78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
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#include <detpic32.h>
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#define SAMPLES 4
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const unsigned int dis7Scodes[] = {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D,
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0xFD, 0x07, 0x7F, 0x6F, 0x77, 0xFC,
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0x39, 0x5E, 0xF9, 0xF1};
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typedef enum { HIGH, LOW } flag;
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unsigned char toBdc(unsigned char value) {
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return ((value / 10) << 4) + (value % 10);
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}
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void send2displays(unsigned char value) {
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static flag f = LOW;
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value = toBdc(value);
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unsigned char high = dis7Scodes[value >> 4];
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unsigned char low = dis7Scodes[value & 0x0F];
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if (f == HIGH) {
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LATD = (LATD & 0xFF9F) | 0x0040;
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LATB = (LATB & 0x80FF) | high << 8;
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f = LOW;
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} else {
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LATD = (LATD & 0xFF9F) | 0x0020;
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LATB = (LATB & 0x80FF) | low << 8;
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f = HIGH;
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}
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}
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void delay(unsigned int ms) {
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resetCoreTimer();
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while (readCoreTimer() < ms * 20000);
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}
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int main() {
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TRISBbits.TRISB4 = 1; // RB4 digital output disconnected
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AD1PCFGbits.PCFG4 = 0; // RB4 configured as analog input (AN4)
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AD1CON1bits.SSRC = 7; // Conversion trigger selection bits: in this
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// mode an internal counter ends sampling and
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// starts conversion
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AD1CON1bits.CLRASAM = 1; // Stop conversions when the 1st A/D converter
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// interrupt is generated. At the same time, hardware
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// clears the ASAM bit
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AD1CON3bits.SAMC = 16; // Sample time is 16 TAD (TAD = 100 ns)
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AD1CON2bits.SMPI = SAMPLES - 1; // Interrupt is generated after 16 samples
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AD1CHSbits.CH0SA = 4; // Selects AN4 as input for the A/D converter
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AD1CON1bits.ON = 1; // Enable A/D converter
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TRISB &= 0x80FF; // Configure RB8-RB14 as outputs
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TRISD &= 0xFF9F; // Configure RD5-RD6 as outputs
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int i = 0;
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int v = 0;
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while (1) {
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if (i == 0){
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AD1CON1bits.ASAM = 1; // Start conversion
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while (IFS1bits.AD1IF == 0); // Wait while conversion not done
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int total = 0;
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int *p = (int *)(&ADC1BUF0);
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for (; p <= (int *)(&ADC1BUFF); p+=4)
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total += *p;
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int val_ad = total / SAMPLES;
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v = (val_ad * 33 + 511) / 1023;
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}
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send2displays(v);
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delay(10);
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i = (i + 1) % 20;
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IFS1bits.AD1IF = 0; // Reset AD1IF
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}
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return 0;
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}
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