LED Control with the X-NUCLEO-LED61A1 Expansion Board

Diff: main.cpp

Revision:

7:7a608b07fa9f

Parent:

6:899828fd9d9d

Child:

13:97083451e538

--- a/main.cpp	Fri Jan 15 17:12:03 2016 +0000
+++ b/main.cpp	Thu Feb 04 10:29:42 2016 +0000
@@ -3,7 +3,7 @@
  * @file    main.cpp
  * @author  Davide Aliprandi, STMicroelectronics
  * @version V1.0.0
- * @date    December 9th, 2015
+ * @date    February 4h, 2016
  * @brief   mbed test application for the STMicroelectronics X-NUCLEO-LED61A1
  *          LED expansion board.
  ******************************************************************************
@@ -54,44 +54,13 @@
 #endif
 
 /* Loop period in micro-seconds. */
-#define LOOP_PERIOD_us                (1E5)
+#define LOOP_PERIOD_us                (5E5) /* 0.5 seconds. */
 
 /* 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)
-#define SWITCH_POWER_BUTTON_PRESS_ms  (2000)
+#define PWM_SIN_PERIOD_us             (1E7) /* 10 seconds. */
 
 /* Duration of initialization interval in milli-seconds. */
-#define INITIALIZATION_INTERVAL_ms    (2000)
-
-/* Dimming Step. */
-#define DIMMING_STEP                  (0.05f)
-
-
-/* Types ---------------------------------------------------------------------*/
-
-/* Demos. */
-typedef enum
-{
-  MANUAL_PWM_DIMMING = 0,
-  MANUAL_ANALOG_DIMMING,
-  AUTOMATIC_PWM_DIMMING,
-  AUTOMATIC_ANALOG_DIMMING,
-  PHOTO_BASED_ANALOG_DIMMING,
-  LED_DEMO_SIZE
-} LED_Demo_t;
-
-/* Actions. */
-typedef enum
-{
-  SWITCH_POWER = 0,
-  SWITCH_DEMO,
-  SWITCH_STATE,
-  NO_ACTION
-} LED_Action_t;
+#define INITIALIZATION_INTERVAL_ms    (2E3) /* 2 seconds. */
 
 
 /* Variables -----------------------------------------------------------------*/
@@ -99,39 +68,15 @@
 /* Main loop's ticker. */
 static Ticker ticker;
 
-/* User Button's interrupt. */
-static InterruptIn button(USER_BUTTON);
-
-/* MCU Board's Led which provides the user with a visual feedback on
-   the user button's status (ON = pressed, OFF = released). */
-DigitalOut button_pressed_led(LED1);
-
 /* LED Control Component. */
 LED6001 *led;
 
 /* Interrupt flags. */
 static volatile bool ticker_irq_triggered;
-static volatile bool button_irq_triggered;
 static volatile bool xfault_irq_triggered;
 
-/* Demo State. */
-static volatile LED_Demo_t demo;
-static volatile LED_Action_t action;
-static volatile bool power_on;
-
-/* PWM and Analog dimming values. */
+/* PWM dimming values. */
 static float pwm_dimming;
-static float analog_dimming;
-
-/* Demos' Names. */
-static char* demos[] =
-{
-    "Manual PWM Dimming",
-    "Manual Analog Dimming",
-    "Sinusoidal PWM Dimming",
-    "Sinusoidal Analog Dimming",
-    "Photo-based Analog Dimming"
-};
 
 
 /* Functions -----------------------------------------------------------------*/
@@ -147,18 +92,11 @@
     printf("Initializing LED driver...");
 
     /* Initializing Interrupt flags. */
-    button_irq_triggered = false;
     xfault_irq_triggered = false;
     ticker_irq_triggered = false;
 
-    /* Initializing Demo. */
-    power_on = true;
-    action = SWITCH_DEMO;
-    demo = (LED_Demo_t) (LED_DEMO_SIZE - 1);
-
-    /* Initializing PWM and Analog dimming to maximum values. */
+    /* Initializing PWM dimming to maximum values. */
     pwm_dimming = 1.0f;
-    analog_dimming = 1.0f;
 
     /* Start-up sequence. */
     led->PowerOFF();
@@ -166,11 +104,11 @@
     led->PowerON();
 
     /* Printing to the console. */
-    printf("Done.\r\n\nDemo:\r\n");
+    printf("Done.\r\n\n");
 }
 
 /**
- * @brief  Handling the LED capabilities and executing several demos.
+ * @brief  Handling the LED capabilities.
  * @param  None.
  * @retval None.
  */
@@ -178,96 +116,20 @@
 {
     static int tick = 0;
 
-    /* Handling the power switch. */
-    if (action == SWITCH_POWER)
-    {
-        /* Switching the LED power ON/OFF. */
-        power_on = !power_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");
+    /* Handling the LED dimming when powered ON. */
+    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);
 
-            /* Powering OFF the LED. */
-            led->PowerOFF();
-        }
-    }
-
-    /* Handling the LED dimming when powered ON. */
-    if (power_on)
-    {
-        /* Switching to the next demo. */
-        if (action == SWITCH_DEMO)
-        {
-            pwm_dimming = 1.0f;
-            analog_dimming = 1.0f;
-            tick = 0;
-            demo = (LED_Demo_t) ((demo + 1) % LED_DEMO_SIZE);
-        }
+    /* Printing to the console. */
+    printf("Sinusoidal PWM Dimming --> %0.2f\r", pwm_dimming);
 
