Advantech ADAM-4500 user manual Wdtenable, Wdtclear, Wdtdisable

Function Description:

LED ON/OFF control

Parameter	Description
int type	0: LED OFF
	1: LED ON

wdt_enable

Syntax:

wdt_enable()

Function Description:

This function enables the watchdog timer function. After a user calls this function, the user must call the wdt_clear() function to refresh the watchdog timer; otherwise the CPU resets, or a non- maskable interrupt is generated.

wdt_clear

Syntax:

wdt_clear()

Function Description:

This function refreshes the watchdog timer, thereby avoiding the resetting of the CPU or the generation of a non-maskable interrupt.

wdt_disable

Syntax:

wdt_disable()

Function Description:

This function disables the watchdog timer function.

Appendix A Register Structure

This appendix gives a short description of each of the ADAM-4500's registers. For more information please refer to the data book for the STARTECH 16C550 UART chip.

All registers are one byte in length. Bit 0 is the least significant bit, and bit 7 is the most significant bit. The address of each register is specified as an offset from the port base address (BASE), COM1 is 3F8h and COM2 is 2F8h.

DLAB is the "Divisor Latch Access Bit", bit 7 of BASE+3.