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/*
* 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_write_register((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_read_register((MCP23018_ADDR << 1), regaddr, data, length, MCP23018_TIMEOUT);
return mcp23018_status;
}
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