key_min_max.lst

/* * 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

     1: unsigned char key_min(void);//变小或调零按键查询子程序
     2: unsigned char key_max(void);//变大或调量程按键查询子程序
     3: void ee_write_float(unsigned char place,float number);//保存浮点数到EEPROM子程序
     4: void pwm(unsigned int mid);//PWM输出子程序
     5: /*
     6: * 函数介绍：调整保存零位、量程PWM输出值
     7: * 输入参数：EEPROM的地址
     8: * 输出参数：
     9: * 返回值 ：
    10: */
    11: void key_min_max(unsigned char place)
    12: {
    13:         unsigned int max, min, mid;
    14:         max = 1023;
    15:         min = 0;
    16:         mid = 512;
    17: 
    18:         while (1)
    19:         {
    20: 
    21:                 if (key_min())
    22:                 {
    23:                         max = mid;
    24:                         mid = (min+mid)>>1;
    25:                         ee_write_float(place, mid);
    26:                 }
    27: 
    28:                 if (key_max())
    29:                 {
    30:                         min = mid;
    31:                         mid = (max+mid)>>1;
    32:                         ee_write_float(place, mid);
    33:                 }
    34: 
    35:                 pwm(mid);
    36:         }
    37: 
    38: }