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https://github.com/esp-rs/esp-idf-hal.git
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8cc193aa35
* Hacky async TWAI driver * Async TWAI: Custom priority and pin to core * Async TWAI: Proper configuration of alerts * Do not refer to esp-idf-sys as it is not an explicit dependency anymore
74 lines
2.7 KiB
Rust
74 lines
2.7 KiB
Rust
//! I2C test with SSD1306
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//!
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//! Folowing pins are used:
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//! SDA GPIO5
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//! SCL GPIO6
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//!
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//! Depending on your target and the board you are using you have to change the pins.
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//!
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//! For this example you need to hook up an SSD1306 I2C display.
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//! The display will flash black and white.
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use esp_idf_hal::delay::{FreeRtos, BLOCK};
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use esp_idf_hal::i2c::*;
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use esp_idf_hal::peripherals::Peripherals;
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use esp_idf_hal::prelude::*;
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const SSD1306_ADDRESS: u8 = 0x3c;
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fn main() -> anyhow::Result<()> {
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esp_idf_hal::sys::link_patches();
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let peripherals = Peripherals::take().unwrap();
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let i2c = peripherals.i2c0;
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let sda = peripherals.pins.gpio5;
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let scl = peripherals.pins.gpio6;
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println!("Starting I2C SSD1306 test");
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let config = I2cConfig::new().baudrate(100.kHz().into());
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let mut i2c = I2cDriver::new(i2c, sda, scl, &config)?;
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// initialze the display - don't worry about the meaning of these bytes - it's specific to SSD1306
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i2c.write(SSD1306_ADDRESS, &[0, 0xae], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0xd4], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0x80], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0xa8], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0x3f], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0xd3], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0x00], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0x40], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0x8d], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0x14], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0xa1], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0xc8], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0xda], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0x12], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0x81], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0xcf], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0xf1], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0xdb], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0x40], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0xa4], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0xa6], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0xaf], BLOCK)?;
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i2c.write(SSD1306_ADDRESS, &[0, 0x20, 0x00], BLOCK)?;
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// fill the display
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for _ in 0..64 {
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let data: [u8; 17] = [
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0x40, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff,
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];
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i2c.write(SSD1306_ADDRESS, &data, BLOCK)?;
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}
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loop {
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// we are sleeping here to make sure the watchdog isn't triggered
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FreeRtos::delay_ms(500);
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i2c.write(SSD1306_ADDRESS, &[0, 0xa6], BLOCK)?;
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FreeRtos::delay_ms(500);
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i2c.write(SSD1306_ADDRESS, &[0, 0xa7], BLOCK)?;
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}
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}
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