58 lines
1.8 KiB
Rust
58 lines
1.8 KiB
Rust
//! adc oversampling example
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//!
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//! This example uses adc oversampling to achieve 16bit data
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#![no_std]
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#![no_main]
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use defmt::*;
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use embassy_executor::Spawner;
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use embassy_stm32::adc::vals::{Rovsm, Trovs};
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use embassy_stm32::adc::{Adc, SampleTime};
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use embassy_stm32::Config;
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use embassy_time::Timer;
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use {defmt_rtt as _, panic_probe as _};
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#[embassy_executor::main]
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async fn main(_spawner: Spawner) {
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let mut config = Config::default();
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{
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use embassy_stm32::rcc::*;
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config.rcc.pll = Some(Pll {
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source: PllSource::HSI,
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prediv: PllPreDiv::DIV4,
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mul: PllMul::MUL85,
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divp: None,
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divq: None,
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// Main system clock at 170 MHz
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divr: Some(PllRDiv::DIV2),
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});
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config.rcc.mux.adc12sel = mux::Adcsel::SYS;
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config.rcc.sys = Sysclk::PLL1_R;
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}
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let mut p = embassy_stm32::init(config);
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let mut adc = Adc::new(p.ADC1);
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adc.set_sample_time(SampleTime::CYCLES6_5);
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// From https://www.st.com/resource/en/reference_manual/rm0440-stm32g4-series-advanced-armbased-32bit-mcus-stmicroelectronics.pdf
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// page652 Oversampler
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// Table 172. Maximum output results vs N and M. Grayed values indicates truncation
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// 0x00 oversampling ratio X2
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// 0x01 oversampling ratio X4
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// 0x02 oversampling ratio X8
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// 0x03 oversampling ratio X16
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// 0x04 oversampling ratio X32
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// 0x05 oversampling ratio X64
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// 0x06 oversampling ratio X128
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// 0x07 oversampling ratio X256
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adc.set_oversampling_ratio(0x03); // ratio X3
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adc.set_oversampling_shift(0b0000); // no shift
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adc.enable_regular_oversampling_mode(Rovsm::RESUMED, Trovs::AUTOMATIC, true);
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loop {
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let measured = adc.blocking_read(&mut p.PA0);
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info!("data: 0x{:X}", measured); //max 0xFFF0 -> 65520
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Timer::after_millis(500).await;
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}
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}
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