SigmaStudio Toolbox

Hello REH,

Someone should add the example referenced but not included in the Wiki entry! Here's a pot example:

The Aux ADC converts a 0 - 3.3V pot input to a decimal (5.23) number between 0 and 1.0. Multiply this by integer (28.0) number 32 and you get a number between 0 and most likely 31, since integer multiplication rounds down. The lookup table has 33 rows between 0 and 32 -- one more than the expected input simply because I'm paranoid about over-running the table. Unless you use the Index Limit Protection version of the LUT (which burns more instructions), going over gives unpredictable results. The LUT output is a decimal number from 0 to 1 which is what the Loudness Control needs. The LUT rows are arranged to simulate a "log taper" volume control, as shown below:

After wiring your pot to the correct MP pin for the Aux ADC to be used, make the appropriate MP setting in the HW Register Controls tab (my -1701 board has a pot wired to Aux ADC 3):

The easiest way to handle an encoder is the Rotary Volume Control. Fill in its Lookup Table as above.

Best regards,

Bob

Ext-Loudness.dspproj

Thank you Bob,

I have been away from the office and just read your reply.

I am still on a SigmaStudio learning curve but will try to work through your examples.

Best regards,

Richard.