adxl311je.h File Reference

#include <std.h>

Go to the source code of this file.

Enumerations
enum	AXDL_PINS { AXDL_311_X_OUT = ADC_CHANNEL_0, ADXL_311_Y_OUT = ADC_CHANNEL_1 }
	The analog input pins on which the accelerometer is normally connected - may have to be changed accoring to current layout. More...
Functions
long *	read_adxl311 ()
long *	read_adxl311_meanof (int number)

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Enumeration Type Documentation

enum AXDL_PINS

The analog input pins on which the accelerometer is normally connected - may have to be changed accoring to current layout. Enumeration values: AXDL_311_X_OUT  ADXL_311_Y_OUT  Definition at line 43 of file adxl311je.h. { AXDL_311_X_OUT = ADC_CHANNEL_0, ADXL_311_Y_OUT = ADC_CHANNEL_1 };

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Function Documentation

long * read_adxl311 (   )

This function returns both adxl values at once. The duplicate analog reads result from a small problem with the Smart-Its board and because of this problem, a0 is hardwired to a2 and a1 is hardwired to a3. (analog inputs a0 to a8 are on the Smart-Its.) Call to this function: long * array_calling_read_adxl311 = read_adxl311(); access to variables with: array_calling_read_adxl311[0] and array_calling_read_adxl311[1] Returns: array of type long * containing the two long values of the two axis of the adxl. comment out the Y_OUT+3 line if you are using a "normal" smart its board and comment in the next line. Definition at line 72 of file adxl311je.h. References ADXL_311_Y_OUT, and AXDL_311_X_OUT. Referenced by read_adxl311_meanof(). { long xaxis,yaxis,xaxis2,yaxis2; long retval[2]; set_adc_channel(AXDL_311_X_OUT);//a0 delay_us(50); xaxis = read_adc(ADC_START_AND_READ); delay_us(50); set_adc_channel(ADXL_311_Y_OUT+3);//a4 HIER //set_adc_channel(ADXL_311_Y_OUT);//a4 HIER delay_us(50); yaxis2 = read_adc(ADC_START_AND_READ); set_adc_channel(ADXL_311_Y_OUT);//a1 delay_us(50); yaxis = read_adc(ADC_START_AND_READ); delay_us(50); set_adc_channel(AXDL_311_X_OUT);//a3 delay_us(50); xaxis2 = read_adc(ADC_START_AND_READ); retval[0] = xaxis; retval[1] = yaxis; // xaxis2 and yaxis2 are not needed return (retval); }

long * read_adxl311_meanof (  int  number  )

Calculates the mean value during number of calls. Parameters: number  number of calls to read_adxl311 to calculate the mean of the values (xaxis, yaxis). Returns: 0 if i <= 0, an array of xaxis and yaxis, with a calculated mean on number calls to read_adxl311(). Definition at line 107 of file adxl311je.h. References read_adxl311(). { long xtemp, ytemp; long retval[2]; int i=0; retval[0] = retval[1] = 0; ytemp = xtemp = 0; for (i=0;i < number;i++) { long * bla; bla = read_adxl311(); xtemp = xtemp + bla[0]; ytemp = ytemp + bla[1]; } xtemp= xtemp / number; ytemp= ytemp / number; retval[0] = (xtemp); retval[1] = (ytemp); return(retval); }

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