HMI_Button.cpp

00001 #include "HMI.h"
00002 
00003 using namespace FSM_Button;
00004 bool bouncing = false;
00005 bool trigger_standby = false;
00006 bool display_on = false;
00007 volatile bool RE_detected = false;
00008 bool next_screen = false;
00009 bool renew_screen = false;
00010 
00011 #define DEBOUNCE_DURATION_MS 200
00012 #define HIGH_LEVEL_DURATION 2
00013 
00014 /* 
00015 Rising_edge flag is on ? Idle state => Debounce 
00016     - Start chronometer
00017  */
00018 unsigned int FSM_Button::button_idle(void)
00019 {   
00020     if (!RE_detected)
00021         return FSM_Button::State_Idle;
00022     timer.start();
00023     return FSM_Button::State_Debounce;
00024 }
00025 
00026 /*
00027 timer < Wait Duration ? Debounce => Debounce.
00028     - All incoming button signals are ignored during this time.
00029 timer >= Wait Duration ? Debounce => Pressed
00030 */
00031 unsigned int FSM_Button::button_debounce(void)
00032 {
00033     if (timer.read_ms() < DEBOUNCE_DURATION_MS)
00034         return FSM_Button::State_Debounce;
00035     return FSM_Button::State_Pressed;
00036 }
00037 /*
00038 button signal on high level ? Pressed => Pressed
00039     - timer > 2~5 s  ?  Trigger screen standby on.
00040 button signal on low level ? Pressed => Released
00041     - Change display
00042 */
00043 
00044 unsigned int FSM_Button::button_pressed(void)
00045 {
00046     if(button) {
00047         if(timer.read() >= HIGH_LEVEL_DURATION)
00048             trigger_standby = true;
00049         return FSM_Button::State_Pressed;    
00050     }
00051     //led = 0;
00052     renew_screen = true;
00053     next_screen = true;
00054     return FSM_Button::State_Released;
00055 }
00056 
00057 /*
00058 Released => Wait
00059     - Restart timer.
00060     - Initialize standby trigger flag.
00061     - Initialize rising edge detection flag.
00062 */
00063 unsigned int FSM_Button::button_released(void)
00064 {   
00065     RE_detected = false;
00066     trigger_standby = false; 
00067     timer.reset();
00068     return FSM_Button::State_Wait;
00069 }
00070 /*
00071 
00072 timer < Wait Duration ? Wait => Wait.
00073     - All incoming button signals are ignored during this time.
00074 timer >= Wait Duration ? Wait => Idle
00075     - Stop and reset timer.
00076 */
00077 unsigned int FSM_Button::button_wait(void)
00078 {
00079     if (timer.read_ms() < DEBOUNCE_DURATION_MS)
00080         return FSM_Button::State_Wait;
00081     timer.stop();
00082     timer.reset();
00083     return FSM_Button::State_Idle;
00084 }