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test_peripherals_i2c.py
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373 lines (296 loc) · 8.78 KB
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from unittest.mock import Mock, call as H_interface
import pytest
from PSL import commands_proto as CP
from PSL.Peripherals import I2CMaster, I2CSlave
from PSL.packet_handler import Handler
ADDRESS = 0x52
REGISTER_ADDRESS = 0x06
class MockHandler(Handler):
def connect(
self,
port: str = None,
baudrate: int = 1000000,
timeout: float = 1.0,
):
pass
@staticmethod
def _check_udev():
pass
@pytest.fixture
def handler():
mock_handler = MockHandler()
mock_handler.interface = Mock()
mock_handler.interface.read.return_value = CP.ACKNOWLEDGE
mock_handler.interface.write.return_value = None
return mock_handler
@pytest.fixture
def master(handler):
return I2CMaster(handler)
@pytest.fixture
def slave(handler):
return I2CSlave(handler, ADDRESS)
class Response:
def __init__(self, interface, responses, default):
self.interface = interface # mocked
self.responses = responses
self.default = default
def __call__(self, request):
if request in self.responses:
self.interface.read.return_value = self.responses[request]
else:
self.interface.read.return_value = self.default
CONFIG = list(
map(
H_interface.write,
[
CP.I2C_HEADER,
CP.I2C_CONFIG,
],
)
)
ACK = [H_interface.read(1)]
def test_config_frequency(master):
MAX_BRGVAL = master.MAX_BRGVAL
# <= MAX_BRGVAL
BRGVAL = MAX_BRGVAL - 1
freq = round(1.0 / ((BRGVAL + 1.0) / 64e6 + 1.0 / 1e7))
master.config(freq, verbose=True)
calls = CONFIG + [H_interface.write(CP.ShortInt.pack(BRGVAL))] + ACK
assert master.H.interface.method_calls == calls
def test_config_low_frequency(master, capsys):
MAX_BRGVAL = master.MAX_BRGVAL
# > MAX_BRGVAL
BRGVAL = MAX_BRGVAL + 1
freq = round(1.0 / ((BRGVAL + 1.0) / 64e6 + 1.0 / 1e7))
master.config(freq, verbose=True)
calls = CONFIG + [H_interface.write(CP.ShortInt.pack(MAX_BRGVAL))] + ACK
assert master.H.interface.method_calls == calls
captured = capsys.readouterr()
assert (
captured.out
== f"Frequency too low. Setting to : {1/((MAX_BRGVAL+1.0)/64e6+1.0/1e7)}\n"
)
def test_scan(master):
address = CP.Byte.pack(((ADDRESS << 1) | 0) & 0xFF)
interface = master.H.interface
success = CP.Byte.pack(1)
responses = {address: success}
interface.write.side_effect = Response(interface, responses, CP.ACKNOWLEDGE)
assert master.scan() == [ADDRESS]
START_READ = list(
map(
H_interface.write,
[
CP.I2C_HEADER,
CP.I2C_START,
CP.Byte.pack(((ADDRESS << 1) | 1) & 0xFF),
],
)
)
START_WRITE = list(
map(
H_interface.write,
[
CP.I2C_HEADER,
CP.I2C_START,
CP.Byte.pack(((ADDRESS << 1) | 0) & 0xFF),
],
)
)
STOP = list(
map(
H_interface.write,
[
CP.I2C_HEADER,
CP.I2C_STOP,
],
)
)
SEND = list(
map(
H_interface.write,
[
CP.I2C_HEADER,
CP.I2C_SEND,
],
)
)
SEND_BURST = list(
map(
H_interface.write,
[
CP.I2C_HEADER,
CP.I2C_SEND_BURST,
],
)
)
RESTART_READ = list(
map(
H_interface.write,
[
CP.I2C_HEADER,
CP.I2C_RESTART,
CP.Byte.pack(((ADDRESS << 1) | 1) & 0xFF),
],
)
)
RESTART_WRITE = list(
map(
H_interface.write,
[
CP.I2C_HEADER,
CP.I2C_RESTART,
CP.Byte.pack(((ADDRESS << 1) | 0) & 0xFF),
],
)
)
READ_MORE = list(
map(
H_interface.write,
[
CP.I2C_HEADER,
CP.I2C_READ_MORE,
],
)
)
READ_END = list(
map(
H_interface.write,
[
CP.I2C_HEADER,
CP.I2C_READ_END,
],
)
)
READ_BULK = list(
map(
H_interface.write,
[
CP.I2C_HEADER,
CP.I2C_READ_BULK,
CP.Byte.pack(ADDRESS),
CP.Byte.pack(REGISTER_ADDRESS),
],
)
)
WRITE_BULK = list(
map(
H_interface.write,
[
CP.I2C_HEADER,
CP.I2C_WRITE_BULK,
CP.Byte.pack(ADDRESS),
],
)
)
CAPTURE_START = list(
map(
H_interface.write,
[
CP.I2C_HEADER,
CP.I2C_START_SCOPE,
CP.Byte.pack(ADDRESS),
CP.Byte.pack(REGISTER_ADDRESS),
],
)
)
def test_send(slave):
slave.start(0)
slave.send(0xFF)
slave.stop()
calls = START_WRITE + ACK
