i] >= pwm_leds[i].period) {
pulse_widths[i] = pwm_leds[i].period;
dir = 0U;
} else {
pulse_widths[i] += steps[i];
}
} else {
pulse_width = step;
dir = 1U;
if (pulse_widths[i] <= steps[i]) {
pulse_widths[i] = 0;
dir = 1U;
} else {
pulse_widths[i] -= steps[i];
}
}
}