[Keyboard] Added ymdk split64 based on walston's work (#9183)

* Added ymdk split64 based on walson's work

* Commented out features on walston's keymap as it was too big to compile

* Update keyboards/ymdk_sp64/config.h

* Update keyboards/ymdk_sp64/keymaps/daed/keymap.c

* Update keyboards/ymdk_sp64/matrix.c

* Update keyboards/ymdk_sp64/matrix.c

* Update keyboards/ymdk_sp64/matrix.c

* keymap changes

* Update keyboards/ymdk_sp64/matrix.c

* Update keyboards/ymdk_sp64/matrix.c

* Update keyboards/ymdk_sp64/rules.mk

* Update keyboards/ymdk_sp64/config.h

* Update keyboards/ymdk_sp64/config.h

* Update keyboards/ymdk_sp64/readme.md

* Update keyboards/ymdk_sp64/rules.mk

* Update keyboards/ymdk_sp64/config.h

* Update keyboards/ymdk_sp64/rules.mk

* Update keyboards/ymdk_sp64/ymdk_sp64.c

* Update keyboards/ymdk_sp64/keymaps/walston/rules.mk

* Update keyboards/ymdk_sp64/readme.md

* Made requested changes and moved keyboard under ymdk directory

* Update keyboards/ymdk/ymdk_sp64/keymaps/walston/keymap.c

* Update keyboards/ymdk/ymdk_sp64/config.h

* Update keyboards/ymdk/ymdk_sp64/config.h

* Update keyboards/ymdk/ymdk_sp64/keymaps/default/keymap.c

* Update keyboards/ymdk/ymdk_sp64/keymaps/default/keymap.c

* updated changes for pr 9183

* updated changes for pr 9183

* updated changes for pr 9183

* Removed redundant "QMK_KEYBOARD_H" include

1 files changed, 93 insertions, 0 deletions

diff --git a/keyboards/ymdk/sp64/sp64.c b/keyboards/ymdk/sp64/sp64.c
new file mode 100644
index 0000000000..568735ad75
--- /dev/null
+++ b/keyboards/ymdk/sp64/sp64.c
@@ -0,0 +1,93 @@
+/* Copyright 2019 Neil Kettle
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "sp64.h"
+
+#ifdef RIGHT_HALF
+bool i2c_initialized = 0;
+i2c_status_t mcp23018_status = I2C_STATUS_ERROR;
+
+uint8_t init_mcp23018(void)
+{
+  uint8_t data[3];
+  mcp23018_status = I2C_STATUS_ERROR;
+
+  // I2C subsystem
+  if (i2c_initialized == 0) {
+    i2c_init();  // on pins D(1,0)
+    i2c_initialized = true;
+    _delay_ms(1000);
+  }
+
+  // set pin direction
+  // - unused  : input  : 1
+  // - input   : input  : 1
+  // - driving : output :
+  data[0] = IODIRA;
+  data[1] = 0b00000000;
+  data[2] = 0b11111111;
+  mcp23018_status = i2c_transmit(I2C_ADDR_WRITE, (uint8_t *)data, 3, MCP23018_I2C_TIMEOUT);
+  if (mcp23018_status != I2C_STATUS_SUCCESS)
+    goto out;
+
+  // set pull-up
+  // - unused  : on  : 1
+  // - input   : on  : 1
+  // - driving : off : 0
+  data[0] = GPPUA;
+  data[1] = 0b00000000;
+  data[2] = 0b11111111;
+  mcp23018_status = i2c_transmit(I2C_ADDR_WRITE, (uint8_t *)data, 3, MCP23018_I2C_TIMEOUT);
+  if (mcp23018_status != I2C_STATUS_SUCCESS)
+    goto out;
+
+  //  set logical value (doesn't matter on inputs)
+  // - unused  : hi-Z : 1
+  // - input   : hi-Z : 1
+  // - driving : hi-Z : 1
+  data[0] = OLATA;
+  data[1] = 0b11111111;
+  data[2] = 0b11111111;
+  mcp23018_status = i2c_transmit(I2C_ADDR_WRITE, (uint8_t *)data, 3, MCP23018_I2C_TIMEOUT);
+
+out:
+  return (mcp23018_status);
+}
+#endif
+
+// Optional override functions below.
+// You can leave any or all of these undefined.
+// These are only required if you want to perform custom actions.
+
+__attribute__ ((weak))
+void matrix_init_user(void) {}
+
+void matrix_init_kb(void) {
+    // put your keyboard start-up code here
+    // runs once when the firmware starts up
+
+    matrix_init_user();
+}
+
+__attribute__ ((weak))
+void matrix_scan_user(void) {}
+
+void matrix_scan_kb(void) {
+    // put your looping keyboard code here
+    // runs every cycle (a lot)
+
+    matrix_scan_user();
+}