Merge pull request #5 from robamu-org/mueller/temperature-sensor

Added I2C / Temperature Sensor example
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Robin Mueller 2021-12-02 12:20:34 +01:00 committed by GitHub
commit 6efb91fa54
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3 changed files with 81 additions and 9 deletions

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@ -16,7 +16,7 @@ cortex-m-rt = "0.7.0"
embedded-hal = "0.2.6"
[dependencies.va108xx-hal]
version = "0.2.1"
version = "0.2.2"
features = ["rt"]
[dev-dependencies]

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@ -2,7 +2,7 @@
#![no_main]
#![no_std]
use core::cell::{Cell, RefCell};
use core::cell::RefCell;
use cortex_m::interrupt::Mutex;
use cortex_m_rt::entry;
@ -14,13 +14,12 @@ use va108xx_hal::{
pac::{self, interrupt},
prelude::*,
time::Hertz,
timer::set_up_ms_timer,
timer::{default_ms_irq_handler, set_up_ms_timer},
};
use vorago_reb1::button::Button;
use vorago_reb1::leds::Leds;
static LEDS: Mutex<RefCell<Option<Leds>>> = Mutex::new(RefCell::new(None));
static MS_COUNTER: Mutex<Cell<u32>> = Mutex::new(Cell::new(0));
static BUTTON: Mutex<RefCell<Option<Button>>> = Mutex::new(RefCell::new(None));
#[derive(Debug, PartialEq)]
@ -95,11 +94,7 @@ fn unmask_irqs() {
#[interrupt]
fn OC0() {
cortex_m::interrupt::free(|cs| {
let mut ms = MS_COUNTER.borrow(cs).get();
ms += 1;
MS_COUNTER.borrow(cs).set(ms);
});
default_ms_irq_handler();
}
#[interrupt]

77
examples/temp-sensor.rs Normal file
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@ -0,0 +1,77 @@
#![no_main]
#![no_std]
use cortex_m_rt::entry;
use embedded_hal::blocking::i2c::SevenBitAddress;
use panic_rtt_target as _;
use rtt_target::{rprintln, rtt_init_print};
use va108xx_hal::{
i2c::{I2cMaster, I2cSpeed, MasterConfig},
pac::{self, interrupt, I2CA},
prelude::*,
timer::{default_ms_irq_handler, set_up_ms_timer, Delay},
};
#[allow(dead_code)]
enum RegAddresses {
Temperature = 0x00,
Configuration = 0x01,
THystSetpoint = 0x02,
TOsSetPoint = 0x03,
OneShot = 0x04,
}
const ADT75_I2C_ADDR: u8 = 0b1001000;
#[entry]
fn main() -> ! {
rtt_init_print!();
rprintln!("-- Vorago Temperature Sensor and I2C Example --");
let mut dp = pac::Peripherals::take().unwrap();
let tim0 = set_up_ms_timer(
&mut dp.SYSCONFIG,
&mut dp.IRQSEL,
50.mhz().into(),
dp.TIM0,
interrupt::OC0,
);
let mut delay = Delay::new(tim0);
unsafe {
cortex_m::peripheral::NVIC::unmask(pac::Interrupt::OC0);
}
let ms_cfg = MasterConfig::default();
let mut i2ca: I2cMaster<I2CA, SevenBitAddress> = I2cMaster::i2ca(
dp.I2CA,
ms_cfg,
50.mhz(),
I2cSpeed::Regular100khz,
Some(&mut dp.SYSCONFIG),
);
let mut cmd: [u8; 4] = [0; 4];
cmd[0] = RegAddresses::Temperature as u8;
let mut reply: [u8; 4] = [0; 4];
i2ca.write(ADT75_I2C_ADDR, &cmd[0..1])
.expect("I2C send transfer failed");
loop {
i2ca.read(ADT75_I2C_ADDR, &mut reply[0..2])
.expect("I2C read transfer failed");
let adc_code = (((reply[0] as u16) << 8) | reply[1] as u16) >> 4;
let temp_celcius: f32;
if ((adc_code >> 11) & 0x01) == 0 {
// Sign bit not set, positiv value
// Divide ADC code by 16 according to datasheet
temp_celcius = adc_code as f32 / 16.0;
} else {
// Calculation for negative values, assuming all 12 bits are used
temp_celcius = (adc_code - 4096) as f32 / 16.0;
}
rprintln!("Temperature in Celcius: {}", temp_celcius);
delay.delay_ms(500);
}
}
#[interrupt]
fn OC0() {
default_ms_irq_handler();
}