Expand description
Rust Library for the Microchip MCP23X17
In its current incarnation, this only supports I2C but the register map is the same for SPI as well.
Internally, the chip supports a segreggated layout of registers to make
two 8 bit GPIO ports or can interleave the registers to emulate one
16 bit GPIO port. This library works on the former layout and so disables
setting BANK
when calling set_config()
.
use linux_hal::I2cdev;
use mcp23x17::{
Mcp23x17 as Expander,
Port
};
fn main() -> Result<(), Box<Error>> {
let i2c = I2cdev::new("/dev/i2c-1")?;
let mut exp = Expander::new(i2c)?;
exp.select_port(Port::B);
exp.set_direction(0x00)?;
exp.set_data(0xff)?;
}
Implementation details taken from http://ww1.microchip.com/downloads/en/DeviceDoc/20001952C.pdf
Structs
Configuration register definition. This register is mirrored
in the register map and pertains to all ports
16bit GPIO Expander
Enums
Which port we’re actively using. Currently you must select which is
active by using select_port on
mcp23x17
. Port A is the default.Constants
Device address