Assorted items: - not to belittle the pure joy and excitement of watching paint dry, but monitoring a battery's epic journey towards inevitable doom is so much more rewarding:
http://downloads.qi-hardware.com/people/werner/anelok/tmp/cr2032-510h.png So last week's drop was caused by the cold weather, not the battery showing first signs of weakness. Now that summerly temperatures are back, so is the battery voltage. To be continued ... - then there is an ugly truth I hadn't revealed yet: sometimes, the display of Anelok would look like this: http://downloads.qi-hardware.com/people/werner/anelok/tmp/chaotic-display.jpg I thought that this may have been caused by timing issues in the communication between MCU and OLED, but I was a little worried by me already having verified the timing some time ago without finding any problem - which would then suggest a more fundamental flaw. Well, while playing with the slider, I noticed that this sort of pattern would reproducibly occur at the same positions when scrolling. As we know, if you can reproduce it, you can fix it. So I did ... It turned out to be a missing sanity check in my bit blit function, which allowed it to attempt to draw things that were completely off-screen. With that fixed, I haven't seen any more such corruptions, and I sleep a lot better now :) Note that this is different from the signal integrity issues caused by voltage mismatch between MCU and OLED. That still needs solving, but it's pretty clear what's happening there. - I've updated the hardware evolution diagram: http://downloads.qi-hardware.com/people/werner/anelok/tmp/evol-hw-201502.pdf The previous version (April 2014, how time flies) is here: http://downloads.qi-hardware.com/people/werner/anelok/tmp/evol-hw.pdf The differences: - CPU: added the "dual processor" (KL16+KL26) combo as future development possibility. - USB device: added using a Micro B receptacle (instead of Micro AB) as something to consider. - slider: while a bit more tuning will be needed, it looks good enough nowadays that I think we can safely bury the wheel. - RF-kill: the brute simplicity of shorting RF VDD to ground shall be the way to go. So this leaves testing operation on CR2032 as the last major open issue. - meanwhile, Xiangfu sent these pictures: http://downloads.qi-hardware.com/people/xiangfu/anelok/tmp/Anelok-3-brds.jpg http://downloads.qi-hardware.com/people/xiangfu/anelok/tmp/Anelok-led-on.jpg The second one shows that the capacitive slider now works on these boards, too. - Werner _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
