RAM 6.0 BUX II Series Guía de usuario descargar pdf (Pagina 68)

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BSP Developer’s Guide, 6.0

/***********************************************************************

* sysLedControl - Turn selected LED(s) on or off.

* This routine sets the selected LED on or off.

* RETURNS: N/A.

* SEE ALSO: sysLedInit(), sysLedOff(), sysLedOn().

void sysLedControl

(

int ledOn,

UINT8 led

)

{

* Check led state.

if (ledOn)

sysLed |= led; /* Set LED on. */

else

sysLed &= ~led; /* Set LED off. */

* Write to LED.

BSCR_LED_REGISTER = sysLed;

}

#endif /* INCLUDE_SYSLED */

If the LED manipulation routines are written before the environment is set up for

C subroutine linkage, the routines must be written in standalone assembly

language. In this case, the above sample code can be used as a starting design for

your assembly code. Later on, during the cleanup phase of your BSP development,

the LED routines can be rewritten in C.

In addition to the basic LED routines, a simple control loop is useful to flash the

LEDs on and off, with a suitable delay between the flashes so that they can be seen

easily.

Once the LED routines are written, your initialization code can include calls to turn

on or off LEDs at specific points during initialization.

3.2.4 Debugging the Initialization Code

The beginning portions of the ROM and RAM initialization sequences differ, but

the sequences are otherwise the same. Details of what each BSP procedure must do

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RAM 6.0 BUX II Series Guía de usuario Pagina 68