C Programming -> delay action
I'm not really familar with c code, so I have some problems to get a given code customized. It is a shutdown button code for a raspberry pi. GPIO has high as long as nobody presses the button. Everthing worked fine until I added an USV. Since I have connected it, the level of the GPIO fall down from time to time, only a very short time. So I tried to set a delay for the shutdown action, but it doesn't work in severals ways I have tried.
This is the relevant part of the script; it is not working anymore. The pressed button is not recognised anymore.
while(1) {
memset(rdbuf, 0x00, RDBUF_LEN);
lseek(fd, 0, SEEK_SET);
ret=poll(&pfd, 1, POLL_TIMEOUT);
if(ret<0) {
logging(LOG_CRIT,"error polling interrupt - exiting");
close(fd);
exit(EXIT_FAILURE);
}
if(ret==0) {
continue;
}
ret=read(fd, rdbuf, RDBUF_LEN-1);
/*Errorhandling*/
if(ret<0) {
logging(LOG_CRIT,"error reading gpio - exiting");
exit(EXIT_FAILURE);
} else {
if (ret==0) {
logging(LOG_INFO,"Got interrupt from shutdown key. Checking delay");
if ( delay == 9 ) {
logging(LOG_INFO,"got interrupts from shutdown key, shutting down now");
system("shutdown -h now");
exit(0);
} else {
/* oss << "got interrupt from shutdown key*/
char buffer[1024];
snprintf(buffer, sizeof(buffer), "Got interrupt from shutdown key, Counter not 10 (%i). Shutdown delayed...", delay);
logging(LOG_INFO,buffer);
delay++;
}
} else {
logging(LOG_INFO,"No interrupts from shutdown key. Checking Delay.");
if ( delay >= 1 ) {
char buffer[1024];
snprintf(buffer, sizeof(buffer), "Counter: %i Signal unterbrochen. Setze Counter zurück.", delay);
logging(LOG_INFO,buffer);
delay = 0;
}
}
}
}
What is the difference between poll and read?
My idea is that delay counts up as long as GPIO is pressed (0) if it is 9 (or anything that will be about one second in runtime) the script should shut down the raspi. If the button is no longer pressed, delay must set back to zero. This is what never worked. I managed to delay the shutdown, but delay was counting up over days.
Thanks for your help.
raspbian
asked Nov 22 '18 at 8:42
Dirk SchnickDirk Schnick
85
migrated from serverfault.com Nov 22 '18 at 8:53
This question came from our site for system and network administrators.
add a comment |
I'm not really familar with c code, so I have some problems to get a given code customized. It is a shutdown button code for a raspberry pi. GPIO has high as long as nobody presses the button. Everthing worked fine until I added an USV. Since I have connected it, the level of the GPIO fall down from time to time, only a very short time. So I tried to set a delay for the shutdown action, but it doesn't work in severals ways I have tried.
This is the relevant part of the script; it is not working anymore. The pressed button is not recognised anymore.
while(1) {
memset(rdbuf, 0x00, RDBUF_LEN);
lseek(fd, 0, SEEK_SET);
ret=poll(&pfd, 1, POLL_TIMEOUT);
if(ret<0) {
logging(LOG_CRIT,"error polling interrupt - exiting");
close(fd);
exit(EXIT_FAILURE);
}
if(ret==0) {
continue;
}
ret=read(fd, rdbuf, RDBUF_LEN-1);
/*Errorhandling*/
if(ret<0) {
logging(LOG_CRIT,"error reading gpio - exiting");
exit(EXIT_FAILURE);
} else {
if (ret==0) {
logging(LOG_INFO,"Got interrupt from shutdown key. Checking delay");
if ( delay == 9 ) {
logging(LOG_INFO,"got interrupts from shutdown key, shutting down now");
system("shutdown -h now");
exit(0);
} else {
/* oss << "got interrupt from shutdown key*/
char buffer[1024];
snprintf(buffer, sizeof(buffer), "Got interrupt from shutdown key, Counter not 10 (%i). Shutdown delayed...", delay);
logging(LOG_INFO,buffer);
delay++;
}
} else {
logging(LOG_INFO,"No interrupts from shutdown key. Checking Delay.");
if ( delay >= 1 ) {
char buffer[1024];
snprintf(buffer, sizeof(buffer), "Counter: %i Signal unterbrochen. Setze Counter zurück.", delay);
logging(LOG_INFO,buffer);
delay = 0;
}
}
}
}
What is the difference between poll and read?
My idea is that delay counts up as long as GPIO is pressed (0) if it is 9 (or anything that will be about one second in runtime) the script should shut down the raspi. If the button is no longer pressed, delay must set back to zero. This is what never worked. I managed to delay the shutdown, but delay was counting up over days.
Thanks for your help.
raspbian
asked Nov 22 '18 at 8:42
Dirk SchnickDirk Schnick
85
migrated from serverfault.com Nov 22 '18 at 8:53
This question came from our site for system and network administrators.
add a comment |
I'm not really familar with c code, so I have some problems to get a given code customized. It is a shutdown button code for a raspberry pi. GPIO has high as long as nobody presses the button. Everthing worked fine until I added an USV. Since I have connected it, the level of the GPIO fall down from time to time, only a very short time. So I tried to set a delay for the shutdown action, but it doesn't work in severals ways I have tried.
