1 files changed, 66 insertions, 0 deletions
diff --git a/keyboards/gergo/gergo.c b/keyboards/gergo/gergo.c
new file mode 100644
index 000000000..c6ba91bb2
--- /dev/null
+++ b/keyboards/gergo/gergo.c
@@ -0,0 +1,66 @@
+#include QMK_KEYBOARD_H
+
+bool i2c_initialized = 0;
+i2c_status_t mcp23018_status = 0x20;
+
+void matrix_init_kb(void) {
+    // (tied to Vcc for hardware convenience)
+    //DDRB  &= ~(1<<4);  // set B(4) as input
+    //PORTB &= ~(1<<4);  // set B(4) internal pull-up disabled
+
+    // unused pins - C7, D4, D5, D7, E6
+    // set as input with internal pull-up enabled
+    DDRC  &= ~(1<<7);
+    DDRD  &= ~(1<<5 | 1<<4 | 1<<6 | 1<<7);
+    DDRE  &= ~(1<<6);
+    PORTC |=  (1<<7);
+    PORTD |=  (1<<5 | 1<<4 | 1<<6 | 1<<7);
+    PORTE |=  (1<<6);
+
+    matrix_init_user();
+}
+
+
+uint8_t init_mcp23018(void) {
+    print("starting init");
+    mcp23018_status = 0x20;
+
+    // I2C subsystem
+
+    // uint8_t sreg_prev;
+    // sreg_prev=SREG;
+    // cli();
+
+    if (i2c_initialized == 0) {
+        i2c_init();  // on pins D(1,0)
+        i2c_initialized = true;
+        _delay_ms(1000);
+    }
+    // i2c_init(); // on pins D(1,0)
+    // _delay_ms(1000);
+
+    // set pin direction
+    // - unused  : input  : 1
+    // - input   : input  : 1
+    // - driving : output : 0
+    mcp23018_status = i2c_start(I2C_ADDR_WRITE, ERGODOX_EZ_I2C_TIMEOUT);    if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(IODIRA, ERGODOX_EZ_I2C_TIMEOUT);            if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(0b10000000, ERGODOX_EZ_I2C_TIMEOUT);        if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(0b11111111, ERGODOX_EZ_I2C_TIMEOUT);        if (mcp23018_status) goto out;
+    i2c_stop(ERGODOX_EZ_I2C_TIMEOUT);
+
+    // set pull-up
+    // - unused  : on  : 1
+    // - input   : on  : 1
+    // - driving : off : 0
+    mcp23018_status = i2c_start(I2C_ADDR_WRITE, ERGODOX_EZ_I2C_TIMEOUT);    if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(GPPUA, ERGODOX_EZ_I2C_TIMEOUT);             if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(0b10000000, ERGODOX_EZ_I2C_TIMEOUT);        if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(0b11111111, ERGODOX_EZ_I2C_TIMEOUT);        if (mcp23018_status) goto out;
+
+out:
+    i2c_stop(ERGODOX_EZ_I2C_TIMEOUT);
+    // SREG=sreg_prev;
+    //uprintf("Init %x\n", mcp23018_status);
+    return mcp23018_status;
+}