diff options
Diffstat (limited to 'decoders/ddc.py')
| -rw-r--r-- | decoders/ddc.py | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/decoders/ddc.py b/decoders/ddc.py index 36d5c4a..4b6cf6a 100644 --- a/decoders/ddc.py +++ b/decoders/ddc.py @@ -23,22 +23,24 @@ # This decoder extracts a DDC stream from an I2C session between a computer # and a display device. The stream is output as plain bytes. # +# Details: +# https://en.wikipedia.org/wiki/Display_Data_Channel +# import sigrokdecode as srd - class Decoder(srd.Decoder): id = 'ddc' name = 'DDC' longname = 'Display Data Channel' - desc = 'DDC is a protocol for communication between computers and displays.' + desc = 'A protocol for communication between computers and displays.' longdesc = '' author = 'Bert Vermeulen <bert@biot.com>' license = 'gplv3+' inputs = ['i2c'] outputs = ['ddc'] annotations = [ - ["Byte stream", "DDC byte stream as read from display."], + ['Byte stream', 'DDC byte stream as read from display.'], ] def __init__(self, **kwargs): @@ -51,10 +53,10 @@ class Decoder(srd.Decoder): try: cmd, data, ack_bit = i2c_data except Exception as e: - raise Exception("malformed I2C input: %s" % str(e)) from e + raise Exception('malformed I2C input: %s' % str(e)) from e if self.state is None: - # waiting for the DDC session to start + # Wait for the DDC session to start. if cmd in ('START', 'START_REPEAT'): self.state = 'start' elif self.state == 'start': @@ -63,12 +65,12 @@ class Decoder(srd.Decoder): # so this marks the start of the DDC data transfer. self.state = 'transfer' elif cmd == 'STOP': - # back to idle + # Got back to the idle state. self.state = None elif self.state == 'transfer': if cmd == 'DATA_READ': - # there shouldn't be anything but data reads on this - # address, so ignore everything else + # There shouldn't be anything but data reads on this + # address, so ignore everything else. self.put(start_sample, end_sample, self.out_ann, - [0, ["0x%.2x" % data]]) + [0, ['0x%.2x' % data]]) |