与ADXL345的Arduino编程，提高对静止中断 [英] Programming Arduino with ADXL345 to raise interrupt on inactivity
本文介绍了与ADXL345的Arduino编程，提高对静止中断的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我需要使用sparkfun接口板 ADXL345 以当我的电机系统停止振动检测。我也用Sparkfun RedBoard（Arduino的UNO）。
事情我做来配置此行为：
- 启用非活动事件
- 路线INACTIVITY事件（在RedBoard引脚2）INT 1
- 提高静止中断刻不容缓
- 设置低门槛的非活动状态（排除过高的设定）
- INACTIVITY认为所有轴
- 清除中断数据寄存器
做完所有这些事情我从色器件晃动制定下来后，会不会收到中断。
//添加SPI库，以便我们可以用ADXL345传感器通讯
＃包括LT＆;＆spi.h中GT;//将片选信号引脚10。
INT CS = 10;//这是一些寄存器上ADXL345可用的列表。
//要了解更多关于这些和在ADXL345寄存器的休息，读数据表！
焦炭POWER_CTL = 0x2D; //功率控制寄存器
焦炭DATA_FORMAT = 0X31;
焦炭DATAX0 = 0x32; // X轴数据0
焦炭DATAX1 = 0x33; // X轴数据1
焦炭DATAY0 = 0x34; // y轴数据0
焦炭DATAY1 = 0x35; // y轴数据1
焦炭DATAZ0 = 0x36数据; // Z轴数据0
焦炭DATAZ1 = 0x37符号; // Z轴数据1焦炭THRESH_ACT = 0X24; //活动门槛
焦炭THRESH_INACT = 0x38; //活动阈值到3G
焦炭TIME_INACT = 0×26; //养中断前的时间焦炭INT_ENABLE = 0x2E之间; //启用断线焦炭INT_MAP =值为0x2F;
焦炭ACT_INACT_CTL = 0×27; //控制屏蔽字节焦炭INT_SOURCE =的0x30;//这个缓冲区将举行从ADXL345寄存器读取值。
char值[10];
//这些变量将被用于保持在x，y和z轴加速度计值。
INT X，Y，Z;无效设置（）{
//启动SPI通信实例。
SPI.begin（）;
//配置的ADXL345的SPI连接。
SPI.setDataMode（SPI_MODE3）;
//创建串行连接，以显示在终端上的数据。
Serial.begin（9600）; //设置的片选引脚是从Arduino的输出。
pinMode（CS，OUTPUT）;
通信开始//之前，片选引脚需要设置为高。
digitalWrite（CS，高）; //创建一个中断，将触发检测时不活动
attachInterrupt（0，interruptHandler，上升）; //通过写值为0x01到DATA_FORMAT寄存器放置到ADXL345 4G +/-范围。
writeRegister（DATA_FORMAT，0x01）的;
//通过写0x08到了POWER_CTL寄存器放置ADXL345进入测量模式。
writeRegister（POWER_CTL，0×08）; //测量模式 //发送活动和放大器;＆安培;活动引脚1
// 0xF7和放大器;＆安培; 0xEF
writeRegister（INT_MAP，0xF7和放大器;＆安培; 0xEF）; //不活动阈值设置为3G（0x38）
// writeRegister（THRESH_INACT，0x38）;
writeRegister（THRESH_INACT，1）; //抬起INACT中断会低于阈值后，立即
writeRegister（TIME_INACT，0）;
//地图INACT事件（只）到引脚1
writeRegister（ACT_INACT_CTL，为0x0F）; // ENAB乐活动产生中断
writeRegister（INT_ENABLE，0×08）; readRegister（INT_SOURCE，1，值）; //清除INT_SOURCE寄存器 Serial.println（等待中断！）;
}无效interruptHandler（）{
// readRegister（INT_SOURCE，1，值）; //清除INT_SOURCE寄存器
Serial.println（养事的中断！）;
}空隙环（）{
//读6个字节从寄存器DATAX0将从ADXL345检索的X，Y和Z加速度值数据。
//读取操作的结果将得到存储到值[]缓冲区。
readRegister（DATAX0，6，价值观）; //该ADXL345给出10位的加速度值，但它们被存储为字节（8位）。要获得完整的值，两个字节必须结合每个轴。
// X值存储在数值[0]和值[1]。
X =（（int）的值[1];＆下; 8）|（int）的值[0];
// Y值被存储在值[2]和值[3]。
Y =（（int）的值[3]所述;＆下; 8）|（int）的值[2];
// Z值被存储在值[4]和值[5]。
Z =（（int）的值[5]所述;＆下; 8）|（int）的值[4]; //打印结果给终端。
Serial.print（X，DEC）;
Serial.print（，）;
Serial.print（Y，DEC）;
Serial.print（，）;
Serial.println（Z，DEC）;
延迟（500）;
}//这个函数会写一个值的ADXL345寄存器。
//参数：
//字符registerAddress - 写值到寄存器
//字符值 - 要写入指定的寄存器。
无效writeRegister（CHAR registerAddress，char值）{
//设置片选引脚为低电平信号的SPI包的开始。
digitalWrite（CS，LOW）;
//在SPI传输寄存器地址。
SPI.transfer（registerAddress）;
