Merge pull request #1973 from xoviat/opamp

stm32: add opamp

1 files changed, 59 insertions, 0 deletions

diff --git a/examples/stm32f334/src/bin/opamp.rs b/examples/stm32f334/src/bin/opamp.rs
new file mode 100644
index 000000000..72263bab8
--- /dev/null
+++ b/examples/stm32f334/src/bin/opamp.rs
@@ -0,0 +1,59 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::info;
+use embassy_executor::Spawner;
+use embassy_stm32::adc::{Adc, SampleTime};
+use embassy_stm32::opamp::OpAmp;
+use embassy_stm32::peripherals::ADC2;
+use embassy_stm32::rcc::AdcClockSource;
+use embassy_stm32::time::mhz;
+use embassy_stm32::{adc, bind_interrupts, Config};
+use embassy_time::{Delay, Duration, Timer};
+use {defmt_rtt as _, panic_probe as _};
+
+bind_interrupts!(struct Irqs {
+    ADC1_2 => adc::InterruptHandler<ADC2>;
+});
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) -> ! {
+    let mut config = Config::default();
+    config.rcc.sysclk = Some(mhz(64));
+    config.rcc.hclk = Some(mhz(64));
+    config.rcc.pclk1 = Some(mhz(32));
+    config.rcc.pclk2 = Some(mhz(64));
+    config.rcc.adc = Some(AdcClockSource::PllDiv1);
+
+    let mut p = embassy_stm32::init(config);
+
+    info!("create adc...");
+
+    let mut adc = Adc::new(p.ADC2, Irqs, &mut Delay);
+    let mut opamp = OpAmp::new(p.OPAMP2);
+
+    adc.set_sample_time(SampleTime::Cycles601_5);
+
+    info!("enable vrefint...");
+
+    let mut vrefint = adc.enable_vref(&mut Delay);
+    let mut temperature = adc.enable_temperature();
+    let mut buffer = opamp.buffer_for(&mut p.PA7);
+
+    loop {
+        let vref = adc.read(&mut vrefint).await;
+        info!("read vref: {} (should be {})", vref, vrefint.value());
+
+        let temp = adc.read(&mut temperature).await;
+        info!("read temperature: {}", temp);
+
+        let buffer = adc.read(&mut buffer).await;
+        info!("read buffer: {}", buffer);
+
+        let pin_mv = (buffer as u32 * vrefint.value() as u32 / vref as u32) * 3300 / 4095;
+        info!("computed pin mv: {}", pin_mv);
+
+        Timer::after(Duration::from_millis(500)).await;
+    }
+}