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Add initial PoE HAT functionality

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NGnius (Graham) 2023-09-18 21:13:38 -04:00
commit d24076e804
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/target
**/target

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Cargo.toml Normal file
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[package]
name = "ng-sbc-tools"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
# project (internal)
waveshare-poe-hat = { version = "0.1", path = "./waveshare-poe-hat" }
# external
clap = { version = "4.4", features = [ "derive" ] }

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src/cli.rs Normal file
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use clap::Parser;
#[derive(Parser)]
#[command(author, version, about, long_about = None)]
pub struct Cli {
/// I2C port to use for display
pub port: u16,
}
impl Cli {
pub fn params() -> Self {
Self::parse()
}
}

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src/main.rs Normal file
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mod cli;
use waveshare_poe_hat::b::{BLACK, SSD1306, PCF8574};
fn main() {
let params = cli::Cli::params();
let mut display = SSD1306::new(params.port).expect("failed to open/init display");
let mut screen_buf = BLACK.clone();
let mut fan = PCF8574::new(params.port).expect("failed to open fan");
println!("Let's try some patterns!");
let mut pattern_count: usize = 0;
loop {
if (pattern_count >> 4) % 2 == 0 {
fan.disable().expect("Failed to disable fan");
} else {
fan.enable().expect("Failed to enable fan");
}
for pixel_i in 0..screen_buf.len() {
let cur_pixel = screen_buf[pixel_i];
screen_buf[pixel_i] = (((pixel_i ^ pattern_count) << (pattern_count % 7)) as u8) ^ cur_pixel << (pattern_count % 5) ^ cur_pixel >> (cur_pixel % 5);
//let height = pixel_i / 128;
//screen_buf[pixel_i] = (((pattern_count >> 3) % 4 == height) as u8) << (pattern_count % 8);
}
println!("Displaying pattern #{}", pattern_count);
display.image(&screen_buf).expect("Error displaying pattern");
std::thread::sleep(std::time::Duration::from_millis(100));
pattern_count += 1;
}
}

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waveshare-poe-hat/Cargo.toml Normal file
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[package]
name = "waveshare-poe-hat"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
#linux-embedded-hal = { version = "0.3" }
#embedded-hal = { version = "0.2" }
i2cdev = { version = "0.6" }

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waveshare-poe-hat/src/b/display.rs Normal file
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use i2cdev::core::I2CDevice;
use i2cdev::linux::{LinuxI2CDevice, LinuxI2CError};
const ADDRESS: u16 = 0x3C;
const SCREEN_WIDTH: u8 = 128;
const SCREEN_HEIGHT: u8 = 32;
type ScreenBuf = [u8; SCREEN_HEIGHT as usize * SCREEN_WIDTH as usize];
pub const ALL_WHITE: ScreenBuf = [0xff; SCREEN_HEIGHT as usize * SCREEN_WIDTH as usize];
pub const ALL_BLACK: ScreenBuf = [0x00; SCREEN_HEIGHT as usize * SCREEN_WIDTH as usize];
pub struct SSD1306 {
smbus: LinuxI2CDevice,
}
impl SSD1306 {
pub fn new(port: u16) -> Result<Self, LinuxI2CError> {
let smbus = LinuxI2CDevice::new(format!("/dev/i2c-{}", port), ADDRESS)?;
let mut new_self = Self { smbus };
new_self.init()?;
Ok(new_self)
}
fn command(&mut self, data: u8) -> Result<(), LinuxI2CError> {
self.smbus.smbus_write_byte_data(0x00, data)
}
fn data(&mut self, data: &[u8]) -> Result<(), LinuxI2CError> {
self.smbus.smbus_write_block_data(0x40, data)
}
fn init(&mut self) -> Result<(), LinuxI2CError> {
self.command(0xAE)?;
self.command(0x40)?; // set low column address
self.command(0xB0)?; // set high column address
// horizontal init
self.command(0xC8)?; // not offset
self.command(0x81)?;
self.command(0xff)?;
self.command(0xa1)?;
self.command(0xa6)?;
self.command(0xa8)?;
self.command(0x1f)?;
self.command(0xd3)?;
self.command(0x00)?;
self.command(0xd5)?;
self.command(0xf0)?;
self.command(0xd9)?;
self.command(0x22)?;
self.command(0xda)?;
self.command(0x02)?;
self.command(0xdb)?;
self.command(0x49)?;
self.command(0x8d)?;
self.command(0x14)?;
self.command(0xaf)?;
Ok(())
}
pub fn image(&mut self, buf: &ScreenBuf) -> Result<(), LinuxI2CError> {
for i in 0..SCREEN_HEIGHT/8 {
self.command(0xB0 + i)?; // set page address
self.command(0x00)?; // set low column address
self.command(0x10)?; // set high column address
let line = &buf[(SCREEN_WIDTH as usize * i as usize) .. (SCREEN_WIDTH as usize * (i as usize + 1))];
for chunk in line.chunks(32) {
self.data(chunk)?;
}
}
Ok(())
}
}

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waveshare-poe-hat/src/b/fan.rs Normal file
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use i2cdev::core::I2CDevice;
use i2cdev::linux::{LinuxI2CDevice, LinuxI2CError};
const ADDRESS: u16 = 0x20;
pub struct PCF8574 {
smbus: LinuxI2CDevice,
}
impl PCF8574 {
pub fn new(port: u16) -> Result<Self, LinuxI2CError> {
let smbus = LinuxI2CDevice::new(format!("/dev/i2c-{}", port), ADDRESS)?;
Ok(Self { smbus })
}
pub fn enable(&mut self) -> Result<(), LinuxI2CError> {
let read = self.smbus.smbus_read_byte()?;
self.smbus.smbus_write_byte(0xFE & read)
}
pub fn disable(&mut self) -> Result<(), LinuxI2CError> {
let read = self.smbus.smbus_read_byte()?;
self.smbus.smbus_write_byte(0x01 | read)
}
}

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waveshare-poe-hat/src/b/mod.rs Normal file
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mod display;
mod fan;
pub use display::{SSD1306, ALL_BLACK as BLACK, ALL_WHITE as WHITE};
pub use fan::PCF8574;

11
waveshare-poe-hat/src/lib.rs Normal file
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pub mod b;
#[cfg(test)]
mod tests {
//use super::*;
#[test]
fn it_works() {
assert_eq!(1+1, 2);
}
}