1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
#!/usr/bin/env python
# Copyright 2013 Jared Boone
#
# Interpret the LPC43xx Clock Generation Unit (CGU) FREQ_MON register
# and display the estimated clock frequency.
#
# This file is part of HackRF.
#
# 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, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
"""
Inside GDB:
(gdb) set {int}0x40050014 = 0x09800000
(gdb) x 0x40050014
0x40050014: 0x091bd000
This script:
./check_clock.py 0x<register value> 0x<RCNT initial value>
"""
import sys
clock_source_names = {
0x00: '32 kHz oscillator',
0x01: 'IRC',
0x02: 'ENET_RX_CLK',
0x03: 'ENET_TX_CLK',
0x04: 'GP_CLKIN',
0x06: 'Crystal oscillator',
0x07: 'PLL0USB',
0x08: 'PLL0AUDIO',
0x09: 'PLL1',
0x0c: 'IDIVA',
0x0d: 'IDIVB',
0x0e: 'IDIVC',
0x0f: 'IDIVD',
0x10: 'IDIVE',
}
reg_value = int(sys.argv[1], 16)
rcnt = int(sys.argv[2], 16)
print('0x%08x' % reg_value)
rcnt_final = reg_value & 0x1ff
fcnt = (reg_value >> 9) & 0x3fff
clock_source = (reg_value >> 24) & 0x1f
fref = 12e6
if rcnt_final != 0:
raise RuntimeError('RCNT did not reach 0')
print('RCNT: %d' % rcnt)
print('FCNT: %d' % fcnt)
print('Fref: %d' % fref)
clock_hz = fcnt / float(rcnt) * fref
clock_mhz = clock_hz / 1e6
clock_name = clock_source_names[clock_source] if clock_source in clock_source_names else 'Reserved'
print('%s: %.3f MHz' % (clock_name, clock_mhz))
|
