msp430/main.c

   1 #include <msp430.h>
   2
   3 static volatile unsigned int ADC_Result;
   4 static volatile unsigned int irq_events = 0;
   5 enum {ev_btn1 = 0, ev_btn2, ev_pir1, ev_pir2, ev_tmr, ev_adc, ev_MAX};
   6
   7 #define PWM_ORDER 10
   8 #define PWM_HALF 5
   9 #define LIGHT_THRESHOLD 900
  10 #define TIME_ON 320
  11
  12 #ifdef ADCSC /* Let us hope that this is a "new" model */
  13 # define BIT_RL BIT0
  14 # define BIT_GL BIT1
  15 # define PBTN(x) P2##x
  16 # define BIT_BTN BIT3
  17 # define HAVE_BTN2
  18 # define BIT_BTN2 BIT7
  19 #else
  20 # define BIT_RL BIT0
  21 # define BIT_GL BIT6
  22 # define PBTN(x) P1##x
  23 # define BIT_BTN BIT3
  24 # define BIT_BTN2 0
  25 #endif
  26
  27 static int expon2(int duty)
  28 {
  29         int shift = duty>>1;
  30         int comp = 1<<shift;
  31         int extra = (duty & 1) ? comp>>1 : 0;
  32         return (duty ? comp|extra : 0);
  33 }
  34
  35 int main(void)
  36 {
  37         int Duty_Cycle = 0;
  38         int Increment = 1;
  39         unsigned int Time_Left = 50;
  40         unsigned int Time_Indicate = 2;
  41
  42         WDTCTL = WDTPW | WDTHOLD;       // stop watchdog timer
  43         // Configure GPIO Out
  44         P1DIR |= BIT_RL|BIT_GL|BIT2;    // Set LEDs & PWM to output direction
  45         P1OUT &= ~(BIT_RL|BIT_GL);      // LEDs off
  46 #ifdef P1SEL1
  47         P1SEL1 |= BIT2;                 // PWM out
  48 #else
  49         P1SEL |= BIT2;                  // PWM out
  50 #endif
  51
  52         // Configure GPIO In
  53         PBTN(DIR) &= ~(BIT_BTN|BIT_BTN2);       // Buttons
  54         PBTN(OUT) |= BIT_BTN|BIT_BTN2;          // Pull up
  55         PBTN(REN) |= BIT_BTN|BIT_BTN2;          // Enable pull-up
  56         PBTN(IES) |= BIT_BTN|BIT_BTN2;          // INT on Hi->Lo edge
  57         PBTN(IE)  |= BIT_BTN|BIT_BTN2;          // INT enable
  58
  59         P2DIR &= ~(BIT4|BIT5);          // PIR Sensors
  60         P2OUT &= ~(BIT4|BIT5);          // Pull down
  61         P2REN |= BIT4|BIT5;             // Enable pull-down
  62         P2IES &= ~(BIT4|BIT5);          // INT on Lo->Hi edge
  63         P2IE  |= BIT4|BIT5;             // INT enable
  64
  65         // Configure ADC10
  66
  67 #ifdef ADCPCTL4 /* Newer model */
  68         SYSCFG2 |= ADCPCTL4|ADCPCTL5;   // disconnect pin 4 and 5 from GPIO
  69         ADCCTL0 |= ADCSHT_2 | ADCON;    // ADCON, S&H=16 ADC clks
  70         ADCCTL1 |= ADCSHP;              // ADCCLK = MODOSC; sampling timer
  71         ADCCTL2 |= ADCRES;              // 10-bit conversion results
  72         ADCMCTL0 |= ADCINCH_4;          // A4 ADC input select; Vref=AVCC
  73         ADCIE |= ADCIE0;                // Enable ADC conv complete interrupt
  74         // channel 5 is unused, reserved for measuring current
  75 #else
  76         ADC10CTL0 = ADC10SHT_2 + ADC10ON + ADC10IE; // ADCON, S&H=16 ADC clks
  77         ADC10CTL1 = INCH_4;             // A4 ADC input select
  78         // channel 5 is unused, reserved for measuring current
  79 #endif
  80
  81         // Timer and PWM
  82
  83 #ifndef TASSEL__SMCLK
  84 # define TASSEL__SMCLK TASSEL_2
  85 # define MC__UP MC_1
  86 # define MC__CONTINUOUS MC_2
  87 # define TA0CCR2 TA0CCR1
  88 # define TA0CCTL2 TA0CCTL1
  89 #endif
  90
  91         // Configure timer A0 for PWM
  92         TA0CCR0 = 1 << PWM_ORDER;       // PWM Period 2^10 ca. 1 kHz
  93         TA0CCR2 = 0;                    // CCR1 PWM duty cycle
  94         TA0CCTL2 = OUTMOD_7;            // CCR1 reset/set
  95         TA0CTL = TASSEL__SMCLK | MC__UP | TACLR;// SMCLK, up mode
  96                 // SMCLK, no divider, up mode, no interrupt, clear TAR
  97
  98         //Configure timer A1 for counting time
  99         TA1CTL |= TASSEL__SMCLK | MC__CONTINUOUS | TACLR | TAIE;
 100                 // SMCLK, no divider, continuous mode, interrupt enable
 101
 102 #ifdef LOCKLPM5
 103         // Disable the GPIO power-on default high-impedance mode to activate
 104         // previously configured port settings
 105         PM5CTL0 &= ~LOCKLPM5;
 106 #endif
