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Hi Mike,

i have a problem with program EEPROM on dspic 30F3013.

i don't understand why i can program or erase EEPROM

i can read value that i have sent with ICD2

do you know what happen?

you can find my code below!

in debug mode , i can't see the value in NVMKEY ( 0x55 then 0xAA ), and NVMCOM,#WR keep '0'

can you help me !

  mov  #tblpage(posit_P1),w0
  mov  w0,NVMADRU
  mov  #tbloffset(posit_P1),w0
  mov   w0,NVMADR
  call CEEPROM
  MOV  #tblpage(posit_P1),W0
  MOV  W0,TBLPAG
  MOV  #tbloffset(posit_P1),W0
  call EEEPROM

CEEPROM:
  ; Setup NVMCON to erase one word of data EEPROM
  mov  #0x4044,w0
  MOV  w0,NVMCON
  ; Disable interrupts while the KEY sequence is written
  PUSH  SR
  MOV  #0x00E0,W0
  IOR  SR
  ; Write the KEY sequence
  MOV  #0x55,W0
  MOV  W0,NVMKEY
  MOV  #0xAA,W0
  MOV  W0,NVMKEY
  nop
  nop
  ; Start the erase cycle
  BSET  NVMCON,#WR
  nop
  nop
CEE1:
  ; attente fin ecriture
  btsc    NVMCON,#WR
  goto    CEE1  ; Re-enable interrupts
  POP  SR
  return

EEEPROM:
  ; Write data value to holding latch
  TBLWTL  W2,[ W0]
  ; NVMADR captures write address from the TBLWTL instruction.
  ; Setup NVMCON for programming one word to data EEPROM
  MOV  #0x4004,W0
  MOV  W0,NVMCON
  ; Disable interrupts while the KEY sequence is written
  PUSH  SR
  MOV  #0x00E0,W0
  IOR  SR
  ; Write the key sequence
  MOV  #0x55,W0
  MOV  W0,NVMKEY
  MOV  #0xAA,W0
  MOV  W0,NVMKEY
  nop
  nop
  ; Start the write cycle
  BSET  NVMCON,#WR
  nop
  nop
EEE1:
  ; attente fin ecriture
  btsc    NVMCON,#WR
  goto    EEE1
  ;Re-enable interrupts, if needed
  POP  SR
  return

Thanks for the quick response, Mike

Logger permanently connected (when in use), no battery/PSU.

Data constantly passed to PC for processing, only storage necessary if PC doesn't respond in time, (unlikely).

So sufficient storage for 40 16 bit words would be OK.

If the PC can't handle this we'll order a new PC

10 bit ADC is also OK for this app.

The device is only used as and when required and only with PC connected running its own logging/display software.

Battery not needed. Nice idea tho'

Peter

Bonjour Gérard,

Avez-vous correctement initialisé les bits de configuration dans votre logiciel ? (non protection de l'E2PROM)

Il existe également des tutoriels sur les dsPIC30 sur internet :

*  http://asl.epfl.ch/index.html?content=education/courses/MicroInfo/

* http://electronique.marcel.free.fr/#dsPIC_Microchip

* http://www.securistreet.com/dri/dsp/support_cours_dsp.html

Je vous encourage à poster votre question sur site de support technique de Microchip : http://support.microchip.com et/ou (plus rapide) sur le forum microchip dédié au dsPIC30 : http://www.microchip.com/forums/f153.aspx

Salutations

Hello Mike,

I was very curious in studying about how the railway signalling actually processed. I got a question that ,

1)If the Railway track is broken / blasted / Crack , say 100-150 kms ahead, then how the Locomotive Driver will get to know about this?

Is there a wireless communication through which the locomotive driver get the information?

Are there any communication module developped already which is available in market?

2) Do we have any Technology to detect this and avoid accidents?

3) Do we have any equipment to do this job?

For Aircrafts & ships  , we have Radar and other sources of signalling on the safety needs, Likewise please provide me awhether there any equipments or technology available to indentify Railway track Cracks/ damage ,before the train crosses the point where the track is cracked/damaged , So that it can avoid railway accidents.

