From f20a6f8fed823e5406f783b51db96c07ee14f079 Mon Sep 17 00:00:00 2001
From: Alon Swartz <alon@turnkeylinux.org>
Date: Sat, 15 Apr 2017 22:37:00 +0300
Subject: [PATCH] blackhawk: enabled trackpoint (usart: D2 data, D5 clk)

---
 keyboard/blackhawk/Makefile |  4 ++++
 keyboard/blackhawk/config.h | 46 +++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)

diff --git a/keyboard/blackhawk/Makefile b/keyboard/blackhawk/Makefile
index 18cc800f8c..9543774f3d 100644
--- a/keyboard/blackhawk/Makefile
+++ b/keyboard/blackhawk/Makefile
@@ -122,6 +122,9 @@ COMMAND_ENABLE = yes    # Commands for debug and configuration
 #SLEEP_LED_ENABLE = yes  # Breathing sleep LED during USB suspend
 #NKRO_ENABLE = yes       # USB Nkey Rollover - not yet supported in LUFA
 
+PS2_MOUSE_ENABLE = yes  # PS/2 mouse(TrackPoint) support
+PS2_USE_USART = yes     # hardware USART engine for PS/2 signal receive
+#PS2_MOUSE_DEBUG = yes
 
 # Optimize size but this may cause error "relocation truncated to fit"
 #EXTRALDFLAGS = -Wl,--relax
@@ -131,5 +134,6 @@ VPATH += $(TARGET_DIR)
 VPATH += $(TMK_DIR)
 
 include $(TMK_DIR)/protocol/lufa.mk
+include $(TMK_DIR)/protocol.mk      # Enables PS/2 Trackpoint
 include $(TMK_DIR)/common.mk
 include $(TMK_DIR)/rules.mk
diff --git a/keyboard/blackhawk/config.h b/keyboard/blackhawk/config.h
index 40deee91bf..785b8394a5 100644
--- a/keyboard/blackhawk/config.h
+++ b/keyboard/blackhawk/config.h
@@ -48,6 +48,52 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 )
 
 
+/* PS/2 mouse USART version */
+#ifdef PS2_USE_USART
+#if defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)
+/* XCK for clock line and RXD for data line */
+#define PS2_CLOCK_PORT  PORTD
+#define PS2_CLOCK_PIN   PIND
+#define PS2_CLOCK_DDR   DDRD
+#define PS2_CLOCK_BIT   5
+#define PS2_DATA_PORT   PORTD
+#define PS2_DATA_PIN    PIND
+#define PS2_DATA_DDR    DDRD
+#define PS2_DATA_BIT    2
+
+/* synchronous, odd parity, 1-bit stop, 8-bit data, sample at falling edge */
+/* set DDR of CLOCK as input to be slave */
+#define PS2_USART_INIT() do {   \
+    PS2_CLOCK_DDR &= ~(1<<PS2_CLOCK_BIT);   \
+    PS2_DATA_DDR &= ~(1<<PS2_DATA_BIT);     \
+    UCSR1C = ((1 << UMSEL10) |  \
+              (3 << UPM10)   |  \
+              (0 << USBS1)   |  \
+              (3 << UCSZ10)  |  \
+              (0 << UCPOL1));   \
+    UCSR1A = 0;                 \
+    UBRR1H = 0;                 \
+    UBRR1L = 0;                 \
+} while (0)
+#define PS2_USART_RX_INT_ON() do {  \
+    UCSR1B = ((1 << RXCIE1) |       \
+              (1 << RXEN1));        \
+} while (0)
+#define PS2_USART_RX_POLL_ON() do { \
+    UCSR1B = (1 << RXEN1);          \
+} while (0)
+#define PS2_USART_OFF() do {    \
+    UCSR1C = 0;                 \
+    UCSR1B &= ~((1 << RXEN1) |  \
+                (1 << TXEN1));  \
+} while (0)
+#define PS2_USART_RX_READY      (UCSR1A & (1<<RXC1))
+#define PS2_USART_RX_DATA       UDR1
+#define PS2_USART_ERROR         (UCSR1A & ((1<<FE1) | (1<<DOR1) | (1<<UPE1)))
+#define PS2_USART_RX_VECT       USART1_RX_vect
+#endif
+
+#endif
 
 /*
  * Feature disable options