24 lines
750 B
C
Executable File
24 lines
750 B
C
Executable File
#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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/* I2C aliases and register addresses (see "mcp23018.md") */
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#define I2C_ADDR (0b0100000 << 1)
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#define I2C_TIMEOUT 100
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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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extern uint8_t mcp23018_status;
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uint8_t init_mcp23018(void);
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