Rev 275 | Blame | Compare with Previous | Last modification | View Log | RSS feed
#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[3] = 0x00; // GPINTEN, Disable 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];
}