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Protoboard, can load RAM but cant load EEPROM? — Parallax Forums

Protoboard, can load RAM but cant load EEPROM?

CrosswindsCrosswinds Posts: 182
edited 2011-09-09 20:35 in Propeller 1
Hi guys!


Have finished soldering everything up on my latest protoboard. Everything works, but i just cant load the EEPROM, just load the RAM.


Its not the PC because i can load the Prof. Developmentboard without a glitch.

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2011-09-08 10:52
    Check the area around the EEPROM for shorts. Carefully touch up the solder connections on the EEPROM. Once your program is loaded into the RAM and the PC tells the bootloader to copy it to the EEPROM, the Prop does all the work.

    Was there some kind of program in the EEPROM already? If so, did it work? If the Prop can read from the EEPROM, it should be able to write to it unless the /WP pin on the EEPROM isn't connected properly.
  • RaymanRayman Posts: 14,999
    edited 2011-09-08 10:58
    Did you solder anything to P28 or P29? That's the I2C bus pins that the eeprom is on...
  • SapiehaSapieha Posts: 2,964
    edited 2011-09-08 11:00
    Hi.

    Check You have an EEProm that are 32 KBytes else bigger

    Crosswinds wrote: »
    Hi guys!


    Have finished soldering everything up on my latest protoboard. Everything works, but i just cant load the EEPROM, just load the RAM.


    Its not the PC because i can load the Prof. Developmentboard without a glitch.
  • CrosswindsCrosswinds Posts: 182
    edited 2011-09-08 12:27
    Mike Green wrote: »
    Check the area around the EEPROM for shorts. Carefully touch up the solder connections on the EEPROM. Once your program is loaded into the RAM and the PC tells the bootloader to copy it to the EEPROM, the Prop does all the work.

    Was there some kind of program in the EEPROM already? If so, did it work? If the Prop can read from the EEPROM, it should be able to write to it unless the /WP pin on the EEPROM isn't connected properly.

    Hello Mike!

    The EEPROM looks great. and this is a brand new board. But i think rayman have the answer. I have wired a button-input to the P29 -.-
    Rayman wrote: »
    Did you solder anything to P28 or P29? That's the I2C bus pins that the eeprom is on...

    Mygod, i have wired a button in-put to P29. I certainly dont hope i have ruined the EEPROM now?

    Feel really stupid. i assumed that the EEPROM-input pins were some of the unmarked ones on the board.

    My ignorance.
    Sapieha wrote: »
    Hi.

    Check You have an EEProm that are 32 KBytes else bigger

    Its the standard one that is surfacemounted!
  • blittledblittled Posts: 681
    edited 2011-09-09 20:35
    You probably didn't ruin the eeprom but you could've pulled the data line of the I2C buss to either 1 or 0 depending if the switch is connect to 3.3V or GND. This would cause the eeprom to fail. If you connected this line directly to 5 V then some damage could've happened.
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