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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#define BUFFER_SIZE 255
#define IN_MEM (inmem!=0)
typedef struct power_data {
float power; // Power value
long ts; // Associated timestamp
long nsecs; // Associated nanosecs
} power_data;
int main(int argc, char *argv[])
{
if(argc != 4){
printf("Usage: %s <device-id> <nread> <inmem>\n\
\rFor <device-id>, see folder name in /sys/kernel/ina260/",argv[0]);
exit(1);
}
char *deviceid=argv[1];
int nread=atoi(argv[2]);
int inmem=atoi(argv[3]);
if(nread<=0){
printf("<nread> must be greater than 0\n");
exit(3);
}
// File to read
char path[255];
sprintf(path, "/sys/kernel/ina260/%s/power", deviceid);
// Open file
int fd;
char buff[BUFFER_SIZE];
fd = open(path, O_RDONLY);
if(fd<0){
perror(path);
exit(2);
}
// Check if its in memory reading
power_data *data;
if(IN_MEM){
data=malloc(sizeof(power_data)*nread);
if(data == NULL){
perror("Cannot allocate enough memory for in memory reads");
exit(4);
}
}
// Perform reads
float power=-1;
struct timespec power_ts;
clock_gettime(CLOCK_REALTIME, &power_ts);
printf("startat:%ld\n", power_ts.tv_sec);
for(int i=0;i<nread;i++){
read(fd, buff, BUFFER_SIZE);
// Get power measurement timestamp:
clock_gettime(CLOCK_REALTIME, &power_ts);
power=atof(buff);
if(IN_MEM){
data[i].power=power;
data[i].ts=power_ts.tv_sec;
data[i].nsecs=power_ts.tv_nsec;
}
else{
printf("%s %11ld %10ld> Power is %fW\n",deviceid, power_ts.tv_sec,power_ts.tv_nsec,power);
}
lseek(fd,0,SEEK_SET);
}
close(fd);
if(IN_MEM){
// We only print now (most I/O will happend at the end and this must be visible on the results)
for(int i=0;i<nread;i++){
printf("%s %11ld %10ld> Power is %fW\n",deviceid, data[i].ts, data[i].nsecs, data[i].power);
}
free(data);
}
printf("endat:%ld\n", time(NULL));
return 0;
}
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