Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

feat: add xl9535 support, issue #400 #403

Merged
merged 3 commits into from
Oct 3, 2024
Merged
Changes from 1 commit
Commits
File filter

Filter by extension

Filter by extension

Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
79 changes: 79 additions & 0 deletions mqtt_io/modules/gpio/xl9535.py
Original file line number Diff line number Diff line change
@@ -0,0 +1,79 @@
"""
XL9535/PCA9535/TCA9535 IO expander
"""

from typing import Optional, cast

from ...exceptions import RuntimeConfigError
from ...types import ConfigType, PinType
from . import GenericGPIO, PinDirection, PinPUD

REQUIREMENTS = ("smbus2",)
CONFIG_SCHEMA = {
"i2c_bus_num": {"type": "integer", "required": True, "empty": False},
"chip_addr": {"type": "integer", "required": True, "empty": False},
}

#XL9535_INPUT_PORT_0 = 0x00,
#XL9535_INPUT_PORT_1 = 0x01
XL9535_OUTPUT_PORT_0 = 0x02
#XL9535_OUTPUT_PORT_1 = 0x03
#XL9535_INVERSION_PORT_0 = 0x04
#XL9535_INVERSION_PORT_1 = 0x05
XL9535_CONFIG_PORT_0 = 0x06
#XL9535_CONFIG_PORT_1 = 0x07

class GPIO(GenericGPIO):
"""
Implementation of GPIO class for the XL9535/PCA9535/TCA9535 IO expander chip.

Pin numbers 0 - 15.
"""

PIN_SCHEMA = {
"pin": {"type": 'integer', "required": True, "min": 0, "max": 15},
}

def setup_module(self) -> None:
# pylint: disable=import-outside-toplevel,import-error
# pylint: disable=no-name-in-module
from smbus2 import SMBus # type: ignore

self.bus = SMBus(self.config["i2c_bus_num"])
self.address = self.config["chip_addr"]

# configure all pins as outputs
self.bus.write_word_data(self.address, XL9535_CONFIG_PORT_0, 0x0000)
# off all outputs be default
self.bus.write_word_data(self.address, XL9535_OUTPUT_PORT_0, 0x0000)

def setup_pin(
self,
pin: PinType,
direction: PinDirection,
pullup: PinPUD,
pin_config: ConfigType,
initial: Optional[str] = None,
) -> None:
# I han't found any ready-made expansion boards on sale where the chip works as an input.
# For simplicity, the implementation only supports the chip working in output mode.
if direction == PinDirection.INPUT:
raise RuntimeConfigError("Unsupported PinDirection: INPUT")
initial = pin_config.get("initial")
if initial is not None:
if initial == "high":
self.set_pin(pin, True)
elif initial == "low":
self.set_pin(pin, False)

def set_pin(self, pin: PinType, value: bool) -> None:
assert pin in range(16), "Pin number must be an integer between 0 and 15"
current_state = self.bus.read_word_data(self.address, XL9535_OUTPUT_PORT_0)
bit = 1 << cast(int, pin)
new_state = current_state | bit if value else current_state & (~bit & 0xffff)
self.bus.write_word_data(self.address, XL9535_OUTPUT_PORT_0, new_state)

def get_pin(self, pin: PinType) -> bool:
assert pin in range(16), "Pin number must be an integer between 0 and 15"
state = self.bus.read_word_data(self.address, XL9535_OUTPUT_PORT_0)
return bool(state & 1 << cast(int, pin))