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Enhance the serial driver

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Typo fixes
Add an easy way to compute the baud rate
This commit is contained in:
guillaume didier 2020-02-17 13:35:53 +01:00
parent 81a517de6b
commit fcc27d50e3
1 changed files with 10 additions and 4 deletions
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14
polling_serial/src/lib.rs
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@ -40,13 +40,15 @@ pub struct SerialPort {
scratch: Port<u8>, // 7 scratch: Port<u8>, // 7
} }
const SCRATCH_VALUE: u8 = 0x42; const SCRATCH_VALUE: u8 = 0x42; // An arbitrary value used to test serial ports
const DISBALE_INTERRUPTS: u8 = 0x00; const DISABLE_INTERRUPTS: u8 = 0x00; //
const DLAB: u8 = 0x80; const DLAB: u8 = 0x80;
const DIVISOR: u16 = 0x03; const BASE_RATE: u32 = 115200;
const DIVISOR: u16 = 0x03; // The baud rate is 38400
const PARITY_MODE: u8 = 0x03; const PARITY_MODE: u8 = 0x03;
@ -81,7 +83,7 @@ impl SerialPort {
} }
// disable all interrupts // disable all interrupts
p.int_en.write(DISBALE_INTERRUPTS); p.int_en.write(DISABLE_INTERRUPTS);
// enable DLAB to set the divisor // enable DLAB to set the divisor
p.line_ctrl.write(DLAB); p.line_ctrl.write(DLAB);
@ -126,6 +128,10 @@ impl SerialPort {
self.data.read() self.data.read()
} }
} }
pub fn rate() -> u32 {
BASE_RATE / (DIVISOR as u32)
}
} }
impl fmt::Write for SerialPort { impl fmt::Write for SerialPort {