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

static BTN_STATUS *status_ptr;

void MCP23009_Init(BTN_STATUS *status) {
    status_ptr = status;
    
    uint8_t buffer[8];

    buffer[0] = 0x00;   // Starting register address
    buffer[1] = 0xFF;   // IODIR, Set all pins as inputs
    buffer[2] = 0xFF;   // IPOL, Reported values are inverted
    buffer[3] = 0xFF;   // GPINTEN, Enable interrupt-on-change
    buffer[4] = 0x00;   // DEFVAL, IOC default values
    buffer[5] = 0x00;   // INTCON, IOC compare to previous value
    buffer[6] = 0x00;   // IOCON, Incrementing address, active-low interrupt cleared on GPIO read
    buffer[7] = 0xFF;   // GPPU, Enable pull-ups on all pins

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

void MCP23009_Query(void) {
    uint8_t buffer[2];

    I2C2_Master_Restart(MCP23009_ADDR, MCP23009_GPIOA, 1);
    uint8_t result;
    do {
        result = I2C2_Get_Status();
    } while (!result);
    I2C2_Read_Buffer(buffer);

    status_ptr->w = buffer[0];
}