Hi Molly, On Mon, 10 Aug 2020, 3:31 am 'Molly Smith' via [email protected], < [email protected]> wrote:
> > Hello, > > I'm trying to get 8-bit real values from the katADC yellow block in > Simulink. I was wondering why the block outputs fixed 8.7 bit values > instead? I found the following explanation on one of the CASPER wikis but > I'm still confused. > > "The ADC block converts analog inputs to digital outputs. Every clock > cycle, the inputs are sampled and digitized to 8 bit binary point numbers > in the range of -1 to 1 and are then output by the ADC. This is achieved > through the use of two's-compliment representation with the binary point > placed after the seven least significant bits. This means we can represent > numbers from -128/128 through to 127/128 including the number 0. Simulink > represents such numbers with a fix_8_7 moniker. " > > Does it make sense to use a reinterpret block to convert it back to 8-bits? > To be clear, the numbers are 8 bits already, they've just been divided by 2**7 to normalize to the range +/-1. That said, yes, a reinterpret block would let you rescale to integer values between -128 and 127 if this is what you want. As Dan warns, this might have further downstream implications in your design. Cheers Jack > Thanks, > Molly > > -- > You received this message because you are subscribed to the Google Groups " > [email protected]" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/d197809c-a3a9-4618-9b0f-bcafaaf4c1a7n%40lists.berkeley.edu > <https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/d197809c-a3a9-4618-9b0f-bcafaaf4c1a7n%40lists.berkeley.edu?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "[email protected]" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAG1GKSnm4vCAg8kp%2BrE80cdS%3D5W7KJEMZvBTznQYJQHq8VMkFQ%40mail.gmail.com.
