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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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void MCP23009_Init(void) {
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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;   // Set all pins as inputs
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    buffer[2] = 0xFF;   // Reported values are inverted
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    buffer[3] = 0x00;   // Disable interrupt-on-change
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    buffer[4] = 0x00;   // IOC default values
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    buffer[5] = 0x00;   // IOC compare to previous pin value
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    buffer[6] = 0x00;   // Config settings
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    buffer[7] = 0xFF;   // 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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270 Kevin 25 
void MCP23009_Query(BTN_STATUS *status) {
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    uint8_t buffer[2] = {MCP23009_GPIOA};
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    I2C2_Master_Send(MCP23009_ADDR, 1, 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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    I2C2_Master_Recv(MCP23009_ADDR, 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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270 Kevin 41 
    status->w = buffer[0];
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}