标签：oca 表示 mic 功能 while cdata border tar P20
最近在做一个识别区域颜色的应用，做了一半做不下去了，器件参数不达标，要改换传感器，问题出在器件选型时没有跟客户那边足够多的沟通。
先看看这款传感器，AMS 的TCS34725，客户要求响应在1ms以内，受到传感积分时间器性能限制（2.4ms），以及I2C通信速率的限制，勉强在10ms以内。
先简单了解下该传感器的原理：
简单讲就是通过4种硅光电二极管分别测量光红色成分，蓝色，绿色，以及整个的亮度，以数字的形式将各成分亮度以数值输出。
我使用了赛元微SC92F8462B mcu 对数据做处理，为啥用用他，因为它集成了32位乘除法器，可以加快MCU运算的能力，而且使用工业品质的1T 8051内核，稳定高效。
简单介绍下，颜色传感器数值转换位RGB表示的方法，我们可以直接从传感器得到cdata，rdata，gdata，bdata三种数据，分别使用rdata，gdata，bdata于cdata相除得到一个比例值，与255相乘，得RGB数值，再取白光读取计算的RGB，把它调校到255：255：255，得到各分量的校准参数。
怎样从个颜色RGB值中取特定颜色这也是一个值得讨论的话题。因被测物体亮度差异，通常是取主颜色数值，计算一个比例的其他颜色数值，比如我要识别红色，就取主色值，得到一个2/3的色值，与其他颜色绿色，蓝色相比，其他颜色值小于2/3就可以认为是红色，具体还得看应用。还有一个钟可以事先设定要识别的颜色，将数值存储在eeprom中，然后，将这个数值加上一个1%~5%的误差做比较，在范围则认为识别成功。
不过我遇到最重要问题是，在提高传感器积分速率时伴随传感器精度下降，以至于得各色值数据过小，无法做正常计算，最终选择停止继续优化。
#include "H/Function_Init.H"
#include "iic_p.h"unsigned int c_val = 0;
unsigned int r_val = 0;
unsigned int g_val = 0;
unsigned int b_val = 0;unsigned char rgb_rval = 0;
unsigned char rgb_gval = 0;
unsigned char rgb_bval = 0;unsigned char temp = 0;
unsigned char calation0 = 0;
unsigned char calation1 = 0;//void Multiplier_Divider_Test(void);
/*************************************************************
说明：
1、Options for Target‘Target1’：BL51 Locate->Code Range:0x100，烧录选项请选择DISRST，复位脚作为普通IO使用；
2、改变TEST的定义，可以分别测试对应的功能；
3、注意：先在Function.H里面选择测试型号
***************************************************************/
//#define Test 2 //BTM:0 EXTI:1 Timer:2 LCD:3 PWM:4 Uart0:5 SSI:6 ADC:7 IAP:8 Multiplier_Divider:9void main(void)
{
P2CON = 0x33; //P20,P21,P24,P25 OUTPUT MODE ,scl,sda,led
P2 = 0x00;
P0CON = 0x18; //p03(g),p04(r) output
P0 = 0x00;
i2c_wtdata(0x81,0xff);
i2c_wtdata(0x8f,0x03);
i2c_wtdata(0x80,0x01);
delayus(255);
i2c_wtdata(0x80,0x03);
while(1)
{
//get rgbc light value
//i2c_rddata(0x92,&sensor_id);
i2c_rddata(0x94,&temp);
c_val = temp;
i2c_rddata(0x95,&temp);
c_val = c_val + (((unsigned int)(temp)) << 8);
i2c_rddata(0x96,&temp);
r_val = temp;
i2c_rddata(0x97,&temp);
r_val = r_val + (((unsigned int)(temp)) << 8);
i2c_rddata(0x98,&temp);
g_val = temp;
i2c_rddata(0x99,&temp);
g_val = g_val + (((unsigned int)(temp)) << 8);
i2c_rddata(0x9a,&temp);
b_val = temp;
i2c_rddata(0x9b,&temp);
b_val = b_val + (((unsigned int)(temp)) << 8);
if(c_val > 0x40)
{
//delayus(255);
//coculate rgb_val
//rgb_rval
OPERCON = 0x00;
EXA0 = (unsigned char)(r_val);
EXA1 = (unsigned char)(r_val >> 8);
EXA2 = 0x00;
