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我想要讓輸出資料達到每秒2000筆的資料
可是就算使用3200hz 的速率 每秒就只能輸出55筆資料
請問我要如何提高採集速率或是輸出速率 謝謝
- #include <Wire.h>
- #define DEVICE (0x53) //ADXL345 device address
- #define TO_READ (6) //num of bytes we are going to read each time (two bytes for each axis)
- byte buff[TO_READ] ; //6 bytes buffer for saving data read from the device
- char str[512]; //string buffer to transform data before sending it to the serial port
- int a=0;
- void setup()
- {
- Wire.begin(); // join i2c bus (address optional for master)
- Serial.begin(9600); // start serial for output
-
- //Turning on the ADXL345
- writeTo(DEVICE, 0x2D, 0);
- writeTo(DEVICE, 0x2D, 16);
- writeTo(DEVICE, 0x2D, 8);
- writeTo(DEVICE, 0x2C, 15);
- }
- void loop()
- {
-
- int regAddress = 0x32; //first axis-acceleration-data register on the ADXL345
- int x, y, z;
-
- readFrom(DEVICE, regAddress, TO_READ, buff); //read the acceleration data from the ADXL345
-
- //each axis reading comes in 10 bit resolution, ie 2 bytes. Least Significat Byte first!!
- //thus we are converting both bytes in to one int
- x = (((int)buff[1]) << 8) | buff[0];
- y = (((int)buff[3])<< 8) | buff[2];
- z = (((int)buff[5]) << 8) | buff[4];
-
- //we send the x y z values as a string to the serial port
- sprintf(str, "%d %d %d", x, y, z);
- a=a+1;
- Serial.println(a);
- Serial.println(millis());
- //Serial.println(str);
- // Serial.write(10);
-
- //It appears that delay is needed in order not to clog the port
- delay(15);
- }
- //---------------- Functions
- //Writes val to address register on device
- void writeTo(int device, byte address, byte val) {
- Wire.beginTransmission(device); //start transmission to device
- Wire.write(address); // send register address
- Wire.write(val); // send value to write
- Wire.endTransmission(); //end transmission
- }
- //reads num bytes starting from address register on device in to buff array
- void readFrom(int device, byte address, int num, byte buff[]) {
- Wire.beginTransmission(device); //start transmission to device
- Wire.write(address); //sends address to read from
- Wire.endTransmission(); //end transmission
-
- Wire.beginTransmission(device); //start transmission to device
- Wire.requestFrom(device, num); // request 6 bytes from device
-
- int i = 0;
- while(Wire.available()) //device may send less than requested (abnormal)
- {
- buff[i] = Wire.read(); // receive a byte
- i++;
- }
- Wire.endTransmission(); //end transmission
- }
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发表于 2014-4-27 11:13:36
楼主