mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
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3fc502854a
- Add // comments to mod declarations, use imports, static items, and PICOTOOL_ENTRIES in all 8 main.rs files matching rp-hal template style - Add //! file headers to all 8 board.rs files - Add // comments to all board.rs use imports and HAL alias - All 8 drivers build successfully, all 75 tests pass
130 lines
4.7 KiB
Rust
130 lines
4.7 KiB
Rust
//! @file main.rs
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//! @brief PWM demonstration: LED breathing effect via duty-cycle sweep
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//! @author Kevin Thomas
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//! @date 2025
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//!
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//! MIT License
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//!
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//! Copyright (c) 2025 Kevin Thomas
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//!
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//! Permission is hereby granted, free of charge, to any person obtaining a copy
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//! of this software and associated documentation files (the "Software"), to deal
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//! in the Software without restriction, including without limitation the rights
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//! to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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//! copies of the Software, and to permit persons to whom the Software is
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//! furnished to do so, subject to the following conditions:
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//!
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//! The above copyright notice and this permission notice shall be included in
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//! all copies or substantial portions of the Software.
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//!
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//! THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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//! IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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//! FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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//! AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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//! LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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//! OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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//! SOFTWARE.
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//!
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//! -----------------------------------------------------------------------------
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//!
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//! Demonstrates PWM output using the pwm driver (pwm.rs). A 1 kHz
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//! signal on GPIO 25 (onboard LED) sweeps its duty cycle from 0% to 100%
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//! and back to produce a smooth breathing effect. The current duty is
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//! reported over UART at 115200 baud.
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//!
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//! Wiring:
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//! GPIO0 -> UART TX (USB-to-UART adapter RX)
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//! GPIO1 -> UART RX (USB-to-UART adapter TX)
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//! GPIO25 -> Onboard LED (no external wiring needed)
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#![no_std]
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#![no_main]
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// Board-level helpers: constants, type aliases, and init functions
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mod board;
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// PWM driver module — suppress warnings for unused public API functions
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#[allow(dead_code)]
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mod pwm;
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// Debugging output over RTT
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use defmt_rtt as _;
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// Panic handler for RISC-V targets
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#[cfg(target_arch = "riscv32")]
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use panic_halt as _;
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// Panic handler for ARM targets
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#[cfg(target_arch = "arm")]
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use panic_probe as _;
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// Clock trait for accessing system clock frequency
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use hal::Clock;
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// HAL entry-point macro
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use hal::entry;
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// Alias our HAL crate
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#[cfg(rp2350)]
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use rp235x_hal as hal;
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#[cfg(rp2040)]
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use rp2040_hal as hal;
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// Second-stage boot loader for RP2040
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#[unsafe(link_section = ".boot2")]
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#[used]
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#[cfg(rp2040)]
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pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
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// Boot metadata for the RP2350 Boot ROM
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#[unsafe(link_section = ".start_block")]
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#[used]
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#[cfg(rp2350)]
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pub static IMAGE_DEF: hal::block::ImageDef = hal::block::ImageDef::secure_exe();
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/// Application entry point for the PWM LED breathing demo.
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///
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/// Initializes PWM at 1 kHz on the onboard LED and enters an infinite
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/// loop that sweeps the duty cycle up and down to produce a smooth
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/// breathing effect, reporting each step over UART.
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///
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/// # Returns
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///
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/// Does not return.
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#[entry]
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fn main() -> ! {
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let mut pac = hal::pac::Peripherals::take().unwrap();
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let clocks = board::init_clocks(
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pac.XOSC, pac.CLOCKS, pac.PLL_SYS, pac.PLL_USB, &mut pac.RESETS,
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&mut hal::Watchdog::new(pac.WATCHDOG),
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);
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let pins = board::init_pins(pac.IO_BANK0, pac.PADS_BANK0, pac.SIO, &mut pac.RESETS);
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let uart = board::init_uart(pac.UART0, pins.gpio0, pins.gpio1, &mut pac.RESETS, &clocks);
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let mut delay = board::init_delay(&clocks);
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uart.write_full_blocking(b"PWM initialized: GPIO25 @ 1000 Hz\r\n");
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let pwm_slices = hal::pwm::Slices::new(pac.PWM, &mut pac.RESETS);
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let mut pwm_slice = pwm_slices.pwm4;
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let sys_hz = clocks.system_clock.freq().to_Hz();
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let div = pwm::calc_clk_div(sys_hz, board::PWM_FREQ_HZ, board::PWM_WRAP);
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let div_int = div as u8;
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pwm_slice.set_div_int(div_int);
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pwm_slice.set_div_frac((((div - div_int as f32) * 16.0) as u8).min(15));
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pwm_slice.set_top(board::PWM_WRAP as u16);
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pwm_slice.enable();
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pwm_slice.channel_b.output_to(pins.gpio25);
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let mut buf = [0u8; 16];
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loop {
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board::sweep_up(&uart, &mut pwm_slice.channel_b, &mut delay, &mut buf);
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board::sweep_down(&uart, &mut pwm_slice.channel_b, &mut delay, &mut buf);
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}
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}
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// Picotool binary info metadata
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#[unsafe(link_section = ".bi_entries")]
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#[used]
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pub static PICOTOOL_ENTRIES: [hal::binary_info::EntryAddr; 5] = [
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hal::binary_info::rp_cargo_bin_name!(),
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hal::binary_info::rp_cargo_version!(),
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hal::binary_info::rp_program_description!(c"PWM LED Breathing Demo"),
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hal::binary_info::rp_cargo_homepage_url!(),
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hal::binary_info::rp_program_build_attribute!(),
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];
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// End of file
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