ADLINK Technology cPCI-6630 Series, User Manual

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68 Utilities
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EDGE COMPUTING
7.2 User LED Programming
The eight User LEDs on the front panel display port 80h POST
codes in hexadecimal during boot up. Users can use the POST
codes to identify issues during the BIOS POST process. In default
mode, these eight LEDs display the POST code output to Port 80h
during system bootup (see “User LEDs” on page 24). After the
system is under OS control, the eight User LEDs can be controlled
as user defined LEDs. The LEDs are connected to eight GPIO
pins of the Super I/O IT8786. Users can follow the sample code
below to control the LEDs.
Sample Code
#define IT8786_GPIO_BASE_ADDRESS 0xa00
typedef unsigned char BYTE;
//================================================
//
// Procedure: LedCheckpoint
//
//================================================
VOID LedCheckpoint(IN BYTE Checkpoint)
{
BYTE bData = 0xFF, i;
for(i=0; i<8; i++)
{
if(Checkpoint&(1<<i))
bData &= ~(UINT8)(1<<i);
}
for (i=0; i<8; i++)
{
if(bData &(1<<i))
{
bData2 |= 0x01;
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