62 lines
1.8 KiB
Rust
62 lines
1.8 KiB
Rust
#![no_std]
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#![no_main]
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// Example originally designed for stm32f411ceu6 reading an A1454 hall effect sensor on I2C1
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// DMA peripherals changed to compile for stm32f429zi, for the CI.
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use defmt::*;
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use embassy_executor::Spawner;
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use embassy_stm32::i2c::I2c;
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use embassy_stm32::time::Hertz;
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use embassy_stm32::{bind_interrupts, i2c, peripherals};
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use {defmt_rtt as _, panic_probe as _};
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const ADDRESS: u8 = 96;
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bind_interrupts!(struct Irqs {
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I2C1_EV => i2c::EventInterruptHandler<peripherals::I2C1>;
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I2C1_ER => i2c::ErrorInterruptHandler<peripherals::I2C1>;
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});
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#[embassy_executor::main]
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async fn main(_spawner: Spawner) {
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info!("Hello world!");
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let p = embassy_stm32::init(Default::default());
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let mut i2c = I2c::new(
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p.I2C1,
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p.PB8,
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p.PB7,
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Irqs,
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p.DMA1_CH6,
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p.DMA1_CH0,
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Hertz(100_000),
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Default::default(),
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);
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loop {
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let a1454_read_sensor_command = [0x1F];
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let mut sensor_data_buffer: [u8; 4] = [0, 0, 0, 0];
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match i2c
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.write_read(ADDRESS, &a1454_read_sensor_command, &mut sensor_data_buffer)
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.await
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{
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Ok(()) => {
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// Convert 12-bit signed integer into 16-bit signed integer.
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// Is the 12 bit number negative?
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if (sensor_data_buffer[2] & 0b00001000) == 0b0001000 {
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sensor_data_buffer[2] = sensor_data_buffer[2] | 0b11110000;
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}
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let mut sensor_value_raw: u16 = sensor_data_buffer[3].into();
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sensor_value_raw |= (sensor_data_buffer[2] as u16) << 8;
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let sensor_value: u16 = sensor_value_raw.into();
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let sensor_value = sensor_value as i16;
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info!("Data: {}", sensor_value);
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}
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Err(e) => error!("I2C Error during read: {:?}", e),
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}
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}
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}
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