From 8eeff8502d56612ce6fea55d01990a21e665ac43 Mon Sep 17 00:00:00 2001
From: klownfish <github@clownfish.xyz>
Date: Wed, 18 Dec 2024 01:46:26 +0100
Subject: [PATCH] better u5 adc example

---
 examples/stm32u5/src/bin/adc.rs | 65 ++++++++++++++++++++++-----------
 1 file changed, 43 insertions(+), 22 deletions(-)

diff --git a/examples/stm32u5/src/bin/adc.rs b/examples/stm32u5/src/bin/adc.rs
index f97facf9e..049b985cf 100644
--- a/examples/stm32u5/src/bin/adc.rs
+++ b/examples/stm32u5/src/bin/adc.rs
@@ -6,6 +6,7 @@ use defmt::{*};
 use defmt_rtt as _;
 
 use embassy_stm32::adc;
+use embassy_stm32::adc::AdcChannel;
 use embassy_stm32::adc::adc4;
 use panic_probe as _;
 
@@ -33,37 +34,57 @@ async fn main(spawner: embassy_executor::Spawner) {
 
     }
 
-    let p = embassy_stm32::init(config);
-    info!("Hello World!");
+    let mut p = embassy_stm32::init(config);
 
     let mut adc = adc::Adc::new(p.ADC1);
-    let mut adc_pin = p.PA3;
+    let mut adc_pin1 = p.PA3; // A0 on nucleo u5a5
+    let mut adc_pin2 = p.PA2; // A1 on nucleo u5a5
     adc.set_resolution(adc::Resolution::BITS14);
     adc.set_averaging(adc::Averaging::Samples1024);
-    adc.set_sample_time(adc::SampleTime::CYCLES1_5);
-
-    let mut adc2 = adc::Adc::new(p.ADC2);
-    let mut adc_pin2 = p.PA5;
-    adc2.set_resolution(adc::Resolution::BITS14);
-    adc2.set_averaging(adc::Averaging::Samples1024);
-    adc2.set_sample_time(adc::SampleTime::CYCLES1_5);
+    adc.set_sample_time(adc::SampleTime::CYCLES160_5);
+    let max = adc::resolution_to_max_count(adc::Resolution::BITS14);
 
     let mut adc4 = adc4::Adc4::new(p.ADC4);
-    let mut adc_pin4 = p.PD11;
+    let mut adc4_pin1 = p.PD11;
+    let mut adc4_pin2 = p.PC0;
     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);
 
-    loop {
-        embassy_time::Timer::after_millis(100).await;
-        let raw :u16 = adc.blocking_read(&mut adc_pin);
-        let max = adc::resolution_to_max_count(adc::Resolution::BITS14);
-        let volt: f32 = 3.3 * raw as f32 / max as f32;
-        info!("Read ADC1 {}", volt);
+    let raw: u16 = adc.blocking_read(&mut adc_pin1);
+    let volt: f32 = 3.3 * raw as f32 / max as f32;
+    info!("Read 1 pin 1 {}", volt);
+
+    let raw: u16 = adc.blocking_read(&mut adc_pin2);
+    let volt: f32 = 3.3 * raw as f32 / max as f32;
+    info!("Read 1 pin 2 {}", volt);
+
+    let raw4: u16 = adc4.blocking_read(&mut adc4_pin1);
+    let volt4: f32 = 3.3 * raw4 as f32 / max4 as f32;
+    info!("Read 4 pin 1 {}", volt4);
+
+    let raw4: u16 = adc4.blocking_read(&mut adc4_pin2);
+    let volt4: f32 = 3.3 * raw4 as f32 / max4 as f32;
+    info!("Read 4 pin 2 {}", volt4);
+
+    let mut degraded1 = adc_pin1.degrade_adc();
+    let mut degraded2 = adc_pin2.degrade_adc();
+    let mut measurements = [0u16; 2];
+
+    adc.read(
+        &mut p.GPDMA1_CH0,
+        [
+            (&mut degraded2, adc::SampleTime::CYCLES160_5),
+            (&mut degraded1, adc::SampleTime::CYCLES160_5),
+        ]
+        .into_iter(),
+        &mut measurements,
+    ).await;
+    let volt1: f32 = 3.3 * measurements[1] as f32 / max as f32;
+    let volt2: f32 = 3.3 * measurements[0] as f32 / max as f32;
+
+    info!("Async read 1 pin 1 {}", volt1);
+    info!("Async read 1 pin 2 {}", volt2);
 
-        let raw4 :u16 = adc4.blocking_read(&mut adc_pin4);
-        let max4 = adc4::resolution_to_max_count(adc4::Resolution::BITS12);
-        let volt4: f32 = 3.3 * raw4 as f32 / max4 as f32;
-        info!("Read ADC4 {}", volt4);
-    }
 }
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