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260 Kevin 1 
#include "defines.h"
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#include "MCP23009.h"
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#include "I2C2.h"
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static BTN_STATUS *status_ptr;
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void MCP23009_Init(BTN_STATUS *status) {
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    status_ptr = status;
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    uint8_t buffer[8];
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    buffer[0] = 0x00;   // Starting register address
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    buffer[1] = 0xFF;   // IODIR, Set all pins as inputs
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    buffer[2] = 0xFF;   // IPOL, Reported values are inverted
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    buffer[3] = 0xFF;   // GPINTEN, Enable interrupt-on-change
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    buffer[4] = 0x00;   // DEFVAL, IOC default values
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    buffer[5] = 0x00;   // INTCON, IOC compare to previous value
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    buffer[6] = 0x00;   // IOCON, Incrementing address, active-low interrupt cleared on GPIO read
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    buffer[7] = 0xFF;   // GPPU, Enable pull-ups on all pins
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    I2C2_Master_Send(MCP23009_ADDR, 8, buffer);
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    uint8_t result;
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    do {
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        result = I2C2_Get_Status();
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    } while (!result);
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}
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void MCP23009_Query(void) {
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    uint8_t buffer[2];
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    I2C2_Master_Restart(MCP23009_ADDR, MCP23009_GPIOA, 1);
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    uint8_t result;
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    do {
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        result = I2C2_Get_Status();
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    } while (!result);
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    I2C2_Read_Buffer(buffer);
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273 Kevin 38 
    status_ptr->w = buffer[0];
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}