1 // Copyright 2025 The Pigweed Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
5 // the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
13 // the License.
14 #![no_std]
15
16 use embedded_io::Write;
17 use kernel::sync::spinlock::SpinLock;
18 use pw_status::{Error, Result};
19 use rp235x_hal::{
20 gpio::{bank0::Gpio12, bank0::Gpio13, FunctionUart, Pin, PullDown},
21 pac::UART0,
22 uart::{self, UartPeripheral},
23 };
24
25 pub type ConsoleUart = UartPeripheral<
26 uart::Enabled,
27 UART0,
28 (
29 Pin<Gpio12, FunctionUart, PullDown>,
30 Pin<Gpio13, FunctionUart, PullDown>,
31 ),
32 >;
33
34 static UART: SpinLock<Option<ConsoleUart>> = SpinLock::new(None);
35
36 #[no_mangle]
console_backend_write(buf: &[u8]) -> Result<usize>37 pub fn console_backend_write(buf: &[u8]) -> Result<usize> {
38 let mut uart = UART.lock();
39 match &mut (*uart) {
40 Some(uart) => uart.write(buf).map_err(|_| Error::Unknown),
41 None => Ok(buf.len()),
42 }
43 }
44
45 #[no_mangle]
console_backend_flush() -> Result<()>46 pub fn console_backend_flush() -> Result<()> {
47 Ok(())
48 }
49
register_uart(val: ConsoleUart)50 pub fn register_uart(val: ConsoleUart) {
51 let mut uart = UART.lock();
52 *uart = Some(val)
53 }
54