analog_comparators_in.c

EasyARM615的KEIL下的调试程序,包含IO口,串口,SPI口等

/****************************************Copyright (c)**************************************************
**                               Guangzhou ZHIYUAN electronics Co.,LTD.
**                                     
**                                 http://www.embedtools.com
**
**--------------File Info-------------------------------------------------------------------------------
** File Name: Analog_Comparators_in.c
** Last modified Date: 2007-04-25 
** Last Version: v1.0
** Description: Stellaris系列单片机模拟比较器的操作
** 
**------------------------------------------------------------------------------------------------------
** Created By: Pan Yi Fei
** Created date: 2007-04-25 
** Version: v1.0
** Descriptions: 从PB4输入一路模拟信号，模拟比较器使用内部参考电压 1.1V，比较的结果在 PD7 
**           	上输出，PD7 连接到 LED1以便观察实验现象。同时读取比较寄存器的结果,
**				从PB0输出显示.
**
**------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Description:
**
********************************************************************************************************/

#include "hw_memmap.h"
#include "hw_types.h"
#include "gpio.h"
#include "sysctl.h"
#include "systick.h"
#include "comp.h"

#define PB4 GPIO_PIN_4		// PB4为VIN-
#define PC5 GPIO_PIN_5		// PC5连接LED2
#define PD7 GPIO_PIN_7		// PD7为VOUT

int main(void)
{
  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);                  // 使能GPIO PB口
  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);                  // 使能GPIO PC口
  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);                  // 使能GPIO PD口
  SysCtlPeripheralEnable(SYSCTL_PERIPH_COMP0);                 	// 使能模拟比较器0
  GPIODirModeSet(GPIO_PORTC_BASE, PC5, GPIO_DIR_MODE_OUT); 		// 设置 PC5 为输出
  GPIOPinTypeComparator(GPIO_PORTB_BASE, PB4);                	// 设置 PB4 为C0- 
  GPIODirModeSet(GPIO_PORTD_BASE, PD7, GPIO_DIR_MODE_HW); 		// 设置PD7为C0O
  ComparatorConfigure(COMP_BASE, 0, ( COMP_TRIG_NONE | COMP_ASRCP_REF |
                    	COMP_OUTPUT_NORMAL));                 	// 配置模拟比较器
  ComparatorRefSet(COMP_BASE, COMP_REF_1_1V);            		// 配置内部参考电压为 1.1V
  while (1)
  {
    //读取比较结果. 1:点亮LED1;0:熄灭LED1
	if(ComparatorValueGet(COMP_BASE, 0) == 1 )
		GPIOPinWrite(GPIO_PORTC_BASE, PC5, ~ PC5);		 //点亮LED2
	else
		GPIOPinWrite(GPIO_PORTC_BASE, PC5, PC5);         //熄灭LED2
  }
}