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