import sigrokdecode as srd
+NUM_OUTPUT_CHANNELS = 8
+
+def logic_channels(num_channels):
+ l = []
+ for i in range(num_channels):
+ l.append(tuple(['p%d' % i, 'P-port input/output %d' % i]))
+ return tuple(l)
+
class Decoder(srd.Decoder):
- api_version = 2
+ api_version = 3
id = 'tca6408a'
name = 'TI TCA6408A'
longname = 'Texas Instruments TCA6408A'
desc = 'Texas Instruments TCA6408A 8-bit I²C I/O expander.'
license = 'gplv2+'
inputs = ['i2c']
- outputs = ['tca6408a']
+ outputs = []
+ tags = ['Embedded/industrial', 'IC']
annotations = (
('register', 'Register type'),
('value', 'Register value'),
- ('warnings', 'Warning messages'),
+ ('warning', 'Warning'),
)
+ logic_output_channels = logic_channels(NUM_OUTPUT_CHANNELS)
annotation_rows = (
('regs', 'Registers', (0, 1)),
('warnings', 'Warnings', (2,)),
)
def __init__(self):
+ self.reset()
+
+ def reset(self):
self.state = 'IDLE'
self.chip = -1
+ self.logic_es = 1
+ self.logic_data = []
+ for i in range(NUM_OUTPUT_CHANNELS):
+ self.logic_data.append(bytes([1]))
+
def start(self):
self.out_ann = self.register(srd.OUTPUT_ANN)
+ self.out_logic = self.register(srd.OUTPUT_LOGIC)
def putx(self, data):
self.put(self.ss, self.es, self.out_ann, data)
+ def put_logic_states(self):
+ if (self.es > self.logic_es):
+ for i in range(NUM_OUTPUT_CHANNELS):
+ self.put(self.logic_es, self.es, self.out_logic, [i, self.logic_data[i]])
+ self.logic_es = self.es
+
def handle_reg_0x00(self, b):
self.putx([1, ['State of inputs: %02X' % b]])
+ # TODO
def handle_reg_0x01(self, b):
- self.putx([1, ['Outputs set: %02X' % b ]])
+ self.putx([1, ['Outputs set: %02X' % b]])
+ for i in range(NUM_OUTPUT_CHANNELS):
+ bit = (b & (1 << i)) != 0
+ self.logic_data[i] = bytes([bit])
def handle_reg_0x02(self, b):
self.putx([1, ['Polarity inverted: %02X' % b]])
# Store the start/end samples of this I²C packet.
self.ss, self.es = ss, es
+ self.put_logic_states()
+
# State machine.
if self.state == 'IDLE':
# Wait for an I²C START condition.