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