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I am using ts7800 board I am usind SD card for booting ,when I run below adc code I got the error: :~$ ./adc adc: adc.c:13: main: Assertion `fd != -1' failed. Aborted how to remove this error. CODE: #include<unistd.h> #include<sys/types.h> #include<sys/mman.h> #include<stdio.h> #include<fcntl.h> #include<assert.h> int main(int argc, char **argv) { volatile unsigned short * complete; volatile unsigned char * lsb, * msb, * control; int res; int fd = open("/dev/mem", O_RDWR); assert(fd != -1); lsb = control = (unsigned char *)mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0x10c00000); msb = lsb + 1; complete = (unsigned short *)mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0x10800000); *control = 0x41; while ((*complete & 0x80) != 0); res = *lsb; res |= *msb << 8; printf("result: %d\n", res); close(fd); return 0; } __._,_.___
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