补充一些IAR AVR常用的H和CPP文件

hotpower · 发表于 2009-4-2 23:41:54

adc.cpp(略)
hotpower 发表于 2007-8-23 02:26 AVR 单片机 ←返回版面举报该贴

#include "adc.h"

AdcObj::AdcObj(void)
{
  Init();
}

/*----------------------------------------------------
R0 = 10K, R1 = 51K, Vref = 2.50V
公式：Vx = Vref * (R0 + R1) / R0

   V0 =2.5*(61/10)=15.25V
   V1 =2.5*(61/10)=15.25V
   V23=2.5*(85/10)=21.25V
   Ak = Vx / 1024
-----------------------------------------------------*/
void AdcObj::Init(void)
{
unsigned char i;
AdcChNum = 0;
ADCSRA = 0x00;
ADMUX  = 0;//选择外部2.50为基准
ACSR = (1 << ACD);//关闭模拟比较器
SetAdcChNum(AdcChNum);//设置新通道
for (i = 0; i < 4; i ++) {
      AdcVal[i] = 0;
      AdcCount[i] = 0;
}
AdcSum[1] = 0;
AdcMax[1] = 0;
AdcMin[1] = 0x1ff;//9位ADC

AdcSum[2] = 0;
AdcMax[2] = 0;
AdcMin[2] = 0x3ff;//10位ADC

AdcSum[3] = 0;
AdcMax[3] = 0;
AdcMin[3] = 0x3ff;//10位ADC
/*----------------------------------------------------
R0 = 10K, R1 = 51K, Vref = 2.50V, Vk = 10, N = 9, 10
公式：Vx = Vref * (R0 + R1) / R0
Ak = Vx * / 2 ^ n
Ak0 = 15250 / 512 (N = 9)
      = 30500 / 1024
Ak1 = 15250 / 1024
Ak2 = 21250 / 1024
Ak3 = 21250 / 1024
-----------------------------------------------------*/

ADCSRA = (1 << ADEN) | (1 << ADSC) | (1 << ADIE) | (1 << ADPS2) | (1 << ADPS1);//64分频,启动AD转换
}

inline
unsigned char AdcObj::GetAdcChNum(unsigned char ChNum)
{
__root __flash  static const unsigned char AdcChNumTab[4] =
{//ADC通道变换表
0x09,//0b00001001,//差分测试,*10,ADC1-ADC0
0x09,//0b00001001,//差分测试,*10,ADC1-ADC0
0x02,//0b00000010,//单端测试,*1,ADC2
0x00//0b00000000,//单端测试,*1,ADC0
// 0x03//0b00000011,//电压,单端测试,*1,ADC3
};
return AdcChNumTab[ChNum & 0x03];//返回ADC通道变换号
}

inline
void AdcObj::SetAdcChNum(unsigned char ChNum)//设置ADC通道变换号
{
// ADMUX = (1 << REFS1) | (1 << REFS0) | GetAdcChNum(ChNum);//选择内部2.56为基准
ADMUX = (0 << REFS1) | (1 << REFS0) | GetAdcChNum(ChNum);//选择外部2.50为基准
}

