Rev Author Line No. Line
3437 kakl 1 //*** Atomic counter up to 800 MHz ***
2 #include "acounter.h"
3 #include <string.h>
4  
5 #define LED PIN_C1 //CHANGE PIN_XX TO YOUR LED PIN NUMBER, EX: PIN_A5
6 #define SEL0 PIN_E0 // external counter division ratio
7 #define SEL1 PIN_E1 // external counter division ratio
8 #define MR PIN_E2 // external counter master reset
9 #define CLKI PIN_C0 // internal counter input
10 #define BEEP PIN_C3 // buzzer
11  
12 // LCD definitions
13 #define LCD_ENABLE_PIN PIN_D4 ////
14 #define LCD_RS_PIN PIN_D6 ////
15 #define LCD_RW_PIN PIN_D5 ////
16 #define LCD_DATA4 PIN_D0 ////
17 #define LCD_DATA5 PIN_D1 ////
18 #define LCD_DATA6 PIN_D2 ////
19 #define LCD_DATA7 PIN_D3
20 #include <lcd.c>
21  
22 int16 of=0; // count of overflow
23 int1 flag; // flag for a blinking dot
24  
3457 kaklik 25 // GPS setup for frequency measurement
26 const char cmd[40]={0xB5, 0x62, 0x06, 0x31, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x32, 0x00, 0x00, 0x00, 0x80, 0x84, 0x1E, 0x00, 0xE0, 0xC8, 0x10, 0x00, 0x40, 0x42, 0x0F, 0x00, 0xA0, 0x86, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF7, 0x00, 0x00, 0x00, 0x12, 0x03};
27  
28  
3437 kakl 29 #int_EXT // Interrupt from 1PPS
30 void EXT_isr(void)
31 {
32 unsigned int16 countH;
33 unsigned int8 countL;
34 unsigned int32 count;
35 char countS[10], a[4], b[4], c[4]; // strings for printing results
36  
37 countL=0;
38 countH=get_timer1(); // read internal counter
39 output_low(SEL0);
40 output_low(SEL1);
41 countL=input(CLKI); // read bit 0 of external counter
42 output_high(SEL0);
43 output_low(SEL1);
44 countL|=input(CLKI)<<1; // read bit 1 of external counter
45 output_low(SEL0);
46 output_high(SEL1);
47 countL|=input(CLKI)<<2; // read bit 2 of external counter
48 output_high(SEL0);
49 output_high(SEL1);
50 countL|=input(CLKI)<<3; // read bit 3 of external counter
51  
52 output_low(MR); // External counter Master Reset
53 output_high(MR);
54  
55 set_timer1(0); // Internal counter reset
56  
57 count=((unsigned int32)of<<20)+((unsigned int32)countH<<4)+(unsigned int32)countL; // concatenate
58  
59 sprintf(countS,"%09Lu", count); // engeneering values conversion
60 strncpy(a, countS, 3); a[3]='\0';
61 strncpy(b, &countS[3], 3); b[3]='\0';
62 strncpy(c, &countS[6], 3); c[3]='\0';
63  
64 printf("%s\r\n", countS); // output to RS232
65 if(flag==0){lcd_putc("\fCvak... \n"); flag=1;} else {lcd_putc("\fCvak....\n"); flag=0;};
66 printf(lcd_putc, "%s %s %s Hz\n", a, b, c); // output to LCD
67  
68 output_toggle(BEEP); // cvak...
69  
70 of=0; // reset overflow counter
71 }
72  
73 #int_TIMER1 // Interrupf from overflow
74 void TIMER1_isr(void)
75 {
76 of++;
77 }
78  
79 void main()
80 {
81  
82 setup_adc_ports(NO_ANALOGS|VSS_VDD);
83 setup_adc(ADC_CLOCK_DIV_2);
84 setup_spi(SPI_SS_DISABLED);
85 setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
86 setup_timer_1(T1_EXTERNAL|T1_DIV_BY_1);
87 setup_timer_2(T2_DISABLED,0,1);
88 setup_ccp1(CCP_OFF);
89 setup_comparator(NC_NC_NC_NC);// This device COMP currently not supported by the PICWizard
90  
3457 kaklik 91 output_toggle(BEEP); // cvak...
3437 kakl 92  
93 ext_int_edge( L_TO_H ); // set 1PPS active edge
94 enable_interrupts(INT_TIMER1);
95 enable_interrupts(INT_EXT);
96 enable_interrupts(GLOBAL);
97  
98 lcd_init();
3457 kaklik 99 delay_ms(100);
100 lcd_putc("\f ACOUNTER02A\n (c)mlab.cz 2014\n");
3437 kakl 101  
3457 kaklik 102  
103 delay_ms(1000); //wait for GPS init.
104 int n;
105 for (n=0;n<40;n++) putc(cmd[n]); // send setup to GPS
106  
3437 kakl 107 lcd_putc("\fCvak...\nHmmm...\n");
108  
109 while(true)
110 {
111 }
112  
113 }