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Merge pull request #13 from skyzh/patch-1

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Add data flush in uart put function
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Stephen Marz 2020-02-22 08:58:52 -05:00 committed by GitHub
commit a36db7e8aa
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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) { pub fn put(&mut self, c: u8) {
let ptr = self.base_address as *mut 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 { unsafe {
// Write data
ptr.add(0).write_volatile(c); ptr.add(0).write_volatile(c);
} }
} }