mirror of
https://github.com/italicsjenga/rp-hal-boards.git
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126 lines
3.8 KiB
Rust
126 lines
3.8 KiB
Rust
//! # ADC Example
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//!
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//! This application demonstrates how to read ADC samples from the temperature
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//! sensor and pin and output them to the UART on pins 1 and 2 at 9600 baud.
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//!
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//! It may need to be adapted to your particular board layout and/or pin assignment.
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//!
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//! See the `Cargo.toml` file for Copyright and licence details.
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#![no_std]
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#![no_main]
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// The macro for our start-up function
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use cortex_m_rt::entry;
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// Ensure we halt the program on panic (if we don't mention this crate it won't
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// be linked)
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use panic_halt as _;
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// Alias for our HAL crate
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use rp2040_hal as hal;
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// Some traits we need
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use core::fmt::Write;
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use embedded_hal::adc::OneShot;
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use embedded_time::fixed_point::FixedPoint;
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use rp2040_hal::clocks::Clock;
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// A shorter alias for the Peripheral Access Crate, which provides low-level
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// register access
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use hal::pac;
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/// The linker will place this boot block at the start of our program image. We
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/// need this to help the ROM bootloader get our code up and running.
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#[link_section = ".boot2"]
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#[used]
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pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
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/// External high-speed crystal on the Raspberry Pi Pico board is 12 MHz. Adjust
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/// if your board has a different frequency
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const XTAL_FREQ_HZ: u32 = 12_000_000u32;
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/// Entry point to our bare-metal application.
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///
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/// The `#[entry]` macro ensures the Cortex-M start-up code calls this function
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/// as soon as all global variables are initialised.
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///
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/// The function configures the RP2040 peripherals, then prints the temperature
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/// in an infinite loop.
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#[entry]
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fn main() -> ! {
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// Grab our singleton objects
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let mut pac = pac::Peripherals::take().unwrap();
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let core = pac::CorePeripherals::take().unwrap();
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// Set up the watchdog driver - needed by the clock setup code
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let mut watchdog = hal::watchdog::Watchdog::new(pac.WATCHDOG);
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// Configure the clocks
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let clocks = hal::clocks::init_clocks_and_plls(
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XTAL_FREQ_HZ,
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pac.XOSC,
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pac.CLOCKS,
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pac.PLL_SYS,
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pac.PLL_USB,
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&mut pac.RESETS,
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&mut watchdog,
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)
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.ok()
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.unwrap();
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// The delay object lets us wait for specified amounts of time (in
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// milliseconds)
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let mut delay = cortex_m::delay::Delay::new(core.SYST, clocks.system_clock.freq().integer());
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// The single-cycle I/O block controls our GPIO pins
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let sio = hal::sio::Sio::new(pac.SIO);
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// Set the pins to their default state
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let pins = hal::gpio::Pins::new(
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pac.IO_BANK0,
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pac.PADS_BANK0,
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sio.gpio_bank0,
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&mut pac.RESETS,
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);
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// Create a UART driver
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let mut uart = hal::uart::UartPeripheral::<_, _>::enable(
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pac.UART0,
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&mut pac.RESETS,
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hal::uart::common_configs::_9600_8_N_1,
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clocks.peripheral_clock.into(),
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)
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.unwrap();
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// UART TX (characters sent from pico) on pin 1 (GPIO0) and RX (on pin 2 (GPIO1)
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let _tx_pin = pins.gpio0.into_mode::<hal::gpio::FunctionUart>();
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let _rx_pin = pins.gpio1.into_mode::<hal::gpio::FunctionUart>();
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// Write to the UART
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uart.write_full_blocking(b"ADC example\r\n");
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// Enable ADC
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let mut adc = hal::adc::Adc::new(pac.ADC, &mut pac.RESETS);
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// Enable the temperature sense channel
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let mut temperature_sensor = adc.enable_temp_sensor();
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// Configure GPIO26 as an ADC input
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let mut adc_pin_0 = pins.gpio26.into_floating_input();
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loop {
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// Read the raw ADC counts from the temperature sensor channel.
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let temp_sens_adc_counts: u16 = adc.read(&mut temperature_sensor).unwrap();
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let pin_adc_counts: u16 = adc.read(&mut adc_pin_0).unwrap();
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writeln!(
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uart,
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"ADC readings: Temperature: {:02} Pin: {:02}\r\n",
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temp_sens_adc_counts, pin_adc_counts
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)
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.unwrap();
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delay.delay_ms(1000);
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}
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}
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// End of file
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