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ben-wpan/atrf/tools/atspi-trim/atspi-trim.c

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/*
* atspi-trim/atspi-trim.c - AF86RF230 oscillator trim utility
*
* Written 2010 by Werner Almesberger
* Copyright 2010 Werner Almesberger
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <stdlib.h>
#include <stdio.h>
#include <usb.h>
#include <sys/time.h>
#include "at86rf230.h"
#include "atspi/ep0.h"
#include "atspi.h"
static void usage(const char *name)
{
fprintf(stderr, "%s [trim_value]\n", name);
exit(1);
}
int main(int argc, const char **argv)
{
usb_dev_handle *dev;
int trim = -1;
char *end;
switch (argc) {
case 1:
break;
case 2:
trim = strtoul(argv[1], &end, 0);
if (*end || trim > 15)
usage(*argv);
break;
default:
usage(*argv);
}
dev = atspi_open();
if (!dev)
return 1;
if (trim == -1) {
trim = atspi_reg_read(dev, REG_XOSC_CTRL) & XTAL_TRIM_MASK;
printf("%d (%d.%d pF)\n", trim, trim*3/10, trim*3 % 10);
} else {
atspi_reg_write(dev, REG_XOSC_CTRL,
(XTAL_MODE_INT << XTAL_MODE_SHIFT) | trim);
}
return 0;
}