#15: Fan control working, wip

firmware/main/fan.cpp

@@ -3,30 +3,49 @@
 
 #include "driver/ledc.h"
 
-void Fan::init()
+void Fan::init(int gpioNum, uint32_t freqHz, uint32_t duty)
 {
-    ledc_timer_config_t fan_timer = {
-        .speed_mode = LEDC_LOW_SPEED_MODE,
-        .duty_resolution = LEDC_TIMER_12_BIT,
-        .timer_num = LEDC_TIMER_0,
-        .freq_hz = 100,
-        .clk_cfg = LEDC_AUTO_CLK};
+    ledc_timer_config_t fan_timer = {};
+    fan_timer.speed_mode = LEDC_LOW_SPEED_MODE;
+    fan_timer.duty_resolution = LEDC_TIMER_12_BIT;
+    fan_timer.timer_num = LEDC_TIMER_0;
+    fan_timer.freq_hz = freqHz;
+    fan_timer.clk_cfg = LEDC_USE_APB_CLK;
     ESP_ERROR_CHECK(ledc_timer_config(&fan_timer));
 
-    ledc_channel_config_t fan_channel = {
-        .gpio_num = 16,
-        .speed_mode = LEDC_LOW_SPEED_MODE,
-        .channel = LEDC_CHANNEL_0,
-        .intr_type = LEDC_INTR_DISABLE,
-        .timer_sel = LEDC_TIMER_0,
-        .duty = 0, // Set duty to 0%
-        .hpoint = 0};
+    ledc_channel_config_t fan_channel = {};
+    fan_channel.gpio_num = gpioNum;
+    fan_channel.speed_mode = LEDC_LOW_SPEED_MODE;
+    fan_channel.channel = LEDC_CHANNEL_0;
+    fan_channel.intr_type = LEDC_INTR_DISABLE;
+    fan_channel.timer_sel = LEDC_TIMER_0;
+    fan_channel.duty = duty;
+
     ESP_ERROR_CHECK(ledc_channel_config(&fan_channel));
 }
 
-void Fan::setSpeed(unsigned int val)
+void Fan::setGoIntensity(unsigned int goIntensity)
+{
+    m_accumGo = goIntensity;
+    setSpeed();
+}
+
+void Fan::setStopIntensity(unsigned int stopIntensity)
+{
+    m_accumStop = stopIntensity;
+    setSpeed();
+}
+
+void Fan::setSpeed()
 {
-    unsigned int duty = val / 100 * (1 << 12);
+    // Normalized intensity, 121 pixels in total, 8-bit per pixel
+    float totalIntensity = (m_accumGo + m_accumStop) * 0.001080f;
+    int fanIntensity = static_cast<int>(totalIntensity);
+    if (fanIntensity >= 98) fanIntensity = 100; // might as well..
+
+    unsigned int duty = fanIntensity / 100.0 * (1 << 12);
     ESP_ERROR_CHECK(ledc_set_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0, duty));
     ESP_ERROR_CHECK(ledc_update_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0));
-}
+}
+
+Fan fanControl;

firmware/main/fan.h

@@ -1,12 +1,37 @@
 
 #pragma once
 
+#include "hal/ledc_types.h"
+
 class Fan
 {
 public:
-    static void init();
     /**
-     * Set the speed (duty cycle) between 0 - 100
+     * Initializes the fan controller to default values:
+     *  - GPIO: 16
+     *  - CLK: 10 kHz
+     *  - Duty: 0
+     */
+    void init(int gpioNum = 16, uint32_t freqHz = 10000, uint32_t duty = 0);
+
+    /**
+     * Go intensity between 0 - 46665 (61 pixels)
+     */
+    void setGoIntensity(unsigned int goIntensity);
+
+    /**
+     * Stop intensity between 0 - 45900 (60 pixels)
+     */
+    void setStopIntensity(unsigned int stopIntensity);
+
+private:
+    unsigned int m_accumGo;
+    unsigned int m_accumStop;
+
+    /**
+     * Sets the speed based on sign intensities (duty: 0-100)
      */
-    static void setSpeed(unsigned int val);
-};
+    void setSpeed();
+};
+
+extern Fan fanControl;

firmware/main/main.cpp

@@ -21,6 +21,8 @@
 #include "spi.h"
 #include "fan.h"
 
+#include "driver/ledc.h"
+
 #define STATIC 0
 #define SHIFTING 1
 #define SWEEP 2
@@ -127,6 +129,9 @@ void app_main()
 	ESP_ERROR_CHECK(esp_netif_init());
 	ESP_ERROR_CHECK(esp_event_loop_create_default());
 
+	fanControl.init();
+	fanControl.setGoIntensity(10000);
+
 	/**
 	 * Register two events and bind the callbacks to the WiFi object.
 	 * We want to know when we have an IP, and when we disconnet from the WiFi.
@@ -149,8 +154,6 @@ void app_main()
 		.addHandler(&g_echo)
 		.addHandler(&g_about);
 
-	Fan::init();
-
 	// initialize SPI for stop and go sign
 	traffic_spi_init(HSPI_HOST, SPI_DMA_CH1, &spi_handle_stop, &trans_desc_stop, stop_data,
 					 STOP_LED_DATA_PIN, STOP_LED_CLK_PIN, STOP_LED_NUMBER);

firmware/main/trafficlight.cpp

@@ -40,14 +40,17 @@ void TrafficLight::setStopColor(const Color &stop)
 	stop_data[(STOP_LED_NUMBER + 1) * 4 + 2] = 0xff;
 	stop_data[(STOP_LED_NUMBER + 1) * 4 + 3] = 0xff;
 
+	unsigned int accumIntensity = 0;
+
 	for (uint8_t led = 1; led <= STOP_LED_NUMBER; led++)
 	{
+		accumIntensity += m_stopColor.r() + m_stopColor.g() + m_goColor.b();
 		Color::colorToLed(stop_data, led, m_stopColor.r(), m_stopColor.g(), m_stopColor.b()); // rgb
 	}
 
 	ESP_ERROR_CHECK(spi_device_queue_trans(spi_handle_stop, &trans_desc_stop, portMAX_DELAY));
 
-	Fan::setSpeed(m_stopColor.r() / 255 * 100);
+	// include fan.h
 }
 
 void TrafficLight::setGoColor(const Color &go)
@@ -73,5 +76,5 @@ void TrafficLight::setGoColor(const Color &go)
 
 	ESP_ERROR_CHECK(spi_device_queue_trans(spi_handle_go, &trans_desc_go, portMAX_DELAY));
 
-	Fan::setSpeed(m_goColor.r() / 255 * 100);
+	// include fan.h
 }