74 lines
1.9 KiB
Python
74 lines
1.9 KiB
Python
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#!/usr/bin/env python
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# Copyright 2013 Jared Boone
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#
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# Interpret the LPC43xx Clock Generation Unit (CGU) FREQ_MON register
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# and display the estimated clock frequency.
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#
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# This file is part of HackRF.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2, or (at your option)
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# any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; see the file COPYING. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street,
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# Boston, MA 02110-1301, USA.
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"""
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Inside GDB:
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(gdb) set {int}0x40050014 = 0x09800000
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(gdb) x 0x40050014
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0x40050014: 0x091bd000
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This script:
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./check_clock.py 0x<register value> 0x<RCNT initial value>
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"""
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import sys
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clock_source_names = {
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0x00: '32 kHz oscillator',
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0x01: 'IRC',
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0x02: 'ENET_RX_CLK',
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0x03: 'ENET_TX_CLK',
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0x04: 'GP_CLKIN',
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0x06: 'Crystal oscillator',
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0x07: 'PLL0USB',
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0x08: 'PLL0AUDIO',
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0x09: 'PLL1',
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0x0c: 'IDIVA',
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0x0d: 'IDIVB',
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0x0e: 'IDIVC',
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0x0f: 'IDIVD',
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0x10: 'IDIVE',
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}
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reg_value = int(sys.argv[1], 16)
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rcnt = int(sys.argv[2], 16)
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print('0x%08x' % reg_value)
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rcnt_final = reg_value & 0x1ff
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fcnt = (reg_value >> 9) & 0x3fff
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clock_source = (reg_value >> 24) & 0x1f
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fref = 12e6
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if rcnt_final != 0:
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raise RuntimeError('RCNT did not reach 0')
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print('RCNT: %d' % rcnt)
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print('FCNT: %d' % fcnt)
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print('Fref: %d' % fref)
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clock_hz = fcnt / float(rcnt) * fref
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clock_mhz = clock_hz / 1e6
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clock_name = clock_source_names[clock_source] if clock_source in clock_source_names else 'Reserved'
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print('%s: %.3f MHz' % (clock_name, clock_mhz))
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