1701 LOOKUP TABLE PROBLEM

Thanks Bob,

you are always kind and above all experienced.

Now I have also understood other problems of my LookupTables

A good weekend.

Thanks

Piero

Hello piero,

You can work around this problem by replacing your Rising Edge Toggle Counter with a Falling Edge Toggle Counter, and also un-checking the Invert box for GPIO_9 so the button S6 works as before. The problem you're experiencing appears to have several causes, explained below:

The Toggle Counter gets its initial state from the Interface Read. For some reason, its Rising Edge version adds 1 to this read, or else counts one toggle just from powering up. Either way, the count starts at 1, even though the initial state read as zero. This is why your lookup table is stuck on its second entry. In contrast, the Falling Edge version of Tcount works correctly.

Also, the Interface Read value is not necessarily zero, but is supposed to be the count that was saved in EEPROM when the circuit was last powered down. This function doesn't work in the -1701MINZ -- for more info, please see https://ez.analog.com/message/23440#23440

I attached your project circuit with these three changes:

Substituting the Falling-Edge Tcount for the Rising-Edge version

Not inverting GPIO_9 to drive the Falling-Edge Tcount

Instruction Length set to 2X (512 instructions) to match your project's 96K sample rate

Best regards,

Bob