linux下kbhit()函数 getch函数。

#include "kbhit.h"
#include <stdio.h>
#include <stdlib.h>
#include "accelerometer.h" //contains the middle level macros, state variable// definition and declaration for the//middle layer (class layer) functionsvoid 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 accelerationacc_t state;int i = 0;int Hz,N;// initialize using ADXL345 at 50 HZif (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 accelerationprintf("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 accelerationprintf("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 accelerationprintf("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 accelerationprintf("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");}*/

/*#include <termios.h>
#include <unistd.h>
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#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 <termios.h>
#include <unistd.h>
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#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 */
/*————————————————*/

#ifndef KBHITh
#define KBHIThvoid init_keyboard(void);
void close_keyboard(void);
int kbhit(void);
int readch(void);#endif