mac-rom-simm-programmer/drivers/mcp23s17.h
Doug Brown 2e4e303c0c Change license to GPLv3
I can't use GPLv2 as soon as I need to start using the Nuvoton sample
code which is licensed with an Apache 2.0 license.
2023-06-25 11:41:18 -07:00

76 lines
2.5 KiB
C

/*
* mcp23s17.h
*
* Created on: Nov 25, 2011
* Author: Doug
*
* Copyright (C) 2011-2023 Doug Brown
*
* 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 3 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 <https://www.gnu.org/licenses/>.
*
*/
#ifndef DRIVERS_MCP23S17_H_
#define DRIVERS_MCP23S17_H_
#include "../hal/spi.h"
/// A few register defines. Ordinarily I wouldn't put these in the header file
/// because users of this module shouldn't care...but I have had to do some
/// optimizations with the AVR to bypass the hardware abstraction layer.
#define MCP23S17_CONTROL_WRITE(address) (0x40 | (address << 1))
#define MCP23S17_CONTROL_READ(address) (0x40 | (address << 1) | 1)
#define MCP23S17_IODIRA 0x00
#define MCP23S17_IODIRB 0x01
#define MCP23S17_IPOLA 0x02
#define MCP23S17_IPOLB 0x03
#define MCP23S17_GPINTENA 0x04
#define MCP23S17_GPINTENB 0x05
#define MCP23S17_DEFVALA 0x06
#define MCP23S17_DEFVALB 0x07
#define MCP23S17_INTCONA 0x08
#define MCP23S17_INTCONB 0x09
#define MCP23S17_IOCON 0x0A
#define MCP23S17_IOCON_AGAIN 0x0B
#define MCP23S17_GPPUA 0x0C
#define MCP23S17_GPPUB 0x0D
#define MCP23S17_INTFA 0x0E
#define MCP23S17_INTFB 0x0F
#define MCP23S17_INTCAPA 0x10
#define MCP23S17_INTCAPB 0x11
#define MCP23S17_GPIOA 0x12
#define MCP23S17_GPIOB 0x13
#define MCP23S17_OLATA 0x14
#define MCP23S17_OLATB 0x15
/// Struct representing a single MCP23S17 device
typedef struct MCP23S17
{
/// The SPI device representing this MCP23S17
SPIDevice spi;
} MCP23S17;
void MCP23S17_Init(MCP23S17 *mcp, GPIOPin resetPin);
void MCP23S17_Begin(MCP23S17 *mcp);
void MCP23S17_End(MCP23S17 *mcp);
void MCP23S17_SetDDR(MCP23S17 *mcp, uint16_t ddr);
uint16_t MCP23S17_DDR(MCP23S17 *mcp);
void MCP23S17_SetOutputs(MCP23S17 *mcp, uint16_t data);
uint16_t MCP23S17_Outputs(MCP23S17 *mcp);
uint16_t MCP23S17_ReadInputs(MCP23S17 *mcp);
void MCP23S17_SetPullups(MCP23S17 *mcp, uint16_t pullups);
uint16_t MCP23S17_Pullups(MCP23S17 *mcp);
#endif /* DRIVERS_MCP23S17_H_ */