Your question already contains the answer: why do you always open and close
it?
Am Dienstag, 8. September 2015 12:51:22 UTC+2 schrieb 멘지:
>
> FILE *bin;
> bin=fopen("header.bmp", "a");
> int fd_22=open("/sys/class/gpio/gpio22/value", O_WRONLY);
>
> for(k=0; k<153600; k++){
> fd_45=open("/sys/class/gpio/gpio45/value", O_RDONLY);
> fd_44=open("/sys/class/gpio/gpio44/value", O_RDONLY);
> fd_23=open("/sys/class/gpio/gpio23/value", O_RDONLY);
> fd_26=open("/sys/class/gpio/gpio26/value", O_RDONLY);
> fd_47=open("/sys/class/gpio/gpio47/value", O_RDONLY);
> fd_46=open("/sys/class/gpio/gpio46/value", O_RDONLY);
> fd_27=open("/sys/class/gpio/gpio27/value", O_RDONLY);
> fd_65=open("/sys/class/gpio/gpio65/value", O_RDONLY);
> write(fd_22, "0", 1);
> write(fd_22, "1", 1);
> bit_value=0;
> read(fd_45, &ch0, 1);
> read(fd_44, &ch1, 1);
> read(fd_23, &ch2, 1);
> read(fd_26, &ch3, 1);
> read(fd_47, &ch4, 1);
> read(fd_46, &ch5, 1);
> read(fd_27, &ch6, 1);
> read(fd_65, &ch7, 1);
> ch0 -= '0';
> ch1 -= '0';
> ch2 -= '0';
> ch3 -= '0';
> ch4 -= '0';
> ch5 -= '0';
> ch6 -= '0';
> ch7 -= '0';
> if(ch0) {bit_value |= (1<<0);}
> if(ch1) {bit_value |= (1<<1);}
> if(ch2) {bit_value |= (1<<2);}
> if(ch3) {bit_value |= (1<<3);}
> if(ch4) {bit_value |= (1<<4);}
> if(ch5) {bit_value |= (1<<5);}
> if(ch6) {bit_value |= (1<<6);}
> if(ch7) {bit_value |= (1<<7);}
>
> fprintf(bin , "%c", bit_value);
> close(fd_45);
> close(fd_44);
> close(fd_23);
> close(fd_26);
> close(fd_47);
> close(fd_46);
> close(fd_27);
> close(fd_65);
> }
>
>
> I making the camera from the Beagle bone black
> but, My source is very slow
>
> fopen fclose is because repeat in for(; ; )
> So I want to improve the speed.
>
> what should i do ?
>
>
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