From 1b49ec431996196e1a13732f769b56712f905ea7 Mon Sep 17 00:00:00 2001
From: Phil Hagelberg <phil@hagelb.org>
Date: Wed, 3 Jul 2019 20:31:42 -0700
Subject: [PATCH] Add reset.

---
 layout.scm     |  3 +--
 usb_keyboard.c | 11 +++++++++++
 usb_keyboard.h |  4 ++++
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/layout.scm b/layout.scm
index 9b62313..5de6f89 100644
--- a/layout.scm
+++ b/layout.scm
@@ -11,8 +11,7 @@
 (define (set-layer n)
   (lambda () (set! current-layer (vector-ref layers n))))
 
-(define (reset)
-  #f) ;; TODO: uh, seriously. I need this. how.
+(define (reset) (call-c-func "reset"))
 
 ;;;; layers
 
diff --git a/usb_keyboard.c b/usb_keyboard.c
index 3fbe4a6..9dd50ca 100644
--- a/usb_keyboard.c
+++ b/usb_keyboard.c
@@ -601,3 +601,14 @@ ISR(USB_COM_vect)
   }
   UECONX = (1<<STALLRQ) | (1<<EPEN);  // stall
 }
+
+void reset(void) {
+  UDCON = 1; USBCON = (1<<FRZCLK); UCSR1B = 0;
+  // _delay_ms(5);
+  EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
+  TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
+  DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
+  PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
+  *(uint16_t *)0x0800 = 0x7777;
+  wdt_enable(WDTO_120MS);
+};
diff --git a/usb_keyboard.h b/usb_keyboard.h
index 001e8bb..5ae39fc 100644
--- a/usb_keyboard.h
+++ b/usb_keyboard.h
@@ -12,6 +12,10 @@ extern uint8_t keyboard_modifier_keys;
 extern uint8_t keyboard_keys[6];
 extern volatile uint8_t keyboard_leds;
 
+#include <avr/wdt.h>
+// #include <util/delay.h>
+void reset(void);
+
 // This file does not include the HID debug functions, so these empty
 // macros replace them with nothing, so users can compile code that
 // has calls to these functions.