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Old 11-27-2013, 02:25 AM   #1
georgewhr
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Registered: Nov 2012
Location: SF Bay Area
Posts: 47

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can't open a spi device in /dev


I manually insmod spidev(device driver) and spi_bcm2708(controller driver) successfully.
In "/proc/devices" shows the spi major number is 153, I did"mknod /dev/spidev0.0 c 153 0". Trying to test whether I can open the device,which points to spidev module.

I write a simple test program to try to open the deivice, however it failed, the file descriptor is less than 0

Any people know why I can't open a device ?

#include <stdio.h>

#define device "spidev0.0"

void main(int argc,char **argv)
{
int fd = open(device,argv);
if(fd<0)
printf("cant");


}
 
  


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