main.cpp

00001 /**
00002  ******************************************************************************
00003  * @file    main.cpp
00004  * @author  Davide Aliprandi, STMicroelectronics
00005  * @version V1.0.0
00006  * @date    February 4h, 2016
00007  * @brief   mbed test application for the STMicroelectronics X-NUCLEO-LED61A1
00008  *          LED expansion board.
00009  ******************************************************************************
00010  * @attention
00011  *
00012  * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
00013  *
00014  * Redistribution and use in source and binary forms, with or without modification,
00015  * are permitted provided that the following conditions are met:
00016  *   1. Redistributions of source code must retain the above copyright notice,
00017  *      this list of conditions and the following disclaimer.
00018  *   2. Redistributions in binary form must reproduce the above copyright notice,
00019  *      this list of conditions and the following disclaimer in the documentation
00020  *      and/or other materials provided with the distribution.
00021  *   3. Neither the name of STMicroelectronics nor the names of its contributors
00022  *      may be used to endorse or promote products derived from this software
00023  *      without specific prior written permission.
00024  *
00025  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00026  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00027  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00028  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
00029  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00030  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
00031  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
00032  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00033  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00034  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00035  *
00036  ******************************************************************************
00037  */
00038 
00039 
00040 /* Includes ------------------------------------------------------------------*/
00041 
00042 /* mbed specific header files. */
00043 #include "mbed.h"
00044 #include "rtos.h"
00045 
00046 /* Component specific header files. */
00047 #include "Led6001.h"
00048 
00049 
00050 /* Definitions ---------------------------------------------------------------*/
00051 
00052 /* PI. */
00053 #ifndef M_PI
00054     #define M_PI                          (3.14159265358979323846f)
00055 #endif
00056 
00057 /* Loop period in micro-seconds. */
00058 #define LOOP_PERIOD_us                    (5E5) /* 0.5 seconds. */
00059 
00060 /* Sin period in micro-seconds. */
00061 #define PWM_SIN_PERIOD_us                 (1E7) /* 10 seconds. */
00062 
00063 
00064 /* Variables -----------------------------------------------------------------*/
00065 
00066 /* Main loop's ticker. */
00067 static Ticker ticker;
00068 
00069 /* LED Control Component. */
00070 Led6001 *led;
00071 
00072 /* Interrupt flags. */
00073 static volatile bool ticker_irq_triggered = false;
00074 static volatile bool xfault_irq_triggered = false;
00075 
00076 
00077 /* Functions -----------------------------------------------------------------*/
00078 
00079 /**
00080  * @brief  Handling the LED capabilities.
00081  * @param  None.
00082  * @retval None.
00083  */
00084 void led_handler(void)
00085 {
00086     static int tick = 0;
00087 
00088     /* Handling the LED dimming when powered ON. */
00089     float pwm_dimming = 0.5f * sin(2 * M_PI * (tick++ * LOOP_PERIOD_us) / PWM_SIN_PERIOD_us) + 0.5f;
00090     tick %= (int) (PWM_SIN_PERIOD_us / LOOP_PERIOD_us);
00091 
00092     /* Printing to the console. */
00093     printf("Sinusoidal PWM Dimming --> %0.2f\r", pwm_dimming);
00094 
00095     /*
00096        Writing PWM dimming values to the LED.
00097 
00098        Notes:
00099          + Replace "set_pwm_dimming()" with "set_analog_dimming()" for an analog control.
00100     */
00101     led->set_pwm_dimming(pwm_dimming);
00102 }
00103 
00104 /**
00105  * @brief  Interrupt Request for the main loop's ticker related interrupt.
00106  * @param  None.
00107  * @retval None.
00108  */
00109 void ticker_irq(void)
00110 {
00111     ticker_irq_triggered = true;
00112 }
00113 
00114 /**
00115  * @brief  Interrupt Request for the component's XFAULT interrupt.
00116  * @param  None.
00117  * @retval None.
00118  */
00119 void xfault_irq(void)
00120 {
00121     xfault_irq_triggered = true;
00122     led->disable_xfault_irq();
00123 }
00124 
00125 /**
00126  * @brief  Interrupt Handler for the component's XFAULT interrupt.
00127  * @param  None.
00128  * @retval None.
00129  */
00130 void xfault_handler(void)
00131 {
00132     /* Printing to the console. */
00133     printf("XFAULT Interrupt detected! Re-initializing LED driver...");
00134 
00135     /* Re-starting-up LED Control Component. */
00136     led->start_up();
00137 
00138     /* Printing to the console. */
00139     printf("Done.\r\n\n");
00140 
00141     led->enable_xfault_irq();
00142 }
00143 
00144 
00145 /* Main ----------------------------------------------------------------------*/
00146 
00147 int main()
00148 {
00149     /*----- Initialization. -----*/
00150 
00151     /* Printing to the console. */
00152     printf("LED Control Application Example\r\n\n");
00153 
00154     /* Initializing LED Control Component. */
00155     led = new Led6001(D4, A3, D6, D5);
00156     if (led->init() != COMPONENT_OK)
00157         exit(EXIT_FAILURE);
00158 
00159     /* Attaching interrupt request functions. */
00160     led->attach_xfault_irq(&xfault_irq);
00161     led->enable_xfault_irq();
00162     ticker.attach_us(ticker_irq, LOOP_PERIOD_us);
00163 
00164     /* Starting-up LED Control Component. */
00165     led->start_up();
00166 
00167 
00168     /*----- LED Control. -----*/
00169 
00170     /* Either performing the component handler, interrupt handlers, or waiting for events. */
00171     while (true)
00172     {
00173         if (ticker_irq_triggered)
00174         {
00175             ticker_irq_triggered = false;
00176             led_handler();
00177         } else if (xfault_irq_triggered)
00178         {
00179             xfault_irq_triggered = false;
00180             xfault_handler();
00181         } else {
00182             /* It is recommended that SEVONPEND in the System Control Register is NOT set. */
00183             __WFE();
00184         }
00185     }
00186 }