From ab8c10b82f2a9410570a741a07876829d5ce440d Mon Sep 17 00:00:00 2001 From: Adam Macdonald <72780006+twokilohertz@users.noreply.github.com> Date: Wed, 19 Feb 2025 15:06:48 +0000 Subject: [PATCH] Hello, LED --- .cargo/config.toml | 36 ++++ .gitignore | 2 + Cargo.lock | 509 ++++++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 15 ++ build.rs | 18 ++ memory.x | 77 +++++++ scripts/env-vars.sh | 3 + src/main.rs | 64 ++++++ 8 files changed, 724 insertions(+) create mode 100644 .cargo/config.toml create mode 100644 .gitignore create mode 100644 Cargo.lock create mode 100644 Cargo.toml create mode 100644 build.rs create mode 100644 memory.x create mode 100755 scripts/env-vars.sh create mode 100644 src/main.rs diff --git a/.cargo/config.toml b/.cargo/config.toml new file mode 100644 index 0000000..d5c962f --- /dev/null +++ b/.cargo/config.toml @@ -0,0 +1,36 @@ +[alias] + +build-arm = "build --target=thumbv8m.main-none-eabihf" +build-riscv = "build --target=riscv32imac-unknown-none-elf" + 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mode 100644 index 0000000..05aa1f7 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,15 @@ +[package] +name = "pico-enviro-sensor" +description = "Firmware for RPi Pico 2 W-based environment sensor" +authors = ["Adam Macdonald"] +homepage = "https://github.com/twokilohertz/pico-enviro-sensor" +version = "0.1.0" +edition = "2021" + +[dependencies] +embedded-hal = "1.0.0" +panic-halt = "1.0.0" +rp235x-hal = { version = "0.2.0", features = [ + "critical-section-impl", + "binary-info", +] } diff --git a/build.rs b/build.rs new file mode 100644 index 0000000..6ee2759 --- /dev/null +++ b/build.rs @@ -0,0 +1,18 @@ +use std::fs::File; +use std::io::Write; +use std::path::PathBuf; + +fn main() { + // Put the linker script somewhere the linker can find it + let out = PathBuf::from(std::env::var_os("OUT_DIR").unwrap()); + println!("cargo:rustc-link-search={}", out.display()); + + // The file `memory.x` is loaded by cortex-m-rt's `link.x` script, which + // is what we specify in `.cargo/config.toml` for Arm builds + let memory_x = include_bytes!("memory.x"); + let mut f = File::create(out.join("memory.x")).unwrap(); + f.write_all(memory_x).unwrap(); + println!("cargo:rerun-if-changed=memory.x"); + + println!("cargo:rerun-if-changed=build.rs"); +} diff --git a/memory.x b/memory.x new file mode 100644 index 0000000..7d409ba --- /dev/null +++ b/memory.x @@ -0,0 +1,77 @@ +MEMORY { + /* + * The RP2350 has either external or internal flash. + * + * 2 MiB is a safe default here, although a Pico 2 has 4 MiB. + */ + FLASH : ORIGIN = 0x10000000, LENGTH = 2048K + /* + * RAM consists of 8 banks, SRAM0-SRAM7, with a striped mapping. + * This is usually good for performance, as it distributes load on + * those banks evenly. + */ + RAM : ORIGIN = 0x20000000, LENGTH = 512K + /* + * RAM banks 8 and 9 use a direct mapping. They can be used to have + * memory areas dedicated for some specific job, improving predictability + * of access times. + * Example: Separate stacks for core0 and core1. + */ + SRAM4 : ORIGIN = 0x20080000, LENGTH = 4K + SRAM5 : ORIGIN = 0x20081000, LENGTH = 4K +} + +SECTIONS { + /* ### Boot ROM info + * + * Goes after .vector_table, to keep it in the first 4K of flash + * where the Boot ROM (and picotool) can find it + */ + .start_block : ALIGN(4) + { + __start_block_addr = .; + KEEP(*(.start_block)); + KEEP(*(.boot_info)); + } > FLASH + +} INSERT AFTER .vector_table; + +/* move .text to start /after/ the boot info */ +_stext = ADDR(.start_block) + SIZEOF(.start_block); + +SECTIONS { + /* ### Picotool 'Binary Info' Entries + * + * Picotool looks through this block (as we have pointers to it in our + * header) to find interesting information. + */ + .bi_entries : ALIGN(4) + { + /* We put this in the header */ + __bi_entries_start = .; + /* Here are the entries */ + KEEP(*(.bi_entries)); + /* Keep this block a nice round size */ + . = ALIGN(4); + /* We put this in the header */ + __bi_entries_end = .; + } > FLASH +} INSERT AFTER .text; + +SECTIONS { + /* ### Boot ROM extra info + * + * Goes after everything in our program, so it can contain a signature. + */ + .end_block : ALIGN(4) + { + __end_block_addr = .; + KEEP(*(.end_block)); + } > FLASH + +} INSERT AFTER .uninit; + +PROVIDE(start_to_end = __end_block_addr - __start_block_addr); +PROVIDE(end_to_start = __start_block_addr - __end_block_addr); + + diff --git a/scripts/env-vars.sh b/scripts/env-vars.sh new file mode 100755 index 0000000..5ec95df --- /dev/null +++ b/scripts/env-vars.sh @@ -0,0 +1,3 @@ +export PICO_BOARD=pico2_w +export PICO_PLATFORM=rp2350-arm-s +export PICO_SDK_PATH=~/devel/clones/pico-sdk/ diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..5e33c9c --- /dev/null +++ b/src/main.rs @@ -0,0 +1,64 @@ +#![no_std] +#![no_main] + +use panic_halt as _; + +// Alias for our HAL crate +use rp235x_hal as hal; + +// Some things we need +use embedded_hal::delay::DelayNs; +use embedded_hal::digital::OutputPin; + +#[link_section = ".start_block"] +#[used] +pub static IMAGE_DEF: hal::block::ImageDef = hal::block::ImageDef::secure_exe(); + +/// Pico 2 W on-board crystal oscillator frequency (AEL 12.0) +const XTAL_FREQ_HZ: u32 = 12_000_000u32; + +#[hal::entry] +fn main() -> ! { + let mut peripherals = hal::pac::Peripherals::take().unwrap(); + + let mut watchdog = hal::Watchdog::new(peripherals.WATCHDOG); + + let clocks = hal::clocks::init_clocks_and_plls( + XTAL_FREQ_HZ, + peripherals.XOSC, + peripherals.CLOCKS, + peripherals.PLL_SYS, + peripherals.PLL_USB, + &mut peripherals.RESETS, + &mut watchdog, + ) + .unwrap(); + + let mut timer = hal::Timer::new_timer0(peripherals.TIMER0, &mut peripherals.RESETS, &clocks); + + let sio = hal::Sio::new(peripherals.SIO); + + let pins = hal::gpio::Pins::new( + peripherals.IO_BANK0, + peripherals.PADS_BANK0, + sio.gpio_bank0, + &mut peripherals.RESETS, + ); + + let mut led_pin = pins.gpio19.into_push_pull_output(); + loop { + led_pin.set_high().unwrap(); + timer.delay_ms(1000); + led_pin.set_low().unwrap(); + timer.delay_ms(1000); + } +} + +/// Program metadata for `picotool info` +#[link_section = ".bi_entries"] +#[used] +pub static PICOTOOL_ENTRIES: [hal::binary_info::EntryAddr; 3] = [ + hal::binary_info::rp_program_name!(c"Pico Environment Sensor"), + hal::binary_info::rp_cargo_version!(), + hal::binary_info::rp_program_build_attribute!(), +];