Hi everyone
I have a micro-SD adapter working in SPI mode. Is there a driver for this, or should I forget it and buy proper SD adapters? I want to use it to store small audio-files.
In this thread viewtopic.php?f=13&t=1615&p=9443&hilit= ... mosi#p9443 Panu mentioned that you can do this with SPI driver and SD-SPI driver, but I can't see these drivers anywhere.
Is this worth doing?
SD card in SPI mode
Re: SD card in SPI mode
Hi!
The SDSPI driver was built into the kernel until about version 2.50. I'm not sure if I've ever made it into a loadable DL3 file, but it shouldn't be much more than extracting the devHwSpi.c and devSdSpi.c files from the old kernel and tinkering around a bit. I'll look into it, it's a useful feature. I've used it on several occasions and also together with the devSwSpi.c driver, which allows any GPIO pins to be used as a software (bit-bang) SPI bus. As an example, I soldered a microSD adaptor into the JTAG header one customer brought out on his board so that I was able to easily load and run custom programs on his board from a MicroSD...
-Panu
The SDSPI driver was built into the kernel until about version 2.50. I'm not sure if I've ever made it into a loadable DL3 file, but it shouldn't be much more than extracting the devHwSpi.c and devSdSpi.c files from the old kernel and tinkering around a bit. I'll look into it, it's a useful feature. I've used it on several occasions and also together with the devSwSpi.c driver, which allows any GPIO pins to be used as a software (bit-bang) SPI bus. As an example, I soldered a microSD adaptor into the JTAG header one customer brought out on his board so that I was able to easily load and run custom programs on his board from a MicroSD...
-Panu
Info: Line In and Line Out, VS1000 User interface, Overlay howto, Latest VSIDE, MCU Howto, Youtube
Panu-Kristian Poiksalo, VLSI Solution Oy
Panu-Kristian Poiksalo, VLSI Solution Oy
Re: SD card in SPI mode
Thank you, Panu, I understand.
On the other hand, I've just read about SD cards, and it seems to me that I was mistaken. Even though my module is marked with SPI pin names, it should still work in (1-bit) SD mode.
So, according to SD and VS1005 schematics,
- MISO is the same pin as DAT0 (and goes to GPOI2_6)
- MOSI is the same as CMD (goes to GPIO2_10)
- SCLK is CLK (goes to GPIO2_5)
- CS is DAT3 (GPIO2_9)
- VCC to AVDD, GND to GND
- I have to load SDSD driver with '1' option
- that's it.
Sorry if this all sounds obvious, but it is not obvious for me...and perhaps for someone else like me.
On the other hand, I've just read about SD cards, and it seems to me that I was mistaken. Even though my module is marked with SPI pin names, it should still work in (1-bit) SD mode.
So, according to SD and VS1005 schematics,
- MISO is the same pin as DAT0 (and goes to GPOI2_6)
- MOSI is the same as CMD (goes to GPIO2_10)
- SCLK is CLK (goes to GPIO2_5)
- CS is DAT3 (GPIO2_9)
- VCC to AVDD, GND to GND
- I have to load SDSD driver with '1' option
- that's it.
Sorry if this all sounds obvious, but it is not obvious for me...and perhaps for someone else like me.
Re: SD card in SPI mode
However, this does not seem to be working. Driver reports "SD Card not found".
As far as I understand, SD card itself when inserted should be pulling up its CS/DAT3 leg. On my SD module it does not. I guess that after all this module can only be used in SPI mode. It's "SPI micro SD storage module for Arduino" and I guess it has some SPI-specific or Arduino-specific electronics.
As far as I understand, SD card itself when inserted should be pulling up its CS/DAT3 leg. On my SD module it does not. I guess that after all this module can only be used in SPI mode. It's "SPI micro SD storage module for Arduino" and I guess it has some SPI-specific or Arduino-specific electronics.