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dd5794c975
* driver should not have hard-coded understanding about I/O directions * board code should pass the I/O direction to driver * board code should use the correct I/O directions (A0..7, B0: output) Change-Id: Id4a8e012a33cee01bb489e612e17920760b9be59
26 lines
1.1 KiB
C
26 lines
1.1 KiB
C
/* mcp23017 i2c gpio expander read and write utilities
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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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
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*/
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#pragma once
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#define MCP23017_ADDRESS 0x20
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int mcp23017_init(uint8_t slave, uint8_t iodira, uint8_t iodirb);
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int mcp23017_test(uint8_t slave);
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int mcp23017_toggle(uint8_t slave);
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//int mcp23017_write_byte(uint8_t slave, uint8_t addr, uint8_t byte);
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//int mcp23017_read_byte(uint8_t slave, uint8_t addr);
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