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##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2015 Karl Palsson <karlp@tweak.net.au>
##
## 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.
##
## 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; if not, see <http://www.gnu.org/licenses/>.
##
import sigrokdecode as srd
regs = {
0: 'Product_ID',
1: 'Revision_ID',
2: 'Motion',
3: 'Delta_X',
4: 'Delta_Y',
5: 'SQUAL',
6: 'Shutter_Upper',
7: 'Shutter_Lower',
8: 'Maximum_Pixel',
9: 'Pixel_Sum',
0xa: 'Minimum_Pixel',
0xb: 'Pixel_Grab',
0xd: 'Mouse_Control',
0x3a: 'Chip_Reset',
0x3f: 'Inv_Rev_ID',
0x63: 'Motion_Burst',
}
class Decoder(srd.Decoder):
api_version = 3
id = 'adns5020'
name = 'ADNS-5020'
longname = 'Avago ADNS-5020 optical mouse sensor'
desc = 'Bidirectional command and data over an SPI-like protocol.'
license = 'gplv2+'
inputs = ['spi']
outputs = ['adns5020']
annotations = (
('read', 'Register read commands'),
('write', 'Register write commands'),
('warning', 'Warnings'),
)
annotation_rows = (
('read', 'Read', (0,)),
('write', 'Write', (1,)),
('warnings', 'Warnings', (2,)),
)
def __init__(self):
self.reset()
def reset(self):
self.ss_cmd, self.es_cmd = 0, 0
self.mosi_bytes = []
def start(self):
self.out_ann = self.register(srd.OUTPUT_ANN)
def putx(self, data):
self.put(self.ss_cmd, self.es_cmd, self.out_ann, data)
def put_warn(self, pos, msg):
self.put(pos[0], pos[1], self.out_ann, [2, [msg]])
def decode(self, ss, es, data):
ptype = data[0]
if ptype == 'CS-CHANGE':
# If we transition high mid-stream, toss out our data and restart.
cs_old, cs_new = data[1:]
if cs_old is not None and cs_old == 0 and cs_new == 1:
if len(self.mosi_bytes) not in [0, 2]:
self.put_warn([self.ss_cmd, es], 'Misplaced CS#!')
self.mosi_bytes = []
return
# Don't care about anything else.
if ptype != 'DATA':
return
mosi, miso = data[1:]
self.ss, self.es = ss, es
if len(self.mosi_bytes) == 0:
self.ss_cmd = ss
self.mosi_bytes.append(mosi)
# Writes/reads are mostly two transfers (burst mode is different).
if len(self.mosi_bytes) != 2:
return
self.es_cmd = es
cmd, arg = self.mosi_bytes
write = cmd & 0x80
reg = cmd & 0x7f
reg_desc = regs.get(reg, 'Reserved %#x' % reg)
if reg > 0x63:
reg_desc = 'Unknown'
if write:
self.putx([1, ['%s: %#x' % (reg_desc, arg)]])
else:
self.putx([0, ['%s: %d' % (reg_desc, arg)]])
self.mosi_bytes = []
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