//在SPI传输所需要的寄存器值。
SPI.transfer（值）;
//设置片选引脚为高电平信号的SPI数据包的结束。
digitalWrite（CS，高）;
}//这个功能将读取一定数量从指定的地址开始的寄存器和它们的值存储在缓冲器中。
//参数：
//字符registerAddress - 寄存器addresse开始从读取序列。
//诠释的numBytes - 应该读取的寄存器的数量。
//字符*值 - 在什么地方操作的结果应被存储在缓冲区中。
无效readRegister（CHAR registerAddress，诠释的numBytes，字符*值）{
//因为我们正在执行读操作，寄存器地址的最显著位应设置。
字符地址0x80的= | registerAddress;
//如果我们做一个多字节读，第6位需要被设置为好。
如果（的numBytes→1）地址=地址| 0X40; //设置片选引脚为低电平来启动SPI数据包。
digitalWrite（CS，LOW）;
//将需要被读出的起始寄存器地址。
SPI.transfer（地址）;
//继续读取寄存器，直到我们读过存储结果到输入缓冲区指定的数字。
的for（int i = 0; I＆LT;的numBytes;我++）{
值[I] = SPI.transfer（0×00）;
}
//设置芯片选择引脚拉高以结束SPI包。
digitalWrite（CS，高）;
}
解决方案
这里是一个教程，Arduino的库和实例草图。如果你还没有通过像这样跑，可能是值得一试起别人的code，它是工作（也许你已经这样做了）。
在从code以上，他们允许中断的例子草图，他们只是似乎没有给他们扎入的Arduino的外部中断系统。一旦你验证例如code是工作，你可以调用attachInterrupt（）和放弃轮询方法（如你在你的例子做）。
I need to use a sparkfun breakout board ADXL345 to detect when my motor system has stopped vibrating. I am also using a Sparkfun RedBoard (Arduino uno).
Things I am doing to configure for this behavior:
- enable INACTIVITY event
- route INACTIVITY events to INT 1 (pin 2 on the RedBoard)
- raise INACTIVITY interrupt without delay
- set low threshold for INACTIVITY (rule out too high of a setting)
- INACTIVITY considers all axes
- clear interrupt data register
Having done all these things I do not receive interrupts after going from shaking the devise to setting it down.
//Add the SPI library so we can communicate with the ADXL345 sensor
#include <SPI.h>
//Assign the Chip Select signal to pin 10.
int CS=10;
//This is a list of some of the registers available on the ADXL345.
//To learn more about these and the rest of the registers on the ADXL345, read the datasheet!
char POWER_CTL = 0x2D; //Power Control Register
char DATA_FORMAT = 0x31;
char DATAX0 = 0x32; //X-Axis Data 0
char DATAX1 = 0x33; //X-Axis Data 1
char DATAY0 = 0x34; //Y-Axis Data 0
char DATAY1 = 0x35; //Y-Axis Data 1
char DATAZ0 = 0x36; //Z-Axis Data 0
char DATAZ1 = 0x37; //Z-Axis Data 1
char THRESH_ACT = 0x24; // Activity threshold
char THRESH_INACT = 0x38; // Inactivity threshold to 3g
char TIME_INACT = 0x26; // time before raising interrupt
char INT_ENABLE = 0x2E; // Enabling the interrupt lines
char INT_MAP = 0x2F;
char ACT_INACT_CTL = 0x27; // mask byte for controlling
char INT_SOURCE = 0x30;
//This buffer will hold values read from the ADXL345 registers.
char values[10];
//These variables will be used to hold the x,y and z axis accelerometer values.
int x,y,z;
void setup(){
//Initiate an SPI communication instance.
SPI.begin();
//Configure the SPI connection for the ADXL345.