EXA3 = 0x00;
EXBL = 0xff;
EXBH = 0x00;
OPERCON = 0x80;
while((OPERCON & 0x80) != 0);
//calation0 = EXA0;
//calation1 = EXA1;
//calation2 = EXA2;
//calation3 = EXA3;
OPERCON = 0x60;
EXA3 = 0x00; //bu qi 32bit
EXBL = (unsigned char)(c_val);
EXBH = (unsigned char)(c_val >> 8);
OPERCON = OPERCON | 0x80;
while((OPERCON & 0x80) != 0);
rgb_rval = EXA0;
//coculate rgb_val
//rgb_gval
OPERCON = 0x00;
EXA0 = (unsigned char)(g_val);
EXA1 = (unsigned char)(g_val >> 8);
EXA2 = 0x00;
EXA3 = 0x00;
EXBL = 0xff;
EXBH = 0x00;
OPERCON = 0x80;
while((OPERCON & 0x80) != 0);
OPERCON = 0x60;
EXA3 = 0x00; //bu qi 32bit
EXBL = (unsigned char)(c_val);
EXBH = (unsigned char)(c_val >> 8);
OPERCON = OPERCON | 0x80;
while((OPERCON & 0x80) != 0);
rgb_gval = EXA0;
//coculate rgb_val
//rgb_bval
OPERCON = 0x00;
EXA0 = (unsigned char)(b_val);
EXA1 = (unsigned char)(b_val >> 8);
EXA2 = 0x00;
EXA3 = 0x00;
EXBL = 0xff;
EXBH = 0x00;
OPERCON = 0x80;
while((OPERCON & 0x80) != 0);
OPERCON = 0x60;
EXA3 = 0x00; //bu qi 32bit
EXBL = (unsigned char)(c_val);
EXBH = (unsigned char)(c_val >> 8);
OPERCON = OPERCON | 0x80;
while((OPERCON & 0x80) != 0);
rgb_bval = EXA0;
}
else
{
rgb_rval = 0x00;
rgb_bval = 0x00;
rgb_gval = 0x00;
}
//colour calcu find table
//green
if(rgb_gval > 85)
{
//calation0 = (rgb_gval*13)/20;
OPERCON = 0x00;
EXA0 = (unsigned char)(rgb_gval);
EXA1 = 0X00;
EXA2 = 0x00;
EXA3 = 0x00;
EXBL = 0x03; //*3
EXBH = 0x00;
OPERCON = 0x80;
while((OPERCON & 0x80) != 0);
OPERCON = 0x60;
EXA3 = 0x00; //bu qi 32bit
EXBL = 0x4; ///4
EXBH = 0x00;
OPERCON = OPERCON | 0x80;
while((OPERCON & 0x80) != 0);
calation0 = EXA0;
if((rgb_rval < calation0) && (rgb_bval < calation0))
{
P03 = 1;
}
else
{
P03 = 0;
}
}
else
{
P03 = 0;
}
//colour calcu find table
//red
if((rgb_rval > 85)&&(rgb_rval >= rgb_gval + rgb_bval))
{
//calation0 = (rgb_bval*6)/5;
OPERCON = 0x00;
EXA0 = (unsigned char)(rgb_bval);
EXA1 = 0X00;
EXA2 = 0x00;
EXA3 = 0x00;
EXBL = 0x06; //*6
EXBH = 0x00;
OPERCON = 0x80;
while((OPERCON & 0x80) != 0);
OPERCON = 0x60;
EXA3 = 0x00; //bu qi 32bit
EXBL = 0x05; ///5
EXBH = 0x00;
OPERCON = OPERCON | 0x80;
while((OPERCON & 0x80) != 0);
calation0 = EXA0;
if(rgb_gval < calation0)
{
P04 = 1;
}
else
{
P04 = 0;
}
}
else
{
P04 = 0;
}
//delayus(255);
}
}
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标签：oca 表示 mic 功能 while cdata border tar P20
原文地址：https://www.cnblogs.com/logicexpression/p/13232360.html
