From 66ee8a34f3bcde31f9d5919f2e0e363ac11f4aca Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Thu, 18 Aug 2022 20:37:09 -0700
Subject: Formatted printing to UART

---
 src/uart.rs | 108 ++++++++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 91 insertions(+), 17 deletions(-)

(limited to 'src/uart.rs')

diff --git a/src/uart.rs b/src/uart.rs
index a26bb2f..ffd9204 100644
--- a/src/uart.rs
+++ b/src/uart.rs
@@ -1,4 +1,5 @@
 use crate::cpu::*;
+
 const UART0_DR: u32    = 0x3F201000;
 const UART0_FR: u32    = 0x3F201018;
 const UART0_CR: u32    = 0x3F201030;
@@ -10,24 +11,97 @@ const UART0_IMSC: u32  = 0x3F201038;
 const GPPUD: u32       = 0x3F200094;
 const GPPUDCLK0: u32   = 0x3F200098;
 
-pub fn uart_init() {
-	store32(UART0_CR, 0);
-	store32(GPPUD, 0);
-	spin_for_n_cycles(150);
-	store32(GPPUDCLK0, (1 << 14) | (1 << 15));
-	spin_for_n_cycles(150);
-	store32(GPPUDCLK0, 0);
-	store32(UART0_ICR, 0x7FF);
-	store32(UART0_IBRD, 9);
-	store32(UART0_FBRD, 49);
-	store32(UART0_LCRH, (1<<4) | (1<<5) | (1<<6));
-	store32(UART0_IMSC, (1<<1) | (1<<4) | (1<<5) | (1<<6) | (1<<7) | (1<<8) | (1<<9) | (1<<10));
-	store32(UART0_CR, (1<<0) | (1<<8) | (1<<9));
+struct UartInner {
+	chars_written: usize,
+}
+
+use crate::sync::NullLock;
+pub struct Uart {
+	inner: NullLock<UartInner>,
+}
+
+impl UartInner {
+	pub const fn new() -> Self {
+		Self {
+			chars_written: 0,
+		}
+	}
+
+	pub fn init(&mut self) {
+		store32(UART0_CR, 0);
+		store32(GPPUD, 0);
+		spin_for_n_cycles(150);
+		store32(GPPUDCLK0, (1 << 14) | (1 << 15));
+		spin_for_n_cycles(150);
+		store32(GPPUDCLK0, 0);
+		store32(UART0_ICR, 0x7FF);
+		store32(UART0_IBRD, 9);
+		store32(UART0_FBRD, 49);
+		store32(UART0_LCRH, (1<<4) | (1<<5) | (1<<6));
+		store32(UART0_IMSC, (1<<1) | (1<<4) | (1<<5) | (1<<6) | (1<<7) | (1<<8) | (1<<9) | (1<<10));
+		store32(UART0_CR, (1<<0) | (1<<8) | (1<<9));
+	}
+
+	fn write_char(&mut self, ch: char) {
+		while load32(UART0_FR) & 0x20 != 0 {
+			nop();
+		}
+		store32(UART0_DR, ch as u32);
+		self.chars_written += 1;
+	}
+
+	fn flush(&self) {
+		while load32(UART0_FR) & 0x08 != 0 {
+			nop();
+		}
+	}
+}
+
+use core::fmt;
+impl fmt::Write for UartInner {
+	fn write_str(&mut self, s: &str) -> fmt::Result {
+		for c in s.chars() {
+			self.write_char(c);
+		}
+		Ok(())
+	}
+}
+
+use crate::sync::interface::Mutex;
+
+impl Uart {
+	pub const fn new() -> Self {
+		Self {
+			inner: NullLock::new(UartInner::new()),
+		}
+	}
+
+	pub fn init(&self) -> Result<(), &'static str> {
+		self.inner.lock(|inner| inner.init());
+		Ok(())
+	}
 }
 
-pub fn write_char(ch: u8) {
-	while load32(UART0_FR) & 0x20 != 0 {
-		nop();
+impl super::console::interface::Write for Uart {
+	fn write_char(&self, c: char) {
+		self.inner.lock(|inner| inner.write_char(c));
+	}
+
+	fn write_fmt(&self, args: core::fmt::Arguments) -> fmt::Result {
+		self.inner.lock(|inner| fmt::Write::write_fmt(inner, args))
+	}
+
+	fn flush(&self) {
+		self.inner.lock(|inner| inner.flush());
 	}
-	store32(UART0_DR, ch as u32);
 }
+
+impl super::console::interface::Statistics for Uart {
+	fn chars_written(&self) -> usize {
+		self.inner.lock(|inner| inner.chars_written)
+	}
+}
+
+impl super::console::interface::All for Uart {}
+
+pub static UART_WRITER: Uart = Uart::new();
-- 
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