key_min_max.c

/* * Copyright (c) 2005,浙江联大仪表有限公司仪表技术部 * All rights reserved. * * 文件名称：oil level sensor over.c * 文件

unsigned char key_min(void);//变小或调零按键查询子程序
unsigned char key_max(void);//变大或调量程按键查询子程序
void ee_write_float(unsigned char place,float number);//保存浮点数到EEPROM子程序
void pwm(unsigned int mid);//PWM输出子程序
/*
* 函数介绍：调整保存零位、量程PWM输出值
* 输入参数：EEPROM的地址
* 输出参数：
* 返回值 ：
*/
void key_min_max(unsigned char place)
{
	unsigned int max, min, mid;
	max = 1023;
	min = 0;
	mid = 512;

	while (1)
	{

		if (key_min())
		{
			max = mid;
			mid = (min+mid)>>1;
			ee_write_float(place, mid);
		}

		if (key_max())
		{
			min = mid;
			mid = (max+mid)>>1;
			ee_write_float(place, mid);
		}

		pwm(mid);
	}

}