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#!/usr/bin/nickle
import File;
string timed_read(file f, int timeout) {
thread reader = fork func() {
try {
return fgets(f);
} catch Thread::signal(int i) {
return "";
}
}();
thread killer = fork func() {
try {
sleep (timeout);
Thread::send_signal(reader, 1);
} catch Thread::signal(int i) {
return;
}
}();
poly v = Thread::join(reader);
Thread::send_signal(killer, 1);
Thread::join(killer);
if (is_string(v))
return v;
return "";
}
void flush_input(file f) {
for (;;) {
string s = timed_read(f, 200);
if (s == "")
break;
}
}
string[*] settings(file f) {
string[...] x = {};
flush_input(f);
fprintf (f, "c s\nv\n");
flush(f);
for (;;) {
string l = File::fgets(f);
x[dim(x)] = l;
if (String::index(l, "software-version") == 0)
break;
}
return x;
}
string[*] find_setting(string[*] s, string match) {
for (int i = 0; i < dim(s); i++)
if (String::index(s[i], match) == 0)
return String::split(s[i], " ");
return (string[*]) {};
}
bool
do_cal(file f) {
flush_input(f);
fprintf(f, "E 1\nc a 0\n");
flush(f);
string s = "";
bool worked = true;
bool running = false;
thread put = fork func() {
try {
for (;;) {
putc(getchar(), f);
flush(f);
}
} catch Thread::signal(int i) {
return;
}
}();
for (;;) {
int c = getc(f);
if (c == '\n')
s = "";
else
s = s + String::new(c);
putchar(c); flush(stdout);
if (String::index(s, "press a key...") >= 0)
running = true;
if (String::index(s, "Invalid") >= 0)
worked = false;
if (running && String::index(s, ">") >= 0)
break;
}
fprintf (f, "E 0\n");
if (worked)
fprintf (f, "c w\n");
sleep(200);
Thread::send_signal(put, 1);
Thread::join(put);
return worked;
}
void main () {
string name = argv[1];
file f = open(name, "r+");
if (do_cal(f)) {
string[*] s = settings(f);
string[*] ac = find_setting(s, "Accel cal");
printf ("Calibration value +1g %s -1g %s saved\n", ac[3], ac[5]);
exit (0);
} else {
printf ("Calibration failed\n");
exit (1);
}
}
main();
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