Read co2 sensor data

This commit is contained in:
Frederik Menke 2024-07-20 21:13:54 +02:00
parent 8c3f7c70cc
commit 56ac102a9b
3 changed files with 77 additions and 3 deletions

1
Cargo.lock generated
View file

@ -152,6 +152,7 @@ dependencies = [
"embedded-storage",
"fixed",
"fixed-macro",
"futures",
"heapless 0.8.0",
"log",
"panic-probe",

View file

@ -4,6 +4,8 @@ version = "0.1.0"
edition = "2021"
[dependencies]
futures = { version = "0.3", default-features = false }
embassy-embedded-hal = { version = "0.1.0", features = ["defmt"] }
embassy-sync = { version = "0.6.0", features = ["defmt"] }
embassy-executor = { version = "0.5.0", features = ["task-arena-size-32768", "arch-cortex-m", "executor-thread", "executor-interrupt", "defmt", "integrated-timers"] }

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@ -6,6 +6,8 @@
#![no_std]
#![no_main]
use core::future::ready;
use byteorder::ByteOrder;
use defmt::*;
use embassy_embedded_hal::SetConfig;
@ -17,7 +19,9 @@ use embassy_rp::{gpio, spi};
use embedded_hal_bus::spi::ExclusiveDevice;
use embedded_sdmmc::sdcard::{DummyCsPin, SdCard};
use embedded_sdmmc::{Block, BlockDevice, BlockIdx, VolumeIdx};
use futures::{FutureExt, TryFutureExt};
use gpio::{Level, Output};
use usbd_hid::descriptor::MouseReport;
use {defmt_rtt as _, panic_probe as _};
use embassy_rp::i2c::{self, Config};
@ -31,8 +35,14 @@ struct DummyTimesource();
/// I2C Address of the co2 sensor
const CCS811_I2C_ADDRESS: u16 = 0x5A;
/// I2C Register addresses of the co2 sensor
/// Application I2C Register addresses of the co2 sensor
const CCS811_REGISTER_STATUS: u8 = 0x00;
const CCS811_REGISTER_MEAS_MODE: u8 = 0x01;
const CCS811_REGISTER_ALG_RESULT_DATA: u8 = 0x02;
/// Bootloader I2C Register addresses of the co2 sensor
const CCS811_REGISTER_BOOTLOADER_APP_START: u8 = 0xF4;
const CCS811_REGISTER_BOOTLOADER_STATUS: u8 = CCS811_REGISTER_STATUS;
impl embedded_sdmmc::TimeSource for DummyTimesource {
fn get_timestamp(&self) -> embedded_sdmmc::Timestamp {
@ -69,7 +79,7 @@ async fn main(spawner: Spawner) {
Timer::after(Duration::from_secs(1)).await;
debug!("Writing to I2C");
let mut status = [42];
let mut status = [42u8];
i2c.write_async(CCS811_I2C_ADDRESS, [CCS811_REGISTER_STATUS])
.await
.unwrap();
@ -77,10 +87,71 @@ async fn main(spawner: Spawner) {
i2c.read_async(CCS811_I2C_ADDRESS, &mut status)
.await
.unwrap();
let status = status[0];
info!("Reported status: {}", status);
match status {
16u8 => {}
144u8 => {
warn!("Sensor already in APP mode! Configuration may come from previous boot.");
}
unexpected => {
warn!(
"Sensor reported unexpected state after boot: {}",
unexpected
);
}
}
debug!("TASK ENDED: Main")
// APP_START does not require to write data
i2c.write_async(CCS811_I2C_ADDRESS, [CCS811_REGISTER_BOOTLOADER_APP_START])
.await
.unwrap();
// After APP_START, we have to wait 1 ms (according to datasheet)
Timer::after(Duration::from_millis(1000)).await;
// Mode 1 is 1 measurement per second
i2c.write_async(CCS811_I2C_ADDRESS, [CCS811_REGISTER_MEAS_MODE, 16])
.await
.unwrap();
loop {
let mut status = [42u8];
i2c.write_async(CCS811_I2C_ADDRESS, [CCS811_REGISTER_STATUS])
.await;
// .unwrap();
i2c.read_async(CCS811_I2C_ADDRESS, &mut status).await;
// .unwrap();
let status = status[0];
let mut measured_value_buffer = [42u8; 2];
let address_written = i2c
.write_async(CCS811_I2C_ADDRESS, [CCS811_REGISTER_ALG_RESULT_DATA])
.await
.ok();
let data_written = if let Some(()) = address_written {
i2c.read_async(CCS811_I2C_ADDRESS, &mut measured_value_buffer)
.await
.ok()
} else {
None
};
let measured_value = if let Some(()) = data_written {
Some(u16::from_be_bytes(measured_value_buffer))
} else {
None
};
info!(
"Reported status: {}\tMeasured value: {}",
status, measured_value
);
Timer::after(Duration::from_secs(2)).await;
}
}
#[embassy_executor::task]