70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
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/* Copyright 2019 Neil Kettle
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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 "sp64.h"
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#ifdef RIGHT_HALF
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bool i2c_initialized = 0;
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i2c_status_t mcp23018_status = I2C_STATUS_ERROR;
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uint8_t init_mcp23018(void)
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{
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uint8_t data[3];
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mcp23018_status = I2C_STATUS_ERROR;
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// I2C subsystem
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if (i2c_initialized == 0) {
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i2c_init(); // on pins D(1,0)
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i2c_initialized = true;
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_delay_ms(1000);
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}
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// set pin direction
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// - unused : input : 1
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// - input : input : 1
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// - driving : output :
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data[0] = IODIRA;
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data[1] = 0b00000000;
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data[2] = 0b11111111;
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mcp23018_status = i2c_transmit(I2C_ADDR_WRITE, (uint8_t *)data, 3, MCP23018_I2C_TIMEOUT);
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if (mcp23018_status != I2C_STATUS_SUCCESS)
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goto out;
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// set pull-up
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// - unused : on : 1
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// - input : on : 1
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// - driving : off : 0
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data[0] = GPPUA;
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data[1] = 0b00000000;
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data[2] = 0b11111111;
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mcp23018_status = i2c_transmit(I2C_ADDR_WRITE, (uint8_t *)data, 3, MCP23018_I2C_TIMEOUT);
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if (mcp23018_status != I2C_STATUS_SUCCESS)
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goto out;
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// set logical value (doesn't matter on inputs)
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// - unused : hi-Z : 1
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// - input : hi-Z : 1
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// - driving : hi-Z : 1
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data[0] = OLATA;
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data[1] = 0b11111111;
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data[2] = 0b11111111;
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mcp23018_status = i2c_transmit(I2C_ADDR_WRITE, (uint8_t *)data, 3, MCP23018_I2C_TIMEOUT);
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out:
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return (mcp23018_status);
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}
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#endif
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