extern void
persistfile( /* open persist file and lock it */
char *pfn
)
{
persistfd = open(pfn, O_WRONLY|O_CREAT|O_EXCL, 0644);
if (persistfd >= 0) {
persistfname = pfn;
pflock(1);
return;
}
/* file exists -- switch to i/o process */
persistfd = open(pfn, O_RDWR);
if (persistfd < 0) {
sprintf(errmsg, "cannot open persist file \"%s\"", pfn);
error(SYSTEM, errmsg);
}
pflock(1);
io_process(); /* never returns */
}
//SysTick Handler that will be called several times per second (see TICKS_PER_SECOND). This is an interrupt.
void SysTick_Handler() {
ticks++;
io_process(); //Process button presses
}
