## 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, write to the Free Software
-## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+## along with this program; if not, see <http://www.gnu.org/licenses/>.
##
import sigrokdecode as srd
+from .lists import *
+
+class SamplerateError(Exception):
+ pass
class Decoder(srd.Decoder):
- api_version = 1
+ api_version = 3
id = 'ir_nec'
name = 'IR NEC'
longname = 'IR NEC'
license = 'gplv2+'
inputs = ['logic']
outputs = ['ir_nec']
- probes = [
+ channels = (
{'id': 'ir', 'name': 'IR', 'desc': 'Data line'},
- ]
- optional_probes = []
- options = {
- 'polarity': ['Polarity', 'active-low'],
- }
- annotations = [
- ['bit', 'Bit'],
- ['agc-pulse', 'AGC pulse'],
- ['longpause', 'Long pause'],
- ['shortpause', 'Short pause'],
- ['stop-bit', 'Stop bit'],
- ['leader-code', 'Leader code'],
- ['addr', 'Address'],
- ['addr-inv', 'Address#'],
- ['cmd', 'Command'],
- ['cmd-inv', 'Command#'],
- ['repeat-code', 'Repeat code'],
- ['warnings', 'Warnings'],
- ]
+ )
+ options = (
+ {'id': 'polarity', 'desc': 'Polarity', 'default': 'active-low',
+ 'values': ('active-low', 'active-high')},
+ {'id': 'cd_freq', 'desc': 'Carrier Frequency', 'default': 0},
+ )
+ annotations = (
+ ('bit', 'Bit'),
+ ('agc-pulse', 'AGC pulse'),
+ ('longpause', 'Long pause'),
+ ('shortpause', 'Short pause'),
+ ('stop-bit', 'Stop bit'),
+ ('leader-code', 'Leader code'),
+ ('addr', 'Address'),
+ ('addr-inv', 'Address#'),
+ ('cmd', 'Command'),
+ ('cmd-inv', 'Command#'),
+ ('repeat-code', 'Repeat code'),
+ ('remote', 'Remote'),
+ ('warnings', 'Warnings'),
+ )
annotation_rows = (
('bits', 'Bits', (0, 1, 2, 3, 4)),
('fields', 'Fields', (5, 6, 7, 8, 9, 10)),
- ('warnings', 'Warnings', (11,)),
+ ('remote', 'Remote', (11,)),
+ ('warnings', 'Warnings', (12,)),
)
def putx(self, data):
self.put(self.ss_other_edge, self.samplenum, self.out_ann,
[idx, [p + ' pause', '%s-pause' % p[0], '%sP' % p[0], 'P']])
- def __init__(self, **kwargs):
+ def putremote(self):
+ dev = address.get(self.addr, 'Unknown device')
+ buttons = command.get(self.addr, None)
+ if buttons is None:
+ btn = ['Unknown', 'Unk']
+ else:
+ btn = buttons.get(self.cmd, ['Unknown', 'Unk'])
+ self.put(self.ss_remote, self.ss_bit + self.stop, self.out_ann,
+ [11, ['%s: %s' % (dev, btn[0]), '%s: %s' % (dev, btn[1]),
+ '%s' % btn[1]]])
+
+ def __init__(self):
+ self.reset()
+
+ def reset(self):
self.state = 'IDLE'
- self.ss_bit = self.ss_start = self.ss_other_edge = 0
- self.data = self.count = self.active = self.old_ir = None
+ self.ss_bit = self.ss_start = self.ss_other_edge = self.ss_remote = 0
+ self.data = self.count = self.active = None
+ self.addr = self.cmd = None
def start(self):
- # self.out_python = self.register(srd.OUTPUT_PYTHON)
self.out_ann = self.register(srd.OUTPUT_ANN)
self.active = 0 if self.options['polarity'] == 'active-low' else 1
- self.old_ir = 1 if self.active == 0 else 0
def metadata(self, key, value):
if key == srd.SRD_CONF_SAMPLERATE:
self.samplerate = value
- self.margin = int(self.samplerate * 0.0001) - 1 # 0.1ms
+ self.tolerance = 0.05 # +/-5%
self.lc = int(self.samplerate * 0.0135) - 1 # 13.5ms
self.rc = int(self.samplerate * 0.01125) - 1 # 11.25ms
self.dazero = int(self.samplerate * 0.001125) - 1 # 1.125ms
self.daone = int(self.samplerate * 0.00225) - 1 # 2.25ms
self.stop = int(self.samplerate * 0.000652) - 1 # 0.652ms
+ def compare_with_tolerance(self, measured, base):
+ return (measured >= base * (1 - self.tolerance)
+ and measured <= base * (1 + self.tolerance))
+
def handle_bit(self, tick):
- ret = 0xff
- if tick in range(self.dazero - self.margin, self.dazero + self.margin):
