diff --git a/examples/stm32h7/src/bin/adc_dma.rs b/examples/stm32h7/src/bin/adc_dma.rs new file mode 100644 index 000000000..6c0240453 --- /dev/null +++ b/examples/stm32h7/src/bin/adc_dma.rs @@ -0,0 +1,76 @@ +#![no_std] +#![no_main] + +use defmt::*; +use embassy_executor::Spawner; +use embassy_stm32::adc::{Adc, AdcChannel as _, SampleTime}; +use embassy_stm32::Config; +use embassy_time::Timer; +use {defmt_rtt as _, panic_probe as _}; + +#[link_section = ".ram_d3"] +static mut DMA_BUF: [u16; 2] = [0; 2]; + +#[embassy_executor::main] +async fn main(_spawner: Spawner) { + let mut read_buffer = unsafe { &mut DMA_BUF[..] }; + + 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::MUL50, + divp: Some(PllDiv::DIV2), + divq: Some(PllDiv::DIV8), // SPI1 cksel defaults to pll1_q + divr: None, + }); + config.rcc.pll2 = Some(Pll { + source: PllSource::HSI, + prediv: PllPreDiv::DIV4, + mul: PllMul::MUL50, + divp: Some(PllDiv::DIV8), // 100mhz + divq: None, + divr: None, + }); + config.rcc.sys = Sysclk::PLL1_P; // 400 Mhz + config.rcc.ahb_pre = AHBPrescaler::DIV2; // 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.apb4_pre = APBPrescaler::DIV2; // 100 Mhz + config.rcc.voltage_scale = VoltageScale::Scale1; + config.rcc.mux.adcsel = mux::Adcsel::PLL2_P; + } + let p = embassy_stm32::init(config); + + info!("Hello World!"); + + let mut adc = Adc::new(p.ADC3); + + let mut dma = p.DMA1_CH1; + let mut vrefint_channel = adc.enable_vrefint().degrade_adc(); + let mut pc0 = p.PC0.degrade_adc(); + + loop { + adc.read_async( + &mut dma, + [ + (&mut vrefint_channel, SampleTime::CYCLES387_5), + (&mut pc0, SampleTime::CYCLES810_5), + ] + .into_iter(), + &mut read_buffer, + ) + .await; + + let vrefint = read_buffer[0]; + let measured = read_buffer[1]; + info!("vrefint: {}", vrefint); + info!("measured: {}", measured); + Timer::after_millis(500).await; + } +}