49 lines
1.4 KiB
Rust
49 lines
1.4 KiB
Rust
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//! UART example application. Sends a test string over a UART and then enters
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//! echo mode
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#![no_main]
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#![no_std]
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use cortex_m_rt::entry;
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use embedded_io::{Read, Write};
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use panic_rtt_target as _;
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use rtt_target::{rprintln, rtt_init_print};
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use va416xx_hal::time::{Hertz, MegaHertz};
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use va416xx_hal::{gpio::PinsG, pac, uart};
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#[entry]
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fn main() -> ! {
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rtt_init_print!();
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rprintln!("-- VA416xx UART example application--");
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// SAFETY: Peripherals are only stolen once here.
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let mut dp = unsafe { pac::Peripherals::steal() };
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let gpiob = PinsG::new(&mut dp.sysconfig, Some(dp.ioconfig), dp.portg);
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let tx = gpiob.pg0.into_funsel_1();
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let rx = gpiob.pg1.into_funsel_1();
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let uartb = uart::Uart::uart0(
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dp.uart0,
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(tx, rx),
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Hertz::from_raw(115200),
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&mut dp.sysconfig,
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Hertz::from_raw(MegaHertz::from_raw(20).to_Hz()),
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);
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let (mut tx, mut rx) = uartb.split();
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let mut recv_buf: [u8; 32] = [0; 32];
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writeln!(tx, "Hello World").unwrap();
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loop {
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// Echo what is received on the serial link.
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match rx.read(&mut recv_buf) {
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Ok(recvd) => {
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if let Err(e) = tx.write(&recv_buf[0..recvd]) {
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rprintln!("UART TX error: {:?}", e);
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}
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}
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Err(e) => {
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rprintln!("UART RX error {:?}", e);
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}
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}
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}
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}
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