Honored Contributor
Honored Contributor<div class='quotetop'>QUOTE (babysnow @ Aug 11 2009, 11:20 AM) <{post_snapback}> (index.php?act=findpost&pid=23477)</div>
--- Quote Start --- I have checked many references. Some mentioned the idea of mailbox, which I think is very convenient.[/b] --- Quote End --- Ooops Mailboxes are a means to communicate between two CPUs, not between a Linux userland process and some hardware device. Of course a mailbox is a hardware device (i.e. a one stage FIFO, a multi-stage FIFO will provide more performance, if needed), so the Linux system needs a dedicated device driver (or something else) to decently access same from userland. <div class='quotetop'>QUOTE (babysnow @ Aug 11 2009, 11:20 AM) <{post_snapback}> (index.php?act=findpost&pid=23477)</div> --- Quote Start --- I have tried the sram, the read and write function runs well. The problem may be the specific characteristic of LED hardware.[/b] --- Quote End --- So the "LED" hardware really does not provide read access to the latch. -Michael
