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#![no_main]
#![no_std]
extern crate cortex_m;
extern crate cortex_m_rt;
extern crate embedded_hal;
extern crate panic_halt;
extern crate stm32f0xx_hal as hal;
use hal::i2c::*;
use hal::prelude::*;
use hal::stm32;
use cortex_m_rt::entry;
use embedded_hal::blocking::i2c::Write;
const SSD1306_BYTE_CMD: u8 = 0x00;
const SSD1306_BYTE_DATA: u8 = 0x40;
const SSD1306_BYTE_CMD_SINGLE: u8 = 0x80;
const SSD1306_DISPLAY_RAM: u8 = 0xA4;
const SSD1306_DISPLAY_NORMAL: u8 = 0xA6;
const SSD1306_DISPLAY_OFF: u8 = 0xAE;
const SSD1306_DISPLAY_ON: u8 = 0xAF;
const SSD1306_MEMORY_ADDR_MODE: u8 = 0x20;
const SSD1306_COLUMN_RANGE: u8 = 0x21;
const SSD1306_PAGE_RANGE: u8 = 0x22;
const SSD1306_DISPLAY_START_LINE: u8 = 0x40;
const SSD1306_SCAN_MODE_NORMAL: u8 = 0xC0;
const SSD1306_DISPLAY_OFFSET: u8 = 0xD3;
const SSD1306_PIN_MAP: u8 = 0xDA;
const SSD1306_DISPLAY_CLK_DIV: u8 = 0xD5;
const SSD1306_CHARGE_PUMP: u8 = 0x8D;
#[entry]
fn main() -> ! {
if let Some(p) = stm32::Peripherals::take() {
let gpiof = p.GPIOF.split();
let mut rcc = p.RCC.constrain();
let _ = rcc.cfgr.freeze();
let scl = gpiof
.pf1
.into_alternate_af1()
.internal_pull_up(true)
.set_open_drain();
let sda = gpiof
.pf0
.into_alternate_af1()
.internal_pull_up(true)
.set_open_drain();
/* Setup I2C1 */
let mut i2c = I2c::i2c1(p.I2C1, (scl, sda), 400.khz());
/* Initialise SSD1306 display */
let _ = ssd1306_init(&mut i2c);
/* Print a welcome message on the display */
let _ = ssd1306_pos(&mut i2c, 0, 0);
/* Endless loop */
loop {
for c in 97..123 {
let _ = ssd1306_print_bytes(&mut i2c, &[c]);
}
for c in 65..91 {
let _ = ssd1306_print_bytes(&mut i2c, &[c]);
}
}
}
loop {
continue;
}
}
/// Print characters on the display with the embedded 7x7 font
fn ssd1306_print_bytes<I2C, E>(i2c: &mut I2C, bytes: &[u8]) -> Result<(), E>
where
I2C: Write<Error = E>,
{
/* A 7x7 font shamelessly borrowed from https://github.com/techninja/MarioChron/ */
const FONT_7X7: [u8; 672] = [
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // (space)
0x00, 0x00, 0x5F, 0x00, 0x00, 0x00, 0x00, // !
0x00, 0x07, 0x00, 0x07, 0x00, 0x00, 0x00, // "
0x14, 0x7F, 0x14, 0x7F, 0x14, 0x00, 0x00, // #
0x24, 0x2A, 0x7F, 0x2A, 0x12, 0x00, 0x00, // $
0x23, 0x13, 0x08, 0x64, 0x62, 0x00, 0x00, // %
0x36, 0x49, 0x55, 0x22, 0x50, 0x00, 0x00, // &
0x00, 0x05, 0x03, 0x00, 0x00, 0x00, 0x00, // '
0x00, 0x1C, 0x22, 0x41, 0x00, 0x00, 0x00, // (
0x00, 0x41, 0x22, 0x1C, 0x00, 0x00, 0x00, // )
0x08, 0x2A, 0x1C, 0x2A, 0x08, 0x00, 0x00, // *
0x08, 0x08, 0x3E, 0x08, 0x08, 0x00, 0x00, // +
0x00, 0x50, 0x30, 0x00, 0x00, 0x00, 0x00, // ,
0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00, // -
0x00, 0x60, 0x60, 0x00, 0x00, 0x00, 0x00, // .
