BCM Advanced Research MX110H, User Manual

Page: 49 / 56

GPIO Setting(GP20 ～ GP27) ：
1.GP20
：
//Enter the Extended Function Mode
IO_WRITE_BYTE(0x2E, 0x87);
IO_WRITE_BYTE(0x2E, 0x87);
// Configure the configuration registers
//Switch to local device 7
IO_WRITE_BYTE(0x2E, 0x07);
IO_WRITE_BYTE(0x2F, 0x07);
//Activate GPIO group 2
IO_WRITE_BYTE(0x2E, 0x30);
UCHAR Temp = IO_READ_BYTE(0x2F)|0x04;
IO_WRITE_BYTE(0x2E, 0x30);
IO_WRITE_BYTE(0x2F, Temp);
//Programmed GPIO20 as an output port
IO_WRITE_BYTE(0x2E, 0xE8);
UCHAR Temp = IO_READ_BYTE(0x2F)&0xFE;
IO_WRITE_BYTE(0x2E, 0xE8);
IO_WRITE_BYTE(0x2F, Temp);
// Set GPIO20 to low state
IO_WRITE_BYTE(0x2E, 0xE9);
UCHAR Temp = IO_READ_BYTE(0x2F)&0xFE;
IO_WRITE_BYTE(0x2E, 0xE9);
IO_WRITE_BYTE(0x2F, Temp);
// Set GPIO20 to high state
IO_WRITE_BYTE(0x2E, 0xE9);
UCHAR Temp = IO_READ_BYTE(0x2F)|0x01;
IO_WRITE_BYTE(0x2E, 0xE9);
IO_WRITE_BYTE(0x2F, Temp);
// Exit the Extended Function Mode
IO_WRITE_BYTE(0x2E, 0xAA);