SD Cards
For a project I need to configure some FPGAs from an AVR. An SD card seemed a good place to store the configurations. This page give some information on how you can an AVR can be used to read files from a SD card.
SD Card Preparation
> fdisk /dev/sdc1 (System type code 6: FAT16) > dd if=/dev/zero of=/dev/sdc1 bs=512 count=1 > mkdosfs -v -F 16 /dev/sdc1
SD Card Connections
The figure below shows the underside of an SD card.
SD Card Connections
| Pin Number | Pin Name | Function |
|---|---|---|
| 1 | CS | Card Select (Requires pull-up) |
| 2 | DI | Data Input |
| 3 | VSS1 | Ground |
| 4 | VDD | Supply Voltage (3.3V) |
| 5 | SCLK | Clock |
| 6 | VSS2 | Ground |
| 7 | DO | Data output (Requires pull-up) |
| 8 | IRQ | Interrupt (Requires pull-up) |
| 9 | NC | Unused (Requires pull-up) |
AVR Circuit
Software
http://www.larwe.com/zws/products/dosfs/ http://hubbard.engr.scu.edu/avr/avrlib/index.html