void AdcObj::Exec(void)
{
//volatile
unsigned int AdcResult;
//volatile
unsigned long val;
AdcResult = ADC & 0x3ff;//取ADC转换电压，并保存
SetAdcChNum(AdcChNum + 1);//设置新通道
if (AdcChNum > 0)
{
/*-----------------------------------------------------------
  求累加和
------------------------------------------------------------*/
      AdcSum[AdcChNum] += AdcResult;//存累加和
/*-----------------------------------------------------------
  求最大值
------------------------------------------------------------*/
      if (AdcResult > AdcMax[AdcChNum])
      {
         AdcMax[AdcChNum] = AdcResult;//最大值
      }
/*-----------------------------------------------------------
  求最小值
------------------------------------------------------------*/
      if (AdcResult <= AdcMin[AdcChNum])
      {
         AdcMin[AdcChNum] = AdcResult;//存最小值
      }
      AdcCount[AdcChNum] ++;
      if (AdcCount[AdcChNum] >= 18)//每点测试18次，滤波
      {
/*-----------------------------------------------------------
  求平均值
------------------------------------------------------------*/
/*----------------------------------------------------
   V0 =2.5*(61/10)=15.25V
   V1 =2.5*(61/10)=15.25V
   V23=2.5*(85/10)=21.25V
-----------------------------------------------------*/
         val = AdcSum[AdcChNum] - AdcMax[AdcChNum] - AdcMin[AdcChNum];
         val *= AdcAkVal[AdcChNum];
         val >>= 14;//18中取16后除以1024
         AdcVal[AdcChNum] = val;
/*-----------------------------------------------------------
  初始化
------------------------------------------------------------*/
         AdcSum[AdcChNum] = 0;
         AdcMax[AdcChNum] = 0;
         if (AdcChNum == 1)
         {
            AdcMin[AdcChNum] = 0x1ff;//9位ADC
         }
         else
         {
            AdcMin[AdcChNum] = 0x3ff;//10位ADC
         }
         AdcCount[AdcChNum] = 0;
}
AdcChNum ++;//准备下个通道
AdcChNum &= 3;
ADCSRA = (1 << ADEN) | (1 << ADSC) | (1 << ADIE) | (1 << ADPS2) | (1 << ADPS1);//64分频
}

hotpower · 发表于 2009-4-2 23:42:15

本帖最后由 hotpower 于 2009-4-2 23:44 编辑

注意楼上的"跳水"滤波算法
hotpower 发表于 2007-8-23 02:51 AVR 单片机 ←返回版面举报该贴

hotpower 发表于 2007-8-13 21:07 PIC 单片机 ←返回版面

8楼：这种算法的优点是点数无限~~~(附"跳水算法")

当然N>=3.而且最好N>3为好.在N很大时就见其优点了.
例如: 3中取1,4中取2,5中取3...10中取8...252中取"二百五"~~~
全部只用这4个寄存器~~~,当然要考虑累加越界类型选择的问题.
注意: N最好取4, 6, 10, 34, 66, 130等等~~~!!!!!!!!!!!!!!

/*-----------------------------------------------------------
取ADC转换电压
------------------------------------------------------------*/
AdcResult = ADC & 0x3ff;//取ADC转换电压结果
/*-----------------------------------------------------------
  求累加和
------------------------------------------------------------*/
AdcSum += AdcResult;//存累加和
/*-----------------------------------------------------------
  求最大值
------------------------------------------------------------*/
if (AdcResult > AdcMax)
{
  AdcMax = AdcResult;//最大值
}
/*-----------------------------------------------------------
  求最小值
------------------------------------------------------------*/
if (AdcResult < AdcMin)//注意:千万不敢写成else if ()...
{
  AdcMin = AdcResult;//存最小值
}
AdcCount ++;//计数1次
/*-----------------------------------------------------------
  10中取8("跳水评分算法---去掉一个最高分,去掉...最后得分...")
------------------------------------------------------------*/
if (AdcCount >= 10)//每次滤波10点
{
/*-----------------------------------------------------------
  求平均值
------------------------------------------------------------*/
  val = AdcSum - AdcMax - AdcMin;//自然做到了N-2,以下除法变移位
  val *= AdcGain;//乘增益(一定要先乘后除!!!否则精度丢失!!!)
  val >>= 13;//10中取8后除以1024.(直接得到10进制的mV值)
  AdcVal = val;//得到跳水队员分数~~~
/*-----------------------------------------------------------
  下一轮初始化(也是ADC的初始化,这里原本是调用函数的~~~)
------------------------------------------------------------*/
  AdcSum = 0;//一定清0
  AdcMax = 0;//一定取最小值
  AdcMin = 0x3ff;//10位ADC,一定取最大值
  AdcCount = 0;//重新开始
}

哈哈~~~有时间再灌灌它与排序的不同和优缺点~~~

阿南 · 发表于 2009-4-6 21:59:25

大叔讲课,俺认识听讲,做好学生

mxh0506 · 发表于 2009-6-14 22:35:21

好！hotpower玩C++就是牛！

卖西瓜 · 发表于 2009-6-18 12:37:48

程疗匠人 · 发表于 2009-6-18 12:45:10

老HOT实在是强啊~~

wolaikankan · 发表于 2010-9-26 23:46:53

学习了

lzy89c55 · 发表于 2011-2-14 15:51:56

不错