+ ret = None
+ if self.compare_with_tolerance(tick, self.dazero):
ret = 0
- elif tick in range(self.daone - self.margin, self.daone + self.margin):
+ elif self.compare_with_tolerance(tick, self.daone):
ret = 1
- if ret < 2:
+ if ret in (0, 1):
self.putb([0, ['%d' % ret]])
- self.data = self.data * 2 + ret
+ self.data |= (ret << self.count) # LSB-first
self.count = self.count + 1
self.ss_bit = self.samplenum
def data_ok(self):
ret, name = (self.data >> 8) & (self.data & 0xff), self.state.title()
if self.count == 8:
+ if self.state == 'ADDRESS':
+ self.addr = self.data
+ if self.state == 'COMMAND':
+ self.cmd = self.data
self.putd(self.data)
self.ss_start = self.samplenum
return True
if ret == 0:
- self.putd(self.data & 0xff)
+ self.putd(self.data >> 8)
else:
- self.putx([11, ['%s error: 0x%04X' % (name, self.data)]])
+ self.putx([12, ['%s error: 0x%04X' % (name, self.data)]])
self.data = self.count = 0
self.ss_bit = self.ss_start = self.samplenum
return ret == 0
- def decode(self, ss, es, data):
- if self.samplerate is None:
- raise Exception("Cannot decode without samplerate.")
- for (self.samplenum, pins) in data:
- self.ir = pins[0]
+ def decode(self):
+ if not self.samplerate:
+ raise SamplerateError('Cannot decode without samplerate.')
+
+ cd_count = None
+ if self.options['cd_freq']:
+ cd_count = int(self.samplerate / self.options['cd_freq']) + 1
+ prev_ir = None
+
+ while True:
+ # Detect changes in the presence of an active input signal.
+ # The decoder can either be fed an already filtered RX signal
+ # or optionally can detect the presence of a carrier. Periods
+ # of inactivity (signal changes slower than the carrier freq,
+ # if specified) pass on the most recently sampled level. This
+ # approach works for filtered and unfiltered input alike, and
+ # only slightly extends the active phase of input signals with
+ # carriers included by one period of the carrier frequency.
+ # IR based communication protocols can cope with this slight
+ # inaccuracy just fine by design. Enabling carrier detection
+ # on already filtered signals will keep the length of their
+ # active period, but will shift their signal changes by one
+ # carrier period before they get passed to decoding logic.
+ if cd_count:
+ (cur_ir,) = self.wait([{0: 'e'}, {'skip': cd_count}])
+ if self.matched[0]:
+ cur_ir = self.active
+ if cur_ir == prev_ir:
+ continue
+ prev_ir = cur_ir
+ self.ir = cur_ir
+ else:
+ (self.ir,) = self.wait({0: 'e'})
- # Wait for an "interesting" edge, but also record the other ones.
- if self.old_ir == self.ir:
- continue
if self.ir != self.active:
+ # Save the non-active edge, then wait for the next edge.
self.ss_other_edge = self.samplenum
- self.old_ir = self.ir
continue
b = self.samplenum - self.ss_bit
# State machine.
if self.state == 'IDLE':
- if b in range(self.lc - self.margin, self.lc + self.margin):
+ if self.compare_with_tolerance(b, self.lc):
self.putpause('Long')
self.putx([5, ['Leader code', 'Leader', 'LC', 'L']])
+ self.ss_remote = self.ss_start
self.data = self.count = 0
self.state = 'ADDRESS'
- elif b in range(self.rc - self.margin, self.rc + self.margin):
+ elif self.compare_with_tolerance(b, self.rc):
self.putpause('Short')
self.putstop(self.samplenum)
self.samplenum += self.stop
self.state = 'STOP' if self.data_ok() else 'IDLE'
elif self.state == 'STOP':
self.putstop(self.ss_bit)
+ self.putremote()
self.ss_bit = self.ss_start = self.samplenum
self.state = 'IDLE'
- else:
- raise Exception('Invalid state: %s' % self.state)
-
- self.old_ir = self.ir
-
projects / libsigrokdecode.git / blobdiff