From f597901879f353fcdd59b4a77505309c2aaed187 Mon Sep 17 00:00:00 2001
From: purepani <pani0028@umn.edu>
Date: Mon, 30 Jun 2025 03:04:52 -0500
Subject: Adds ADC example for STM32WBA

---
 examples/stm32wba/src/bin/adc.rs | 49 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 examples/stm32wba/src/bin/adc.rs

diff --git a/examples/stm32wba/src/bin/adc.rs b/examples/stm32wba/src/bin/adc.rs
new file mode 100644
index 000000000..a9651d57e
--- /dev/null
+++ b/examples/stm32wba/src/bin/adc.rs
@@ -0,0 +1,49 @@
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_stm32::adc::{adc4, AdcChannel};
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy_executor::main]
+async fn main(_spawner: embassy_executor::Spawner) {
+    let config = embassy_stm32::Config::default();
+
+    let mut p = embassy_stm32::init(config);
+
+    // **** ADC4 init ****
+    let mut adc4 = adc4::Adc4::new(p.ADC4);
+    let mut adc4_pin1 = p.PA0; // A4
+    let mut adc4_pin2 = p.PA1; // A5
+    adc4.set_resolution(adc4::Resolution::BITS12);
+    adc4.set_averaging(adc4::Averaging::Samples256);
+    adc4.set_sample_time(adc4::SampleTime::CYCLES1_5);
+    let max4 = adc4::resolution_to_max_count(adc4::Resolution::BITS12);
+
+    // **** ADC4 blocking read ****
+    let raw: u16 = adc4.blocking_read(&mut adc4_pin1);
+    let volt: f32 = 3.0 * raw as f32 / max4 as f32;
+    info!("Read adc4 pin 1 {}", volt);
+
+    let raw: u16 = adc4.blocking_read(&mut adc4_pin2);
+    let volt: f32 = 3.3 * raw as f32 / max4 as f32;
+    info!("Read adc4 pin 2 {}", volt);
+
+    // **** ADC4 async read ****
+    let mut degraded41 = adc4_pin1.degrade_adc();
+    let mut degraded42 = adc4_pin2.degrade_adc();
+    let mut measurements = [0u16; 2];
+
+    // The channels must be in ascending order and can't repeat for ADC4
+    adc4.read(
+        p.GPDMA1_CH1.reborrow(),
+        [&mut degraded42, &mut degraded41].into_iter(),
+        &mut measurements,
+    )
+    .await
+    .unwrap();
+    let volt2: f32 = 3.3 * measurements[0] as f32 / max4 as f32;
+    let volt1: f32 = 3.0 * measurements[1] as f32 / max4 as f32;
+    info!("Async read 4 pin 1 {}", volt1);
+    info!("Async read 4 pin 2 {}", volt2);
+}
-- 
cgit