a6b8f3d994
with uniform treatment of adc inputs it's easy enough to add a new sampling method. dma sampling only supports one channel at the moment, though round-robin sampling would be a simple extension (probably a new trait that's implemented for Channel and &[Channel]). continuous dma as proposed in #1608 also isn't done here, we'd expect that to be a compound dma::Channel that internally splits a buffer in half and dispatches callbacks or something like that.
50 lines
1.7 KiB
Rust
50 lines
1.7 KiB
Rust
//! This example test the ADC (Analog to Digital Conversion) of the RS2040 pin 26, 27 and 28.
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//! It also reads the temperature sensor in the chip.
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#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use defmt::*;
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use embassy_executor::Spawner;
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use embassy_rp::adc::{Adc, Channel, Config, InterruptHandler};
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use embassy_rp::bind_interrupts;
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use embassy_rp::gpio::Pull;
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use embassy_time::{Duration, Timer};
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use {defmt_rtt as _, panic_probe as _};
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bind_interrupts!(struct Irqs {
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ADC_IRQ_FIFO => InterruptHandler;
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});
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#[embassy_executor::main]
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async fn main(_spawner: Spawner) {
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let p = embassy_rp::init(Default::default());
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let mut adc = Adc::new(p.ADC, Irqs, Config::default());
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let mut p26 = Channel::new_pin(p.PIN_26, Pull::None);
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let mut p27 = Channel::new_pin(p.PIN_27, Pull::None);
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let mut p28 = Channel::new_pin(p.PIN_28, Pull::None);
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let mut ts = Channel::new_temp_sensor(p.ADC_TEMP_SENSOR);
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loop {
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let level = adc.read(&mut p26).await.unwrap();
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info!("Pin 26 ADC: {}", level);
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let level = adc.read(&mut p27).await.unwrap();
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info!("Pin 27 ADC: {}", level);
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let level = adc.read(&mut p28).await.unwrap();
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info!("Pin 28 ADC: {}", level);
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let temp = adc.read(&mut ts).await.unwrap();
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info!("Temp: {} degrees", convert_to_celsius(temp));
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Timer::after(Duration::from_secs(1)).await;
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}
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}
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fn convert_to_celsius(raw_temp: u16) -> f32 {
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// According to chapter 4.9.5. Temperature Sensor in RP2040 datasheet
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let temp = 27.0 - (raw_temp as f32 * 3.3 / 4096.0 - 0.706) / 0.001721;
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let sign = if temp < 0.0 { -1.0 } else { 1.0 };
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let rounded_temp_x10: i16 = ((temp * 10.0) + 0.5 * sign) as i16;
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(rounded_temp_x10 as f32) / 10.0
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}
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