跑SAM4S程序3:利用滴答时钟延时

2万 · 2015-2-13 13:24

本帖最后由 ddllxxrr 于 2015-2-14 13:00 编辑

这个程序是调用，CMSIS中的滴答时钟来实现1秒钟延时。

首选建立ASF工程，然后选择SAM4S的芯片，我这里选择ATSAM4SD32C

然后系统自动建立程序框架，并且还有LED程序。

然后加入Delay routines模块，

最后键入以下程序：

复制

/**

 * \file

 *

 * \brief Empty user application template

 *

 */



/**

 * \mainpage User Application template doxygen documentation

 *

 * \par Empty user application template

 *

 * This is a bare minimum user application template.

 *

 * For documentation of the board, go \ref group_common_boards "here" for a link

 * to the board-specific documentation.

 *

 * \par Content

 *

 * -# Include the ASF header files (through asf.h)

 * -# Minimal main function that starts with a call to board_init()

 * -# Basic usage of on-board LED and button

 * -# "Insert application code here" comment

 *

 */



/*

 * Include header files for all drivers that have been imported from

 * Atmel Software Framework (ASF).

 */

 /**

 * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>

 */

#include <asf.h>

#include "conf_board.h"

static volatile uint32_t ticks = 0U;



void SysTick_Handler(void)

{

        ticks ++;

}



int main (void)

{

        sysclk_init();

        board_init();     

        



        // Insert application code here, after the board has been initialized.

     if(SysTick_Config(sysclk_get_cpu_hz()/(uint32_t)1000))

         {

                 while(1)

                 {

                 }

         }

        // This skeleton code simply sets the LED to the state of the button.

        while (1) {

                // Is button pressed?

                //if (ioport_get_pin_level(BUTTON_0_PIN) == BUTTON_0_ACTIVE) {

                        // Yes, so turn LED on.

                        ioport_set_pin_level(LED_0_PIN, LED_0_ACTIVE);

                        delay_ms((uint32_t)1000);

                //} else {

                        // No, so turn LED off.

                        ioport_set_pin_level(LED_0_PIN, !LED_0_ACTIVE);

                        delay_ms((uint32_t)1000);

                //}

        }

}