LED Control with the X-NUCLEO-LED61A1 Expansion Board

Diff: main.cpp

Revision:

3:ed347127fc38

Parent:

2:dbd596540d46

Child:

4:aeeb361d0227

--- a/main.cpp	Thu Dec 17 18:13:57 2015 +0000
+++ b/main.cpp	Fri Dec 18 16:53:09 2015 +0000
@@ -48,8 +48,17 @@
 
 /* Definitions ---------------------------------------------------------------*/
 
+/* PI. */
+#ifndef M_PI
+    #define M_PI                      3.14159265358979323846f
+#endif
+
 /* Loop period in micro-seconds. */
-#define LOOP_PERIOD_us                1E6
+#define LOOP_PERIOD_us                1E5
+
+/* Sin period in micro-seconds. */
+#define PWM_SIN_PERIOD_us             1E7
+#define ANALOG_SIN_PERIOD_us          1E7
 
 /* Duration of button press in milli-seconds. */
 #define SWITCH_DEMO_BUTTON_PRESS_ms   500
@@ -116,8 +125,8 @@
 {
     "Manual PWM Dimming",
     "Manual Analog Dimming",
-    "Cyclic PWM Dimming",
-    "Cyclic Analog Dimming",
+    "Sinusoidal PWM Dimming",
+    "Sinusoidal Analog Dimming",
     "Photo-based PWM Dimming"
 };
 
@@ -153,11 +162,31 @@
  */
 void LEDHandler(void)
 {
-    /* Switching LED power ON/OFF. */
+    static int tick = 0;
+
+    /* Handling the power switch. */
     if (action == SWITCH_POWER)
+    {
+        /* Switching the LED power ON/OFF. */
         power_on = !power_on;
 
-    /* Handling the LED when powered ON. */
+        if (power_on)
+        {
+            /* Initializing PWM and Analog dimming to maximum values. */
+            pwm_dimming = 1.0f;
+            analog_dimming = 1.0f;
+        }
+        else
+        {
+            /* Printing to the console. */
+            printf("%-56s\r", "Power OFF");
+
+            /* Powering OFF the LED. */
+            led->PowerOFF();
+        }
+    }
+
+    /* Handling the LED dimming when powered ON. */
     if (power_on)
     {
         /* Switching to the next demo. */
@@ -165,10 +194,11 @@
         {
             pwm_dimming = 1.0f;
             analog_dimming = 1.0f;
+            tick = 0;
             demo = (LED_Demo_t) ((demo + 1) % LED_DEMO_SIZE);
         }
 
-        /* Setting the LED depending on the selected demo. */
+        /* Setting the LED dimming depending on the selected demo. */
         switch (demo)
         {
             /* Changing PWM dimming according to the user button. */
@@ -179,7 +209,7 @@
                     pwm_dimming = (pwm_dimming <= 0.0f ? 1.0f : pwm_dimming);
                 }
                 break;
-    
+
             /* Changing Analog dimming according to the user button. */
             case ANALOG_DIMMING_STEPS:
                 if (action == SWITCH_STATE)
@@ -188,68 +218,43 @@
                     analog_dimming = (analog_dimming <= 0.0f ? 1.0f : analog_dimming);
                 }
                 break;
-    
+
             /* Changing PWM dimming continuously. */
             case PWM_DIMMING_VARY:
-                pwm_dimming -= DIMMING_STEP;
-                pwm_dimming = (pwm_dimming <= 0.0f ? 1.0f : pwm_dimming);
-                //wait_ms(50);
+                pwm_dimming = 0.5f * sin(2 * M_PI * (tick++ * LOOP_PERIOD_us) / PWM_SIN_PERIOD_us) + 0.5f;
+                tick %= (int) (PWM_SIN_PERIOD_us / LOOP_PERIOD_us) + 1;
                 action = SWITCH_STATE;
                 break;
-    
+
             /* Changing Analog dimming continuously. */
             case ANALOG_DIMMING_VARY:
-                analog_dimming -= DIMMING_STEP;
-                analog_dimming = (analog_dimming <= 0.0f ? 1.0f : analog_dimming);
-                //wait_ms(500);
+                analog_dimming = 0.5f * sin(2 * M_PI * (tick++ * LOOP_PERIOD_us) / ANALOG_SIN_PERIOD_us) + 0.5f;
+                tick %= (int) (ANALOG_SIN_PERIOD_us / LOOP_PERIOD_us) + 1;
                 action = SWITCH_STATE;
                 break;
-    
+
             /* Setting Analog dimming according to the photo sensor. */
             case ANALOG_DIMMING_PHOTO:
                 //analog_dimming = (uint8_t) (led->GetCurrent() * ADC_RANGE / 72 + 8);
-                analog_dimming = ((1.0f - led->GetCurrent()) * (1.0f - DIMMING_STEP) + DIMMING_STEP);
-                //wait_ms(100);
+                analog_dimming = 1.0f - led->GetCurrent();
                 action = SWITCH_STATE;
                 break;
         }
-    }
-
-    /* Writing PWM and Analog dimming values to the LED and printing to the console. */
-    if (action != NO_ACTION)
-    {
-        if (action == SWITCH_POWER)
-            if (power_on)
-            {
-                /* Initializing PWM and Analog dimming to maximum values. */
-                pwm_dimming = 1.0f;
-                analog_dimming = 1.0f;
 
-                /* Printing to the console. */
-                printf("Power ON\r\n");
-            }
-            else
-            {
-                /* Powering OFF the LED. */
-                led->PowerOFF();
+        /* Writing PWM and Analog dimming values to the LED. */
+        if (action != NO_ACTION)
+        {
+            /* Printing to the console. */
+            printf("%d) %-26s PWM/Analog: %.3f %.3f\r", demo + 1, demos[demo], pwm_dimming, analog_dimming);
 
-                /* Printing to the console. */
-                printf("Power OFF\r\n");
-            }
-
-        if (power_on)
-        {
             /* Writing PWM and Analog dimming values to the LED. */
             led->SetPWMDimming(pwm_dimming);
             led->SetAnalogDimming(analog_dimming);
-
-            /* Printing to the console. */
-            printf("%-24s PWM/Analog: %.3f %.3f\r\n", demos[demo], pwm_dimming, analog_dimming);
         }
+    }
     
-        /* Resetting action. */
-        action = NO_ACTION;
-    }
+    /* Resetting the action. */
+    action = NO_ACTION;
 }
 
 /**