SPI.setDataMode(SPI_MODE3);
//Create a serial connection to display the data on the terminal.
Serial.begin(9600);
//Set up the Chip Select pin to be an output from the Arduino.
pinMode(CS, OUTPUT);
//Before communication starts, the Chip Select pin needs to be set high.
digitalWrite(CS, HIGH);
// Create an interrupt that will trigger when inactivity is detected
attachInterrupt(0, interruptHandler, RISING);
//Put the ADXL345 into +/- 4G range by writing the value 0x01 to the DATA_FORMAT register.
writeRegister(DATA_FORMAT, 0x01);
//Put the ADXL345 into Measurement Mode by writing 0x08 to the POWER_CTL register.
writeRegister(POWER_CTL, 0x08); //Measurement mode
// Send the inactivity && activity to PIN 1
// 0xF7 && 0xEF
writeRegister(INT_MAP,0xF7 && 0xEF);
// Set the inactivity threshold to 3g (0x38)
// writeRegister(THRESH_INACT,0x38);
writeRegister(THRESH_INACT,1);
// Raise the inact interrupt immediately after going below threshold
writeRegister(TIME_INACT,0);
// Map INACT event (only) to PIN 1
writeRegister(ACT_INACT_CTL, 0x0F);
// Enab le inactivity to generate interrupts
writeRegister(INT_ENABLE, 0x08);
readRegister(INT_SOURCE, 1, values); // Clear the INT_SOURCE register
Serial.println("Waiting for interrupt!");
}
void interruptHandler(){
// readRegister(INT_SOURCE, 1, values); // Clear the INT_SOURCE register
Serial.println("something raise an interrupt!");
}
void loop(){
//Reading 6 bytes of data starting at register DATAX0 will retrieve the x,y and z acceleration values from the ADXL345.
//The results of the read operation will get stored to the values[] buffer.
readRegister(DATAX0, 6, values);
//The ADXL345 gives 10-bit acceleration values, but they are stored as bytes (8-bits). To get the full value, two bytes must be combined for each axis.
//The X value is stored in values[0] and values[1].
x = ((int)values[1]<<8)|(int)values[0];
//The Y value is stored in values[2] and values[3].
y = ((int)values[3]<<8)|(int)values[2];
//The Z value is stored in values[4] and values[5].
z = ((int)values[5]<<8)|(int)values[4];
//Print the results to the terminal.
Serial.print(x, DEC);
Serial.print(',');
Serial.print(y, DEC);
Serial.print(',');
Serial.println(z, DEC);
delay(500);
}
//This function will write a value to a register on the ADXL345.
//Parameters:
// char registerAddress - The register to write a value to
// char value - The value to be written to the specified register.
void writeRegister(char registerAddress, char value){
//Set Chip Select pin low to signal the beginning of an SPI packet.
digitalWrite(CS, LOW);
//Transfer the register address over SPI.
SPI.transfer(registerAddress);
//Transfer the desired register value over SPI.
SPI.transfer(value);
//Set the Chip Select pin high to signal the end of an SPI packet.
digitalWrite(CS, HIGH);
}
//This function will read a certain number of registers starting from a specified address and store their values in a buffer.
//Parameters:
// char registerAddress - The register addresse to start the read sequence from.
// int numBytes - The number of registers that should be read.
// char * values - A pointer to a buffer where the results of the operation should be stored.
void readRegister(char registerAddress, int numBytes, char * values){
//Since we're performing a read operation, the most significant bit of the register address should be set.
char address = 0x80 | registerAddress;
//If we're doing a multi-byte read, bit 6 needs to be set as well.
if(numBytes > 1)address = address | 0x40;
//Set the Chip select pin low to start an SPI packet.
digitalWrite(CS, LOW);
//Transfer the starting register address that needs to be read.
SPI.transfer(address);
//Continue to read registers until we've read the number specified, storing the results to the input buffer.
for(int i=0; i<numBytes; i++){
values[i] = SPI.transfer(0x00);
}
//Set the Chips Select pin high to end the SPI packet.
digitalWrite(CS, HIGH);
}
解决方案
Here is a tutorial, arduino library and example sketch. If you haven't run through something like this, might be worth a try starting with someone else's code that is working (maybe you've already done that).
In the example sketch from above, they are enabling interrupts in the code, they just don't seem to tie them into the Arduino's external interrupt system. Once you verify that the example code is working, you can call attachInterrupt() and abandon the polling approach (as you are doing in your example).
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