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技术2022-05-11  0


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/******************************************************************************//* BLINKY.C: LED Flasher                                                      *//******************************************************************************//* This file is part of the uVision/ARM development tools.                    *//* Copyright (c) 2005-2006 Keil Software. All rights reserved.                *//* This software may only be used under the terms of a valid, current,        *//* end user licence from KEIL for a compatible version of KEIL software       *//* development tools. Nothing else gives you the right to use this software.  *//******************************************************************************/                  #include <AT91SAM7S64.H>                       /* AT91SAMT7S64 definitions  */#include <lib_AT91SAM7S64.h>#include "../Board.h"

#define SPEED (MCKKHz/10)

const int led_mask[] = { LED1, LED2, LED3, LED4 };

unsigned int LEDSpeed = 50*SPEED;

/*  * Change Speed depending on SW1 and SW2 */

void change_speed (void) {  if ((AT91F_PIO_GetInput(AT91C_BASE_PIOA) & SW1_MASK) == 0) {    if (LEDSpeed > SPEED) LEDSpeed -= SPEED;  }  if ((AT91F_PIO_GetInput(AT91C_BASE_PIOA) & SW2_MASK) == 0) {    if (LEDSpeed < MCK)   LEDSpeed += SPEED;  }}

/* * Wait Function (SW Waiting Loop) *   Waiting Time defined by global variable LEDSpeed */ void wait (void) {  unsigned int n;

  change_speed();  for (n = 0; n < LEDSpeed; n++);} 

/* * Main Program */

int main (void) {  int i;

  // Enable the Clock of the PIO  AT91F_PMC_EnablePeriphClock(AT91C_BASE_PMC, 1 << AT91C_ID_PIOA);

  // Configure the PIO Lines corresponding to LED1..LED4 as Outputs  AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, LED_MASK);

  // Clear the LED's. On the Board we must apply a "1" to turn off LEDs  AT91F_PIO_SetOutput(AT91C_BASE_PIOA, LED_MASK);

  // Loop forever  for (;;) {    for (i = 0; i < NB_LED; i++) {      AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, led_mask[i]);      wait();      AT91F_PIO_SetOutput  (AT91C_BASE_PIOA, led_mask[i]);      wait();    }    for (i = (NB_LED - 1); i >= 0; i--) {      AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, led_mask[i]);      wait();      AT91F_PIO_SetOutput  (AT91C_BASE_PIOA, led_mask[i]);      wait();    }  }}


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