# TODO: Other I²C functions: general call / reset address, device ID address.
+def logic_channels(num_channels):
+ l = []
+ for i in range(num_channels):
+ l.append(tuple(['p%d' % i, 'P%d' % i]))
+ return tuple(l)
+
class Decoder(srd.Decoder):
api_version = 3
id = 'pca9571'
('value', 'Register value'),
('warning', 'Warning'),
)
+ logic_output_channels = logic_channels(NUM_OUTPUT_CHANNELS)
annotation_rows = (
('regs', 'Registers', (0, 1)),
('warnings', 'Warnings', (2,)),
self.state = 'IDLE'
self.last_write = 0xFF # Chip port default state is high.
+ 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_io(self, b):
if self.state == 'READ DATA':
operation = ['Outputs read', 'R']
self.putx([1, [operation[0] + ': %02X' % b,
operation[1] + ': %02X' % b]])
+ for i in range(NUM_OUTPUT_CHANNELS):
+ bit = (b & (1 << i)) != 0
+ self.logic_data[i] = bytes([bit])
+
def check_correct_chip(self, addr):
if addr != 0x25:
self.putx([2, ['Warning: I²C slave 0x%02X not a PCA9571 '
cmd, databyte = data
self.ss, self.es = ss, es
+ self.put_logic_states()
+
# State machine.
if cmd in ('ACK', 'BITS'): # Discard 'ACK' and 'BITS'.
pass