From 93a52f6452cf322bddac2edd8d279b375d8f8ac0 Mon Sep 17 00:00:00 2001
From: Brian Cully <bjc@kublai.com>
Date: Fri, 9 Aug 2019 19:48:52 -0400
Subject: =?UTF-8?q?Send=20keyboard=20reports=20over=20I=C2=B2C.?=
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---
 src/main.rs | 34 ++++++++++++++++++++++------------
 1 file changed, 22 insertions(+), 12 deletions(-)
 mode change 100755 => 100644 src/main.rs

diff --git a/src/main.rs b/src/main.rs
old mode 100755
new mode 100644
index a89ac07..a7cfd8a
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,5 @@
+//! Take USB keyboard reports and echo them over I²C.
+
 #![no_std]
 #![no_main]
 
@@ -28,11 +30,14 @@ use trinket_m0::{
 };
 use usb_host::Driver;
 
+// A very unsafe copy of an LED to turn on when things go really, really wrong.
 static mut LED: usize = 0;
 
-static HANDLERS: HandlerArray = HandlerArray::new();
+// I²C address to send keyboard reports to.
+const NRF_WIREADDR: u8 = 4;
 
-const NRF_WIREADDR: u8 = 10;
+// Interrupt handler table.
+static HANDLERS: HandlerArray = HandlerArray::new();
 
 #[entry]
 fn main() -> ! {
@@ -101,7 +106,7 @@ fn main() -> ! {
         Pa10<Output<OpenDrain>>,
     > = unsafe { mem::transmute(&logger) };
     unsafe { log::set_logger_racy(logger_ref).expect("couldn't set logger") };
-    log::set_max_level(LevelFilter::Trace);
+    log::set_max_level(LevelFilter::Info);
 
     let mut rtc_handler = rtc::setup(dp.RTC, &mut clocks);
 
@@ -117,7 +122,12 @@ fn main() -> ! {
         &rtc::millis,
     );
 
-    let mut bootkbd = BootKeyboard::new();
+    let mut bootkbd = BootKeyboard::new(|addr, buf| {
+        info!("{}: {:?}", addr, buf);
+        let hdr: [u8; 2] = [I2CMessageType::Keyboard as u8, buf.len() as u8];
+        i2c_master.write(NRF_WIREADDR, &hdr).ok();
+        i2c_master.write(NRF_WIREADDR, &buf).ok();
+    });
     let mut drivers: [&mut dyn Driver; 1] = [&mut bootkbd];
 
     HANDLERS.with_overrides(|hs| {
@@ -131,15 +141,7 @@ fn main() -> ! {
 
         info!("Bootstrap complete.");
 
-        let mut last_tick = 0;
         loop {
-            let tick = rtc::millis();
-            if tick >= last_tick + 1000 {
-                last_tick = tick;
-                let t: [u8; 4] = unsafe { core::mem::transmute(tick) };
-                i2c_master.write(NRF_WIREADDR, &t).ok();
-            }
-
             usb_host.task(&mut drivers[..]);
             wfi()
         }
@@ -147,6 +149,14 @@ fn main() -> ! {
     unreachable!();
 }
 
+#[allow(unused)]
+#[repr(u8)]
+enum I2CMessageType {
+    Debug = 0x00,
+    Keyboard = 0x01,
+    Invalid = 0xff,
+}
+
 #[panic_handler]
 fn panic_handler(pi: &PanicInfo) -> ! {
     let red_led: &mut Pa10<Output<OpenDrain>> = unsafe { mem::transmute(LED) };
-- 
cgit v1.2.3