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Add data flush in uart put function

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Alex Chi 2020-02-03 10:33:00 +08:00 committed by GitHub
parent e8e379e557
commit 2474df886c
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1 changed files with 7 additions and 0 deletions
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7
risc_v/ch6/src/uart.rs
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@ -101,7 +101,14 @@ impl Uart {
pub fn put(&mut self, c: u8) {
let ptr = self.base_address as *mut u8;
loop {
// Wait until previous data is flushed
if unsafe { ptr.add(5).read_volatile() } & (1 << 5) != 0 {
break;
}
}
unsafe {
// Write data
ptr.add(0).write_volatile(c);
}
}