Merge pull request #3688 from klownfish/u5_adc

STM32U5: Add ADC drivers

1 files changed, 109 insertions, 0 deletions

diff --git a/examples/stm32u5/src/bin/adc.rs b/examples/stm32u5/src/bin/adc.rs
new file mode 100644
index 000000000..6ba21cc63
--- /dev/null
+++ b/examples/stm32u5/src/bin/adc.rs
@@ -0,0 +1,109 @@
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_stm32::adc;
+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);
+
+    // **** 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.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);
+
+    // **** 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 = adc2.blocking_read(&mut adc2_pin2);
+    let volt: f32 = 3.3 * raw as f32 / max2 as f32;
+    info!("Read adc2 pin 2 {}", volt);
+
+    // **** 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 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);
+
+    // **** ADC1 async read ****
+    let mut degraded11 = adc1_pin1.degrade_adc();
+    let mut degraded12 = adc1_pin2.degrade_adc();
+    let mut measurements = [0u16; 2];
+
+    adc1.read(
+        &mut p.GPDMA1_CH0,
+        [
+            (&mut degraded11, adc::SampleTime::CYCLES160_5),
+            (&mut degraded12, adc::SampleTime::CYCLES160_5),
+        ]
+        .into_iter(),
+        &mut measurements,
+    )
+    .await;
+    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);
+}