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Several people have asked me about HH2 boards. I have built the first prototype and am now trying to get the PIC code written. I've run into 2 issues.
First, I screwed up in assigning the TX pulse to the GP3 pin. Turns out this is an input-only pin (RTFDS!). Fortunately, the PCB mod to fix this is pretty easy.
Second, I'm having trouble getting the interrupt timers to work right. I think the main loop timer is now working but the delay timer has tons of jitter on it. I suspect it's because I'm trying to use it near its minimal delay (~15us) and don't have enough setup time.
I have a few ideas to fix the software, then I can complete the testing of the PCB. With luck, I will be done this week and can then provide PCBs.
- Carl
First, I screwed up in assigning the TX pulse to the GP3 pin. Turns out this is an input-only pin (RTFDS!). Fortunately, the PCB mod to fix this is pretty easy.
Second, I'm having trouble getting the interrupt timers to work right. I think the main loop timer is now working but the delay timer has tons of jitter on it. I suspect it's because I'm trying to use it near its minimal delay (~15us) and don't have enough setup time.
I have a few ideas to fix the software, then I can complete the testing of the PCB. With luck, I will be done this week and can then provide PCBs.
- Carl
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