mirror of
https://github.com/italicsjenga/rp-hal-boards.git
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369ac5a23f
* Add standalone UART example * Add UART example to docs in UART module * Add core::fmt::write_str to UART module to allow easy use of format! macro in user code
68 lines
1.6 KiB
Rust
68 lines
1.6 KiB
Rust
//! Print an incrementing number to UART0 in a loop
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#![no_std]
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#![no_main]
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use core::fmt::Write;
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use cortex_m_rt::entry;
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use hal::clocks::init_clocks_and_plls;
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use hal::gpio::{self, Pins};
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use hal::pac;
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use hal::sio::Sio;
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use hal::uart::UartPeripheral;
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use hal::watchdog::Watchdog;
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use panic_halt as _;
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use rp2040_hal as hal;
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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;
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#[entry]
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fn main() -> ! {
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let mut pac = pac::Peripherals::take().unwrap();
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let mut watchdog = Watchdog::new(pac.WATCHDOG);
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let sio = Sio::new(pac.SIO);
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// External high-speed crystal on the pico board is 12Mhz
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let external_xtal_freq_hz = 12_000_000u32;
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let clocks = init_clocks_and_plls(
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external_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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let pins = 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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let mut 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::<gpio::FunctionUart>();
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let _rx_pin = pins.gpio1.into_mode::<gpio::FunctionUart>();
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uart.write_full_blocking(b"UART example\r\n");
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let mut value = 0u32;
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loop {
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writeln!(uart, "value: {:02}\r", value).unwrap();
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cortex_m::asm::delay(10_000_000);
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value += 1
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}
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}
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