| 0,0 → 1,39 |
|---|
| #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]; |
| } |