X-Git-Url: https://sigrok.org/gitweb/?p=libsigrokdecode.git;a=blobdiff_plain;f=decoders%2Fonewire_link%2Fpd.py;h=3974c45bf23ce4d657de0b18811c74833d007ea9;hp=51eebe84af9e749de87daa95119b136442f5c9dc;hb=4539e9ca58966ce3c9cad4801b16c315e86ace01;hpb=8e11415b6bc83e6a114223a3ece588097b0e50d9 diff --git a/decoders/onewire_link/pd.py b/decoders/onewire_link/pd.py index 51eebe8..3974c45 100644 --- a/decoders/onewire_link/pd.py +++ b/decoders/onewire_link/pd.py @@ -14,14 +14,16 @@ ## 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 . ## import sigrokdecode as srd +class SamplerateError(Exception): + pass + class Decoder(srd.Decoder): - api_version = 1 + api_version = 3 id = 'onewire_link' name = '1-Wire link layer' longname = '1-Wire serial communication bus (link layer)' @@ -29,32 +31,40 @@ class Decoder(srd.Decoder): license = 'gplv2+' inputs = ['logic'] outputs = ['onewire_link'] - probes = [ + channels = ( {'id': 'owr', 'name': 'OWR', 'desc': '1-Wire signal line'}, - ] - optional_probes = [ + ) + optional_channels = ( {'id': 'pwr', 'name': 'PWR', 'desc': '1-Wire power supply pin'}, - ] - options = { - 'overdrive': ['Overdrive mode', 'no'], + ) + options = ( + {'id': 'overdrive', + 'desc': 'Overdrive mode', 'default': 'no', 'values': ('yes', 'no')}, # Time options (specified in microseconds): - 'cnt_normal_bit': ['Normal mode sample bit time (us)', 15], - 'cnt_normal_slot': ['Normal mode data slot time (us)', 60], - 'cnt_normal_presence': ['Normal mode sample presence time (us)', 75], - 'cnt_normal_reset': ['Normal mode reset time (us)', 480], - 'cnt_overdrive_bit': ['Overdrive mode sample bit time (us)', 2], - # 'cnt_overdrive_slot': ['Overdrive mode data slot time (us)', 7.3], - 'cnt_overdrive_slot': ['Overdrive mode data slot time (us)', 7], - 'cnt_overdrive_presence': ['Overdrive mode sample presence time (us)', 10], - 'cnt_overdrive_reset': ['Overdrive mode reset time (us)', 48], - } - annotations = [ - ['bit', 'Bit'], - ['warnings', 'Warnings'], - ['reset', 'Reset'], - ['presence', 'Presence'], - ['overdrive', 'Overdrive mode notifications'], - ] + {'id': 'cnt_normal_bit', + 'desc': 'Normal mode sample bit time (μs)', 'default': 15}, + {'id': 'cnt_normal_slot', + 'desc': 'Normal mode data slot time (μs)', 'default': 60}, + {'id': 'cnt_normal_presence', + 'desc': 'Normal mode sample presence time (μs)', 'default': 75}, + {'id': 'cnt_normal_reset', + 'desc': 'Normal mode reset time (μs)', 'default': 480}, + {'id': 'cnt_overdrive_bit', + 'desc': 'Overdrive mode sample bit time (μs)', 'default': 2}, + {'id': 'cnt_overdrive_slot', + 'desc': 'Overdrive mode data slot time (μs)', 'default': 7.3}, + {'id': 'cnt_overdrive_presence', + 'desc': 'Overdrive mode sample presence time (μs)', 'default': 10}, + {'id': 'cnt_overdrive_reset', + 'desc': 'Overdrive mode reset time (μs)', 'default': 48}, + ) + annotations = ( + ('bit', 'Bit'), + ('warnings', 'Warnings'), + ('reset', 'Reset'), + ('presence', 'Presence'), + ('overdrive', 'Overdrive mode notifications'), + ) annotation_rows = ( ('bits', 'Bits', (0, 2, 3)), ('info', 'Info', (4,)), @@ -82,9 +92,8 @@ class Decoder(srd.Decoder): def putrs(self, data): self.put(self.rise, self.samplenum, self.out_ann, data) - def __init__(self, **kwargs): + def __init__(self): self.samplerate = None - self.samplenum = 0 self.state = 'WAIT FOR FALLING EDGE' self.present = 0 self.bit = 0 @@ -98,11 +107,9 @@ class