SD GPS Track Logger
Why? This is why:Bicycling Trips
Need a PIC18 chip with more memory, I'm using the PIC18F4685 with 96Kbytes of program memory.
Microchip Mass Storage Class Firmware
Still not working. Might be software or hardware, I'll need to check it on a digital oscilloscope.
Correct clock rate (less than 400KHz).
MDD File System V1.00 with PIC18F working? - Microchip forum post
Hardware
DM163025 PicDEM USB Demo Board
picdem_fs_usb_demonstration_board_users_guide.pdf
Will be useful for future projects, however the included processor, the PIC18F4550 does not have enough memory for the filesystem library from Microchip.
AC164122 PICtail Board for SD & MMC
SD and MMC Cards PICtail Daughter Board Info Sheet
| Function | I/O | Pin | Description |
|---|---|---|---|
| SCK | O | RB1 | SPI Clock Out |
| SDI | I | RB0 | SPI Data In |
| SDO | O | RC7 | SPI Data Out |
| CD | I | RB4 | Physical Card Insertion Detect Signal |
| WD | I | RA4 | Physical Write-Protect Switch Status Signal |
| CS | O | RB3 | Low Asserting SPI Chip Select |
Activity LED is tied to Chip Select line.
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Datasheets
Reference
- Filesystem IC uALFAT3, $14
Notes:
http://home.teleport.com/~brainy/fat16.htm
http://www.lvr.com/access_flash_drives_with_a_microcontroller.htm
USB Mass Storage book from Amazon
http://forum.microchip.com/tm.aspx?m=220591
http://forum.microchip.com/printable.aspx?m=237453
Other projects online
- GPS to SD-Card Data Logger - Does not use the FAT filesystem