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#include "defines.h"
#include "MCP23009.h"
#include "I2C2.h"


void MCP23009_Init(void) {
    uint8_t buffer[8];

    buffer[0] = 0x00;   // Starting register address
    buffer[1] = 0xFF;   // Set all pins as inputs
    buffer[2] = 0xFF;   // Reported values are inverted
    buffer[3] = 0x00;   // Disable interrupt-on-change
    buffer[4] = 0x00;   // IOC default values
    buffer[5] = 0x00;   // IOC compare to previous pin value
    buffer[6] = 0x00;   // Config settings
    buffer[7] = 0xFF;   // Enable pull-ups on all pins

    I2C2_Master_Send(MCP23009_ADDR, 8, buffer);
    uint8_t result;
    do {
        result = I2C2_Get_Status();
    } while (!result);
}

uint8_t MCP23009_Query(void) {
    uint8_t buffer[2] = {MCP23009_GPIOA};

    I2C2_Master_Send(MCP23009_ADDR, 1, buffer);
    uint8_t result;
    do {
        result = I2C2_Get_Status();
    } while (!result);

    I2C2_Master_Recv(MCP23009_ADDR, 1);
    uint8_t result;
    do {
        result = I2C2_Get_Status();
    } while (!result);
    I2C2_Read_Buffer(buffer);

    return buffer[0];
}