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LED: PWM limiter (for dimming)

This commit is contained in:
DrZlo13 2021-11-24 07:22:18 +10:00
parent 1c8fbb7f2b
commit 6bb1340641
1 changed files with 15 additions and 6 deletions
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21
main/led.c
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@ -11,6 +11,12 @@
#define TAG "led"
#define LED_PWM_MAX_VAL 256U
#define LED_RED_MAX_VAL 20U
#define LED_GREEN_MAX_VAL 20U
#define LED_BLUE_MAX_VAL 20U
typedef enum {
LedChannelRed,
LedChannelGreen,
@ -33,7 +39,7 @@ void led_init() {
.timer_sel = LEDC_TIMER_0,
.intr_type = LEDC_INTR_DISABLE,
.gpio_num = LED_PIN_RED,
.duty = 256, // Set duty to 100%
.duty = LED_PWM_MAX_VAL, // Set duty to 100%
.hpoint = 0};
ESP_ERROR_CHECK(ledc_channel_config(&ledc_channel_red));
@ -43,7 +49,7 @@ void led_init() {
.timer_sel = LEDC_TIMER_0,
.intr_type = LEDC_INTR_DISABLE,
.gpio_num = LED_PIN_GREEN,
.duty = 256, // Set duty to 100%
.duty = LED_PWM_MAX_VAL, // Set duty to 100%
.hpoint = 0};
ESP_ERROR_CHECK(ledc_channel_config(&ledc_channel_green));
@ -53,7 +59,7 @@ void led_init() {
.timer_sel = LEDC_TIMER_0,
.intr_type = LEDC_INTR_DISABLE,
.gpio_num = LED_PIN_BLUE,
.duty = 256, // Set duty to 100%
.duty = LED_PWM_MAX_VAL, // Set duty to 100%
.hpoint = 0};
ESP_ERROR_CHECK(ledc_channel_config(&ledc_channel_blue));
ESP_LOGI(TAG, "init done");
@ -66,16 +72,19 @@ void led_set(uint8_t red, uint8_t green, uint8_t blue) {
}
void led_set_red(uint8_t value) {
ESP_ERROR_CHECK(ledc_set_duty(LEDC_MODE, LedChannelRed, 256U - value));
uint32_t pwm_value = ((uint32_t)value * LED_RED_MAX_VAL) / 255;
ESP_ERROR_CHECK(ledc_set_duty(LEDC_MODE, LedChannelRed, LED_PWM_MAX_VAL - pwm_value));
ESP_ERROR_CHECK(ledc_update_duty(LEDC_MODE, LedChannelRed));
}
void led_set_green(uint8_t value) {
ESP_ERROR_CHECK(ledc_set_duty(LEDC_MODE, LedChannelGreen, 256U - value));
uint32_t pwm_value = ((uint32_t)value * LED_GREEN_MAX_VAL) / 255;
ESP_ERROR_CHECK(ledc_set_duty(LEDC_MODE, LedChannelGreen, LED_PWM_MAX_VAL - pwm_value));
ESP_ERROR_CHECK(ledc_update_duty(LEDC_MODE, LedChannelGreen));
}
void led_set_blue(uint8_t value) {
ESP_ERROR_CHECK(ledc_set_duty(LEDC_MODE, LedChannelBlue, 256U - value));
uint32_t pwm_value = ((uint32_t)value * LED_BLUE_MAX_VAL) / 255;
ESP_ERROR_CHECK(ledc_set_duty(LEDC_MODE, LedChannelBlue, LED_PWM_MAX_VAL - pwm_value));
ESP_ERROR_CHECK(ledc_update_duty(LEDC_MODE, LedChannelBlue));
}