 107
 108         while(1)
 109         {
 110                 unsigned int events;
 111
 112                 _disable_interrupts();
 113                 events = irq_events;
 114                 irq_events = 0;
 115                 _enable_interrupts();
 116
 117                 // Button 2 or PIR events initiate light measurement
 118                 // and tuns on green or red led
 119                 if (events & (1<<ev_btn2|1<<ev_pir1|1<<ev_pir2)) {
 120                         if (events & 1<<ev_pir1)
 121                                 P1OUT |= BIT_GL;        // Set green LED on
 122                         if (events & 1<<ev_pir2)
 123                                 P1OUT |= BIT_RL;        // Set red LED on
 124                         // Sampling and conversion start
 125 #ifdef ADCENC
 126                         ADCCTL0 |= ADCENC | ADCSC;
 127 #else
 128                         ADC10CTL0 |= ENC + ADC10SC;
 129 #endif
 130                 }
 131
 132                 // End of light measurement. Set new Duty_Cycle,
 133                 // zero increment and turn off green led
 134                 if (events & 1<<ev_adc) {
 135                         P1OUT ^= (BIT_GL|BIT_RL); // Flip green and red LEDs
 136                         Time_Indicate = 5;
 137                         if (ADC_Result < LIGHT_THRESHOLD)
 138                                 continue;
 139                         Time_Left = TIME_ON;
 140                         Increment = 1;
 141                 }
 142
 143                 // Button 1 sets non-zero increment (and toggles it)
 144                 if (events & 1<<ev_btn1) {
 145                         P1OUT |= (BIT_GL|BIT_RL); // Set green and red LEDs on
 146                         Time_Indicate = 5;
 147                         if (Duty_Cycle > PWM_HALF) {
 148                                 Time_Left = 0;
 149                                 Increment = -1;
 150                         } else {
 151                                 Time_Left = TIME_ON;
 152                                 Increment = 1;
 153                         }
 154                 }
 155
 156                 // Timer event (100 ms) changed duty cycle and flashes red led
 157                 if (events & 1<<ev_tmr) {
 158                         if (Time_Indicate) {
 159                                 Time_Indicate--;
 160                                 if (!Time_Indicate)
 161                                         P1OUT &= ~(BIT_RL|BIT_GL); // LEDs off
 162                         }
 163                         if (Time_Left) {
 164                                 Time_Left--;
 165                                 if (!Time_Left)
 166                                         if (Duty_Cycle)
 167                                                 Increment = -1;
 168                         }
 169                         if (Increment > 0) {
 170                                 if (++Duty_Cycle >= (PWM_ORDER<<1)) {
 171                                         Duty_Cycle = PWM_ORDER<<1;
 172                                         Increment = 0;
 173                                 }
 174                         } else if (Increment < 0) {
 175                                 if (--Duty_Cycle < 1) {
 176                                         Duty_Cycle = 0;
 177                                         Increment = 0;
 178                                 }
 179                         } else // Increment _was_ zero - no change!
 180                                 continue;
 181
 182                         TA0CCR2 = expon2(Duty_Cycle);
 183                 }
 184                 __bis_SR_register(LPM0_bits | GIE);
 185                 __no_operation();
 186         }
 187         return 0; /* not reached */
 188 }
 189
 190 // TIMER interrupt routine
 191 #if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
 192 #pragma vector = TIMER1_A1_VECTOR
 193 __interrupt void Timer_A (void)
 194 #elif defined(__GNUC__)
 195 void __attribute__ ((interrupt(TIMER1_A1_VECTOR))) Timer_A (void)
 196 #else
 197 #error Compiler not supported!
