对于上面的问题，都用到

linux下的getch函数与kbhit函数。

参考了http://kpld8888.wordpress.com/2007/03/07/linux%E4%B8%8B%E7%9A%84getch%E5%87%BD%E6%95%B0%E4%B8%8Ekbhit%E5%87%BD%E6%95%B0-2/

和：http://zhidao.baidu.com/question/461121586.html

但是我照搬上面两条都不能很好的编译，总是有错误。奉上我的文件：

将下列三个文件放在工程目录下，build project即可。

main.c:

#include "kbhit.h"

#include

#include

#include "accelerometer.h" //contains the middle level macros, state variable

// definition and declaration for the

//middle layer (class layer) functions

void delay(int a){

int i,j,delay;

for(i = 0 ; i < 1170*(200/a); i++){

delay = 0;

for(j = 0; j < 100; j++){

delay = delay+1;

}

}

}

int main()

{

float x,y,z; // store x,y,z acceleration

acc_t state;

int i = 0;

int Hz,N;

// initialize using ADXL345 at 50 HZ

if (acc_Init(&state,ADXL345,50,"/dev/input/event3") < 0) {

printf("Cannot Init \n");

return (-1);

}

// No Auto Sleep1:

if (acc_autosleepSet(&state,NO_AUTOSLEEP) < 0) {

printf("Failed to set AutoSleep condition\n");

}

// No Auto Sleep2:

system("echo 0 > /sys/bus/i2c/devices/0-0053/autosleep");

//--------------Initialize finished. --------------//

printf("input the number of data, Hz: ");

scanf("%d,%d", &N, &Hz);

while(i < N){

if (acc_xyzGet(&state,&x,&y,&z) < 0) { // get acceleration

printf("Failed to read acceleration values via non blocking read\n");

}

else {

printf("%f,%f,%f\n",x-0.573,y,z); //x correction

}

delay(Hz);

i++;

if( kbhit()>0 ){

break;

}

}

if (acc_Release(&state) < 0) {

printf("Failed to Release Accelerometer Nuggets\n");

return (-1);

}

else{

printf("Accelerometer Released! \n");

}

return 0;

}

/* if (acc_xyzGet(&state,&x,&y,&z) < 0) { // get acceleration

printf("Failed to read acceleration values via non blocking read\n");

}

else {

printf("Accelerations::: X=%f, Y=%f, Z=%f\n",x,y,z);

}

if (acc_xyzEventGet(&state,&x,&y,&z) < 0) { // get acceleration

printf("Failed to read acceleration values via event get\n");

}

else {

printf("Accelerations::: X=%f, Y=%f, Z=%f\n",x,y,z);

}

if (acc_xyzEventGet(&state,&x,&y,&z) < 0) { // get acceleration

printf("Failed to read acceleration values via event get\n");

}

else {

printf("Accelerations::: X=%f, Y=%f, Z=%f\n",x,y,z);

}

if (acc_freefallEventGet(&state) < 0) {

printf("Failed to wait for Freefall \n");

}

else {

printf ("Freefall!!\n");

}

*/

kbhit.c

/*#include

#include

#include

#include

#include

#include

#include

#include

#include "kbhit.h"

static struct termios initial_settings, new_settings;

static int peek_character = -1;

void init_keyboard()

{

tcgetattr(0,&initial_settings);

new_settings = initial_settings;

new_settings.c_lflag &= ~ICANON;

new_settings.c_lflag &= ~ECHO;

new_settings.c_lflag &= ~ISIG;

new_settings.c_cc[VMIN] = 1;

new_settings.c_cc[VTIME] = 0;

tcsetattr(0, TCSANOW, &new_settings);

}

void close_keyboard()

{

tcsetattr(0, TCSANOW, &initial_settings);

}

int kbhit()

{

unsigned char ch;

int nread;

if (peek_character != -1) return 1;

new_settings.c_cc[VMIN]=0;

tcsetattr(0, TCSANOW, &new_settings);

nread = read(0,&ch,1);

new_settings.c_cc[VMIN]=1;

tcsetattr(0, TCSANOW, &new_settings);

if(nread == 1)

{

peek_character = ch;

return 1;

}

return 0;

}

int readch()

{

char ch;

if(peek_character != -1)

{

ch = peek_character;

peek_character = -1;

return ch;

}

read(0,&ch,1);

return ch;

}

*/

#include

#include

#include

#include

#include

#include

#include

#include

#include "kbhit.h"

#undef TERMIOSECHO

#define TERMIOSFLUSH

/*

* kbhit() — a keyboard lookahead monitor

*

* returns the number of characters available to read

*/

int kbhit ( void )

{

struct timeval tv;

struct termios old_termios, new_termios;

int error;

int count = 0;

tcgetattr( 0, &old_termios );

new_termios = old_termios;

/*

* raw mode

*/

new_termios.c_lflag &= ~ICANON;

/*

* disable echoing the char as it is typed

*/

new_termios.c_lflag &= ~ECHO;

/*

* minimum chars to wait for

*/

new_termios.c_cc[VMIN] = 1;

/*

* minimum wait time, 1 * 0.10s

*/

new_termios.c_cc[VTIME] = 1;

error = tcsetattr( 0, TCSANOW, &new_termios );

tv.tv_sec = 0;

tv.tv_usec = 100;

/*

* insert a minimal delay

*/

select( 1, NULL, NULL, NULL, &tv );

error += ioctl( 0, FIONREAD, &count );

error += tcsetattr( 0, TCSANOW, &old_termios );

return( error == 0 ? count : -1 );

} /* end of kbhit */

/*————————————————*/

kbhit.h

#ifndef KBHITh

#define KBHITh

void init_keyboard(void);

void close_keyboard(void);

int kbhit(void);

int readch(void);

#endif