1 files changed, 88 insertions, 0 deletions
diff --git a/sandbox/pure-read/read.c b/sandbox/pure-read/read.c
new file mode 100644
index 0000000..539933d
--- /dev/null
+++ b/sandbox/pure-read/read.c
@@ -0,0 +1,88 @@
+#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;
+}