[ARM] MPU6050 Interfacing to LPC2138

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amit_dhanawade

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Hello,
I want to interfacing MPU6050 I2C gyroscope sensor to lpc2138. I am able to read sensor powered on, but as soon as I move senor a little it hangs up. I don't want to use interrupt so I have disabled it...
Please let me know if I am missing some thing, I searched a lot for tutorial on this but there all is with Arduino and I want it to interface with LPC2138.
Below is code done in Keil...


Code: 
#include <LPC214x.h>
#include <stdio.h>                    /* standard I/O .h-file                */
//#include <ctype.h>                    /* character functions                 */
#include <string.h>                   /* string and memory functions         */
#include "font.h"
#include "glcd.h"
#include "uart.h"
#include "Typedefs.h"
#include "Timer.h"
#include "Target.h"
#include "keypad.h"
#include "adc.h"
#include "i2c.h"
#include "Declarations.h"
#include "rtc.h"
#include "EEPROM.h"
#include "key.h"				
#include "R_Sensors.h"


char key1=0;
short i;
float ldr_val;
char GYRO_XOUT_H;
char GYRO_XOUT_L;
char GYRO_YOUT_H;
char GYRO_YOUT_L;
char GYRO_ZOUT_H;
char GYRO_ZOUT_L;
int xl,yl,zl,xh,yh,zh,st;

int GYRO_XOUT_OFFSET_1000SUM;
int GYRO_YOUT_OFFSET_1000SUM;
int GYRO_ZOUT_OFFSET_1000SUM;

int GYRO_XOUT_OFFSET;
int GYRO_YOUT_OFFSET;
int GYRO_ZOUT_OFFSET;//ldr_val[0]=0;


unsigned char read_gyro(char address)
{
	unsigned char read;
	InitI2C(); 	
//	Delay(1);
	SendI2CAddress(0xD0);	 
//	Delay(1);
	WriteI2C(address);
//	Delay(1);
	InitI2C();
//	Delay(1);
	SendI2CAddress(0xD1);
//	Delay(1);
	read = ReadI2C();	 	
//	Delay(1);
	StopI2C();  	
//	Delay(1);
	return (read);
}

void write_gyro(unsigned char address,unsigned char data)
{
	InitI2C();   
//	Delay(1);	
	SendI2CAddress(0xD0);	
//	Delay(1);
	WriteI2C(address);  
//	Delay(1);	
	WriteI2C(data);	
//	Delay(1);
	StopI2C();
//	Delay(1);
}

void configure_gyro(void)
{
//	write_gyro(SMPLRT_DIV, 0x07);
//	write_gyro(CONFIG, 0x00);
//	write_gyro(GYRO_CONFIG, 0x08);
//	write_gyro(ACCEL_CONFIG, 0x08);
	write_gyro(0x6B, 0x10);
	Delay(100);
//	write_gyro(PWR_MGMT_2, 0x00);
//	write_gyro(SIGNAL_PATH_RESET, 0x00);

	//Reset sensor signal paths
	write_gyro(0x68, 0x07 );
	Delay(10);
	//Disables FIFO, AUX I2C, FIFO and I2C reset bits to 0
	write_gyro(0x6A, 0x07 );
	Delay(10);

	//Motion detection control
	write_gyro(0x69, 0x20 );
	Delay(10);

	//Disables FIFO, AUX I2C, FIFO and I2C reset bits to 0
	write_gyro(0x6A, 0x40 );
	Delay(10);

	//Disable sensor output to FIFO buffer
	write_gyro(0x23, 0xF8 );
	Delay(10);

	//Setup INT pin and AUX I2C pass through
	write_gyro(0x37, 0x00 );
	Delay(10);

	//Enable data ready inerrupt
	write_gyro(0x38, 0x00 );
	Delay(10);

	//Sets clock source to gyro reference w/ PLL
	write_gyro(0x6B, 0x00 );
	Delay(10);

	//Disable accel self tests, scale of +-2g, no DHPF
	write_gyro(0x1C, 0x00 );
	Delay(10);

 	//Sets sample rate to 8000/1+7 = 1000Hz
	write_gyro(0x19, 0x07 );
	Delay(10);
	//Disable FSync, 256Hz DLPF
	write_gyro(0x1A, 0x00 );
	Delay(10);
	//Disable gyro self tests, scale of 500 degrees/s
	write_gyro(0x1B, 0x08 );
	Delay(10);

	//Freefall threshold of |0mg|
	write_gyro(0x1D, 0x00 );
	Delay(10);
	//Freefall duration limit of 0
	write_gyro(0x1E, 0x00 );
	Delay(10);
	//Motion threshold of 0mg
	write_gyro(0x1F, 0x00 );
	Delay(10);
	//Motion duration of 0s
	write_gyro(0x20, 0x00 );
	Delay(10);
	//Zero motion threshold
	write_gyro(0x21, 0x00 );
	Delay(10);
	//Zero motion duration threshold
	write_gyro(0x22, 0x00 );
	Delay(10);

	//determines which sensor measurements are loaded into the FIFO buffer
	write_gyro(0x23, 0xF8 );
	Delay(10);

