adccmd.c

来自「用c编写的基于ARM的max1246的驱动程序源码和应用示例。」· C语言 代码 · 共 42 行

//----------------------------------------------------------------------------
//
// FILE NAME                                      VERSION
// ADCcmd.c                                       1.0
//
// DESCRIPTION
//     ADC command functions for S3C44B0X
//     Use MAX1246 4-QSPI ports
//
// DEPENDENCIES
//      ADCdrv.c
//
// HISTORY:
//  2005.12.15      Arthur Zhu      Initial begin
//  2005.06.24      Arthur Zhu      support bipolar mode
//----------------------------------------------------------------------------
#include "ADClib.h"     // Hardware enviroment and function definitions

//----------------------------------------------------------------------------
// Function name    : MAX1246_RD_AVG -> ADC_RD_AVG
// Description      : 从A/D读值子程序
// Return type      : short
// Argument         : unsigned int cmd: 命令字 (8-bit)
// Argument         : unsigned char times: 次数
//----------------------------------------------------------------------------
short ADC_RD_AVG (unsigned int cmd, unsigned char times)
{
    unsigned char i;
    int  result;                        // 定义命令字，和数据存储器

    result = 0;
    for (i = 0; i < times; i++)
    {
        result += ADC_RD_DAT (cmd);     // 读取result once
        MAX1246_CSn_NOVALID;            // 命令结束, CSn = 1
    }
    result /= times;
    return (result);                    // 返回键值 12-bit
}