This is the list of <ptype>s and their respective <pdata> values:
- 'STARTBIT': The data is the (integer) value of the start bit (0/1).
- - 'DATA': The data is the (integer) value of the UART data. Valid values
- range from 0 to 512 (as the data can be up to 9 bits in size).
- - 'DATABITS': List of data bits and their ss/es numbers.
+ - 'DATA': This is always a tuple containing two items:
+ - 1st item: the (integer) value of the UART data. Valid values
+ range from 0 to 512 (as the data can be up to 9 bits in size).
+ - 2nd item: the list of individual data bits and their ss/es numbers.
- 'PARITYBIT': The data is the (integer) value of the parity bit (0/1).
- 'STOPBIT': The data is the (integer) value of the stop bit (0 or 1).
- 'INVALID STARTBIT': The data is the (integer) value of the start bit (0/1).
class SamplerateError(Exception):
pass
+class ChannelError(Exception):
+ pass
+
class Decoder(srd.Decoder):
api_version = 2
id = 'uart'
'values': ('lsb-first', 'msb-first')},
{'id': 'format', 'desc': 'Data format', 'default': 'ascii',
'values': ('ascii', 'dec', 'hex', 'oct', 'bin')},
- # TODO: Options to invert the signal(s).
+ {'id': 'invert_rx', 'desc': 'Invert RX?', 'default': 'no',
+ 'values': ('yes', 'no')},
+ {'id': 'invert_tx', 'desc': 'Invert TX?', 'default': 'no',
+ 'values': ('yes', 'no')},
)
annotations = (
('rx-data', 'RX data'),
self.state[rxtx] = 'GET PARITY BIT'
- self.putpx(rxtx, ['DATABITS', rxtx, self.databits[rxtx]])
- self.putpx(rxtx, ['DATA', rxtx, self.databyte[rxtx]])
+ self.putpx(rxtx, ['DATA', rxtx,
+ (self.databyte[rxtx], self.databits[rxtx])])
b, f = self.databyte[rxtx], self.options['format']
if f == 'ascii':
# continue
self.oldpins, (rx, tx) = pins, pins
+ if self.options['invert_rx'] == 'yes':
+ rx = not rx
+ if self.options['invert_tx'] == 'yes':
+ tx = not tx
+
# Either RX or TX (but not both) can be omitted.
has_pin = [rx in (0, 1), tx in (0, 1)]
if has_pin == [False, False]:
- raise Exception('Either TX or RX (or both) pins required.')
+ raise ChannelError('Either TX or RX (or both) pins required.')
# State machine.
for rxtx in (RX, TX):