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#![no_std]
#![no_main]
use defmt::*;
use embassy_executor::Spawner;
use embassy_stm32::adc::{self, Adc, AdcChannel, RxDma, SampleTime};
use embassy_stm32::peripherals::{ADC1, ADC2, GPDMA1_CH0, GPDMA1_CH1, PA0, PA1, PA2, PA3};
use embassy_stm32::{Config, Peri};
use embassy_time::Instant;
use {defmt_rtt as _, panic_probe as _};
#[embassy_executor::main]
async fn main(spawner: Spawner) {
let mut config = Config::default();
{
use embassy_stm32::rcc::*;
config.rcc.hsi = Some(HSIPrescaler::DIV1);
config.rcc.csi = true;
config.rcc.pll1 = Some(Pll {
source: PllSource::HSI,
prediv: PllPreDiv::DIV4,
mul: PllMul::MUL25,
divp: Some(PllDiv::DIV2),
divq: Some(PllDiv::DIV4), // SPI1 cksel defaults to pll1_q
divr: None,
});
config.rcc.pll2 = Some(Pll {
source: PllSource::HSI,
prediv: PllPreDiv::DIV4,
mul: PllMul::MUL25,
divp: None,
divq: None,
divr: Some(PllDiv::DIV4), // 100mhz
});
config.rcc.sys = Sysclk::PLL1_P; // 200 Mhz
config.rcc.ahb_pre = AHBPrescaler::DIV1; // 200 Mhz
config.rcc.apb1_pre = APBPrescaler::DIV2; // 100 Mhz
config.rcc.apb2_pre = APBPrescaler::DIV2; // 100 Mhz
config.rcc.apb3_pre = APBPrescaler::DIV2; // 100 Mhz
config.rcc.voltage_scale = VoltageScale::Scale1;
config.rcc.mux.adcdacsel = mux::Adcdacsel::PLL2_R;
}
let p = embassy_stm32::init(config);
spawner.spawn(unwrap!(adc1_task(p.ADC1, p.GPDMA1_CH0, p.PA0, p.PA2)));
spawner.spawn(unwrap!(adc2_task(p.ADC2, p.GPDMA1_CH1, p.PA1, p.PA3)));
}
#[embassy_executor::task]
async fn adc1_task(
adc: Peri<'static, ADC1>,
dma: Peri<'static, GPDMA1_CH0>,
pin1: Peri<'static, PA0>,
pin2: Peri<'static, PA2>,
) {
adc_task(adc, dma, pin1, pin2).await;
}
#[embassy_executor::task]
async fn adc2_task(
adc: Peri<'static, ADC2>,
dma: Peri<'static, GPDMA1_CH1>,
pin1: Peri<'static, PA1>,
pin2: Peri<'static, PA3>,
) {
adc_task(adc, dma, pin1, pin2).await;
}
async fn adc_task<'a, T: adc::Instance>(
adc: Peri<'a, T>,
mut dma: Peri<'a, impl RxDma<T>>,
pin1: impl AdcChannel<T>,
pin2: impl AdcChannel<T>,
) {
let mut adc = Adc::new(adc);
let mut pin1 = pin1.degrade_adc();
let mut pin2 = pin2.degrade_adc();
let mut tic = Instant::now();
let mut buffer = [0u16; 512];
loop {
// This is not a true continuous read as there is downtime between each
// call to `Adc::read` where the ADC is sitting idle.
adc.read(
dma.reborrow(),
[(&mut pin1, SampleTime::CYCLES2_5), (&mut pin2, SampleTime::CYCLES2_5)].into_iter(),
&mut buffer,
)
.await;
let toc = Instant::now();
info!("\n adc1: {} dt = {}", buffer[0..16], (toc - tic).as_micros());
tic = toc;
}
}
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