pllsetk.c

easyARM8962 锁相环操作实验源码

/****************************************Copyright (c)****************************************************
**                            Guangzhou ZHIYUAN electronics Co.,LTD.
**                                      
**                                 http://www.embedtools.com
**
**--------------File Info---------------------------------------------------------------------------------
** File name:               pllsetk.c
** Latest modified Date:    2007-09-16
** Latest Version:          1.1
** Descriptions:            PLL设置实验程序
**
**--------------------------------------------------------------------------------------------------------
** Created by:              Zhao shimin
** Created date:            2007-09-16
** Version:                 1.0
** Descriptions:            The original version
**
**--------------------------------------------------------------------------------------------------------
** Modified by:            
** Modified date:           
** Version:                 
** Descriptions:            
**
*********************************************************************************************************/

/*  调用库函数的头文件　　*/
#include "hw_memmap.h"
#include "hw_types.h"
#include "ssi.h"
#include "gpio.h"
#include "sysctl.h"
#include "systick.h"

#define   BEEP   GPIO_PIN_7

void JTAGProtect(void);
/*********************************************************************************************************
** Function name:           delay
**
** Descriptions:            延时函数，输入参数越大，延时时间越长
**
** input parameters:        uld    延时时间值
** output parameters:       NONE
**                          
** Returned value:          NONE
**
** Created by:              Zhao shimin
** Created Date:            2007/09/16
**--------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
**--------------------------------------------------------------------------------------------------------
*********************************************************************************************************/
void delay (unsigned long uld)
{
    for(; uld; uld--);
}
/*********************************************************************************************************
** Function name:           main
**
** Descriptions:            PLL设置程序
**
** input parameters:        NONE
** output parameters:       NONE
**                          
** Returned value:          NONE
**
** Created by:              Zhao shimin
** Created Date:            2007/09/16
**--------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
**--------------------------------------------------------------------------------------------------------
*********************************************************************************************************/
int main (void)
{
    unsigned long  i;
    JTAGProtect();
    SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | 
                   SYSCTL_OSC_MAIN | SYSCTL_XTAL_6MHZ);                 /*  设置直接使用外部晶体        */
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);                        /*  给GPIOA提供时钟             */
	
    /* 设定 GPIO PA6引脚为推挽2MA输出　                    */
    GPIOPadConfigSet(GPIO_PORTA_BASE, BEEP, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD);
    /* 设定 GPIO PA6 引脚为GPIO输出口                      */
    GPIODirModeSet(GPIO_PORTA_BASE, BEEP, GPIO_DIR_MODE_OUT);

    for (i = 0; i < 10; i++) {
        GPIOPinWrite(GPIO_PORTA_BASE,BEEP,~BEEP);
        delay(200000);
        GPIOPinWrite(GPIO_PORTA_BASE,BEEP,BEEP);
        delay(200000);
    }

   
    SysCtlClockSet(SYSCTL_SYSDIV_10 | SYSCTL_OSC_MAIN | 
                   SYSCTL_USE_PLL   | SYSCTL_XTAL_6MHZ);                /*  设置使用PLL，10分频         */
    for (i = 0; i < 10; i++) {
        GPIOPinWrite(GPIO_PORTA_BASE,BEEP,~BEEP);
        delay(200000);
        GPIOPinWrite(GPIO_PORTA_BASE,BEEP,BEEP);
        delay(200000);
    }
    while (1) {
        ;
    }    
   
}
/*********************************************************************************************************
** Function name:           JTAGProtect
**
** Descriptions:            防止JTAG失效的程序
**
** input parameters:        NONE
** output parameters:       NONE
**                          
** Returned value:          NONE
**
** Created by:              Zhao shimin
** Created Date:            2007/09/16
**--------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
**--------------------------------------------------------------------------------------------------------
*********************************************************************************************************/
#define KEY3   GPIO_PIN_4

void JTAGProtect (void)
{   
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);                        /*  给GPIOB提供时钟             */
    /* 设定 GPIO PB4引脚为上拉2MA输入　                    */
    GPIOPadConfigSet(GPIO_PORTB_BASE, KEY3, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD);
    /* 设定 GPIO PB4 引脚为GPIO输入口                      */
    GPIODirModeSet(GPIO_PORTB_BASE, KEY3, GPIO_DIR_MODE_IN);
    
    while ((GPIOPinRead(GPIO_PORTB_BASE,KEY3) & KEY3)== 0) {
        ;
    }
}

/*********************************************************************************************************
  END FILE
*********************************************************************************************************/