Picbasic MMC SD : sdfs3.bas

[mackrackit]

Try changing this line to not use the hardware.

SDC_UseHardSPI = TRUE	' Use hardware SSP port for SPI.

I think you have the PIC pins mixed up.

And I think you will have better luck if you run the PIC from a 4MHz clock. Then you can run the whole thing from 3 volts and not have to worry with the resistors.

Do you have the SD pins 8 and 9 pulled up to 3 volts? That is also needed.

[iw2fvo]

Thanks a lot for the instructions:
I will put:
*SDC_UseHardSPI = False
*a new 4 Mhz xtal
* possibly a 3v3 power supply
Yes, pins 9 and 9 have a pull up of 10K to 3v3.
I will let you know the resultsby tomorrow evening .
Thanks again
Ambrogio

Try changing this line to not use the hardware.

SDC_UseHardSPI = TRUE	' Use hardware SSP port for SPI.

I think you have the PIC pins mixed up.

And I think you will have better luck if you run the PIC from a 4MHz clock. Then you can run the whole thing from 3 volts and not have to worry with the resistors.

Do you have the SD pins 8 and 9 pulled up to 3 volts? That is also needed.

[iw2fvo]

Hi,

I did all the changes... no improvement at all.
The pic has to be programmed at 5Vdc. I then changed the power supply voltage to 3v3. No change.

Thanks
Ambrogio
North Italy

Try changing this line to not use the hardware.

SDC_UseHardSPI = TRUE	' Use hardware SSP port for SPI.

I think you have the PIC pins mixed up.

And I think you will have better luck if you run the PIC from a 4MHz clock. Then you can run the whole thing from 3 volts and not have to worry with the resistors.

Do you have the SD pins 8 and 9 pulled up to 3 volts? That is also needed.

[mackrackit]

What errors are returned?
For example, what do you receive here?

Gosub FSInit
	Serout2 PORTC.6, 16780, ["Init: ", Dec FAT_error, " ", Dec SDC_status, " ", Dec SDC_response, $d, $a]

[iw2fvo]

Hi,
I receive :
" init: 6 2 0 "
" init: 6 2 3 "
" init: 8 6 0 "

and others ... at random.

Thanks
Ambrogio

What errors are returned?
For example, what do you receive here?

Gosub FSInit
	Serout2 PORTC.6, 16780, ["Init: ", Dec FAT_error, " ", Dec SDC_status, " ", Dec SDC_response, $d, $a]

[mackrackit]

I am away from the shop but I think the feed back is telling you the card is not present.

I am sure you have, but double check the hardware.
Are you using a socket for the SD card or some other way. I was using a two row header at first myself and had the problem of getting a good connection at times. Make sur you have the pins aliased correctly, another mistake I have made.

Do you have a schematic or a good picture of the hardware?

[iw2fvo]

Hi,
I am using a Futurlec mini_board as a card receptacle. The card present LED on the board is on.
The WP and CD disretes at the PIC input are at low level.
I will check the hardware again just to be sure 100%. I will come back again to you as soon as I do have check it.
Thanks again for the interest on my project.
Bye
Ambrogio

I am away from the shop but I think the feed back is telling you the card is not present.

I am sure you have, but double check the hardware.
Are you using a socket for the SD card or some other way. I was using a two row header at first myself and had the problem of getting a good connection at times. Make sur you have the pins aliased correctly, another mistake I have made.

Do you have a schematic or a good picture of the hardware?

[mackrackit]

Card present is just a switch. I do not use that myself. You could put anything in the socket and make the LED light.

It is used with SDFS if you want to detect a card and force the code to re-initialize for a new card with out a power cycle, "hot swap".

At this time do not use it. Just more stuff to debug.

If you have an 18F4550, or equivalent, to connect like the example might also be a good place to start.