This is the relevant part of the script; it is not working anymore. The pressed button is not recognised anymore.
while(1) {
memset(rdbuf, 0x00, RDBUF_LEN);
lseek(fd, 0, SEEK_SET);
ret=poll(&pfd, 1, POLL_TIMEOUT);
if(ret<0) {
logging(LOG_CRIT,"error polling interrupt - exiting");
close(fd);
exit(EXIT_FAILURE);
}
if(ret==0) {
continue;
}
ret=read(fd, rdbuf, RDBUF_LEN-1);
/*Errorhandling*/
if(ret<0) {
logging(LOG_CRIT,"error reading gpio - exiting");
exit(EXIT_FAILURE);
} else {
if (ret==0) {
logging(LOG_INFO,"Got interrupt from shutdown key. Checking delay");
if ( delay == 9 ) {
logging(LOG_INFO,"got interrupts from shutdown key, shutting down now");
system("shutdown -h now");
exit(0);
} else {
/* oss << "got interrupt from shutdown key*/
char buffer[1024];
snprintf(buffer, sizeof(buffer), "Got interrupt from shutdown key, Counter not 10 (%i). Shutdown delayed...", delay);
logging(LOG_INFO,buffer);
delay++;
}
} else {
logging(LOG_INFO,"No interrupts from shutdown key. Checking Delay.");
if ( delay >= 1 ) {
char buffer[1024];
snprintf(buffer, sizeof(buffer), "Counter: %i Signal unterbrochen. Setze Counter zurück.", delay);
logging(LOG_INFO,buffer);
delay = 0;
}
}
}
}
What is the difference between poll and read?
My idea is that delay counts up as long as GPIO is pressed (0) if it is 9 (or anything that will be about one second in runtime) the script should shut down the raspi. If the button is no longer pressed, delay must set back to zero. This is what never worked. I managed to delay the shutdown, but delay was counting up over days.
Thanks for your help.
raspbian
asked Nov 22 '18 at 8:42
Dirk SchnickDirk Schnick
85
I'm not really familar with c code, so I have some problems to get a given code customized. It is a shutdown button code for a raspberry pi. GPIO has high as long as nobody presses the button. Everthing worked fine until I added an USV. Since I have connected it, the level of the GPIO fall down from time to time, only a very short time. So I tried to set a delay for the shutdown action, but it doesn't work in severals ways I have tried.
This is the relevant part of the script; it is not working anymore. The pressed button is not recognised anymore.
while(1) {
memset(rdbuf, 0x00, RDBUF_LEN);
lseek(fd, 0, SEEK_SET);
ret=poll(&pfd, 1, POLL_TIMEOUT);
if(ret<0) {
logging(LOG_CRIT,"error polling interrupt - exiting");
close(fd);
exit(EXIT_FAILURE);
}
if(ret==0) {
continue;
}
ret=read(fd, rdbuf, RDBUF_LEN-1);
/*Errorhandling*/
if(ret<0) {
logging(LOG_CRIT,"error reading gpio - exiting");
exit(EXIT_FAILURE);
} else {
if (ret==0) {
logging(LOG_INFO,"Got interrupt from shutdown key. Checking delay");
if ( delay == 9 ) {
logging(LOG_INFO,"got interrupts from shutdown key, shutting down now");
system("shutdown -h now");
exit(0);
} else {
/* oss << "got interrupt from shutdown key*/
char buffer[1024];
snprintf(buffer, sizeof(buffer), "Got interrupt from shutdown key, Counter not 10 (%i). Shutdown delayed...", delay);
logging(LOG_INFO,buffer);
delay++;
}
} else {
logging(LOG_INFO,"No interrupts from shutdown key. Checking Delay.");
if ( delay >= 1 ) {
char buffer[1024];
snprintf(buffer, sizeof(buffer), "Counter: %i Signal unterbrochen. Setze Counter zurück.", delay);
logging(LOG_INFO,buffer);
delay = 0;
}
}
}
}
What is the difference between poll and read?
My idea is that delay counts up as long as GPIO is pressed (0) if it is 9 (or anything that will be about one second in runtime) the script should shut down the raspi. If the button is no longer pressed, delay must set back to zero. This is what never worked. I managed to delay the shutdown, but delay was counting up over days.
Thanks for your help.
raspbian
raspbian
asked Nov 22 '18 at 8:42
Dirk SchnickDirk Schnick
85
asked Nov 22 '18 at 8:42
Dirk SchnickDirk Schnick
85
asked Nov 22 '18 at 8:42
Dirk SchnickDirk Schnick
85
asked Nov 22 '18 at 8:42
Dirk SchnickDirk Schnick
85
asked Nov 22 '18 at 8:42
Dirk SchnickDirk Schnick
85
85
migrated from serverfault.com Nov 22 '18 at 8:53
This question came from our site for system and network administrators.
migrated from serverfault.com Nov 22 '18 at 8:53
This question came from our site for system and network administrators.
add a comment |
add a comment |
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