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"stm32f411_adc" +version = "0.1.0" + +[dependencies] +cortex-m = { version = "0.7.6", features = ["critical-section-single-core"] } +cortex-m-rt = "0.7.1" +rtic = {version = "2.1.1", features=["thumbv7-backend", "rtic-monotonics"]} +panic-halt = "0.2.0" +embedded-hal = "1.0.0" +defmt = "0.3.5" +defmt-rtt = { version = "0.4.0"} +rtic-sync = "1.0.2" + +[dependencies.stm32f4xx-hal] +version = "0.21.0" +features = ["stm32f411"] # replace the model of your microcontroller here + +# this lets you use `cargo fix`! +[[bin]] +name = "stm32f411_adc" +test = false +bench = false + diff --git a/examples/stm32f411_adc/README.md b/examples/stm32f411_adc/README.md new file mode 100644 index 0000000000..972772dcc6 --- /dev/null +++ b/examples/stm32f411_adc/README.md @@ -0,0 +1,36 @@ +# STM32F411CEU6 ADC example +Working example to work with the internal ADC of the STM32F411CEU6 present on a Blackpill board. + +The `#init` task configures the ADC module for single-shot conversion and `PA1` as analog pin. + +Afterwards, the analog pin stored in a Potentiometer struct is set as a **local** resource to the hardware task associated to `EXTI0`. + +The `Adc` instance on the other hand, is set as a **shared** resource. The reason behind this approach is to allow other tasks make use of the only ADC module present on this microcontroller. + + + +## How-to + +### Build +Run `cargo build --release` to compile the code. If you run it for the first time, it will take some time to download and compile dependencies. + +### Run +Install `probe-rs` and configure it using the [debugging extension for VScode](https://probe.rs/docs/tools/debugger/). +The output should look like this: + +``` +INFO Current delay value 1900 +INFO Current ADC value 665 + +INFO Current delay value 1800 +INFO Current ADC value 1138 + +INFO Current delay value 1700 +INFO Current ADC value 1136 + +INFO Current delay value 1600 +INFO Current ADC value 811 + +INFO Current delay value 1500 +INFO Current ADC value 1752 +``` diff --git a/examples/stm32f411_adc/build.rs b/examples/stm32f411_adc/build.rs new file mode 100644 index 0000000000..d534cc3df6 --- /dev/null +++ b/examples/stm32f411_adc/build.rs @@ -0,0 +1,31 @@ +//! This build script copies the `memory.x` file from the crate root into +//! a directory where the linker can always find it at build time. +//! For many projects this is optional, as the linker always searches the +//! project root directory -- wherever `Cargo.toml` is. However, if you +//! are using a workspace or have a more complicated build setup, this +//! build script becomes required. Additionally, by requesting that +//! Cargo re-run the build script whenever `memory.x` is changed, +//! updating `memory.x` ensures a rebuild of the application with the +//! new memory settings. + +use std::env; +use std::fs::File; +use std::io::Write; +use std::path::PathBuf; + +fn main() { + // Put `memory.x` in our output directory and ensure it's + // on the linker search path. + let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap()); + File::create(out.join("memory.x")) + .unwrap() + .write_all(include_bytes!("memory.x")) + .unwrap(); + println!("cargo:rustc-link-search={}", out.display()); + + // By default, Cargo will re-run a build script whenever + // any file in the project changes. By specifying `memory.x` + // here, we ensure the build script is only re-run when + // `memory.x` is changed. + println!("cargo:rerun-if-changed=memory.x"); +} diff --git a/examples/stm32f411_adc/memory.x b/examples/stm32f411_adc/memory.x new file mode 100644 index 0000000000..f77e9f2c75 --- /dev/null +++ b/examples/stm32f411_adc/memory.x @@ -0,0 +1,6 @@ +MEMORY +{ + /* NOTE 1 K = 1 KiBi = 1024 bytes */ + FLASH : ORIGIN = 0x08000000, LENGTH = 512K + RAM : ORIGIN = 0x20000000, LENGTH = 96K +} \ No newline at end of file diff --git a/examples/stm32f411_adc/src/main.rs b/examples/stm32f411_adc/src/main.rs new file mode 100644 index 0000000000..830f5b6cf9 --- /dev/null +++ b/examples/stm32f411_adc/src/main.rs @@ -0,0 +1,159 @@ +#![deny(unsafe_code)] +#![deny(warnings)] +#![no_main] +#![no_std] + +use panic_halt as _; + +#[rtic::app(device = stm32f4xx_hal::pac, peripherals = true)] +mod app { + + use stm32f4xx_hal::pac::ADC1; + use stm32f4xx_hal::{ + adc::{ + config::{AdcConfig, SampleTime}, + Adc, + }, + gpio::{self, Analog, Edge, Input, Output, PushPull}, + pac::TIM1, + prelude::*, + timer, + }; + + use defmt_rtt as _; + + // A simple placeholder for the analog pin + struct Potentiometer { + analog_input: gpio::PA1, + } + + // Resources shared between tasks + #[shared] + struct Shared { + delayval: u32, + adc_module: Adc, + } + + // Local resources to specific tasks (cannot be shared) + #[local] + struct Local { + button: gpio::PA0, + pot_instance: Potentiometer, + led: gpio::PC13>, + delay: timer::DelayMs, + } + + #[init] + fn init(ctx: init::Context) -> (Shared, Local) { + let mut dp = ctx.device; + + // Configure and obtain handle for delay abstraction + // 1) Promote RCC structure to HAL to be able to configure clocks + let rcc = dp.RCC.constrain(); + + // 2) Configure the system clocks + // 25 MHz must be used for HSE on the Blackpill-STM32F411CE board according to manual + let clocks = rcc.cfgr.use_hse(25.MHz()).freeze(); + + // 3) Create delay handle + let delay = dp.TIM1.delay_ms(&clocks); + + // Configure the LED pin as a push pull output and obtain handle + // On the Blackpill STM32F411CEU6 there is an on-board LED connected to pin PC13 + // 1) Promote the GPIOC PAC struct + let gpioc = dp.GPIOC.split(); + + // 2) Configure PORTC OUTPUT Pins and Obtain Handle + let led = gpioc.pc13.into_push_pull_output(); + + // Configure the button pin as input and obtain handle + // On the Blackpill STM32F411CEU6 there is a button connected to pin PA0 + // 3) Promote the GPIOA PAC struct + let gpioa: gpio::gpioa::Parts = dp.GPIOA.split(); + // 4) Configure Pin and Obtain Handle + let mut button = gpioa.pa0.into_pull_up_input(); + + // 5) Configure pin A1 of the blackpill to be of type analog + // the input does not need to be mutable since we are only reading it. + let analog_input = gpioa.pa1.into_analog(); + + // 6) Configure the ADC modulke for single-shot conversion + let mut adc = Adc::adc1(dp.ADC1, true, AdcConfig::default()); + // Calibrate by calculates the system VDDA by sampling the internal VREF + // channel and comparing the result with the value stored at the factory. + adc.calibrate(); + + let pot_instance = Potentiometer { + analog_input: analog_input, + }; + + // Configure Button Pin for Interrupts + // 7) Promote SYSCFG structure to HAL to be able to configure interrupts + let mut syscfg = dp.SYSCFG.constrain(); + // 8) Make button an interrupt source + button.make_interrupt_source(&mut syscfg); + // 9) Configure the interruption to be triggered on a rising edge + button.trigger_on_edge(&mut dp.EXTI, Edge::Rising); + // 10) Enable gpio interrupt for button + button.enable_interrupt(&mut dp.EXTI); + + ( + // Initialization of shared resources. In this case delay value and the ADC instance + Shared { + delayval: 2000_u32, + adc_module: adc, + }, + // Initialization of task local resources + Local { + button, + pot_instance, + led, + delay, + }, + ) + } + + // Background task, runs whenever no other tasks are running + #[idle(local = [led, delay], shared = [delayval])] + fn idle(mut ctx: idle::Context) -> ! { + let led = ctx.local.led; + let delay = ctx.local.delay; + loop { + // Turn On LED + led.set_high(); + // Obtain shared delay variable and delay + delay.delay_ms(ctx.shared.delayval.lock(|del| *del)); + // Turn off LED + led.set_low(); + // Obtain shared delay variable and delay + delay.delay_ms(ctx.shared.delayval.lock(|del| *del)); + } + } + + // Handle the IRQ generated when the button is pressed and interact with local and shared resources. + #[task(binds = EXTI0, local = [button, pot_instance], shared=[delayval, adc_module])] + fn gpio_interrupt_handler(mut ctx: gpio_interrupt_handler::Context) { + ctx.shared.delayval.lock(|del| { + *del = *del - 100_u32; + if *del < 200_u32 { + *del = 2000_u32; + } + *del + }); + + ctx.shared.delayval.lock(|del| { + defmt::info!("Current delay value {:?}", del); + }); + + // Obtain the Potentiometer instance that belongs to this task ONLY + let analog_input = &ctx.local.pot_instance.analog_input; + + // Obtain the shared instance of Adc and do one conversion of the value seen + ctx.shared.adc_module.lock(|adc_module| { + let sample = adc_module.convert(analog_input, SampleTime::Cycles_480); + defmt::info!("Current ADC value {:?}\n", sample); + }); + + ctx.local.button.clear_interrupt_pending_bit(); + } +}