Cédric SAADAOUI CORREGE / Mbed 2 deprecated mbed_Blinky_PWM_SPI

1st release

Dependencies:   mbed

main.cpp@0:db5b31dd20a0, 2015-06-17 (annotated)

Committer:
CedricSC
Date:
Wed Jun 17 13:33:07 2015 +0000
Revision:
0:db5b31dd20a0
1st release

Who changed what in which revision?

UserRevisionLine numberNew contents of line
CedricSC 0:db5b31dd20a0 1 /*
CedricSC 0:db5b31dd20a0 2 * INCLUDES
CedricSC 0:db5b31dd20a0 3 */
CedricSC 0:db5b31dd20a0 4 #include "mbed.h"
CedricSC 0:db5b31dd20a0 5
CedricSC 0:db5b31dd20a0 6 /*
CedricSC 0:db5b31dd20a0 7 * CONSTANTES
CedricSC 0:db5b31dd20a0 8 */
CedricSC 0:db5b31dd20a0 9 const unsigned char AUDIO_VOLUME[10] = { 0, 28, 56, 84, 112, 140, 168, 197, 226, 255 };
CedricSC 0:db5b31dd20a0 10
CedricSC 0:db5b31dd20a0 11 /*
CedricSC 0:db5b31dd20a0 12 * VARIABLES GLOBALES
CedricSC 0:db5b31dd20a0 13 */
CedricSC 0:db5b31dd20a0 14 unsigned int global_PWM_Period;
CedricSC 0:db5b31dd20a0 15 unsigned int global_PWM_Duty;
CedricSC 0:db5b31dd20a0 16 unsigned int global_PWM_PeriodReload;
CedricSC 0:db5b31dd20a0 17 unsigned int global_PWM_DutyReload;
CedricSC 0:db5b31dd20a0 18 unsigned int global_PWM_Counter;
CedricSC 0:db5b31dd20a0 19 unsigned int global_PWM_State;
CedricSC 0:db5b31dd20a0 20
CedricSC 0:db5b31dd20a0 21 /*
CedricSC 0:db5b31dd20a0 22 * DEFINITION DES MODULES
CedricSC 0:db5b31dd20a0 23 */
CedricSC 0:db5b31dd20a0 24 // définitions des LEDs
CedricSC 0:db5b31dd20a0 25 //DigitalOut myLed1(LED1);
CedricSC 0:db5b31dd20a0 26 DigitalOut myLed2(LED2);
CedricSC 0:db5b31dd20a0 27 DigitalOut myLed3(LED3);
CedricSC 0:db5b31dd20a0 28 DigitalOut myLed4(LED4);
CedricSC 0:db5b31dd20a0 29 // définitions des boutons
CedricSC 0:db5b31dd20a0 30 DigitalIn myButton1(p17);
CedricSC 0:db5b31dd20a0 31 DigitalIn myButton2(p18);
CedricSC 0:db5b31dd20a0 32 DigitalIn myButton3(p19);
CedricSC 0:db5b31dd20a0 33 DigitalIn myButton4(p20);
CedricSC 0:db5b31dd20a0 34 // définitions du son
CedricSC 0:db5b31dd20a0 35 DigitalOut audioCS(p25);
CedricSC 0:db5b31dd20a0 36 SPI audioVolume(p5, NC, p7);
CedricSC 0:db5b31dd20a0 37 //DigitalOut audioPWM(p26);
CedricSC 0:db5b31dd20a0 38 DigitalOut audioPWM(LED1);
CedricSC 0:db5b31dd20a0 39 Ticker tickerPWM;
CedricSC 0:db5b31dd20a0 40
CedricSC 0:db5b31dd20a0 41 /*
CedricSC 0:db5b31dd20a0 42 * INTERRUPTIONS
CedricSC 0:db5b31dd20a0 43 */
CedricSC 0:db5b31dd20a0 44 // interruption permettant la génération du PWM
CedricSC 0:db5b31dd20a0 45 void IRQ_PWM( void )
CedricSC 0:db5b31dd20a0 46 {
CedricSC 0:db5b31dd20a0 47 // si un signal PWM doit etre généré
CedricSC 0:db5b31dd20a0 48 if( global_PWM_Period ){
CedricSC 0:db5b31dd20a0 49 // incrémente le compteur
CedricSC 0:db5b31dd20a0 50 global_PWM_Counter++;
CedricSC 0:db5b31dd20a0 51 // si l'état de la pin de PWM est haute ( duty < counter < period )
CedricSC 0:db5b31dd20a0 52 if( global_PWM_State ){
CedricSC 0:db5b31dd20a0 53 // si le compteur dépasse la période
CedricSC 0:db5b31dd20a0 54 if( global_PWM_Counter >= global_PWM_Period ){
CedricSC 0:db5b31dd20a0 55 // mise à 0 du signal
CedricSC 0:db5b31dd20a0 56 audioPWM = 0;