 198 #endif
 199 {
 200         switch(__even_in_range(TA1IV,TA1IV_TAIFG))
 201         {
 202                 case TA1IV_NONE:
 203                         break;  // No interrupt
 204                 case TA1IV_TACCR1:
 205                         break;  // CCR1 not used
 206                 case TA1IV_TACCR2:
 207                         break;  // CCR2 not used
 208                 case TA1IV_TAIFG:
 209                         irq_events |= 1<<ev_tmr;
 210                         __bic_SR_register_on_exit(LPM0_bits);   // Wake up
 211                         break;
 212                 default:
 213                         break;
 214         }
 215 }
 216
 217 #ifndef ADC_VECTOR
 218 # define ADCMEM0 ADC10MEM
 219 # define ADC_VECTOR ADC10_VECTOR
 220 #endif
 221
 222 // ADC interrupt service routine
 223 #if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
 224 #pragma vector=ADC_VECTOR
 225 __interrupt void ADC_ISR(void)
 226 #elif defined(__GNUC__)
 227 void __attribute__ ((interrupt(ADC_VECTOR))) ADC_ISR (void)
 228 #else
 229 #error Compiler not supported!
 230 #endif
 231 {
 232 #ifdef ADCIV_NONE
 233         switch(__even_in_range(ADCIV,ADCIV_ADCIFG))
 234         {
 235                 case ADCIV_NONE:
 236                         break;
 237                 case ADCIV_ADCOVIFG:
 238                         break;
 239                 case ADCIV_ADCTOVIFG:
 240                         break;
 241                 case ADCIV_ADCHIIFG:
 242                         break;
 243                 case ADCIV_ADCLOIFG:
 244                         break;
 245                 case ADCIV_ADCINIFG:
 246                         break;
 247                 case ADCIV_ADCIFG:
 248 #endif
 249                         ADC_Result = ADCMEM0;
 250                         irq_events |= 1<<ev_adc;
 251                         __bic_SR_register_on_exit(LPM0_bits);   // Wake up
 252 #ifdef ADCIV_NONE
 253                         break;
 254                 default:
 255                         break;
 256         }
 257 #endif
 258 }
 259
 260 // GPIO interrupt service routine
 261 #if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
 262 #pragma vector=PORT2_VECTOR
 263 __interrupt void Port_2(void)
 264 #elif defined(__GNUC__)
 265 void __attribute__ ((interrupt(PORT2_VECTOR))) Port_2 (void)
 266 #else
 267 #error Compiler not supported!
 268 #endif
 269 {
 270         if (P2IFG & BIT4) {
 271                 irq_events |= 1<<ev_pir1;
 272                 P2IFG &= ~BIT4; // Clear P2.4 IFG
 273         }
 274         if (P2IFG & BIT5) {
 275                 irq_events |= 1<<ev_pir2;
 276                 P2IFG &= ~BIT5; // Clear P2.5 IFG
 277         }
 278 #if (PBTN() == P1)
 279         __bic_SR_register_on_exit(LPM0_bits);   // Wake up
 280 }
 281 // GPIO interrupt service routine
 282 #if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
 283 #pragma vector=PORT1_VECTOR
 284 __interrupt void Port_1(void)
 285 #elif defined(__GNUC__)
 286 void __attribute__ ((interrupt(PORT1_VECTOR))) Port_1 (void)
 287 #else
 288 #error Compiler not supported!
 289 #endif
 290 {
 291 #endif /* (PBTN() == P1) */
 292         if (PBTN(IFG) & BIT_BTN) {
 293                 irq_events |= 1<<ev_btn1;
 294                 PBTN(IFG) &= ~BIT_BTN;  // Clear button IFG
 295         }
 296 #ifdef HAVE_BTN2
 297         if (PBTN(IFG) & BIT_BTN2) {
 298                 irq_events |= 1<<ev_btn2;
 299                 PBTN(IFG) &= ~BIT_BTN2; // Clear button 2 IFG
 300         }
 301 #endif
 302         __bic_SR_register_on_exit(LPM0_bits);   // Wake up
 303 }