COFFEE-HOWTO: Software 3. Software3.1 SoftwareYou will have to build an executable that will perform like this:Get permissions to use I/O address space, by calling kernel, with the command ioperm: eg ioperm( BASE, range ,1);Perform an out request instruction, to set the 0-5V voltage to the parallel port, eg outb( 1, BASE );Wait for enough time so that coffee gets ready. It would be nice if that time is read by looking at the command line.Then it will turn off the coffee-machine: outb( 0 , BASE );Before ending it should give back the paraller port with a ioperm( BASE, range, 0);Change BASE = 0x3bc for /dev/lp0, 0x378 for /dev/lp1, and 0x278 for /dev/lp2, range=8.It would be nice if you had that program setuid, so that everybody can drink coffee!3.2 Device driverJust read kernel hacker's guide, implement a device driver (it could even be user space i think). Please, compile it as a module, so that we won't need a kernel compile in every update. Then write: echo cappuccino >/dev/coffeeAnd you will have a hot cup of coffee in 1 minute. Remember to give the right permission to /dev/coffee, depending on whether you want only root making coffee or not.The advantage of this method is that it supports feedback from the coffee-machine by using the ACK of parallel port, so that smart coffee-machines could produce an interrupt.Do it as homework.3.3 Connecting with the InternetIf you have implemented the C programme (see above), you just have to write down a simple CGI script to turn ON and OFF the coffee-machine. You should write some nice webpages, explaining how to make coffee, and put them at an apache web server... F

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