CedricSC 0:db5b31dd20a0 57 global_PWM_State = 0;
CedricSC 0:db5b31dd20a0 58 // reset du counter
CedricSC 0:db5b31dd20a0 59 global_PWM_Counter = 0;
CedricSC 0:db5b31dd20a0 60 // recharge la période du PWM
CedricSC 0:db5b31dd20a0 61 global_PWM_Period = global_PWM_PeriodReload;
CedricSC 0:db5b31dd20a0 62 // recharge le rapport cyclique du PWM
CedricSC 0:db5b31dd20a0 63 global_PWM_Duty = global_PWM_DutyReload;
CedricSC 0:db5b31dd20a0 64 }
CedricSC 0:db5b31dd20a0 65 // si l'état de la pîn de PWM est basse ( 0 < counter < duty )
CedricSC 0:db5b31dd20a0 66 }else{
CedricSC 0:db5b31dd20a0 67 // si le compteur dépasse la période
CedricSC 0:db5b31dd20a0 68 if( global_PWM_Counter >= global_PWM_Duty ){
CedricSC 0:db5b31dd20a0 69 // mise à 0 du signal
CedricSC 0:db5b31dd20a0 70 audioPWM = 1;
CedricSC 0:db5b31dd20a0 71 global_PWM_State = 1;
CedricSC 0:db5b31dd20a0 72 }
CedricSC 0:db5b31dd20a0 73 }
CedricSC 0:db5b31dd20a0 74 }
CedricSC 0:db5b31dd20a0 75 }
CedricSC 0:db5b31dd20a0 76
CedricSC 0:db5b31dd20a0 77 /*
CedricSC 0:db5b31dd20a0 78 * SOUS PROGRAMMES
CedricSC 0:db5b31dd20a0 79 */
CedricSC 0:db5b31dd20a0 80 void audio_SetVolume( unsigned int volumeIndex )
CedricSC 0:db5b31dd20a0 81 {
CedricSC 0:db5b31dd20a0 82 audioCS = 0;
CedricSC 0:db5b31dd20a0 83 audioVolume.write( AUDIO_VOLUME[volumeIndex] );
CedricSC 0:db5b31dd20a0 84 audioCS = 1;
CedricSC 0:db5b31dd20a0 85 }
CedricSC 0:db5b31dd20a0 86
CedricSC 0:db5b31dd20a0 87 void UpdatePWM( unsigned int period, unsigned int duty )
CedricSC 0:db5b31dd20a0 88 {
CedricSC 0:db5b31dd20a0 89 global_PWM_PeriodReload = period;
CedricSC 0:db5b31dd20a0 90 global_PWM_DutyReload = duty;
CedricSC 0:db5b31dd20a0 91 }
CedricSC 0:db5b31dd20a0 92
CedricSC 0:db5b31dd20a0 93 void InitPWM( void )
CedricSC 0:db5b31dd20a0 94 {
CedricSC 0:db5b31dd20a0 95 // définition de la fonction qui gère le signal PWM (appellée toutes les 10µs)
CedricSC 0:db5b31dd20a0 96 tickerPWM.attach_us( &IRQ_PWM, 10 );
CedricSC 0:db5b31dd20a0 97 // reset des variables liées au PWM
CedricSC 0:db5b31dd20a0 98 global_PWM_Counter = 0;
CedricSC 0:db5b31dd20a0 99 global_PWM_Period = 0;
CedricSC 0:db5b31dd20a0 100 global_PWM_PeriodReload = 0;
CedricSC 0:db5b31dd20a0 101 global_PWM_Duty = 0;
CedricSC 0:db5b31dd20a0 102 global_PWM_DutyReload = 0;
CedricSC 0:db5b31dd20a0 103 global_PWM_State = 0;
CedricSC 0:db5b31dd20a0 104 audioPWM = 0;
CedricSC 0:db5b31dd20a0 105 }
CedricSC 0:db5b31dd20a0 106
CedricSC 0:db5b31dd20a0 107 /*
CedricSC 0:db5b31dd20a0 108 * FONCTION PRINCIPALE
CedricSC 0:db5b31dd20a0 109 */
CedricSC 0:db5b31dd20a0 110 int main()
CedricSC 0:db5b31dd20a0 111 {
CedricSC 0:db5b31dd20a0 112 // variable locale
CedricSC 0:db5b31dd20a0 113 unsigned char i;
CedricSC 0:db5b31dd20a0 114 unsigned int delay;
CedricSC 0:db5b31dd20a0 115 unsigned char flagStart, flagSens;
CedricSC 0:db5b31dd20a0 116
CedricSC 0:db5b31dd20a0 117 // initialise les variables
CedricSC 0:db5b31dd20a0 118 i = 0;
CedricSC 0:db5b31dd20a0 119 delay = 200;
CedricSC 0:db5b31dd20a0 120 flagStart = 1;
CedricSC 0:db5b31dd20a0 121 flagSens = 0;
CedricSC 0:db5b31dd20a0 122 // boucle de fonctionnement principale
