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uart: make baudrate configurable, run at 115,200 baud

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This commit is contained in:
Astro 2019-05-23 15:50:53 +02:00
parent 15883293ac
commit ea62d4fdec
2 changed files with 13 additions and 8 deletions
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9
src/main.rs
View File

@ -50,10 +50,11 @@ unsafe fn boot_core0() -> ! {
}
fn main() {
let mut uart = Uart::uart1();
writeln!(uart, "Hello World\r").unwrap();
for i in 0.. {
writeln!(uart, "i={}\r", i).unwrap();
let mut uart = Uart::uart1(115_200);
loop {
for i in 0.. {
writeln!(uart, "i={}\r", i);
}
}
let eth = eth::Eth::gem0();

12
src/uart/mod.rs
View File

@ -8,12 +8,16 @@ use crate::regs::*;
mod regs;
mod baud_rate_gen;
/// Determined through experimentation. Actually supposed to be
/// 1 GHz (IO PLL) / 0x14 (slcr.UART_CLK_CTRL[DIVISOR]) = 50 MHz.
const UART_REF_CLK: u32 = 45_000_000;
pub struct Uart {
regs: &'static mut regs::RegisterBlock,
}
impl Uart {
pub fn uart1() -> Self {
pub fn uart1(baudrate: u32) -> Self {
super::slcr::with_slcr(|| {
let uart_rst_ctrl = super::slcr::UartRstCtrl::new();
uart_rst_ctrl.reset_uart1();
@ -36,7 +40,7 @@ impl Uart {
let self_ = Uart {
regs: regs::RegisterBlock::uart1(),
};
self_.configure();
self_.configure(baudrate);
self_
}
@ -49,7 +53,7 @@ impl Uart {
);
}
pub fn configure(&self) {
pub fn configure(&self, baudrate: u32) {
// Configure UART character frame
// * Disable clock-divider
// * 8-bit
@ -67,7 +71,7 @@ impl Uart {
self.disable_rx();
self.disable_tx();
baud_rate_gen::configure(&self.regs, 50_000_000, 9_600);
baud_rate_gen::configure(&self.regs, UART_REF_CLK, baudrate);
// Enable controller
self.reset_rx();