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use std::io;
use std::io::prelude::*;
use unix_socket::UnixStream;
use self::Command::*;
mod raw_cmd {
pub const NOP: u8 = 0x00;
pub const FLUSH: u8 = 0x01;
pub const ECHO: u8 = 0x02;
pub const GPIO_IN: u8 = 0x03;
pub const GPIO_HIGH: u8 = 0x04;
pub const GPIO_LOW: u8 = 0x05;
pub const GPIO_CFG: u8 = 0x06;
pub const GPIO_WAIT: u8 = 0x07;
pub const GPIO_INT: u8 = 0x08;
pub const ENABLE_SPI: u8 = 0x0A;
pub const DISABLE_SPI: u8 = 0x0B;
pub const ENABLE_I2C: u8 = 0x0C;
pub const DISABLE_I2C: u8 = 0x0D;
pub const ENABLE_UART: u8 = 0x0E;
pub const DISABLE_UART: u8 = 0x0F;
pub const TX: u8 = 0x10;
pub const RX: u8 = 0x11;
pub const TXRX: u8 = 0x12;
pub const START: u8 = 0x13;
pub const STOP: u8 = 0x14;
pub const GPIO_TOGGLE: u8 = 0x15;
pub const GPIO_INPUT: u8 = 0x16;
pub const GPIO_RAW_READ: u8 = 0x17;
pub const ANALOG_READ: u8 = 0x18;
pub const ANALOG_WRITE: u8 = 0x19;
pub const GPIO_PULL: u8 = 0x1A;
pub const PWM_DUTY_CYCLE: u8 = 0x1B;
pub const PWM_PERIOD: u8 = 0x1C;
}
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum Command<'a> {
Nop,
Flush,
GpioIn(u8),
GpioHigh(u8),
GpioLow(u8),
GpioToggle(u8),
GpioWait(u8),
GpioInt(u8),
GpioCfg(u8),
GpioInput(u8),
GpioRawRead(u8),
GpioPull(u8),
AnalogRead(u8),
AnalogWrite{ pin: u8, value: u8 },
EnableSpi{ mode: u8, freq: u8, div: u8 },
DisableSpi,
EnableI2c{ baud: u8 },
DisableI2c,
EnableUart{ baud: u8, mode: u8 },
DisableUart,
Start(u8),
Stop,
PwmDutyCycle{ pin: u8, duty_cycle: u16 },
PwmPeriod{ prescalar: u8, tcc_id: u8, period: u16 },
Rx(u8),
Echo(&'a [u8]),
Tx(&'a [u8]),
TxRx(&'a [u8]),
}
pub mod reply {
pub struct Reply(pub u8);
pub const ACK: Reply = Reply(0x80);
pub const NACK: Reply = Reply(0x81);
pub const HIGH: Reply = Reply(0x82);
pub const LOW: Reply = Reply(0x83);
pub const DATA: Reply = Reply(0x84);
pub const MIN_ASYNC: Reply = Reply(0xA0);
pub const ASYNC_PIN_CHANGE_N: Reply = Reply(0xC0);
pub const ASYNC_UART_RX: Reply = Reply(0xD0);
}
pub struct PortSocket {
_socket_path: String,
socket: UnixStream,
}
impl PortSocket {
pub fn new(path: &str) -> PortSocket {
let socket = UnixStream::connect(path).unwrap();
PortSocket {
_socket_path: path.to_string(),
socket: socket
}
}
pub fn raw_write(&mut self, buffer: &[u8]) -> io::Result<()> {
self.socket.write_all(buffer)
}
pub fn write_command(&mut self, cmd: Command) -> io::Result<()> {
let socket = &mut self.socket;
match cmd {
Nop => socket.write_all(&[raw_cmd::NOP]),
Flush => socket.write_all(&[raw_cmd::FLUSH]),
Rx(len) => socket.write_all(&[raw_cmd::RX, len]),
Echo(data) => {
assert!(data.len() <= u8::max_value() as usize);
try!(socket.write_all(&[raw_cmd::ECHO, data.len() as u8]));
socket.write_all(data)
},
Tx(data) => {
for slice in data.chunks(u8::max_value() as usize) {
try!(socket.write_all(&[raw_cmd::TX, slice.len() as u8]));
try!(socket.write_all(slice));
}
Ok(())
}
TxRx(data) => {
assert!(data.len() <= u8::max_value() as usize);
try!(socket.write_all(&[raw_cmd::TXRX, data.len() as u8]));
socket.write_all(data)
}
GpioIn(pin) => socket.write_all(&[raw_cmd::GPIO_IN, pin]),
GpioHigh(pin) => socket.write_all(&[raw_cmd::GPIO_HIGH, pin]),
GpioLow(pin) => socket.write_all(&[raw_cmd::GPIO_LOW, pin]),
GpioToggle(pin) => socket.write_all(&[raw_cmd::GPIO_TOGGLE, pin]),
GpioWait(pin) => socket.write_all(&[raw_cmd::GPIO_WAIT, pin]),
GpioInt(pin) => socket.write_all(&[raw_cmd::GPIO_INT, pin]),
GpioCfg(pin) => socket.write_all(&[raw_cmd::GPIO_CFG, pin]),
GpioInput(pin) => socket.write_all(&[raw_cmd::GPIO_INPUT, pin]),
GpioRawRead(pin) => socket.write_all(&[raw_cmd::GPIO_RAW_READ, pin]),
GpioPull(pin) => socket.write_all(&[raw_cmd::GPIO_PULL, pin]),
AnalogRead(pin) => socket.write_all(&[raw_cmd::ANALOG_READ, pin]),
AnalogWrite{ pin, value } => socket.write_all(&[raw_cmd::ANALOG_WRITE, pin, value]),
EnableSpi{ mode, freq, div } => socket.write_all(&[raw_cmd::ENABLE_SPI, mode, freq, div]),
DisableSpi => socket.write_all(&[raw_cmd::DISABLE_SPI]),
EnableI2c{ baud } => socket.write_all(&[raw_cmd::ENABLE_I2C, baud]),
DisableI2c => socket.write_all(&[raw_cmd::DISABLE_I2C]),
EnableUart{ baud, mode } => socket.write_all(&[raw_cmd::ENABLE_UART, baud, mode]),
DisableUart => socket.write_all(&[raw_cmd::DISABLE_UART]),
Start(addr) => socket.write_all(&[raw_cmd::START, addr]),
Stop => socket.write_all(&[raw_cmd::STOP]),
PwmDutyCycle{ pin, duty_cycle } => socket.write_all(&[raw_cmd::PWM_DUTY_CYCLE, pin, (duty_cycle >> 8) as u8, (duty_cycle & 0xFF) as u8]),
PwmPeriod{ prescalar, tcc_id, period } => socket.write_all(&[raw_cmd::PWM_PERIOD, prescalar << 4 | tcc_id & 0x7, (period >> 8) as u8, (period & 0xf) as u8]),
}
}
pub fn read_exact(&mut self, buffer: &mut [u8]) -> io::Result<()> {
self.socket.read_exact(buffer)
}
}