Problem with MMC card initialization in Proteus

[harish.n.j]

Hi all,
i am planning to work with data storing in mmc card, am using PIC controller. I have even Driver which is provided by CCS. but when i try to simulate with Proteus. while designing circuit , it asks for image file, i have no idea about it ? , i have come across a similar thread asking this imag file, but it dont seems to be providing a right solution for me
wat are the initial parameters must be done to use MMC card with Proteus?


thanks in advance !

 

[engr.waqas]

Re: sd card doubt

Attached is image file.
Rename it with extension ".mmc" as edaboard does not allow to upload a file with this extension so i changed its extension.

 

[engr.waqas]

Re: sd card doubt

probably it could not be attached,if u give me your email i can send u the file

 

[harish.n.j]

Re: sd card doubt

Thanks waqas, I have sent u my email address to ur personal message.

could anyone provide me some link to any sample application regarding using proteus sd card

 

[engr.waqas]

Re: sd card doubt

Card image file sent to your email.
I would suggest u to use mikroC compiler.It has example code for interfacing with SD card and schematic too.

 

[harish.n.j]

Re: sd card doubt

am searching for a link to download MikroC found a link but its 14 MB size but it does not contain any examples, it would be great if u provide the link where i can download the examples... thanks waqas for ur quick reply !

 

[harish.n.j]

Re: sd card doubt

hey waqas thanks a lot man !

but does this file contains library files also

 

[engr.waqas]

Re: sd card doubt

yup...install compiler and then see examples files

 

[harish.n.j]

Re: sd card doubt

hey waqas, thanks man this mikro C seems to be gr8, and the other prgms along with it seems to be rocking.. am going to work on it this weeknd .

 

[engr.waqas]

Re: sd card doubt

@MOD[bassa]: oh sorry 4 that

 

[engr.waqas]

Re: sd card doubt

Disable antivirus.
have you provided a resistive voltage divider between controller and SD card???
most MCUs work on 5 v while sd card work on 3.3 v so you need a voltage divider.

 

[harish.n.j]

Re: sd card doubt

ya i have added resistence to drop the voltage.. i have uploaded the proteus model below

 

[engr.waqas]

Re: sd card doubt

you will be surprised to see my answer
dont use resistive network in proteus but always use it in actual hardware.
Attach MCU and sd card directly in proteus

 

[harish.n.j]

Re: sd card doubt

i removed the resistence . but still the same response is there any mistake in SPI initialisation

 

[engr.waqas]

Re: sd card doubt

I think u r checking if initialized properly by displaying "u" on usart terminal.Have u set usart terminal to 19200 in proteus too?? if not right click on it and set it
I recommend to use slowest baud rate for testing like 600(in both, coding and in proteus)

Added after 9 minutes:

Another important point ,u should use same clock rate in mikroC and in proteus.In proteus right click the processor and set its clock speed,proteus do not simulate external crystal attached to processor.

 

[harish.n.j]

Re: sd card doubt

ya i get the reply from the terminal. as "UWi". what may be wrong

 

[engr.waqas]

Re: sd card doubt

did your problem solved?

 

[harish.n.j]

Re: sd card doubt

no, actually my problem is with SD card initialization. i never had pblm with serial communication.
as per the program if the reply is "Ui" or "i" then the it means SD card is initialized but the reply i get is "UWi", which means Init() function does not return 0, which means initialization is not done correctly

what might be causing this problem

 

[engr.waqas]

Re: sd card doubt

this is because you are only checking if card is initialized,if not you go forward.
try this
while(mmc_fat_init(&PORTC,2)) ;
The program counter will stay here untill initialized

 

[harish.n.j]

Re: sd card doubt

Hey waqas thanks for your gr8 support, actually i tried as u said with the while loop but it was repeatedly printing WWWWWWWWW continuously, anyhow i solved the problem by modifying the example project file as per my code. it worked !. thanks a lot man u had provided me a good start !