I am interfacing a 14 bit hall effect encoder with arduino. The chip in the encoder is MLX90363.The datasheet is in the attachments.The code provided in the datasheet is for mbed board . I converted it to its arduino equivalent,attached below.I am getting the values but the values are not correct, i measured the angle (real angle) and the values i got from the encoder ,the values are all given in the image which is attached.
Tell me about what is missing or wrong with the code or any hardware etc.
I am a beginner in arduino.
Thanks.
#include<SPI.h>
#include<stdlib.h>
const int chipSelectPin = 10;
unsigned int val[8],val1[8];
char val2[2];
long int error;
unsigned int anglefinal,anglefinal1,ang,crc,virtual_gain,roll_cnt;
float angle,ang_r;
float f32_lsb_to_dec_degrees = 0.02197;
void setup() {
// put your setup code here, to run once:
pinMode(chipSelectPin, INPUT_PULLUP);
Serial.begin(9600);
SPI.begin();
SPI.setClockDivider(SPI_CLOCK_DIV128);
SPI.setBitOrder(MSBFIRST);
SPI.setDataMode(SPI_MODE1);
digitalWrite(chipSelectPin, HIGH);
delay(1000);
}
void loop() {
// put your main code here, to run repeatedly:
digitalWrite(chipSelectPin, LOW);
// GET1 message
val1[0]=SPI.transfer(0x00);
val1[1]=SPI.transfer(0x00);
val1[2]=SPI.transfer(0xFF);
val1[3]=SPI.transfer(0xFF);
val1[4]=SPI.transfer(0x00);
val1[5]=SPI.transfer(0x00);
val1[6]=SPI.transfer(0x13);
val1[7]=SPI.transfer(0xEA);
digitalWrite(chipSelectPin, HIGH);
delay(1);
digitalWrite(chipSelectPin, LOW);
//delay(1);
// NOP
val[0]=SPI.transfer(0x00);
val[1]=SPI.transfer(0x00);
val[2]=SPI.transfer(0xAA);
val[3]=SPI.transfer(0xAA);
val[4]=SPI.transfer(0x00);
val[5]=SPI.transfer(0x00);
val[6]=SPI.transfer(0xD0);
val[7]=SPI.transfer(0xAB);
digitalWrite(chipSelectPin, HIGH);
//digitalWrite(chipSelectPin, HIGH);
//delay(500);
anglefinal1=(val[1] & 0x3F)<<8;
Serial.println(" ");
Serial.print("val1 ");
Serial.print(val[1]);
/*char k1;
val[1]=k1;
int intval1 = atol(k1);
Serial.println(" ");
Serial.print("intval1 ");
Serial.print(intval1);*/
Serial.println(" ");
Serial.print("val0 ");
Serial.print(val[0]);
/*char k0;
val[0]=k0;
int intval0 = atol(k0);
Serial.println(" ");
Serial.print("intval0 ");
Serial.print(intval0);*/
Serial.println(" ");
Serial.print("anglefinal1 ");
Serial.print(anglefinal1);
Serial.println(" ");
anglefinal1=anglefinal1 + val[0];
Serial.println(" ");
Serial.print("anglefinal1 ");
Serial.print(anglefinal1);
Serial.println(" ");
/*anglefinal = anglefinal1;
Serial.println(" ");
Serial.print("anglefinal1 ");
Serial.print(anglefinal1);
Serial.println(" ");*/
error=(val[1])>>6;
//Serial.println(anglefinal);
delay(10);
val2[1]= (val[1] & 0x3F)<<8;
val2[0]= val[0];
ang = atoi(val2);
ang_r = ang*f32_lsb_to_dec_degrees;
Serial.print("My_angle= ");
Serial.println(ang_r,5);
Serial.print("\n");
angle=anglefinal1*f32_lsb_to_dec_degrees;
Serial.print("angle ==== ");
Serial.print(angle,5);
Serial.println(" ");
Serial.print("error= ");
Serial.print(error);
Serial.println(" ");
crc=val[7];
Serial.print("CRC = ");
Serial.print(crc);
Serial.println(" ");
virtual_gain = val[4];
Serial.print(" virtual gain = ");
Serial.print(virtual_gain);
Serial.println(" ");
roll_cnt = val[6] & 0x3F ;
Serial.print(" roll cnt ");
Serial.print(roll_cnt);
Serial.println(" ");
Serial.println("*****************************************");
delay(5000);
}
mlx90363-datasheet-melexis.pdf (1.13 MB)
MLX90363-Getting-Started-Guide-Application-Note-Melexis.pdf (575 KB)
