Mixed Relations - Arduino Code

From Banglab

The arduino sketch which reads the heart rate monitor and sends the data over the serial port to Pd. Based on dan julio's code for the polar heart rate arduino module board.

/*
 * Simple Arduino-based program to read values from the HRMI using the I2C interface
 *
 * Connections
 *    Arduino            HRMI
 *    -----------------------
 *      +5                 +5 (Power for the HRMI)
 *      GND                GND
 *      Analog In 5        TX (I2C SCL) (recommend 4.7 kOhm pullup)
 *      Analog In 4        RX (I2C SDA) (recommend 4.7 kOhm pullup)
 *
 *
 * Note: By default the Arduino Wiring library is limited to a maximum
 *       I2C read of 32 bytes. The Get Heartrate command is limited
 *       by this code to a maximum of 30 values (for a max I2C packet
 *       of 32 bytes).
 *
 */

#include "Wire.h"
#include "hrmi_funcs.h"
#include "WProgram.h" 

/*
 * Configuration Information
 *
 * Change these constants to match your specific configuration. These
 * values are the factory default (no OP1-OP7 jumpers installed). Jumper
 * OP1 should be installed and jumper SJ1 removed.
 *
 * HRMI_HOST_BAUDRATE should be set to the baudrate the host will use
 *   to communicate with the Arduino over the serial interface.
 *
 * HRMI_I2C_ADDR should be set to the I2C address the HRMI is configured
 *   with.
 */
#define HRMI_HOST_BAUDRATE 9600
#define HRMI_I2C_ADDR       127

/*
 * Program constants
 */
#define MAX_IN_BUFFSIZE 16

/*
 * Global variables
 */
char serInStr[MAX_IN_BUFFSIZE];    // Serial input string array
int numEntries = 0;                // Number of HR values to request
int numRspBytes;                   // Number of Response bytes to read
byte i2cRspArray[34];
                 // I2C response array, sized to read 32 HR values
byte hrmi_addr = HRMI_I2C_ADDR;      // I2C address to use



/*
  * Arduino initialization code segment
  */
void setup()
{
   // Initialize the I2C communication
   hrmi_open();
   // Initialize the serial interface
   Serial.begin(HRMI_HOST_BAUDRATE);

        
}
/*
  * Arduino main code loop
  */
void loop()
{
     
   // Request a set of heart rate values
   hrmiCmdArg(hrmi_addr, 'G', (byte) numEntries);
   // Get the response from the HRMI
   numRspBytes = numEntries + 2;
   if (hrmiGetData(hrmi_addr, numRspBytes, i2cRspArray) != -1) {
                
     
       // send the results back on the serial interface in ASCII form
       //Serial.print("Request "); Serial.print(numEntries); Serial.print(" => ");
       
       /*for (int i=0; i<numRspBytes; i++) {
         Serial.print(i2cRspArray[i], DEC);
         Serial.print(" ");
       }
       Serial.println();*/
       
    
    Serial.print(i2cRspArray[2]);
    
       
     }
     
   // Setup to do it again
   if (++numEntries > 1)
         numEntries = 0;
   delay(10);                    // Delay 1/100 second between commands

}