62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/*
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* Copyright 2020 Richard Titmuss (richard.titmuss@gmail.com)
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* Copyright 2012-2018 Jun Wako, Jack Humbert, Yiancar
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "i2c_master.h"
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#include "mcp23018.h"
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#define MCP23018_ADDR 0b0100000
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#define MCP23018_TIMEOUT 100
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static i2c_status_t mcp23018_status = I2C_STATUS_ERROR;
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void msp23018_init(void) {
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mcp23018_status = I2C_STATUS_SUCCESS;
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// Set pin direction
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uint8_t iodir[] = {0b00001111, 0b11111111};
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mcp23018_writeReg(IODIRA, iodir, 2);
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// Set pull-up
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uint8_t gppu[] = {0b00001111, 0b11111000};
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mcp23018_writeReg(GPPUA, gppu, 2);
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// LEDs output high
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uint8_t gpio[] = {0b00000000, 0b00000111};
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mcp23018_writeReg(GPIOA, gpio, 2);
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}
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bool mcp23018_reset_required(void) { return mcp23018_status != I2C_STATUS_SUCCESS; }
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i2c_status_t mcp23018_writeReg(uint8_t regaddr, const uint8_t* data, uint16_t length) {
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if (mcp23018_status) {
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return mcp23018_status;
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}
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mcp23018_status = i2c_writeReg((MCP23018_ADDR << 1), regaddr, data, length, MCP23018_TIMEOUT);
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return mcp23018_status;
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}
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i2c_status_t mcp23018_readReg(uint8_t regaddr, uint8_t* data, uint16_t length) {
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if (mcp23018_status) {
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return mcp23018_status;
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}
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mcp23018_status = i2c_readReg((MCP23018_ADDR << 1), regaddr, data, length, MCP23018_TIMEOUT);
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return mcp23018_status;
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}
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