3 Replies Latest reply on May 6, 2018 11:43 PM by GeonaP_26

    em_EEPROM problem


      Psoc 4.2 updated the em_EEPROM element. Well, not updated, completely replaced with it

      with a new one that breaks all existing projects using it. It would have been far smarter (and nicer)

      if they had given it a different name.   The notes says it was done to meet customer expectations.

      That is true if the customer expects to be put in a bad spot and have to miss a critical deadline

      because the programmer thought things should be done differently.


      In any case, there is a major problem I have no idea how to fix. I have implemented the em_EEPROM

      element according to the new documentation. The symptom is that it reports success in writes but it

      mostly erases the contents and occasionally writes one of the parameters. The first write does nothing

      and leaves the values at the compile defaults. The second write destroys the contents. This all worked

      fine before the "upgrade". My first choice would be to get the old version back but that does not seem to

      be an option.



      static const uint8 eepromArray[Em_EEPROM_1_PHYSICAL_SIZE]


                                       {0x01, 0x05, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x03, 0x00, 0x00, 0x01, 0x00, 0x10,

                                        0x0f, 0x0f, 0x0f, 0xf6, 0xf6, 0xf6, 0xb3, 0x20, 0x05, 0x01, 0x01, 0x10, 0x04, 0x04, 0x03, 0x01,

                                        0x87, 0x00, 0x10, 0x00, 0x12, 0x34, 0x56, 0x78, 0x60, 0x0c, 0x01, 0x00, 0x00, 0x30,0xaa, 0x55


      In main()

      returnValue = Em_EEPROM_1_Init((int32)  &eepromArray[0]);


      Write and read routines

      uint8 writeeeprom(uint8 dta,uint8 offset){

         // uint8 status = Em_EEPROM_1_Write(&dta,&eepromArray[offset],1u);

          uint8 status = Em_EEPROM_1_Write((int32) offset,&dta,1u);

          return status;




      uint8 readeeprom(uint8 offset){

        //  uint8  volatile val = eepromArray[offset];

          uint8 val;

          uint8 status = Em_EEPROM_1_Read((int32) offset,&val ,1u);

          return val;



      Anybody make this work with a CY8C4245?



        • 1. Re: em_EEPROM problem

          Can you please post your complete project or a shortened version that shows the error so that we all can have a look at all of your settings. To do so, use

          Creator->File->Create Workspace Bundle (minimal)

          and attach the resulting file.



          • 2. Re: em_EEPROM problem

            Unfortunately I cannot post the project. I would have to build a version that I could use to demonstrate the problem

            and the time pressure is too great to take the day to do that. The settings for build were all default as were the settings on the component.


            I found a solution. In the Component catalog, there is a setting for "show all versions". The old version was there

            and i replaced V2 with V1.2, restored my code and everything works again. I also got back the 250 bytes of ram that

            the new one took so I could restore the features I had to remove to try to make the new one work.


            It still would be nice to know what is wrong with the component.

            • 3. Re: em_EEPROM problem

              Hello Doug Hogg,

              Emulated EEPROM v2.0 is a major revision of the component and please make use of this code example.


              Best Regards,

              Geona Mary