0x20, 0x10, 0x08, 0x04, 0x02, 0x00, 0x00, // /
0x1C, 0x3E, 0x61, 0x41, 0x43, 0x3E, 0x1C, // 0
0x40, 0x42, 0x7F, 0x7F, 0x40, 0x40, 0x00, // 1
0x62, 0x73, 0x79, 0x59, 0x5D, 0x4F, 0x46, // 2
0x20, 0x61, 0x49, 0x4D, 0x4F, 0x7B, 0x31, // 3
0x18, 0x1C, 0x16, 0x13, 0x7F, 0x7F, 0x10, // 4
0x27, 0x67, 0x45, 0x45, 0x45, 0x7D, 0x38, // 5
0x3C, 0x7E, 0x4B, 0x49, 0x49, 0x79, 0x30, // 6
0x03, 0x03, 0x71, 0x79, 0x0D, 0x07, 0x03, // 7
0x36, 0x7F, 0x49, 0x49, 0x49, 0x7F, 0x36, // 8
0x06, 0x4F, 0x49, 0x49, 0x69, 0x3F, 0x1E, // 9
0x00, 0x36, 0x36, 0x00, 0x00, 0x00, 0x00, // :
0x00, 0x56, 0x36, 0x00, 0x00, 0x00, 0x00, // ;
0x00, 0x08, 0x14, 0x22, 0x41, 0x00, 0x00, // <
0x14, 0x14, 0x14, 0x14, 0x14, 0x00, 0x00, // =
0x41, 0x22, 0x14, 0x08, 0x00, 0x00, 0x00, // >
0x02, 0x01, 0x51, 0x09, 0x06, 0x00, 0x00, // ?
0x32, 0x49, 0x79, 0x41, 0x3E, 0x00, 0x00, // @
0x7E, 0x11, 0x11, 0x11, 0x7E, 0x00, 0x00, // A
0x7F, 0x49, 0x49, 0x49, 0x36, 0x00, 0x00, // B
0x3E, 0x41, 0x41, 0x41, 0x22, 0x00, 0x00, // C
0x7F, 0x7F, 0x41, 0x41, 0x63, 0x3E, 0x1C, // D
0x7F, 0x49, 0x49, 0x49, 0x41, 0x00, 0x00, // E
0x7F, 0x09, 0x09, 0x01, 0x01, 0x00, 0x00, // F
0x3E, 0x41, 0x41, 0x51, 0x32, 0x00, 0x00, // G
0x7F, 0x08, 0x08, 0x08, 0x7F, 0x00, 0x00, // H
0x00, 0x41, 0x7F, 0x41, 0x00, 0x00, 0x00, // I
0x20, 0x40, 0x41, 0x3F, 0x01, 0x00, 0x00, // J
0x7F, 0x08, 0x14, 0x22, 0x41, 0x00, 0x00, // K
0x7F, 0x7F, 0x40, 0x40, 0x40, 0x40, 0x00, // L
0x7F, 0x02, 0x04, 0x02, 0x7F, 0x00, 0x00, // M
0x7F, 0x04, 0x08, 0x10, 0x7F, 0x00, 0x00, // N
0x3E, 0x7F, 0x41, 0x41, 0x41, 0x7F, 0x3E, // O
0x7F, 0x09, 0x09, 0x09, 0x06, 0x00, 0x00, // P
0x3E, 0x41, 0x51, 0x21, 0x5E, 0x00, 0x00, // Q
0x7F, 0x7F, 0x11, 0x31, 0x79, 0x6F, 0x4E, // R
0x46, 0x49, 0x49, 0x49, 0x31, 0x00, 0x00, // S
0x01, 0x01, 0x7F, 0x01, 0x01, 0x00, 0x00, // T
0x3F, 0x40, 0x40, 0x40, 0x3F, 0x00, 0x00, // U
0x1F, 0x20, 0x40, 0x20, 0x1F, 0x00, 0x00, // V
0x7F, 0x7F, 0x38, 0x1C, 0x38, 0x7F, 0x7F, // W
0x63, 0x14, 0x08, 0x14, 0x63, 0x00, 0x00, // X
0x03, 0x04, 0x78, 0x04, 0x03, 0x00, 0x00, // Y
0x61, 0x51, 0x49, 0x45, 0x43, 0x00, 0x00, // Z
0x00, 0x00, 0x7F, 0x41, 0x41, 0x00, 0x00, // [
0x02, 0x04, 0x08, 0x10, 0x20, 0x00, 0x00, // "\"
0x41, 0x41, 0x7F, 0x00, 0x00, 0x00, 0x00, // ]
0x04, 0x02, 0x01, 0x02, 0x04, 0x00, 0x00, // ^
0x40, 0x40, 0x40, 0x40, 0x40, 0x00, 0x00, // _
0x00, 0x01, 0x02, 0x04, 0x00, 0x00, 0x00, // `
0x20, 0x54, 0x54, 0x54, 0x78, 0x00, 0x00, // a
0x7F, 0x48, 0x44, 0x44, 0x38, 0x00, 0x00, // b
0x38, 0x44, 0x44, 0x44, 0x20, 0x00, 0x00, // c
0x38, 0x44, 0x44, 0x48, 0x7F, 0x00, 0x00, // d
0x38, 0x54, 0x54, 0x54, 0x18, 0x00, 0x00, // e
0x08, 0x7E, 0x09, 0x01, 0x02, 0x00, 0x00, // f
0x08, 0x14, 0x54, 0x54, 0x3C, 0x00, 0x00, // g
0x7F, 0x08, 0x04, 0x04, 0x78, 0x00, 0x00, // h
0x00, 0x44, 0x7D, 0x40, 0x00, 0x00, 0x00, // i
0x20, 0x40, 0x44, 0x3D, 0x00, 0x00, 0x00, // j
