X-Git-Url: http://sigrok.org/gitweb/?a=blobdiff_plain;f=decoders%2Fuart%2Fpd.py;h=7995e9979674833c56b4fd571fafccd9a1621242;hb=b5712ccbbcd023e5ac20d790bf75af3c18fc66d5;hp=8de84a4858c011bd1a696472c5056427e3d55c66;hpb=4aedd5b887ef7e34bc00c0ef76dc91ea2c443583;p=libsigrokdecode.git diff --git a/decoders/uart/pd.py b/decoders/uart/pd.py index 8de84a4..7995e99 100644 --- a/decoders/uart/pd.py +++ b/decoders/uart/pd.py @@ -19,18 +19,20 @@ ## import sigrokdecode as srd +from math import floor, ceil ''' OUTPUT_PYTHON format: -UART packet: -[, , ] +Packet: +[, , ] -This is the list of s and their respective : +This is the list of s and their respective 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). @@ -66,11 +68,15 @@ def parity_ok(parity_type, parity_bit, data, num_data_bits): return (ones % 2) == 1 elif parity_type == 'even': return (ones % 2) == 0 - else: - raise Exception('Invalid parity type: %d' % parity_type) + +class SamplerateError(Exception): + pass + +class ChannelError(Exception): + pass class Decoder(srd.Decoder): - api_version = 1 + api_version = 2 id = 'uart' name = 'UART' longname = 'Universal Asynchronous Receiver/Transmitter' @@ -78,39 +84,47 @@ class Decoder(srd.Decoder): license = 'gplv2+' inputs = ['logic'] outputs = ['uart'] - probes = [] - optional_probes = [ + optional_channels = ( # Allow specifying only one of the signals, e.g. if only one data # direction exists (or is relevant). {'id': 'rx', 'name': 'RX', 'desc': 'UART receive line'}, {'id': 'tx', 'name': 'TX', 'desc': 'UART transmit line'}, - ] - options = { - 'baudrate': ['Baud rate', 115200], - 'num_data_bits': ['Data bits', 8], # Valid: 5-9. - 'parity_type': ['Parity type', 'none'], - 'parity_check': ['Check parity?', 'yes'], # TODO: Bool supported? - 'num_stop_bits': ['Stop bit(s)', '1'], # String! 0, 0.5, 1, 1.5. - 'bit_order': ['Bit order', 'lsb-first'], - 'format': ['Data format', 'ascii'], # ascii/dec/hex/oct/bin - # TODO: Options to invert the signal(s). - } - annotations = [ - ['rx-data', 'RX data'], - ['tx-data', 'TX data'], - ['rx-start', 'RX start bits'], - ['tx-start', 'TX start bits'], - ['rx-parity-ok', 'RX parity OK bits'], - ['tx-parity-ok', 'TX parity OK bits'], - ['rx-parity-err', 'RX parity error bits'], - ['tx-parity-err', 'TX parity error bits'], - ['rx-stop', 'RX stop bits'], - ['tx-stop', 'TX stop bits'], - ['rx-warnings', 'RX warnings'], - ['tx-warnings', 'TX warnings'], - ['rx-data-bits', 'RX data bits'], - ['tx-data-bits', 'TX data bits'], - ] + ) + options = ( + {'id': 'baudrate', 'desc': 'Baud rate', 'default': 115200}, + {'id': 'num_data_bits', 'desc': 'Data bits', 'default': 8, + 'values': (5, 6, 7, 8, 9)}, + {'id': 'parity_type', 'desc': 'Parity type', 'default': 'none', + 'values': ('none', 'odd', 'even', 'zero', 'one')}, + {'id': 'parity_check', 'desc': 'Check parity?', 'default': 'yes', + 'values': ('yes', 'no')}, + {'id': 'num_stop_bits', 'desc': 'Stop bits', 'default': 1.0, + 'values': (0.0, 0.5, 1.0, 1.5)}, + {'id': 'bit_order', 'desc': 'Bit order', 'default': 'lsb-first', + 'values': ('lsb-first', 'msb-first')}, + {'id': 'format', 'desc': 'Data format', 'default': 'ascii', + 'values': ('ascii', 'dec', 'hex', 'oct', 'bin')}, + {'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'), + ('tx-data', 'TX data'), + ('rx-start', 'RX start bits'), + ('tx-start', 'TX start bits'), + ('rx-parity-ok', 'RX parity OK bits'), + ('tx-parity-ok', 'TX parity OK bits'), + ('rx-parity-err', 'RX parity error bits'), + ('tx-parity-err', 'TX parity error bits'), + ('rx-stop', 'RX stop bits'), + ('tx-stop', 'TX stop bits'), + ('rx-warnings', 'RX warnings'), + ('tx-warnings', 'TX warnings'), + ('rx-data-bits', 'RX data bits'), + ('tx-data-bits', 'TX data bits'), + ) annotation_rows = ( ('rx-data', 'RX', (0, 2, 4, 6, 8)), ('rx-data-bits', 'RX bits', (12,)), @@ -126,24 +140,24 @@ class Decoder(srd.Decoder): ) def putx(self, rxtx, data): - s, halfbit = self.startsample[rxtx], int(self.bit_width / 2) - self.put(s - halfbit, self.samplenum + halfbit, self.out_ann, data) + s, halfbit = self.startsample[rxtx], self.bit_width / 2.0 + self.put(s - floor(halfbit), self.samplenum + ceil(halfbit), self.out_ann, data) def putpx(self, rxtx, data): - s, halfbit = self.startsample[rxtx], int(self.bit_width / 2) - self.put(s - halfbit, self.samplenum + halfbit, self.out_python, data) + s, halfbit = self.startsample[rxtx], self.bit_width / 2.0 + self.put(s - floor(halfbit), self.samplenum + ceil(halfbit), self.out_python, data) def putg(self, data): - s, halfbit = self.samplenum, int(self.bit_width / 2) - self.put(s - halfbit, s + halfbit, self.out_ann, data) + s, halfbit = self.samplenum, self.bit_width / 2.0 + self.put(s - floor(halfbit), s + ceil(halfbit), self.out_ann, data) def putp(self, data): - s, halfbit = self.samplenum, int(self.bit_width / 2) - self.put(s - halfbit, s + halfbit, self.out_python, data) + s, halfbit = self.samplenum, self.bit_width / 2.0 + self.put(s - floor(halfbit), s + ceil(halfbit), self.out_python, data) def putbin(self, rxtx, data): - s, halfbit = self.startsample[rxtx], int(self.bit_width / 2) - self.put(s - halfbit, self.samplenum + halfbit, self.out_bin, data) + s, halfbit = self.startsample[rxtx], self.bit_width / 2.0 + self.put(s - floor(halfbit), self.samplenum + ceil(halfbit), self.out_bin, data) def __init__(self, **kwargs): self.samplerate = None @@ -167,7 +181,7 @@ class Decoder(srd.Decoder): def metadata(self, key, value): if key == srd.SRD_CONF_SAMPLERATE: - self.samplerate = value; + self.samplerate = value # The width of one UART bit in number of samples. self.bit_width = float(self.samplerate) / float(self.options['baudrate']) @@ -176,7 +190,9 @@ class Decoder(srd.Decoder): # bitpos is the samplenumber which is in the middle of the # specified UART bit (0 = start bit, 1..x = data, x+1 = parity bit # (if used) or the first stop bit, and so on). - bitpos = self.frame_start[rxtx] + (self.bit_width / 2.0) + # The samples within bit are 0, 1, ..., (bit_width - 1), therefore + # index of the middle sample within bit window is (bit_width - 1) / 2. + bitpos = self.frame_start[rxtx] + (self.bit_width - 1) / 2.0 bitpos += bitnum * self.bit_width if self.samplenum >= bitpos: return True @@ -234,12 +250,9 @@ class Decoder(srd.Decoder): self.databyte[rxtx] >>= 1 self.databyte[rxtx] |= \ (signal << (self.options['num_data_bits'] - 1)) - elif self.options['bit_order'] == 'msb-first': + else: self.databyte[rxtx] <<= 1 self.databyte[rxtx] |= (signal << 0) - else: - raise Exception('Invalid bit order value: %s', - self.options['bit_order']) self.putg([rxtx + 12, ['%d' % signal]]) @@ -254,8 +267,8 @@ class Decoder(srd.Decoder): 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': @@ -269,8 +282,6 @@ class Decoder(srd.Decoder): self.putx(rxtx, [rxtx, [oct(b)[2:].zfill(3)]]) elif f == 'bin': self.putx(rxtx, [rxtx, [bin(b)[2:].zfill(8)]]) - else: - raise Exception('Invalid data format option: %s' % f) self.putbin(rxtx, (rxtx, bytes([b]))) self.putbin(rxtx, (2, bytes([b]))) @@ -322,8 +333,8 @@ class Decoder(srd.Decoder): self.putg([rxtx + 4, ['Stop bit', 'Stop', 'T']]) def decode(self, ss, es, data): - if self.samplerate is None: - raise Exception("Cannot decode without samplerate.") + if not self.samplerate: + raise SamplerateError('Cannot decode without samplerate.') for (self.samplenum, pins) in data: # Note: Ignoring identical samples here for performance reasons @@ -332,10 +343,15 @@ class Decoder(srd.Decoder): # 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): @@ -355,9 +371,6 @@ class Decoder(srd.Decoder): self.get_parity_bit(rxtx, signal) elif self.state[rxtx] == 'GET STOP BITS': self.get_stop_bits(rxtx, signal) - else: - raise Exception('Invalid state: %s' % self.state[rxtx]) # Save current RX/TX values for the next round. self.oldbit[rxtx] = signal -