main.c

#ifndef __PORT_EXPANDER_
#define __PORT_EXPANDER_

#include <xil_types.h>
#include "common.h"

/// Perform all necessary setup of the underlying I2C peripheral and port expander.
void pe_setup(u16 device_id, u32 bus_clock_hz);

/// Sets given GPIO pin state.
void pe_set_gpio(u32 pin, pin_state_t value);

enum
{
    PORT_A = 0x000,
    PORT_B = 0x100,
} t_pe_port;

enum
{
    DEVICE_1 = 0x00000,
    DEVICE_2 = 0x10000,
} t_pe_device;

typedef struct
{
    u8 pin;
    u8 port;
    u8 device;
} t_pe_pin;

// MCP23017 1
// Port A

#define PIN_QUENCH_RELAY                                \
    {                                                   \
        .device = DEVICE_1, .port = PORT_A, .pin = 0x00 \
    }
#define PIN_BCM_EN3                                     \
    {                                                   \
        .device = DEVICE_1, .port = PORT_A, .pin = 0x01 \
    }
#define PIN_BCM_EN2                                     \
    {                                                   \
        .device = DEVICE_1, .port = PORT_A, .pin = 0x02 \
    }
#define PIN_BCM_EN1                                     \
    {                                                   \
        .device = DEVICE_1, .port = PORT_A, .pin = 0x03 \
    }
#define PIN_BCM_EN0                                     \
    {                                                   \
        .device = DEVICE_1, .port = PORT_A, .pin = 0x04 \
    }
#define PIN_LED_BLUE                                    \
    {                                                   \
        .device = DEVICE_1, .port = PORT_A, .pin = 0x05 \
    }
#define PIN_LED_RED                                     \
    {                                                   \
        .device = DEVICE_1, .port = PORT_A, .pin = 0x06 \
    }
#define PIN_LED_GREEN                                   \
    {                                                   \
        .device = DEVICE_1, .port = PORT_A, .pin = 0x07 \
    }

// Port B

#define PIN_RELAY_A                                     \
    {                                                   \
        .device = DEVICE_1, .port = PORT_B, .pin = 0x00 \
    }
#define PIN_RELAY_B                                     \
    {                                                   \
        .device = DEVICE_1, .port = PORT_B, .pin = 0x01 \
    }
#define PIN_REL3                                        \
    {                                                   \
        .device = DEVICE_1, .port = PORT_B, .pin = 0x02 \
    }
#define PIN_REL4                                        \
    {                                                   \
        .device = DEVICE_1, .port = PORT_B, .pin = 0x03 \
    }
#define PIN_REL5                                        \
    {                                                   \
        .device = DEVICE_1, .port = PORT_B, .pin = 0x04 \
    }
#define PIN_REL1                                        \
    {                                                   \
        .device = DEVICE_1, .port = PORT_B, .pin = 0x05 \
    }
#define PIN_REL2                                        \
    {                                                   \
        .device = DEVICE_1, .port = PORT_B, .pin = 0x06 \
    }
#define PIN_SERPAR                                      \
    {                                                   \
        .device = DEVICE_1, .port = PORT_B, .pin = 0x07 \
    }

// MCP23017 2
// Port A
#define PIN_EN_PSH_MAIN                                 \
    {                                                   \
        .device = DEVICE_2, .port = PORT_A, .pin = 0x00 \
    }
#define PIN_EN_PSH_123                                  \
    {                                                   \
        .device = DEVICE_2, .port = PORT_A, .pin = 0x01 \
    }
#define PIN_EN_PSH_PWR                                  \
    {                                                   \
        .device = DEVICE_2, .port = PORT_A, .pin = 0x02 \
    }

#define PIN_BCM_EN_LVDS                                 \
    {                                                   \
        .device = DEVICE_2, .port = PORT_A, .pin = 0x03 \
    }

#endif