	
	//AUX I2C setup
	//Sets AUX I2C to single master control, plus other config
	write_gyro(0x24, 0x00 );
	Delay(10);
	//Setup AUX I2C slaves
	write_gyro(0x25, 0x00 );
	Delay(10);
	write_gyro(0x26, 0x00 );
	Delay(10);
	write_gyro(0x27, 0x00 );
	Delay(10);
	write_gyro(0x28, 0x00 );
	Delay(10);
	write_gyro(0x29, 0x00 );
	Delay(10);
	write_gyro(0x2A, 0x00 );
	Delay(10);
	write_gyro(0x2B, 0x00 );
	Delay(10);
	write_gyro(0x2C, 0x00 );
	Delay(10);
	write_gyro(0x2D, 0x00 );
	Delay(10);
	write_gyro(0x2E, 0x00 );
	Delay(10);
	write_gyro(0x2F, 0x00 );
	Delay(10);
	write_gyro(0x30, 0x00 );
	Delay(10);
	write_gyro(0x31, 0x00 );
	Delay(10);
	write_gyro(0x32, 0x00 );
	Delay(10);
	write_gyro(0x33, 0x00 );
	Delay(10);
	write_gyro(0x34, 0x00 );
	Delay(10);
	write_gyro(0x35, 0x00 );
	Delay(10);
	
	//MPU6050_RA_I2C_MST_STATUS //Read-only
	
	//Slave out
	write_gyro(0x63, 0x00 );
	Delay(10);
	write_gyro(0x64, 0x00 );
	Delay(10);
	write_gyro(0x65, 0x00 );
	Delay(10);
	write_gyro(0x66, 0x00 );
	Delay(10);
						  	//More slave config
	write_gyro(0x67, 0x00 );
	Delay(10);
	//Controls frequency of wakeups in accel low power mode plus the sensor standby modes
	write_gyro(0x6C, 0x00 );
	Delay(10);
	
	//Data transfer to and from the FIFO buffer
	write_gyro(0x74, 0x00 );
	Delay(10);
	
}





void Calibrate_Gyros()
{
int ki;
	for (ki = 0; ki < 50; ki++)
	{
		xh = read_gyro(67);
		xl = read_gyro(68);
		yh = read_gyro(69);
		yl = read_gyro(70);
		zh = read_gyro(71);
		zl = read_gyro(72);

		GYRO_XOUT_OFFSET_1000SUM += ((GYRO_XOUT_H << 8) | GYRO_XOUT_L);
		GYRO_YOUT_OFFSET_1000SUM += ((GYRO_YOUT_H << 8) | GYRO_YOUT_L);
		GYRO_ZOUT_OFFSET_1000SUM += ((GYRO_ZOUT_H << 8) | GYRO_ZOUT_L);

	}

		GYRO_XOUT_OFFSET = (GYRO_XOUT_OFFSET_1000SUM / 50);
		GYRO_YOUT_OFFSET = (GYRO_YOUT_OFFSET_1000SUM / 50);
		GYRO_ZOUT_OFFSET = (GYRO_ZOUT_OFFSET_1000SUM / 50);
}



void convert_n_send(int ADCValue)
{
    UART0Send_1Byte(((ADCValue / 100) % 10) + '0');
    UART0Send_1Byte(((ADCValue / 10) % 10) + '0');
    UART0Send_1Byte((ADCValue % 10) + '0');
    UART0Send_1Byte(0x0a);
    UART0Send_1Byte(0x0d);
}

//################################################################################
// Main Function
// 
// Modified Date: 26 Sep 14
// Modified By: Sheetal
//################################################################################
int main(void)
{
	
	PINSEL0 = 0x00000000;
    PINSEL1 = 0x00000000;
    PINSEL2 = 0x00000000;

//    IODIR0 = 0xFFFFFFFF;
//    IODIR1 = 0xFFFFFFFF;  
	
        
    Init_Timer( 0 );
    Enable_Timer( 0 );





			    
	UART0Init( 9600 );

//  	UART0Send("Amit", 4);
	configure_gyro();
//	Calibrate_Gyros();
//	while(1)
//	{
//	  	UART0Send("A", 1);
//		Delay(1000);
//	
//	}
	  	UART0Send("S", 1);

	while(1)
	{

//		st = read_gyro(0x61);

		xh = read_gyro(67);
		Delay(10);
	  	UART0Send("1", 1);
		Delay(10);
		xl = read_gyro(68);
		Delay(10);
	  	UART0Send("2", 1);
		Delay(10);
		yh = read_gyro(69);
		Delay(10);
	  	UART0Send("3", 1);
		Delay(10);
		yl = read_gyro(70);
	  	UART0Send("4", 1);
		Delay(10);
		zh = read_gyro(71);
		Delay(10);
	  	UART0Send("5", 1);
		Delay(10);
		zl = read_gyro(72);
	  	UART0Send("6", 1);
		Delay(10);

	  	UART0Send("A", 1);
		UART0Send_1Byte(xh);
		UART0Send_1Byte(xl);
		UART0Send_1Byte(yh);
		UART0Send_1Byte(yl);
		UART0Send_1Byte(zh);
		UART0Send_1Byte(zl);
	  	UART0Send("C", 1);
		Delay(1000);
	}									

}
 

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