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Re: [Amforth] documentation error
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From: Tristan W. <ho...@tj...> - 2020-06-19 13:15:25
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Hello Brian, Welcome to the list. Seems like you got a bargain. I was surprised to see I could still buy a new AVR butterfly in the UK, but it would cost me quite a bit more than 8 USD! > How would I submit this as a patch for the documentation? Emailing this mailing list is the way I have done it in the past. Best wishes, Tristan On 16Jun20 20:46, Brian wrote: > begin > ASSR c@ > 1 2 lshift \ TCN2UB > 1 0 lshift or \ TCR2UB > 1 1 lshift or \ OCR2UB > and > until > > I am new to the forth world and i'm loving it. I was on the newark ( an > electronics parts distributor ) a few months ago and they were selling > avrbutterflys for 8 US dollars. So I bought a few and while thinking about > what to do with them I found forth and fell into the rabbit hole. That being > said, in the cookbook section/popular boards/avr butterfly section it gives > an rtc example code. The problem is that the above loop should wait until > those three registers are 0. If you leave a 0 on the stack you end up in an > infinite loop, and yet surprisingly the +32kHz function that loop comes from > works. Well if you dump the ASSR register value ( using .s ) you see that > the first look at the register that the TCRTUB flag is set so the value on > the stack is one and the loop ends. This is not what the exit condition you > want for this loop. Those last three bits in ASSR should be 0 according to > the data sheet for the atmega169 (and I also for the atmega328) before > moving on. A simple fix is: > > begin > ASSR c@ > 1 2 lshift \ TCN2UB > 1 0 lshift or \ TCR2UB > 1 1 lshift or \ OCR2UB > and > 0= \ add this line > until > > How would I submit this as a patch for the documentation? > Thanks, > Brian-in-ohio > > ps used this loop to see the values on the stack > begin > ASSR c@ > 1 2 lshift \ TCN2UB > 1 0 lshift or \ TCR2UB > 1 1 lshift or \ OCR2UB > bin .s cr hex > and > 0= > until > > > > _______________________________________________ > Amforth-devel mailing list for http://amforth.sf.net/ > Amf...@li... > https://lists.sourceforge.net/lists/listinfo/amforth-devel |