calls += SEND + [H_interface.write(CP.Byte.pack(0xFF))] + ACK
calls += STOP + ACK
assert slave.H.interface.method_calls == calls
def test_send_burst(slave):
slave.start(0)
slave.send_burst(0xFF)
slave.stop()
calls = START_WRITE + ACK
calls += SEND_BURST + [H_interface.write(CP.Byte.pack(0xFF))]
calls += STOP + ACK
assert slave.H.interface.method_calls == calls
def test_restart(slave):
slave.start(1)
slave.restart(0)
slave.stop()
calls = START_READ + ACK
calls += RESTART_WRITE + ACK
calls += STOP + ACK
assert slave.H.interface.method_calls == calls
def test_read(slave):
slave.start(1)
bytes_read = [CP.ACKNOWLEDGE] * 4 * 2
bytes_read[::2] = [b"d", b"a", b"t", b"a"]
slave.H.interface.read.side_effect = bytes_read + [CP.ACKNOWLEDGE]
assert slave.read(4) == list(b"data")
slave.stop()
calls = START_READ + ACK
calls += (READ_MORE + [H_interface.read(1)] + ACK) * 3
calls += READ_END + [H_interface.read(1)] + ACK
calls += STOP + ACK
assert slave.H.interface.method_calls == calls
def test_simple_read(slave):
bytes_read = [CP.ACKNOWLEDGE] * 4 * 2
bytes_read[::2] = [b"d", b"a", b"t", b"a"]
slave.H.interface.read.side_effect = [CP.ACKNOWLEDGE] + bytes_read
assert slave.simple_read(4) == list(b"data")
calls = START_READ + ACK
calls += (READ_MORE + [H_interface.read(1)] + ACK) * 3
calls += READ_END + [H_interface.read(1)] + ACK
assert slave.H.interface.method_calls == calls
def test_simple_read_byte(slave):
bytes_read = [b"\xFF", CP.ACKNOWLEDGE]
slave.H.interface.read.side_effect = [CP.ACKNOWLEDGE] + bytes_read
assert slave.simple_read_byte() == 0xFF
calls = START_READ + ACK
calls += READ_END + [H_interface.read(1)] + ACK
assert slave.H.interface.method_calls == calls
def test_simple_read_int(slave):
bytes_read = [b"\xFF", CP.ACKNOWLEDGE] * 2
slave.H.interface.read.side_effect = [CP.ACKNOWLEDGE] + bytes_read
assert slave.simple_read_int() == 0xFFFF
calls = START_READ + ACK
calls += (READ_MORE + [H_interface.read(1)] + ACK) * 1
calls += READ_END + [H_interface.read(1)] + ACK
assert slave.H.interface.method_calls == calls
def test_simple_read_long(slave):
bytes_read = [b"\xFF", CP.ACKNOWLEDGE] * 4
slave.H.interface.read.side_effect = [CP.ACKNOWLEDGE] + bytes_read
assert slave.simple_read_long() == 0xFFFFFFFF
calls = START_READ + ACK
calls += (READ_MORE + [H_interface.read(1)] + ACK) * 3
calls += READ_END + [H_interface.read(1)] + ACK
assert slave.H.interface.method_calls == calls
def test_read_bulk(slave):
slave.H.interface.read.side_effect = [b"data", CP.ACKNOWLEDGE]
assert slave.read_bulk(REGISTER_ADDRESS, 4) == list(b"data")
calls = READ_BULK + [H_interface.write(CP.Byte.pack(4))]
calls += [H_interface.read(4)] + ACK
assert slave.H.interface.method_calls == calls
def test_read_bulk_byte(slave):
slave.H.interface.read.side_effect = [b"\xFF", CP.ACKNOWLEDGE]
assert slave.read_bulk_byte(REGISTER_ADDRESS) == 0xFF
calls = READ_BULK + [H_interface.write(CP.Byte.pack(1))]
calls += [H_interface.read(1)] + ACK
assert slave.H.interface.method_calls == calls
def test_read_bulk_int(slave):
slave.H.interface.read.side_effect = [b"\xFF" * 2, CP.ACKNOWLEDGE]
assert slave.read_bulk_int(REGISTER_ADDRESS) == 0xFFFF
calls = READ_BULK + [H_interface.write(CP.Byte.pack(2))]
calls += [H_interface.read(2)] + ACK
assert slave.H.interface.method_calls == calls
def test_read_bulk_long(slave):
slave.H.interface.read.side_effect = [b"\xFF" * 4, CP.ACKNOWLEDGE]
assert slave.read_bulk_long(REGISTER_ADDRESS) == 0xFFFFFFFF
calls = READ_BULK + [H_interface.write(CP.Byte.pack(4))]
calls += [H_interface.read(4)] + ACK
assert slave.H.interface.method_calls == calls
def test_write_bulk(slave):
slave.write_bulk(b"data")
calls = WRITE_BULK + [H_interface.write(CP.Byte.pack(4))]
calls += list(map(H_interface.write, [b"d", b"a", b"t", b"a"]))
calls += ACK
assert slave.H.interface.method_calls == calls
def test_capture(slave):
pass # TODO