CedricSC 0:db5b31dd20a0 123 while(1) {
CedricSC 0:db5b31dd20a0 124 /* // si l'application est lancée
CedricSC 0:db5b31dd20a0 125 if( flagStart )
CedricSC 0:db5b31dd20a0 126 {
CedricSC 0:db5b31dd20a0 127 // éteint toutes les LED
CedricSC 0:db5b31dd20a0 128 myLed1 = 1;
CedricSC 0:db5b31dd20a0 129 myLed2 = 1;
CedricSC 0:db5b31dd20a0 130 myLed3 = 1;
CedricSC 0:db5b31dd20a0 131 myLed4 = 1;
CedricSC 0:db5b31dd20a0 132 // en fonction de la valeur de i
CedricSC 0:db5b31dd20a0 133 switch( i & 0x03 )
CedricSC 0:db5b31dd20a0 134 {
CedricSC 0:db5b31dd20a0 135 case 0 :
CedricSC 0:db5b31dd20a0 136 myLed1 = 0;
CedricSC 0:db5b31dd20a0 137 break;
CedricSC 0:db5b31dd20a0 138 case 1 :
CedricSC 0:db5b31dd20a0 139 myLed2 = 0;
CedricSC 0:db5b31dd20a0 140 break;
CedricSC 0:db5b31dd20a0 141 case 2 :
CedricSC 0:db5b31dd20a0 142 myLed4 = 0;
CedricSC 0:db5b31dd20a0 143 break;
CedricSC 0:db5b31dd20a0 144 case 3 :
CedricSC 0:db5b31dd20a0 145 myLed3 = 0;
CedricSC 0:db5b31dd20a0 146 break;
CedricSC 0:db5b31dd20a0 147 }
CedricSC 0:db5b31dd20a0 148 // délay d'attente
CedricSC 0:db5b31dd20a0 149 wait_ms(delay);
CedricSC 0:db5b31dd20a0 150 // si le sens est positif
CedricSC 0:db5b31dd20a0 151 if( flagSens ){
CedricSC 0:db5b31dd20a0 152 // incrémente le compteur
CedricSC 0:db5b31dd20a0 153 i++;
CedricSC 0:db5b31dd20a0 154 // si le sens est négatif
CedricSC 0:db5b31dd20a0 155 }else{
CedricSC 0:db5b31dd20a0 156 // décrémente le compteur
CedricSC 0:db5b31dd20a0 157 i--;
CedricSC 0:db5b31dd20a0 158 }
CedricSC 0:db5b31dd20a0 159 }
CedricSC 0:db5b31dd20a0 160 */ // si appuie sur bouton 1
CedricSC 0:db5b31dd20a0 161 if(!myButton1){
CedricSC 0:db5b31dd20a0 162 led = led - 0.1;
CedricSC 0:db5b31dd20a0 163 // change l'état de marche arret
CedricSC 0:db5b31dd20a0 164 flagStart ^= 0x01;
CedricSC 0:db5b31dd20a0 165 // attend que le bouton soit relaché
CedricSC 0:db5b31dd20a0 166 while( !myButton1 );
CedricSC 0:db5b31dd20a0 167 }
CedricSC 0:db5b31dd20a0 168 // si appuie sur bouton 2
CedricSC 0:db5b31dd20a0 169 if(!myButton2){
CedricSC 0:db5b31dd20a0 170 led = led + 0.1;
CedricSC 0:db5b31dd20a0 171 // change le sens
CedricSC 0:db5b31dd20a0 172 flagSens ^= 0x01;
CedricSC 0:db5b31dd20a0 173 // attend que le bouton soit relaché
CedricSC 0:db5b31dd20a0 174 while( !myButton2 );
CedricSC 0:db5b31dd20a0 175 }
CedricSC 0:db5b31dd20a0 176 // si appuie sur bouton 3
CedricSC 0:db5b31dd20a0 177 if(!myButton3){
CedricSC 0:db5b31dd20a0 178 // réduit le délay de changement
CedricSC 0:db5b31dd20a0 179 delay -= 10;
CedricSC 0:db5b31dd20a0 180 // attend que le bouton soit relaché
CedricSC 0:db5b31dd20a0 181 while( !myButton3 );
CedricSC 0:db5b31dd20a0 182 }
CedricSC 0:db5b31dd20a0 183 // si appuie sur bouton 4
CedricSC 0:db5b31dd20a0 184 if(!myButton4){
CedricSC 0:db5b31dd20a0 185 // augmente le délay de changement
CedricSC 0:db5b31dd20a0 186 delay += 10;
CedricSC 0:db5b31dd20a0 187 // attend que le bouton soit relaché
CedricSC 0:db5b31dd20a0 188 while( !myButton4 );
CedricSC 0:db5b31dd20a0 189 }
CedricSC 0:db5b31dd20a0 190 }
CedricSC 0:db5b31dd20a0 191 }