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/* Copyright 2019 Neil Kettle
*
* 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 "sp64.h"
#ifdef RIGHT_HALF
bool i2c_initialized = 0;
i2c_status_t mcp23018_status = I2C_STATUS_ERROR;
uint8_t init_mcp23018(void)
{
uint8_t data[3];
mcp23018_status = I2C_STATUS_ERROR;
// I2C subsystem
if (i2c_initialized == 0) {
i2c_init(); // on pins D(1,0)
i2c_initialized = true;
_delay_ms(1000);
}
// set pin direction
// - unused : input : 1
// - input : input : 1
// - driving : output :
data[0] = IODIRA;
data[1] = 0b00000000;
data[2] = 0b11111111;
mcp23018_status = i2c_transmit(I2C_ADDR, (uint8_t *)data, 3, MCP23018_I2C_TIMEOUT);
if (mcp23018_status != I2C_STATUS_SUCCESS)
goto out;
// set pull-up
// - unused : on : 1
// - input : on : 1
// - driving : off : 0
data[0] = GPPUA;
data[1] = 0b00000000;
data[2] = 0b11111111;
mcp23018_status = i2c_transmit(I2C_ADDR, (uint8_t *)data, 3, MCP23018_I2C_TIMEOUT);
if (mcp23018_status != I2C_STATUS_SUCCESS)
goto out;
// set logical value (doesn't matter on inputs)
// - unused : hi-Z : 1
// - input : hi-Z : 1
// - driving : hi-Z : 1
data[0] = OLATA;
data[1] = 0b11111111;
data[2] = 0b11111111;
mcp23018_status = i2c_transmit(I2C_ADDR, (uint8_t *)data, 3, MCP23018_I2C_TIMEOUT);
out:
return (mcp23018_status);
}
#endif
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