Decoder(srd.Decoder): self.out_python = self.register(srd.OUTPUT_PYTHON) self.out_ann = self.register(srd.OUTPUT_ANN) - def metadata(self, key, value): - if key != srd.SRD_CONF_SAMPLERATE: - return - self.samplerate = value + self.initial_pins = [1, 1] + def checks(self): # Check if samplerate is appropriate. if self.options['overdrive'] == 'yes': if self.samplerate < 2000000: @@ -115,37 +122,10 @@ class Decoder(srd.Decoder): if self.samplerate < 400000: self.putm([1, ['Sampling rate is too low. Must be above ' + '400kHz for proper normal mode decoding.']]) - elif (self.samplerate < 1000000): + elif self.samplerate < 1000000: self.putm([1, ['Sampling rate is suggested to be above ' + '1MHz for proper normal mode decoding.']]) - # The default 1-Wire time base is 30us. This is used to calculate - # sampling times. - samplerate = float(self.samplerate) - - x = float(self.options['cnt_normal_bit']) / 1000000.0 - self.cnt_normal_bit = int(samplerate * x) - 1 - x = float(self.options['cnt_normal_slot']) / 1000000.0 - self.cnt_normal_slot = int(samplerate * x) - 1 - x = float(self.options['cnt_normal_presence']) / 1000000.0 - self.cnt_normal_presence = int(samplerate * x) - 1 - x = float(self.options['cnt_normal_reset']) / 1000000.0 - self.cnt_normal_reset = int(samplerate * x) - 1 - x = float(self.options['cnt_overdrive_bit']) / 1000000.0 - self.cnt_overdrive_bit = int(samplerate * x) - 1 - x = float(self.options['cnt_overdrive_slot']) / 1000000.0 - self.cnt_overdrive_slot = int(samplerate * x) - 1 - x = float(self.options['cnt_overdrive_presence']) / 1000000.0 - self.cnt_overdrive_presence = int(samplerate * x) - 1 - x = float(self.options['cnt_overdrive_reset']) / 1000000.0 - self.cnt_overdrive_reset = int(samplerate * x) - 1 - - # Organize values into lists. - self.cnt_bit = [self.cnt_normal_bit, self.cnt_overdrive_bit] - self.cnt_presence = [self.cnt_normal_presence, self.cnt_overdrive_presence] - self.cnt_reset = [self.cnt_normal_reset, self.cnt_overdrive_reset] - self.cnt_slot = [self.cnt_normal_slot, self.cnt_overdrive_slot] - # Check if sample times are in the allowed range. time_min = float(self.cnt_normal_bit) / self.samplerate @@ -174,33 +154,63 @@ class Decoder(srd.Decoder): if (time_min < 0.0000073) or (time_max > 0.000010): self.putm([1, ['The overdrive mode presence sample time interval ' + '(%2.1fus-%2.1fus) should be inside (7.3us, 10.0us).' - % (time_min*1000000, time_max*1000000)]]) + % (time_min * 1000000, time_max * 1000000)]]) - def decode(self, ss, es, data): - if self.samplerate is None: - raise Exception("Cannot decode without samplerate.") - for (self.samplenum, (owr, pwr)) in data: + + def metadata(self, key, value): + if key != srd.SRD_CONF_SAMPLERATE: + return + self.samplerate = value + + # The default 1-Wire time base is 30us. This is used to calculate + # sampling times. + samplerate = float(self.samplerate) + + x = float(self.options['cnt_normal_bit']) / 1000000.0 + self.cnt_normal_bit = int(samplerate * x) - 1 + x = float(self.options['cnt_normal_slot']) / 1000000.0 + self.cnt_normal_slot = int(samplerate * x) - 1 + x = float(self.options['cnt_normal_presence']) / 1000000.0 + self.cnt_normal_presence = int(samplerate * x) - 1 + x = float(self.options['cnt_normal_reset']) / 1000000.0 + self.cnt_normal_reset = int(samplerate * x) - 1 + x = float(self.options['cnt_overdrive_bit']) / 1000000.0 + self.cnt_overdrive_bit = int(samplerate * x) - 1 + x = float(self.options['cnt_overdrive_slot']) / 1000000.0 + self.cnt_overdrive_slot = int(samplerate * x) - 1 + x = float(self.options['cnt_overdrive_presence']) / 1000000.0 + self.cnt_overdrive_presence = int(samplerate * x) - 1 + x = float(self.options['cnt_overdrive_reset']) / 1000000.0 + self.cnt_overdrive_reset = int(samplerate * x) - 1 + + # Organize values into lists. + self.cnt_bit = [self.cnt_normal_bit, self.cnt_overdrive_bit] + self.cnt_presence = [self.cnt_normal_presence, self.cnt_overdrive_presence] + self.cnt_reset = [self.cnt_normal_reset, self.cnt_overdrive_reset] + self.cnt_slot = [self.cnt_normal_slot, self.cnt_overdrive_slot] + + def decode(self): + if not self.samplerate: + raise SamplerateError('Cannot decode without samplerate.') + self.checks() + while True: # State machine. if self.state == 'WAIT FOR FALLING EDGE': - # The start of a cycle is a falling edge. - if owr != 0: - continue + # The start of a cycle is a falling edge on OWR. + self.wait({0: 'f'}) # Save the sample number for the falling edge. self.fall = self.samplenum - # Go to waiting for sample time. self.state = 'WAIT FOR DATA SAMPLE' elif self.state == 'WAIT FOR DATA SAMPLE': # Sample data bit. - t = self.samplenum - self.fall - if t == self.cnt_bit[self.overdrive]: - self.bit = owr - self.state = 'WAIT FOR DATA SLOT END' + t = self.fall + self.cnt_bit[self.overdrive] + self.bit, pwr = self.wait({'skip': t - self.samplenum}) + self.state = 'WAIT FOR DATA SLOT END' elif self.state == 'WAIT FOR DATA SLOT END': # A data slot ends in a recovery period, otherwise, this is # probably a reset. - t = self.samplenum - self.fall - if t != self.cnt_slot[self.overdrive]: - continue + t = self.fall + self.cnt_slot[self.overdrive] + owr, pwr = self.wait({'skip': t - self.samplenum}) if owr == 0: # This seems to be a reset slot, wait for its end. @@ -222,8 +232,7 @@ class Decoder(srd.Decoder): self.state = 'WAIT FOR FALLING EDGE' elif self.state == 'WAIT FOR RISING EDGE': # The end of a cycle is a rising edge. - if owr != 1: - continue + self.wait({0: 'r'}) # Check if this was a reset cycle. t = self.samplenum - self.fall @@ -243,21 +252,20 @@ class Decoder(srd.Decoder): # Save the sample number for the rising edge. self.rise = self.samplenum self.putfr([2, ['Reset', 'Rst', 'R']]) - self.state = "WAIT FOR PRESENCE DETECT" + self.state = 'WAIT FOR PRESENCE DETECT' # Otherwise this is assumed to be a data bit. else: - self.state = "WAIT FOR FALLING EDGE" + self.state = 'WAIT FOR FALLING EDGE' elif self.state == 'WAIT FOR PRESENCE DETECT': # Sample presence status. - t = self.samplenum - self.rise - if t == self.cnt_presence[self.overdrive]: - self.present = owr - self.state = 'WAIT FOR RESET SLOT END' + t = self.rise + self.cnt_presence[self.overdrive] + owr, pwr = self.wait({'skip': t - self.samplenum}) + self.present = owr + self.state = 'WAIT FOR RESET SLOT END' elif self.state == 'WAIT FOR RESET SLOT END': # A reset slot ends in a long recovery period. - t = self.samplenum - self.rise - if t != self.cnt_reset[self.overdrive]: - continue + t = self.rise + self.cnt_reset[self.overdrive] + owr, pwr = self.wait({'skip': t - self.samplenum}) if owr == 0: # This seems to be a reset slot, wait for its end. @@ -270,5 +278,3 @@ class Decoder(srd.Decoder): # Wait for next slot. self.state = 'WAIT FOR FALLING EDGE' - else: - raise Exception('Invalid state: %s' % self.state)