Rev Author Line No. Line
1861 kaklik 1 #include "reflow.h"
1960 kaklik 2 #include "process.h"
1861 kaklik 3 #include <math.h>
4  
5 // nastaveni teplot a casu
6 #define TEPLOTA_PREDEHREVU 120
7 #define DOBA_PREDEHREVU 60
8  
9 #define TEPLOTA_VRCHOLU 210
10 #define DOBA_VRCHOLU 5
11  
12 // CPU IO rozhrani
13 #define LCD_RS PIN_C1 // rizeni registru LCD displeje
14 #define LCD_E PIN_C2 // enable LCD displeje
15 #define LCD_DATA_LSB PIN_D0 // data LCD
16 #include "lcd.c"
17  
18 #define TL1 PIN_B3 // tlacitko S1
19 #define TL2 PIN_B2 // tlacitko S2
20 #define TL3 PIN_B1 // tlacitko S3
21 #define TL4 PIN_B0 // tlacitko S4
22  
1963 kaklik 23 #define POWER_T3 PIN_C4 // ovladani optotriaku T3
24 #define POWER_T4 PIN_C5 // ovladani optotriaku T4
25 #define POWER_T5 PIN_C6 // ovladani optotriaku T5
1861 kaklik 26  
27 #define ADC_PIN PIN_A0 //info, nelze menit - pin pouzit jako input analog
28 #define ADC_PIN_NC PIN_A1 //info, nelze menit - pin pouzit jako input analog
29 #define REF_PIN PIN_A3 //info, nelze menit - pin pouzit jako input reference 2.5V
30  
31 // interni
32 #define PowerOn() output_low(POWER_T4);output_low(POWER_T5)
33 #define PowerOff() output_high(POWER_T4);output_high(POWER_T5)
34  
35 // globalni promenne
36 struct time
37 {
38 volatile unsigned int8 hod;
39 volatile unsigned int8 min;
40 volatile unsigned int8 sec;
41 }cas;
42  
1960 kaklik 43 unsigned int top_heat_power=0; // range 0-200% nad 100% je ale teleso jiz pretizene
44 unsigned int bottom_heat_power=0; // contains heating power range 0-100%
45 unsigned int period;
46  
47 float temp_last=0;
2007 kaklik 48 float temp_slope=0;
1960 kaklik 49  
2007 kaklik 50  
1960 kaklik 51 void GeneralCpuInit() // inicializace
1861 kaklik 52 {
53 output_high(POWER_T4);
54 output_high(POWER_T5);
55 port_b_pullups(true);
56  
57 setup_psp(PSP_DISABLED);
58 setup_spi(SPI_SS_DISABLED);
59  
60 setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1); //nepouzit
1960 kaklik 61 setup_timer_1(T1_INTERNAL|T1_DIV_BY_1); // rizeni
1861 kaklik 62 setup_timer_2(T2_DIV_BY_16,249,10); //rtc 40ms
63  
64 setup_comparator(NC_NC_NC_NC);
65 setup_vref(FALSE);
66  
67 enable_interrupts(GLOBAL);
68 enable_interrupts(INT_TIMER2);
1963 kaklik 69 enable_interrupts(INT_TIMER1);
1861 kaklik 70  
71 setup_adc_ports(AN0_AN1_VSS_VREF); //A0 vstup cidla, A1 nepozit, A3 - ref. 2.5V
72 setup_adc(ADC_CLOCK_DIV_8);
73 SET_ADC_CHANNEL(0); //AN0, PIN_A0
74 }
75  
1963 kaklik 76 void heat_failure() // exception in case of heating fail
77 {
2007 kaklik 78 top_heat_power=0;
79 bottom_heat_power=0;
80  
1963 kaklik 81 lcd_gotoxy(1,2);
82 printf(lcd_putc,"HEATING FAILURE!");
83  
84 while(true);
85  
86 }
87  
2007 kaklik 88 unsigned int16 adc(void) // adc read and filtering
1861 kaklik 89 {
90 unsigned int16 analog;
91 unsigned int8 a;
92  
93 analog = 0;
94 for (a=0;a<32;a++)
95 {
96 analog += read_adc();
97 delay_us(50);
98 }
99 return (analog >> 5 ); // prumer = analog/32
100 }
101  
2007 kaklik 102 float teplota(void) // temperature measuring
1861 kaklik 103 {
2007 kaklik 104 return (0.674201*adc() - 294.35); // temperature calculaton (linear aproximation)
1861 kaklik 105 }
106  
1960 kaklik 107 void top_heating()
108 {
1963 kaklik 109 if (period < top_heat_power){
1960 kaklik 110 output_low(POWER_T4);
111 output_low(POWER_T5);
112 }
113 else{
114 output_high(POWER_T4);
115 output_high(POWER_T5);
116 }
117 }
1942 kaklik 118  
1960 kaklik 119 void bottom_heating()
120 {
121  
1963 kaklik 122 if (period < 2*bottom_heat_power){
1960 kaklik 123 output_low(POWER_T3);
124 }
125 else{
126 output_high(POWER_T3);
127 }
128  
129 }
130  
131 #int_TIMER1
132 void heating_control() //rizeni topnych teles pri preteceni casovace
