28 lines
870 B
C
28 lines
870 B
C
#pragma once
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#include "quantum.h"
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#include <stdint.h>
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#include <stdbool.h>
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#include "i2c_master.h"
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#include <util/delay.h>
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extern i2c_status_t mcp23018_status;
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#define I2C_TIMEOUT 1000
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// I2C aliases and register addresses (see "mcp23018.md")
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//#define I2C_ADDR 0b0100000
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#define I2C_ADDR 0x20
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#define I2C_ADDR_WRITE ( (I2C_ADDR<<1) | I2C_WRITE )
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#define I2C_ADDR_READ ( (I2C_ADDR<<1) | I2C_READ )
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#define IODIRA 0x00 // i/o direction register
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#define IODIRB 0x01
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#define GPPUA 0x0C // GPIO pull-up resistor register
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#define GPPUB 0x0D
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#define GPIOA 0x12 // general purpose i/o port register (write modifies OLAT)
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#define GPIOB 0x13
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#define OLATA 0x14 // output latch register
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#define OLATB 0x15
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uint8_t init_mcp23018(void);
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