33 lines
963 B
Rust
33 lines
963 B
Rust
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//! This module provides access to the UART console.
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/// Represents an initialised UART device.
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pub struct Device {
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base: usize,
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}
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impl Device {
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/// Create a new UART device.
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/// # Safety
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/// `base` must be the base address of a UART device.
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pub unsafe fn new(base: usize) -> Self {
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use core::ptr::write_volatile;
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let addr = base as *mut u8;
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// Set data size to 8 bits.
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unsafe { write_volatile(addr.offset(3), 0b11) };
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// Enable FIFO.
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unsafe { write_volatile(addr.offset(2), 0b1) };
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// Enable receiver buffer interrupts.
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unsafe { write_volatile(addr.offset(1), 0b1) };
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// Return a new, initialised UART device.
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Device { base }
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}
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pub fn put(&mut self, character: u8) {
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let ptr = self.base as *mut u8;
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// UNSAFE: fine as long as self.base is valid
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unsafe {
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core::ptr::write_volatile(ptr, character);
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}
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}
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}
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