EEPROM write with USB

[awdgsx]

I can send and receive data to the mcu. I'm using the usbout command for debugging right now. It sends 3 16 bi twords in one buffer to hyperterminal right now. I just can't figure out how to send a specific value to the mcu and have it wait for 256 byte of data and rewrite the contents of the eeprom with those values. I would also lite to dump the contents of the mcu eeprom back to my pc.

[mackrackit]

To start with, the DATA and EEPROM commands only work at compile time. Use READ and WRITE during run time.

Concept to receive data via USB then WRITE to eeprom.

Send a small array to the MCU then check the array for a specific value.
If the value is X the jump to a WHILE or DO loop.
Wait for data to be recieved that you want to WRITE to the eeprom.
Use a FOR/NEXT loop to loop through the array received via USB, (this will be a different array/buffer than before)
WRITING each byte of the array to the next address of the eeprom.
When finished change the variable X to another value that do not mean GOTO the DO loop.
RETURN to main program.

These may help
http://www.picbasic.co.uk/forum/show...rray+to+eeprom
http://www.picbasic.co.uk/forum/show...rray+to+eeprom
http://www.picbasic.co.uk/forum/showthread.php?t=544

I am not in a place to write code at the moment but you may get the idea.

[awdgsx]

I think this is what you intended for me to do.. I'm not sure how to advance the array location in the loop. You will see my comment in the code. Thank you again for the help!

 usbservice
doloop:
       inbyte = 1
       USBin 3, action, inbyte, doloop2        ' Get a char from usb port
verify:
       IF action = 102 THEN   ' Verify connection
       USBout 3, action, 1, verify
       ENDIF    ' end of verify action
     '  IF action = 117 THEN  ' Write EEPROM
     '  USBOUT 3, action, 1, doloop2
     '  tempval = 0
tlabel2:
     '  USBin 3, char, inbyte, tlabel2
     '  WRITE tempval, char
     '  USBout 3, char, 1, startloop
      ' tempval = tempval + 1
      ' IF tempval < 255 THEN tlabel2
     '  ENDIF ' end of Write action
valuesout:
       IF action = 99 THEN    ' Return last input and output
       USBout 3, mafout, 6, valuesout
       ENDIF ' end of IO action
       IF action = 107 THEN   ' Dump EEPROM
       tempval = 0
Dumploop:
       Read tempval, epromdump[0]  'epromdump is a 256 byte array
        tempval = tempval + 1 'advance to the next eeprom location 
        'not sure how to advance places in the array for the new eeprom value
        USBout 3, epromdump, 256, dumploop

[Demon]

'not sure how to advance places in the array for the new eeprom value

Check at the front of the PBP manual on arrays. You use a FOR loop to scan through the array, using a variable as position pointer.

Have you considered using Darrel's USB interrupt routine?
http://darreltaylor.com/DT_INTS-18/home.html

Robert

[mackrackit]

DATA @1,$31,$32,$33,$34,$35,$36,$37,$38,$39,$30
   X = 0
   PAUSE 5000 : Pause 5000   'TIME TO START TERMINAL
idleloopq:
FOR X = 1 TO 10
    READ X,BUFFER
    USBOut 3, buffer, 1, idleloopq
	PAUSE 250
	NEXT
	END

[Demon]

Just make sure you don't have a big pause after USB started, probably going to lose connection.

Robert

[mackrackit]

Just make sure you don't have a big pause after USB started, probably going to lose connection.

Robert

I should have mentioned that my USBSERVICE is interrupt driven so PAUSE does not matter.