diff options
Diffstat (limited to 'decoders/usb_signalling')
| -rw-r--r-- | decoders/usb_signalling/pd.py | 40 |
1 files changed, 31 insertions, 9 deletions
diff --git a/decoders/usb_signalling/pd.py b/decoders/usb_signalling/pd.py index e0fd291..6233c3e 100644 --- a/decoders/usb_signalling/pd.py +++ b/decoders/usb_signalling/pd.py @@ -62,11 +62,19 @@ symbols = { (0, 1): 'K', (1, 1): 'SE1', }, + 'automatic': { + # (<dp>, <dm>): <symbol/state> + (0, 0): 'SE0', + (1, 0): 'FS_J', + (0, 1): 'LS_J', + (1, 1): 'SE1', + }, } bitrates = { 'low-speed': 1500000, # 1.5Mb/s (+/- 1.5%) 'full-speed': 12000000, # 12Mb/s (+/- 0.25%) + 'automatic': None } sym_annotation = { @@ -94,7 +102,7 @@ class Decoder(srd.Decoder): ) options = ( {'id': 'signalling', 'desc': 'Signalling', - 'default': 'full-speed', 'values': ('full-speed', 'low-speed')}, + 'default': 'automatic', 'values': ('automatic', 'full-speed', 'low-speed')}, ) annotations = ( ('sym-j', 'J symbol'), @@ -137,8 +145,13 @@ class Decoder(srd.Decoder): def metadata(self, key, value): if key == srd.SRD_CONF_SAMPLERATE: self.samplerate = value - self.bitrate = bitrates[self.options['signalling']] - self.bitwidth = float(self.samplerate) / float(self.bitrate) + self.signalling = self.options['signalling'] + if self.signalling != 'automatic': + self.update_bitrate() + + def update_bitrate(self): + self.bitrate = bitrates[self.signalling] + self.bitwidth = float(self.samplerate) / float(self.bitrate) def putpx(self, data): s = self.samplenum_edge @@ -175,6 +188,7 @@ class Decoder(srd.Decoder): if sym != 'K' or self.oldsym != 'J': return self.consecutive_ones = 0 + self.update_bitrate() self.samplepos = self.samplenum - (self.bitwidth / 2) + 0.5 self.set_new_target_samplenum() self.putpx(['SOP', None]) @@ -214,7 +228,6 @@ class Decoder(srd.Decoder): self.putpm(['EOP', None]) self.putm([5, ['EOP', 'E']]) self.state = 'IDLE' - self.bitwidth = float(self.samplerate) / float(self.bitrate) else: self.putpm(['ERR', None]) self.putm([8, ['EOP Error', 'EErr', 'E']]) @@ -232,7 +245,7 @@ class Decoder(srd.Decoder): self.putpb(['SYM', sym]) self.putb(sym_annotation[sym]) if self.oldsym != sym: - edgesym = symbols[self.options['signalling']][tuple(self.edgepins)] + edgesym = symbols[self.signalling][tuple(self.edgepins)] if edgesym not in ('SE0', 'SE1'): if edgesym == sym: self.bitwidth = self.bitwidth - (0.001 * self.bitwidth) @@ -248,9 +261,17 @@ class Decoder(srd.Decoder): if se0_length > 2.5e-6: # 2.5us self.putpb(['RESET', None]) self.putb([10, ['Reset', 'Res', 'R']]) - elif se0_length > 1.2e-6 and self.options['signalling'] == 'low-speed': + self.signalling = self.options['signalling'] + elif se0_length > 1.2e-6 and self.signalling == 'low-speed': self.putpb(['KEEP ALIVE', None]) self.putb([9, ['Keep-alive', 'KA', 'A']]) + + if sym == 'FS_J': + self.signalling = 'full-speed' + self.update_bitrate() + elif sym == 'LS_J': + self.signalling = 'low-speed' + self.update_bitrate() self.state = 'IDLE' def decode(self, ss, es, data): @@ -263,7 +284,7 @@ class Decoder(srd.Decoder): if self.oldpins == pins: continue self.oldpins = pins - sym = symbols[self.options['signalling']][tuple(pins)] + sym = symbols[self.signalling][tuple(pins)] if sym == 'SE0': self.samplenum_lastedge = self.samplenum self.state = 'WAIT IDLE' @@ -276,7 +297,7 @@ class Decoder(srd.Decoder): self.edgepins = pins if self.samplenum < self.samplenum_target: continue - sym = symbols[self.options['signalling']][tuple(pins)] + sym = symbols[self.signalling][tuple(pins)] if self.state == 'GET BIT': self.get_bit(sym) elif self.state == 'GET EOP': @@ -284,10 +305,11 @@ class Decoder(srd.Decoder): elif self.state == 'WAIT IDLE': if self.oldpins == pins: continue - sym = symbols[self.options['signalling']][tuple(pins)] if self.samplenum - self.samplenum_lastedge > 1: + sym = symbols[self.options['signalling']][tuple(pins)] self.handle_idle(sym) else: + sym = symbols[self.signalling][tuple(pins)] self.wait_for_sop(sym) self.oldpins = pins self.edgepins = pins |