/* * Copyright 2020 Richard Titmuss (richard.titmuss@gmail.com) * Copyright 2012-2018 Jun Wako, Jack Humbert, Yiancar * * 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 "i2c_master.h" #include "mcp23018.h" #define MCP23018_ADDR 0b0100000 #define MCP23018_TIMEOUT 100 static i2c_status_t mcp23018_status = I2C_STATUS_ERROR; void msp23018_init(void) { mcp23018_status = I2C_STATUS_SUCCESS; // Set pin direction uint8_t iodir[] = {0b00001111, 0b11111111}; mcp23018_writeReg(IODIRA, iodir, 2); // Set pull-up uint8_t gppu[] = {0b00001111, 0b11111000}; mcp23018_writeReg(GPPUA, gppu, 2); // LEDs output high uint8_t gpio[] = {0b00000000, 0b00000111}; mcp23018_writeReg(GPIOA, gpio, 2); } bool mcp23018_reset_required(void) { return mcp23018_status != I2C_STATUS_SUCCESS; } i2c_status_t mcp23018_writeReg(uint8_t regaddr, const uint8_t* data, uint16_t length) { if (mcp23018_status) { return mcp23018_status; } mcp23018_status = i2c_writeReg((MCP23018_ADDR << 1), regaddr, data, length, MCP23018_TIMEOUT); return mcp23018_status; } i2c_status_t mcp23018_readReg(uint8_t regaddr, uint8_t* data, uint16_t length) { if (mcp23018_status) { return mcp23018_status; } mcp23018_status = i2c_readReg((MCP23018_ADDR << 1), regaddr, data, length, MCP23018_TIMEOUT); return mcp23018_status; }