Bonjour,

            J'ai eu comme très bon conseil d'utiliser un PIC32 80mhz avec port USB pour le transfert des informations vers mon ordinateur. J'ai besoin de ce MCU pour controler des IR LED emetteur et photodecteur. Le board ayant les emetteurs, il y aura un 4-to-16 Decoder par 14 IR LED ainsi qu'un Darlington Array par 7 IR LED. Le board receveur aura un 1-to-16 Decoder par 14 IR LED ainsi qu'un QUAD Comparator par 28 IR LED. Je voulais savoir s'il n'aura pas de problème à gérer tout ça. Aussi, je voulais savoir ce que vous pensiez du board "Cerebot_32MX4" qui possède déjà un bon modèle de PIC32 avec communication USB et Package déjà près pour recevoir les cables sans soudure et facile d'utilisation.

Dernière question, je voulais m'assurer que les IR LED Photodetector se connecte bien sur les 2 ports I2C. Je ne sais pas par exemple ou connecter les cables pour aller vers les IR LED emetteur.

Merci

David

Bonjour Mr MORIN,

Il est difficile de répondre à vos questions sans informations plus précises sur les composants que vous souhaitez utiliser :

1/ quelle référence de PIC32 ?

2/ Quels IR detector (lien vers la datasheet) ?

Concernant la carte Cerebot_32MX4, je pense que ce module industriel est une excellente base de départ pour développer.

La puissance des PIC32 est amplement suffisante pour ce que vous souhaitez faire.

Vous pouvez également acheter cette carte sur MicrochipDirect. Digilent propose tout un tas de modules pmod pour étendre le Cerebot_32MX4

Des formations sur les PIC32 sont régulièrement proposées au centre de formation de Microchip France si vous souahitez démarrer rapidement avec cette architecture.

salutations

hi,

   do u have any automaitc room light control project with people counter using microcontroller? if u have, can u possibly send it to me? thanks.

Hi Mike

I am currently doing a project with consist of a PIC18F4550(host) and a ZG2100M(wifi module/slave).

I want to do a simple testing such that the host will prompt the slave to send a data to my desktop through wireless. After receiving the data at the desktop, the desktop will display the data sent.

Due to budget constraint, i solder the board out from the data sheet(see attached page 20) provided by microchip for the ZG2100M. After soldering, i wanted to connect the host to the slave and do a simple testing.

But there a some doubts.

1. Do I connect my host SDI to slave SDO or do i connect my host SDI to  slave SDI?

2. Does the Slave have a SSID or do I assign an IP address to it so that my desktop could recognise the slave? If I were to assgin an IP address to it, how must I do so?

3. To start the programming for SPI in mplab, i will need the header file for spi am I right?

4. How should I start writing the program? Do you have any demo program which can help me?

Thank You very much

Attachments:

ZG2100MC.pdf

Hi Calvin,

I think you're gonna have some trouble with PIC18F4550 because its Flash memory size will likely be too small...

Remember that if you use the ZG2100M WiFi module, only the WiFi protocole (802.11b) is running on the module.

You still need to run the TCP/IP on the PIC itself.

You'll be able to access high level functions through APIs.

2 recommendations from my side :

a/ The ZG2100M module has been updated. It's new reference is : MRF24WB0MA

The main difference is that the new one uses less ressources. However, the old one is not anymore compatible with the new TCP/IP stack >= v5.25

http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2884

So if you want to use the old one you must use TCP/IP stack <= v5.20

The TCP/IP stack belongs to the free Microchip Application Libraries package which can be downloaded here.

b/ However I have a much better recommendation which will save you a lot of work : I strongly suggest that you use the open source embedded WiFi project Flyport from OpenPicus.

If you want to have also USB, it's easy because the PIC24FJ256GA106 can be replaced by the PIC24FJ256GB106 which adds USB connectivity

Free versions of the Microchip compilers can be downloaded here and MPLAB can be downloaded here.

regards