-        /* Setting the LED dimming depending on the selected demo. */
-        switch (demo)
-        {
-            /* Changing PWM dimming according to the user button. */
-            case MANUAL_PWM_DIMMING:
-                if (action == SWITCH_STATE)
-                {
-                    pwm_dimming -= DIMMING_STEP;
-                    pwm_dimming = (pwm_dimming < 0.0f ? 1.0f : pwm_dimming);
-                }
-                break;
-
-            /* Changing Analog dimming according to the user button. */
-            case MANUAL_ANALOG_DIMMING:
-                if (action == SWITCH_STATE)
-                {
-                    analog_dimming -= DIMMING_STEP;
-                    analog_dimming = (analog_dimming < 0.0f ? 1.0f : analog_dimming);
-                }
-                break;
-
-            /* Changing PWM dimming continuously. */
-            case AUTOMATIC_PWM_DIMMING:
-                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;
+    /*
+       Writing PWM dimming values to the LED.
 
-            /* Changing Analog dimming continuously. */
-            case AUTOMATIC_ANALOG_DIMMING:
-                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 PHOTO_BASED_ANALOG_DIMMING:
-                analog_dimming = 1.0f - led->GetCurrent();
-                action = SWITCH_STATE;
-                break;
-        }
-
-        /* Writing PWM and Analog dimming values to the LED. */
-        if (action != NO_ACTION)
-        {
-            /* Printing to the console. */
-            printf("%d) %-26s --> Dimming: %0.2f\r", demo + 1, demos[demo], demo == MANUAL_PWM_DIMMING || demo == AUTOMATIC_PWM_DIMMING ? pwm_dimming : analog_dimming);
-
-            /* Writing PWM and Analog dimming values to the LED. */
-            led->SetPWMDimming(pwm_dimming);
-            led->SetAnalogDimming(analog_dimming);
-        }
-    }
-    
-    /* Resetting the action. */
-    action = NO_ACTION;
+       Notes:
+         + Replace "SetPWMDimming()" with "SetAnalogDimming()" for an analog control.
+    */
+    led->SetPWMDimming(pwm_dimming);
 }
 
 /**
@@ -281,17 +143,6 @@
 }
 
 /**
- * @brief  Interrupt Request for the user button's interrupt.
- * @param  None.
- * @retval None.
- */
-void ButtonIRQ(void)
-{
-    button_irq_triggered = true;
-    button.disable_irq();
-}
-
-/**
  * @brief  Interrupt Request for the component's XFAULT interrupt.
  * @param  None.
  * @retval None.
@@ -303,43 +154,6 @@
 }
 
 /**
- * @brief  Interrupt Handler for the user button's interrupt.
- * @param  None.
- * @retval None.
- */
-void ButtonHandler(void)
-{
-    /* User Button's timer to measure the time the button remains pressed. */
-    static Timer button_pressed_timer;
-
-    bool button_pressed_flag = (button.read() == 0 ? true : false);
-
-    if (button_pressed_flag)
-    {
-        button_pressed_led = 1;
-        button_pressed_timer.start();
-    }
-    else
-    {
-        button_pressed_led = 0;
-        button_pressed_timer.stop();
-
-        /* Either changing current demo's state or switching to the next demo. */
-        int time_pressed = button_pressed_timer.read_ms();
-        if (time_pressed < SWITCH_DEMO_BUTTON_PRESS_ms)
-            action = SWITCH_STATE;
-        else if (time_pressed < SWITCH_POWER_BUTTON_PRESS_ms)
-            action = SWITCH_DEMO;
-        else
-            action = SWITCH_POWER;
-
-        button_pressed_timer.reset();
-    }
-
-    button.enable_irq();
-}
-
-/**
  * @brief  Interrupt Handler for the component's XFAULT interrupt.
  * @param  None.
  * @retval None.
@@ -363,16 +177,7 @@
     /*----- Initialization. -----*/
 
     /* Printing to the console. */
-    printf("LED Control Application Example\r\n\n" \
-           "Demos:\r\n");
-    int demo = 0;
-    for (demo = 0; demo < LED_DEMO_SIZE; demo++)
-        printf("%d) %-26s\r\n", demo, demos[demo]);
-    printf("\r\nActions:\r\n" \
-           "+ Short Button Press [<%.1fs]  --> Manual Dimming\r\n" \
-           "+ Medium Button Press         --> Switch Demo\r\n" \
-           "+ Long Button Press  [>%.1fs]  --> Switch Power ON/OFF\r\n\n" \
-           , SWITCH_DEMO_BUTTON_PRESS_ms / 1000.0f, SWITCH_POWER_BUTTON_PRESS_ms / 1000.0f);
+    printf("LED Control Application Example\r\n\n");
 
     /* Initializing LED Control Component. */
     led = new LED6001(D4, A3, D6, D5);
@@ -380,8 +185,6 @@
         exit(EXIT_FAILURE);
 
     /* Attaching interrupt request functions. */
-    button.fall(ButtonIRQ);
-    button.rise(ButtonIRQ);
     led->AttachXFaultIRQ(&XFaultIRQ);
     led->EnableXFaultIRQ();
     ticker.attach_us(TickerIRQ, LOOP_PERIOD_us);
@@ -399,10 +202,6 @@
         {
             ticker_irq_triggered = false;
             LEDHandler();
-        } else if (button_irq_triggered)
-        {
-            button_irq_triggered = false;
-            ButtonHandler();
         } else if (xfault_irq_triggered)
         {
             xfault_irq_triggered = false;