From 4e92dceed815d00a5492c5606ce7d863606d6507 Mon Sep 17 00:00:00 2001
From: Danny <nooges@users.noreply.github.com>
Date: Sat, 24 Mar 2018 12:50:44 -0400
Subject: Add Fourier Keyboard (#2596)

* Initial commit of Fourier keyboard

* Revise keymap, add key to bottom row

* Fix readme
---
 keyboards/fourier/split_util.c | 80 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 keyboards/fourier/split_util.c

(limited to 'keyboards/fourier/split_util.c')

diff --git a/keyboards/fourier/split_util.c b/keyboards/fourier/split_util.c
new file mode 100644
index 0000000000..2704e30e04
--- /dev/null
+++ b/keyboards/fourier/split_util.c
@@ -0,0 +1,80 @@
+#include <avr/io.h>
+#include <avr/wdt.h>
+#include <avr/power.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include <avr/eeprom.h>
+#include "split_util.h"
+#include "matrix.h"
+#include "keyboard.h"
+#include "config.h"
+#include "timer.h"
+#include "pincontrol.h"
+
+#ifdef USE_I2C
+#  include "i2c.h"
+#else
+#  include "serial.h"
+#endif
+
+volatile bool isLeftHand = true;
+
+static void setup_handedness(void) {
+  // Test D2 pin for handedness, if D2 is grounded, it's the right hand
+  pinMode(D2, PinDirectionInput);
+  isLeftHand = digitalRead(D2);
+}
+
+static void keyboard_master_setup(void) {
+#ifdef USE_I2C
+    i2c_master_init();
+#ifdef SSD1306OLED
+    matrix_master_OLED_init();
+#endif
+#else
+    serial_master_init();
+#endif
+}
+
+static void keyboard_slave_setup(void) {
+  timer_init();
+#ifdef USE_I2C
+    i2c_slave_init(SLAVE_I2C_ADDRESS);
+#else
+    serial_slave_init();
+#endif
+}
+
+bool has_usb(void) {
+   USBCON |= (1 << OTGPADE); //enables VBUS pad
+   _delay_us(5);
+   return (USBSTA & (1<<VBUS));  //checks state of VBUS
+}
+
+void split_keyboard_setup(void) {
+   setup_handedness();
+
+   if (has_usb()) {
+      keyboard_master_setup();
+   } else {
+      keyboard_slave_setup();
+   }
+   sei();
+}
+
+void keyboard_slave_loop(void) {
+   matrix_init();
+
+   while (1) {
+      matrix_slave_scan();
+   }
+}
+
+// this code runs before the usb and keyboard is initialized
+void matrix_setup(void) {
+    split_keyboard_setup();
+
+    if (!has_usb()) {
+        keyboard_slave_loop();
+    }
+}
-- 
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