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59 lines
1.2 KiB
C
59 lines
1.2 KiB
C
2 months ago
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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// Path to the raw adc's values:
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#define ADC_PATH "/sys/bus/iio/devices/iio:device0/in_voltage%d_raw"
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// Prototype Functions:
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// 1 Function to read ADC value from a given channel (0 to 6)
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int ReadADC(int channel);
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// main:
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int main( ) {
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printf("Starting ADC program\n");
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int channel = 0; // select the channel 0 - 6
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int adcVal = ReadADC(channel);
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if (adcVal >= 0) {
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printf("ADC Channel %d raw value: %d\n", channel, adcVal);
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} else {
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printf("Failed to read ADC value\n");
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}
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return 0;
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}
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int ReadADC(int channel) {
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char filePath[64];
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char buffer[16];
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int fd, adcValue;
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// file path to adc
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snprintf(filePath, sizeof(filePath), ADC_PATH, channel);
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//printf(filePath);
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// open the ADC file
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fd = open(filePath, O_RDONLY);
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if (fd < 0){
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perror("Unable to open ADC Path");
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return -1;
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}
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// read ADC value
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if (read(fd, buffer, sizeof(buffer)) < 0) {
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perror("Unable to read ADC value");
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close(fd);
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return -1;
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}
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// converting string to int
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adcValue = atoi(buffer);
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close(fd);
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return adcValue;
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}
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