原创用Arduino兼容版做气压温度监控

 2013-1-31 15:39  2830 11 11 分类: MCU/ 嵌入式

朋友找来一个GR-SAKURA小板，是瑞萨做的兼容Arduino的板子，主IC是R5F563NEDDFP：

x20130131135439114.jpg.pagespeed.ic.OmLp6d50zg.jpg

背面：

x20130131135354403.jpg.pagespeed.ic.h5kiM1_z6E.jpg

刚好之前研究过MPL115A2，于是就连上做气压温度监控：

电路示意：

x20130131135814740.gif.pagespeed.ic.SnIm-ytwR-.png

然后就写程序，这个板子的ide比较特别，是云的，在http://tool-cloud.renesas.com/index.php。

MPL115A2是I2C的，要用Wire库，用法与Arduino一样，就这3点：

1】需要在在library里选上wire、并#include

2】setup()里启用并配置好2线的定义：

Wire.begin();

Wire.assignSdaScl (PIN_SDA, PIN_SCL);

3】写操作：

Wire.beginTransmission (SLAVE_ADDRESS);

Wire.write (COMAND_WRITE);//写命令

Wire.endTransmission ();

4】读操作：

int i,j;

i=Wire.requestFrom(SLAVE_ADDRESS,READ_LENGTH);//开始读READ_LENGTH的返回

while(Wire.available()

for(j=0;j

i=Wire.read();//读1byte

}

然后就好办了，加进数据转换之后觉得老这么干等着也看不出来是否在工作，就加了个闪灯，板子看上去这样：

用串口工具做上位机，最后

x20130131141106420.gif.pagespeed.ic._N1bIEUpAN.png

var后面大括号里是原始字节数据，最后3行分别是气压、温度和校验值。

以下是代码：
/*GR-SAKURA Sketch Template Version: V1.02*/
#include <rxduino.h>
#include <Wire.h>

#define I2C_SLAVE_ADDR 0x60
#define I2C_PIN_SDA 1
#define I2C_PIN_SCL 2
#define I2C_DATA_LENGTH 12

#define MY_DEBUG_STR(s) Serial.println(s)
#define MY_DEBUG_HEX(s) Serial.println(s,HEX)


//#define POP_LIMIT 3600
#define POP_LIMIT 10
unsigned long time_count_limit;

//获取传感器数据
void getRAW(byte *var)
{
int i,j;
Wire.beginTransmission (I2C_SLAVE_ADDR);
i=Wire.write (0x12);
i=Wire.write (0x00);
Wire.endTransmission ();
delay(400);
//MY_DEBUG_STR("VARs{");
Wire.beginTransmission (I2C_SLAVE_ADDR);
i=Wire.write (0x00);
Wire.endTransmission ();
delay(30);
i=Wire.requestFrom(I2C_SLAVE_ADDR,I2C_DATA_LENGTH);
//MY_DEBUG_STR(i);
//MY_DEBUG_STR("=");
while(Wire.available()<I2C_DATA_LENGTH){}
for(j=0;j<I2C_DATA_LENGTH;j++){
i=Wire.read();
(*(var++))=i;
//MY_DEBUG_HEX(i);
}
//MY_DEBUG_STR("}");
}
//计算气压值
signed short MPL115A_calculatePressure(unsigned short Padc, unsigned short Tadc,
signed short a0, signed short b1, signed short b2, signed short c12)
{
signed long Pressure;
signed long c12x2, a1, a1x1, y1, a2x2, PComp;
Padc >>= 6;
Tadc >>= 6;
c12x2 = (((signed long)c12) * Tadc) >> 11;
a1 = (signed long)b1 + c12x2;
a1x1 = a1 * Padc;
y1 = (((signed long)a0) << 10) + a1x1;
a2x2 = (((signed long)b2) * Tadc) >> 1;
PComp = (y1 + a2x2) >> 9;
//return (signed short)PComp;
Pressure = ((((signed long)PComp) * 1041) >> 14) + 800;
return (unsigned short)Pressure;
}

void setup()
{
pinMode(PIN_LED0,OUTPUT);//指示灯：数据处理
pinMode(PIN_LED3,OUTPUT);//指示灯：等待中
Wire.begin();//使能I2C

Serial.begin(9600); //set baudrate 9600bps
Wire.assignSdaScl (I2C_PIN_SDA, I2C_PIN_SCL);//I2C的引脚定义

time_count_limit=POP_LIMIT ;/计时器初始化
MY_DEBUG_STR("Ready!");
}
void loop()
{
int i,j;
signed short p,t;
byte ucVar[12];
float ftemp,fpres;

//while(!Serial.available()); //wait command from upper computer
//char c=Serial.read();
time_count_limit--;
if(0==time_count_limit)//时间到
{
time_count_limit=POP_LIMIT ;
digitalWrite(PIN_LED0,1); //turn on the led0
getRAW(ucVar);
MY_DEBUG_STR("var{");
for(j=0;j<I2C_DATA_LENGTH;j++)MY_DEBUG_HEX(ucVar[j]);//输出原始数据
MY_DEBUG_STR("}");

//MY_DEBUG_STR("var done");

p= MPL115A_calculatePressure(
((unsigned short)ucVar[0x0]<<8)|((unsigned short)ucVar[0x1]),
((unsigned short)ucVar[0x2]<<8)|((unsigned short)ucVar[0x3]),
((unsigned short)ucVar[0x4]<<8)|((unsigned short)ucVar[0x5]),
((unsigned short)ucVar[0x6]<<8)|((unsigned short)ucVar[0x7]),
((unsigned short)ucVar[0x8]<<8)|((unsigned short)ucVar[0x9]),
((unsigned short)ucVar[0xa]<<8)|((unsigned short)ucVar[0xb])
);
fpres=((float)(p))/(1<<4);
//MY_DEBUG_STR("PRES=");
//MY_DEBUG_STR(p);
MY_DEBUG_STR(fpres);//输出气压值

t=( ((unsigned short)ucVar[0x2]<<8)|((unsigned short)ucVar[0x3]) )>>6;
ftemp=((float) t- 498.0F) / -5.35F +25.0F;
//MY_DEBUG_STR("TEMP=");
//MY_DEBUG_STR(t);
MY_DEBUG_STR(ftemp);//输出温度值
delay(1000);

digitalWrite(PIN_LED0,0); //set led0 off

}
digitalWrite(PIN_LED3,1);
delay(500);
digitalWrite(PIN_LED3,0);
delay(500);
}

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