Hi! On 13:29 Wed 18 Feb , Troy, Willis wrote: > Howdy, > > I am fairly new to device drivers and this list, but I'm sure someone in here can help me. > > First, some background. I am working on device drivers for a FPGA that is currently running kernel 2.6.28, because it is an FPGA I can add custom hardware. The custom hardware I currently have is very simple- just a multiplier- for a proof of concept. Currently I have a char device driver written for it that will take in ascii and multiply its ascii value by another ascii value. Eg. 0x0=char(0)*char(0)=48*48. This isn't really what I want, I want a device driver that can read in two 32 bit numbers and return a 32 bit number. > > So, can I write integers/longs to a character device driver? Is there a better way to do this? 1) Convert the number to little/big endian 2) cast the int to a "char *" using the addressof operator+typecast 3) call write(fd, "your casted int", 4) When reading the result: 1) declare an int 2) cast this int to a char * 3) call read 4) convert from little/big endian to mashine byte order DO NOT DECLARE "char[4]" AND CAST THIS TO AN "int *". THIS WILL FUNCTION ON SOME MACHINES, BUT NOT ALL. -Michi -- programing a layer 3+4 network protocol for mesh networks see http://michaelblizek.twilightparadox.com -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
