6 Replies Latest reply on Jan 13, 2014 7:35 AM by user_14586677

    TX-RX

    souleymane.gueye

      Hello
      I want to transmit an audio sign from a PSOC to another. I think i do all assignment related to the datsheets, but on the first Psoc output, i don't find the result expected
       

        • 1. Re: TX-RX
          souleymane.gueye

          There is the project with TX modul

          • 2. Re: TX-RX
            souleymane.gueye

            And the RX modul

            • 3. Re: TX-RX
              user_78878863

              Btw: this is the PSoC3 forum, but your project seem to belong to the PSoC1...

                 

              Can you try to check with a scope or logic analyzer what really gets transmitted? This will help you to see whether the problem is on the receiving or the transmitting end. You might also connect the transmitter to a PC an check with e.g. RealTerm whether the correct data gets transmitted.

              • 4. Re: TX-RX
                user_14586677

                You posted in PSOC 3 forum, design is PSOC 1.

                   

                 

                   

                The analog column clock for the DelSig must be same clock as PWM

                   

                portion of delsig, you currently have VC2, VC1 respectively which

                   

                will not allow DelSig to work correctly.

                   

                 

                   

                For Tx properties, set clcksync to "Sync to SysClk"

                   

                 

                   

                 

                   

                 

                   

                Regards, Dana.

                • 5. Re: TX-RX
                  user_14586677

                  Also keep in ming this constraint -

                     

                   

                     

                  The clock rate must be set to eight times the desired bit transmit rate. One data bit is transmitted out every 10 input clocks.

                     

                   

                     

                  Looking at Tx side keep in mind PGA is not R-R, from datasheet -

                     

                   

                     

                  The input and output voltage ranges of the amplifier do not extend to the power supplies (i.e., they are not "rail-to-rail" opamps). The allowed input range is a combination of input limit, output limit, power supply voltage, analog ground value, and selected gain. This is illustrated in the DC and AC Electrical Characteristics section.

                     

                   

                     

                  Also the input range needs to be offset to Vdd/2 for max dynamic range, attached various methods

                     

                  of accomplishing that -

                     

                   

                     

                  Regards, Dana.

                  • 6. Re: TX-RX
                    user_14586677

                    Lastly both side TxRx physical layer must be same, so if RS232 you

                       

                    must have level translators on both sides. If TTL direct connection OK.

                       

                     

                       

                    Regards, Dana.