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zynq-rs
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stdio::drop_uart(): add delay

This commit is contained in:
Astro 2020-08-17 19:38:41 +02:00
parent 64db9b0142
commit b268fe015a
1 changed files with 9 additions and 1 deletions
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10
libboard_zynq/src/stdio.rs
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@ -1,5 +1,5 @@
use core::ops::{Deref, DerefMut}; use core::ops::{Deref, DerefMut};
use libcortex_a9::mutex::{Mutex, MutexGuard}; use libcortex_a9::{asm, mutex::{Mutex, MutexGuard}};
use crate::uart::Uart; use crate::uart::Uart;
const UART_RATE: u32 = 115_200; const UART_RATE: u32 = 115_200;
@ -10,7 +10,15 @@ pub fn get_uart<'a>() -> MutexGuard<'a, LazyUart> {
unsafe { UART.lock() } unsafe { UART.lock() }
} }
/// Deinitialize so that the Uart will be reinitialized on next
/// output.
///
/// Delays so that an outstanding transmission can finish.
pub fn drop_uart() { pub fn drop_uart() {
for _ in 0..1_000_000 {
asm::nop();
}
unsafe { UART = Mutex::new(LazyUart::Uninitialized); } unsafe { UART = Mutex::new(LazyUart::Uninitialized); }
} }