qmk-firmware/keyboards/sx60/sx60.c

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#include "sx60.h"
#include "i2cmaster.h"
bool i2c_initialized = 0;
uint8_t mcp23018_status = 0x20;
uint8_t init_mcp23018(void) {
mcp23018_status = 0x20;
/* I2C subsystem */
if (i2c_initialized == 0) {
i2c_init(); // on pins D(1,0)
i2c_initialized = true;
_delay_ms(1000);
}
/* B Pins are Row, A pins are Columns
Set them to output */
mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out;
mcp23018_status = i2c_write(IODIRA); if (mcp23018_status) goto out;
mcp23018_status = i2c_write(0b11111111); if (mcp23018_status) goto out;
/* Now write to IODIRB */
mcp23018_status = i2c_write(0b00000000); if (mcp23018_status) goto out;
i2c_stop();
mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out;
mcp23018_status = i2c_write(GPPUA); if (mcp23018_status) goto out;
mcp23018_status = i2c_write(0b11111111); if (mcp23018_status) goto out;
/* Now write to GPPUB */
mcp23018_status = i2c_write(0b00000000); if (mcp23018_status) goto out;
out:
i2c_stop();
return mcp23018_status;
}