Add adc examples

Author: usbalbin

examples/adc.rs

@@ -0,0 +1,90 @@
+//! Example of reading a voltage with ADC1
+//!
+//! For an example of using ADC1 and ADC2 together, see examples/adc12.rs
+
+#![no_main]
+#![no_std]
+
+use cortex_m_rt::entry;
+
+use embedded_hal_02::adc::OneShot;
+use stm32h5xx_hal::{
+    adc, delay::Delay, pac, prelude::*, rcc::rec::AdcDacClkSel,
+};
+use utilities::logger::info;
+
+#[macro_use]
+mod utilities;
+
+#[entry]
+fn main() -> ! {
+    utilities::logger::init();
+    let cp = cortex_m::Peripherals::take().unwrap();
+    let dp = pac::Peripherals::take().unwrap();
+
+    // Constrain and Freeze power
+    info!("Setup PWR...                  ");
+    let pwr = dp.PWR.constrain();
+    let pwrcfg = pwr.freeze();
+
+    // Constrain and Freeze clock
+    info!("Setup RCC...                  ");
+    let rcc = dp.RCC.constrain();
+
+    // We need to configure a clock for adc_ker_ck_input. The default
+    // adc_ker_ck_input is pll2_p_ck, but we will use per_ck. per_ck is sourced
+    // from the 64MHz HSI
+    //
+    // adc_ker_ck_input is then divided by the ADC prescaler to give f_adc. The
+    // maximum f_adc is 50MHz
+    let mut ccdr = rcc
+        .sys_ck(192.MHz())
+        .pll1_q_ck(64.MHz())
+        .freeze(&pwrcfg, &dp.SBS);
+
+    // Switch adc_ker_ck_input multiplexer to per_ck
+    ccdr.peripheral.kernel_adcdac_clk_mux(AdcDacClkSel::HsiKer);
+
+    info!("");
+    info!("stm32h5xx-hal example - ADC");
+    info!("");
+
+    let mut delay = Delay::new(cp.SYST, &ccdr.clocks);
+
+    // Setup ADC
+    let mut adc1 = adc::Adc::new(
+        dp.ADC1,
+        4.MHz(),
+        &mut delay,
+        ccdr.peripheral.ADC,
+        &ccdr.clocks,
+        &pwrcfg,
+    );
+
+    let mut temp = adc::Temperature::new();
+    temp.enable(&mut adc1);
+    let mut adc1: adc::Adc<
+        stm32h5::Periph<pac::adc1::RegisterBlock, 1107460096>,
+        adc::Enabled,
+    > = adc1.enable();
+
+    // We can't use ADC2 here because ccdr.peripheral.ADC12 has been
+    // consumed. See examples/adc12.rs
+
+    // Setup GPIOC
+    let gpioc = dp.GPIOC.split(ccdr.peripheral.GPIOC);
+
+    // Configure pc0 as an analog input
+    let mut channel = gpioc.pc0.into_analog(); // ANALOG IN 10
+
+    loop {
+        let data = adc1.read(&mut channel).unwrap();
+        // voltage = reading * (vref/resolution)
+        info!(
+            "ADC reading: {}, voltage for nucleo: {}V. Temp reading: {}",
+            data,
+            data as f32 * (3.3 / adc1.slope() as f32),
+            adc1.read(&mut temp).unwrap()
+        );
+    }
+}

examples/adc12.rs

@@ -0,0 +1,83 @@
+//! Example of using ADC1 and ADC2 together
+//!
+//! This is not available for H503 since it only has ADC1
+//!
+//! For an example of using ADC1 alone, see examples/adc.rs
+
+#![no_main]
+#![no_std]
+
+use cortex_m_rt::entry;
+
+use embedded_hal_02::adc::OneShot;
+use stm32h5xx_hal::{
+    adc, delay::Delay, pac, prelude::*, rcc::rec::AdcDacClkSel,
+};
+use utilities::logger::info;
+
+#[macro_use]
+mod utilities;
+
+#[entry]
+fn main() -> ! {
+    utilities::logger::init();
+    let cp = cortex_m::Peripherals::take().unwrap();
+    let dp = pac::Peripherals::take().unwrap();
+
+    // Constrain and Freeze power
+    info!("Setup PWR...                  ");
+    let pwr = dp.PWR.constrain();
+    let pwrcfg = pwr.freeze();
+
+    // Constrain and Freeze clock
+    info!("Setup RCC...                  ");
+    let rcc = dp.RCC.constrain();
+
+    // We need to configure a clock for adc_ker_ck_input. The default
+    // adc_ker_ck_input is pll2_p_ck, but we will use per_ck. per_ck is sourced
+    // from the 64MHz HSI
+    //
+    // adc_ker_ck_input is then divided by the ADC prescaler to give f_adc. The
+    // maximum f_adc is 50MHz
+    let mut ccdr = rcc
+        .sys_ck(192.MHz())
+        .pll1_q_ck(64.MHz())
+        .freeze(&pwrcfg, &dp.SBS);
+
+    // Switch adc_ker_ck_input multiplexer to per_ck
+    ccdr.peripheral.kernel_adcdac_clk_mux(AdcDacClkSel::HsiKer);
+
+    info!("");
+    info!("stm32h5xx-hal example - ADC1 and ADC2");
+    info!("");
+
+    let mut delay = Delay::new(cp.SYST, &ccdr.clocks);
+
+    // Setup ADC
+    // Setup ADC1 and ADC2
+    let (adc1, adc2) = adc::adc12(
+        dp.ADC1,
+        dp.ADC2,
+        4.MHz(),
+        &mut delay,
+        ccdr.peripheral.ADC,
+        &ccdr.clocks,
+        &pwrcfg,
+    );
+
+    let mut adc1 = adc1.enable();
+    let mut adc2 = adc2.enable();
+
+    // Setup GPIOC
+    // NOTE: PC2 and PC3 are only pinned out on TFBGA packages!!
+    let gpioc = dp.GPIOC.split(ccdr.peripheral.GPIOC);
+    let mut channel_pc2 = gpioc.pc2.into_analog(); // AIN 12
+    let mut channel_pc3 = gpioc.pc3.into_analog(); // AIN 13
+
+    loop {
+        let data_pc2: u32 = adc1.read(&mut channel_pc2).unwrap();
+        let data_pc3: u32 = adc2.read(&mut channel_pc3).unwrap();
+        // voltage = reading * (vref/resolution)
+        info!("ADC readings: {} {}", data_pc2, data_pc3);
+    }
+}