133 {
2007 kaklik 134 float temp;
135  
1963 kaklik 136 top_heating();
137 bottom_heating();
2007 kaklik 138  
139 temp=teplota();
140  
141 temp_slope=(temp - temp_last)*100.0; ///(4000000.0/65536.0); // vypocet strmosti narustu teploty ve stupnich/s
142 temp_last = temp;
1960 kaklik 143  
2007 kaklik 144 if (period < 200) period++;
1963 kaklik 145 else period=0;
1960 kaklik 146 }
147  
1861 kaklik 148 #int_TIMER2
149 void Rtc(void) //40ms
150 {
151 static unsigned int8 ms40=0;
152 struct time* time;
153  
154 time=&cas;
155 if ( ++ms40 < 25) return;
156  
157 ms40=0;
158 if (++(time->sec) >= 60)
159 {
160 time->sec=0; //1min
161 if (++(time->min) >= 60)
162 {
163 time->min = 0; //1hod
164 (time->hod)++;
165 }
166 }
167 }
168  
1960 kaklik 169 void slope_control(float ramp, unsigned int balance) // P proporcionalni rizeni narustu teploty predpoklada periodicke volani 1x/s
170 {
171 float slope_deviation;
172  
2007 kaklik 173 slope_deviation = temp_slope - ramp; // vypocet strmosti a odchylky od pozadovane strmosti
1960 kaklik 174  
1963 kaklik 175 if(slope_deviation < 0)
176 {
177 top_heat_power= 80 + balance;
178 bottom_heat_power= 90;
179 }
180 else{
181 top_heat_power=0;
182 bottom_heat_power=0;
183 }
1960 kaklik 184 }
185  
186 void level_control(float level) // P proporcionalni rizeni teploty
187 {
1963 kaklik 188 if (teplota() > level)
189 {
190 top_heat_power=0;
191 bottom_heat_power=0;
192 }
193 else
194 {
195 top_heat_power=70;
196 bottom_heat_power=80;
197 }
1960 kaklik 198 }
199  
200  
1861 kaklik 201 void nullcas(struct time* time)
202 {
203 disable_interrupts(INT_TIMER2);
204  
205 time->sec=0;
206 time->hod=0;
207 time->min=0;
208  
209 enable_interrupts(INT_TIMER2);
210 }
211  
1960 kaklik 212 void reflow_solder()
1861 kaklik 213 {
1960 kaklik 214  
1963 kaklik 215 struct time process_time;
216  
1960 kaklik 217 // preheat
2007 kaklik 218  
1960 kaklik 219 nullcas(&cas);
1963 kaklik 220 lcd_gotoxy(1,2);
221 printf(lcd_putc,"PREHEAT");
1960 kaklik 222  
223 do {
224 slope_control(PREHEAT_SLOPE, 0); // hlida strmost predehrevu
225  
226 lcd_gotoxy(1,1);
227 printf(lcd_putc,"%3.1f\21C ",teplota());
228  
2007 kaklik 229 lcd_gotoxy(12,1);
230 printf(lcd_putc,"%02u:%02u",cas.min,cas.sec);
1960 kaklik 231  
2007 kaklik 232 lcd_gotoxy(10,2);
233 printf(lcd_putc,"%1.1f\21C/s ",temp_slope);
234  
1960 kaklik 235 delay_ms(1000);
1963 kaklik 236 if (cas.min>3) heat_failure();
1960 kaklik 237 }
238 while (teplota() < SOAK_TEMP);
239  
240 // soak
241 nullcas(&cas);
1963 kaklik 242 process_time.min = SOAK_TIME/60;
243 process_time.sec = SOAK_TIME - process_time.min*60;
244  
245 lcd_gotoxy(1,2);
246 printf(lcd_putc,"SOAK ");
247  
248 while (process_time.sec!=0 || process_time.min!=0)
1960 kaklik 249 {
250 level_control(SOAK_TEMP);
251  
252 lcd_gotoxy(1,1);
253 printf(lcd_putc,"%3.1f\21C ",teplota());
254  
1963 kaklik 255 if ((process_time.sec = process_time.sec - cas.sec)<0) process_time.sec=59;
256  
257 process_time.min = (SOAK_TIME - cas.min*60 - cas.sec)/60;
258 process_time.sec = (SOAK_TIME - cas.min*60 - cas.sec) - process_time.min*60;
259  
1960 kaklik 260 lcd_gotoxy(9,1);
1963 kaklik 261 printf(lcd_putc,"%2u:%02u:%02u",cas.hod, process_time.min, process_time.sec);
1960 kaklik 262 delay_ms(1000);
263 }
264  
265 // solder
266  
267 }
268  
269  
270 void main() // main loop
271 {
1861 kaklik 272 GeneralCpuInit();
273 PowerOff();
274  
275 lcd_init();
276 lcd_define_char(1,LCD_CHAR_STUPEN);
1942 kaklik 277  
1861 kaklik 278 nullcas(&cas);
279  
1942 kaklik 280 while(true)
281 {
1963 kaklik 282 delay_ms(300);
1960 kaklik 283 reflow_solder();
284  
1942 kaklik 285 }
1861 kaklik 286 }