0x00, 0x7F, 0x10, 0x28, 0x44, 0x00, 0x00, // k
0x00, 0x41, 0x7F, 0x40, 0x00, 0x00, 0x00, // l
0x7C, 0x04, 0x18, 0x04, 0x78, 0x00, 0x00, // m
0x7C, 0x08, 0x04, 0x04, 0x78, 0x00, 0x00, // n
0x38, 0x44, 0x44, 0x44, 0x38, 0x00, 0x00, // o
0x7C, 0x14, 0x14, 0x14, 0x08, 0x00, 0x00, // p
0x08, 0x14, 0x14, 0x18, 0x7C, 0x00, 0x00, // q
0x7C, 0x08, 0x04, 0x04, 0x08, 0x00, 0x00, // r
0x48, 0x54, 0x54, 0x54, 0x20, 0x00, 0x00, // s
0x04, 0x3F, 0x44, 0x40, 0x20, 0x00, 0x00, // t
0x3C, 0x40, 0x40, 0x20, 0x7C, 0x00, 0x00, // u
0x1C, 0x20, 0x40, 0x20, 0x1C, 0x00, 0x00, // v
0x3C, 0x40, 0x30, 0x40, 0x3C, 0x00, 0x00, // w
0x00, 0x44, 0x28, 0x10, 0x28, 0x44, 0x00, // x
0x0C, 0x50, 0x50, 0x50, 0x3C, 0x00, 0x00, // y
0x44, 0x64, 0x54, 0x4C, 0x44, 0x00, 0x00, // z
0x00, 0x08, 0x36, 0x41, 0x00, 0x00, 0x00, // {
0x00, 0x00, 0x7F, 0x00, 0x00, 0x00, 0x00, // |
0x00, 0x41, 0x36, 0x08, 0x00, 0x00, 0x00, // }
0x08, 0x08, 0x2A, 0x1C, 0x08, 0x00, 0x00, // ->
0x08, 0x1C, 0x2A, 0x08, 0x08, 0x00, 0x00, // <-
];
for c in bytes {
/* Create an array with our I2C instruction and a blank column at the end */
let mut data: [u8; 9] = [SSD1306_BYTE_DATA, 0, 0, 0, 0, 0, 0, 0, 0];
/* Calculate our index into the character table above */
let index = (*c as usize - 0x20) * 7;
/* Populate the middle of the array with the data from the character array at the right
* index */
data[1..8].copy_from_slice(&FONT_7X7[index..index + 7]);
/* Write it out to the I2C bus */
i2c.write(0x3C, &data)?
}
Ok(())
}
/// Initialise display with some useful values
fn ssd1306_init<I2C, E>(i2c: &mut I2C) -> Result<(), E>
where
I2C: Write<Error = E>,
{
i2c.write(0x3C, &[SSD1306_BYTE_CMD_SINGLE, SSD1306_DISPLAY_OFF])?;
i2c.write(
0x3C,
&[SSD1306_BYTE_CMD_SINGLE, SSD1306_DISPLAY_CLK_DIV, 0x80],
)?;
i2c.write(0x3C, &[SSD1306_BYTE_CMD_SINGLE, SSD1306_SCAN_MODE_NORMAL])?;
i2c.write(
0x3C,
&[SSD1306_BYTE_CMD_SINGLE, SSD1306_DISPLAY_OFFSET, 0x00, 0x00],
)?;
i2c.write(
0x3C,
&[SSD1306_BYTE_CMD_SINGLE, SSD1306_MEMORY_ADDR_MODE, 0x00],
)?;
i2c.write(
0x3C,
&[SSD1306_BYTE_CMD_SINGLE, SSD1306_DISPLAY_START_LINE, 0x00],
)?;
i2c.write(0x3C, &[SSD1306_BYTE_CMD_SINGLE, SSD1306_CHARGE_PUMP, 0x14])?;
i2c.write(0x3C, &[SSD1306_BYTE_CMD_SINGLE, SSD1306_PIN_MAP, 0x12])?;
i2c.write(0x3C, &[SSD1306_BYTE_CMD_SINGLE, SSD1306_DISPLAY_RAM])?;
i2c.write(0x3C, &[SSD1306_BYTE_CMD_SINGLE, SSD1306_DISPLAY_NORMAL])?;
i2c.write(0x3C, &[SSD1306_BYTE_CMD_SINGLE, SSD1306_DISPLAY_ON])?;
let data = [
SSD1306_BYTE_DATA,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
];
for _ in 0..128 {
i2c.write(0x3C, &data)?;
}
Ok(())
}
/// Position cursor at specified x, y block coordinate (multiple of 8)
fn ssd1306_pos<I2C, E>(i2c: &mut I2C, x: u8, y: u8) -> Result<(), E>
where
I2C: Write<Error = E>,
{
let data = [
SSD1306_BYTE_CMD,
SSD1306_COLUMN_RANGE,
x * 8,
0x7F,
SSD1306_PAGE_RANGE,
y,
0x07,
];
i2c.write(0x3C, &data)
}