78 lines
2.1 KiB
Rust
78 lines
2.1 KiB
Rust
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#![no_main]
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#![no_std]
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use cortex_m_rt::entry;
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use embedded_hal::blocking::i2c::SevenBitAddress;
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use panic_rtt_target as _;
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use rtt_target::{rprintln, rtt_init_print};
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use va108xx_hal::{
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i2c::{I2cMaster, I2cSpeed, MasterConfig},
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pac::{self, interrupt, I2CA},
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prelude::*,
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timer::{default_ms_irq_handler, set_up_ms_timer, Delay},
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};
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#[allow(dead_code)]
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enum RegAddresses {
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Temperature = 0x00,
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Configuration = 0x01,
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THystSetpoint = 0x02,
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TOsSetPoint = 0x03,
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OneShot = 0x04,
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}
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const ADT75_I2C_ADDR: u8 = 0b1001000;
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#[entry]
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fn main() -> ! {
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rtt_init_print!();
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rprintln!("-- Vorago Temperature Sensor and I2C Example --");
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let mut dp = pac::Peripherals::take().unwrap();
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let tim0 = set_up_ms_timer(
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&mut dp.SYSCONFIG,
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&mut dp.IRQSEL,
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50.mhz().into(),
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dp.TIM0,
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interrupt::OC0,
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);
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let mut delay = Delay::new(tim0);
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unsafe {
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cortex_m::peripheral::NVIC::unmask(pac::Interrupt::OC0);
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}
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let ms_cfg = MasterConfig::default();
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let mut i2ca: I2cMaster<I2CA, SevenBitAddress> = I2cMaster::i2ca(
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dp.I2CA,
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ms_cfg,
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50.mhz(),
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I2cSpeed::Regular100khz,
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Some(&mut dp.SYSCONFIG),
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);
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let mut cmd: [u8; 4] = [0; 4];
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cmd[0] = RegAddresses::Temperature as u8;
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let mut reply: [u8; 4] = [0; 4];
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i2ca.write(ADT75_I2C_ADDR, &cmd[0..1])
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.expect("I2C send transfer failed");
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loop {
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i2ca.read(ADT75_I2C_ADDR, &mut reply[0..2])
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.expect("I2C read transfer failed");
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let adc_code = (((reply[0] as u16) << 8) | reply[1] as u16) >> 4;
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let temp_celcius: f32;
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if ((adc_code >> 11) & 0x01) == 0 {
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// Sign bit not set, positiv value
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// Divide ADC code by 16 according to datasheet
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temp_celcius = adc_code as f32 / 16.0;
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} else {
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// Calculation for negative values, assuming all 12 bits are used
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temp_celcius = (adc_code - 4096) as f32 / 16.0;
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}
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rprintln!("Temperature in Celcius: {}", temp_celcius);
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delay.delay_ms(500);
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}
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}
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#[interrupt]
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fn OC0() {
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default_ms_irq_handler();
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}
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