add async read for u5 ADC4

1 files changed, 73 insertions, 29 deletions

diff --git a/examples/stm32u5/src/bin/adc.rs b/examples/stm32u5/src/bin/adc.rs
index 049b985cf..4632f2cd1 100644
--- a/examples/stm32u5/src/bin/adc.rs
+++ b/examples/stm32u5/src/bin/adc.rs
@@ -36,55 +36,99 @@ async fn main(spawner: embassy_executor::Spawner) {
 
     let mut p = embassy_stm32::init(config);
 
-    let mut adc = adc::Adc::new(p.ADC1);
-    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::CYCLES160_5);
-    let max = adc::resolution_to_max_count(adc::Resolution::BITS14);
-
+    // **** ADC1 init ****
+    let mut adc1 = adc::Adc::new(p.ADC1);
+    let mut adc1_pin1 = p.PA3; // A0 on nucleo u5a5
+    let mut adc1_pin2 = p.PA2; // A1
+    adc1.set_resolution(adc::Resolution::BITS14);
+    adc1.set_averaging(adc::Averaging::Samples1024);
+    adc1.set_sample_time(adc::SampleTime::CYCLES160_5);
+    let max1 = adc::resolution_to_max_count(adc::Resolution::BITS14);
+
+    // **** ADC2 init ****
+    let mut adc2 = adc::Adc::new(p.ADC2);
+    let mut adc2_pin1 = p.PC3; // A2
+    let mut adc2_pin2 = p.PB0; // A3
+    adc2.set_resolution(adc::Resolution::BITS14);
+    adc2.set_averaging(adc::Averaging::Samples1024);
+    adc2.set_sample_time(adc::SampleTime::CYCLES160_5);
+    let max2 = adc::resolution_to_max_count(adc::Resolution::BITS14);
+
+    // **** ADC4 init ****
     let mut adc4 = adc4::Adc4::new(p.ADC4);
-    let mut adc4_pin1 = p.PD11;
-    let mut adc4_pin2 = p.PC0;
+    let mut adc4_pin1 = p.PC1; // A4
+    let mut adc4_pin2 = p.PC0; // 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);
 
-    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);
+    // **** ADC1 blocking read ****
+    let raw: u16 = adc1.blocking_read(&mut adc1_pin1);
+    let volt: f32 = 3.3 * raw as f32 / max1 as f32;
+    info!("Read adc1 pin 1 {}", volt);
+
+    let raw: u16 = adc1.blocking_read(&mut adc1_pin2);
+    let volt: f32 = 3.3 * raw as f32 / max1 as f32;
+    info!("Read adc1 pin 2 {}", volt);
+
+    // **** ADC2 blocking read ****
+    let raw: u16 = adc2.blocking_read(&mut adc2_pin1);
+    let volt: f32 = 3.3 * raw as f32 / max2 as f32;
+    info!("Read adc2 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 raw: u16 = adc2.blocking_read(&mut adc2_pin2);
+    let volt: f32 = 3.3 * raw as f32 / max2 as f32;
+    info!("Read adc2 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);
+    // **** ADC4 blocking read ****
+    let raw: u16 = adc4.blocking_read(&mut adc4_pin1);
+    let volt: f32 = 3.3 * raw as f32 / max4 as f32;
+    info!("Read adc4 pin 1 {}", volt);
 
-    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 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);
 
-    let mut degraded1 = adc_pin1.degrade_adc();
-    let mut degraded2 = adc_pin2.degrade_adc();
+    // **** ADC1 async read ****
+    let mut degraded11 = adc1_pin1.degrade_adc();
+    let mut degraded12 = adc1_pin2.degrade_adc();
     let mut measurements = [0u16; 2];
 
-    adc.read(
+    adc1.read(
         &mut p.GPDMA1_CH0,
         [
-            (&mut degraded2, adc::SampleTime::CYCLES160_5),
-            (&mut degraded1, adc::SampleTime::CYCLES160_5),
+            (&mut degraded11, adc::SampleTime::CYCLES160_5),
+            (&mut degraded12, 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;
+    let volt1: f32 = 3.3 * measurements[0] as f32 / max1 as f32;
+    let volt2: f32 = 3.3 * measurements[1] as f32 / max1 as f32;
 
     info!("Async read 1 pin 1 {}", volt1);
     info!("Async read 1 pin 2 {}", volt2);
 
+    // **** ADC2 does not support async read ****
+
+    // **** 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(
+        &mut p.GPDMA1_CH1,
+        [
+            &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 = 3.3 * measurements[1] as f32 / max4 as f32;
+    info!("Async read 4 pin 1 {}", volt1);
+    info!("Async read 4 pin 2 {}", volt2);
 }
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