2 files changed, 11 insertions, 12 deletions

diff --git a/sw/eval-clock-cw-tx/src/main.rs b/sw/eval-clock-cw-tx/src/main.rs
index d30318b..a548f81 100644
--- a/sw/eval-clock-cw-tx/src/main.rs
+++ b/sw/eval-clock-cw-tx/src/main.rs
@@ -60,7 +60,7 @@ struct SharedWithISR {
     state : State,
     last_sequence_state_change : u32,
     cw_ptt_timestamp : u32,
-    cw_key_out : gpio::gpioa::PA15<gpio::Output<gpio::PushPull>>,
+    cw_key_out_n : gpio::gpioa::PA15<gpio::Output<gpio::PushPull>>,
     ui : ui::UI,
     cw_pwm: cw::CWPWM,
     cw_keyer: cw::Keyer,
@@ -135,7 +135,7 @@ fn main() -> ! {
     led.set_low().unwrap();
 
     let (pa15, pb3, _pb4) = afio.mapr.disable_jtag(gpioa.pa15, gpiob.pb3, gpiob.pb4);
-    let cw_key_out = pa15.into_push_pull_output_with_state(&mut gpioa.crh, gpio::State::Low);
+    let cw_key_out_n = pa15.into_push_pull_output_with_state(&mut gpioa.crh, gpio::State::High);
     let ptt_out = pb3.into_push_pull_output_with_state(&mut gpiob.crl, gpio::State::Low);
 
     let c1 = gpioa.pa6;
@@ -192,7 +192,7 @@ fn main() -> ! {
             state : State::new(),
             last_sequence_state_change : 0,
             cw_ptt_timestamp : 0,
-            cw_key_out,
+            cw_key_out_n,
             ui,
             cw_pwm,
             cw_keyer : cw::Keyer::new(12, TICKS_PER_SECOND),
@@ -340,16 +340,16 @@ fn TIM2() {
         SequenceState::TxCW => {
             if cw_beep {
                 shared.cw_pwm.on();
-                shared.cw_key_out.set_high().unwrap();
+                shared.cw_key_out_n.set_low().unwrap();
             }
             else {
                 shared.cw_pwm.off();
-                shared.cw_key_out.set_low().unwrap();
+                shared.cw_key_out_n.set_high().unwrap();
             }
         },
         _ => {
             shared.cw_pwm.off();
-            shared.cw_key_out.set_low().unwrap();
+            shared.cw_key_out_n.set_high().unwrap();
         },
     }
 
diff --git a/sw/eval-clock-cw-tx/src/usb.rs b/sw/eval-clock-cw-tx/src/usb.rs
index 941a024..e803c91 100644
--- a/sw/eval-clock-cw-tx/src/usb.rs
+++ b/sw/eval-clock-cw-tx/src/usb.rs
@@ -1,4 +1,4 @@
-
+use core::fmt::Write;
 use stm32f1xx_hal::gpio;
 use stm32f1xx_hal::pac;
 use stm32f1xx_hal::pac::{interrupt, Interrupt};
@@ -74,17 +74,16 @@ fn usb_interrupt() {
     }
 
     let mut buf = [0u8; 8];
+    let mut string = arrayvec::ArrayString::<[_; 16]>::new();
 
     match serial.read(&mut buf) {
         Ok(count) if count > 0 => {
             // Echo back in upper case
             for c in buf[0..count].iter_mut() {
-                if 0x61 <= *c && *c <= 0x7a {
-                    *c &= !0x20;
-                }
+                write!(string, "{:02x}", *c).ok();
             }
-
-            serial.write(&buf[0..count]).ok();
+            serial.write(string.as_bytes()).ok();
+            string.clear();
         }
         _ => {}
     }