Difference between revisions of "Didj"

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(Development Scripts and Programs)
(Technical Information)
Line 58: Line 58:
  
 
== Technical Information ==
 
== Technical Information ==
=== Details ===
 
 
* [[Didj_Mem_Map|Initial Memory Map Dump]]
 
* [[Didj_Mem_Map|Initial Memory Map Dump]]
 
* [[Didj_GPIO_Map|Map of Didj GPIO Pins]]
 
* [[Didj_GPIO_Map|Map of Didj GPIO Pins]]
  
=== File System Info ===
+
 
 +
''' File System Info '''
 
* rootfs / rootfs rw  
 
* rootfs / rootfs rw  
 
* /dev/root / jffs2 ro
 
* /dev/root / jffs2 ro
Line 80: Line 80:
  
  
if at boot you see:
+
''' Active Kernel/Rootfs
 +
 
 +
Near the begging of the boot message you should see one of two root options:
 
  root=31:04  
 
  root=31:04  
you are using  mtd4: 00e00000 00020000 "Linux_RFS0"
+
You are using  mtd4: 00e00000 00020000 "Linux_RFS0" or
 
  root=31:06  
 
  root=31:06  
you are using  mtd6: 00e00000 00020000 "Linux_RFS1"
+
You are using  mtd6: 00e00000 00020000 "Linux_RFS1"
  
  
=== Batteries and Recharging Station ===
 
 
''' Battery Compartments '''
 
''' Battery Compartments '''
  
Line 96: Line 97:
 
** Term 3 - Temp Sensor -
 
** Term 3 - Temp Sensor -
 
** Term 4 - Battery -
 
** Term 4 - Battery -
 +
  
 
''' Rechargeable Batteries '''
 
''' Rechargeable Batteries '''
Line 101: Line 103:
 
In addition to the terminals facing the Didj's contacts, there are another set of contacts facing away from the Didj.
 
In addition to the terminals facing the Didj's contacts, there are another set of contacts facing away from the Didj.
 
These contacts are duplicates used by the charging station.  The batteries themselves are NIMH cells, producing around 2.5v per pack when fully charged.
 
These contacts are duplicates used by the charging station.  The batteries themselves are NIMH cells, producing around 2.5v per pack when fully charged.
 +
  
 
''' Recharging Station '''
 
''' Recharging Station '''
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=== SSP / SPI Controller ===
+
''' SSP / SPI Controller '''
 
[[Didj SPI Info]]
 
[[Didj SPI Info]]
  

Revision as of 21:51, 23 July 2011

We are currently in the process of upgraded and organizing these pages, please forgive the mess, thank you.

The LeapFrog Didj

Summary

The Didj was a toy produced by Leapfrog marketed for educational games for children aged 5-10.

Didj was end-of-lifed by Leapfrog in mid-2010. It has been replaced by the Leapster Explorer.

Although Didj has a proprietary graphical front end, it runs a generic Linux distribution on an Arm based processor. Soon after the Didj's release, it was discovered that the cartridge port contained pins that allowed for serial console access with root privileges. After this discovery, work began to modify the Didj into an accessible emulation device.

Since development began, much has been accomplished, including:

  • Discovered that the Arm chip is the same as on the GP2X Wiz, only at a lower clock speed.
  • Created cartridges that support SD cards
  • Accessed the UART features in the cartridge slot


Platform

LeapFrog Pollux Platform

The Didj is part of 3 different devices that all share a common hardware platform, based around the Pollux SoC. The platform page contains information generic across these devices, and it is recommended that you refer to that page as it is a good starting point to understanding the Didj, and contains some basic How To's and Tutorials to get you started.

Boot Loader

Tutorials/How To's

General

Networking

USB Storage

Cartridge

Flash NAND

Firmware Image

Brio Development

Development Scripts and Programs

Technical Information


File System Info

  • rootfs / rootfs rw
  • /dev/root / jffs2 ro
  • none /proc proc rw
  • sysfs /sys sysfs rw
  • /dev/ram0 /tmp tmpfs rw
  • /dev/mtdblock1 /flags jffs2 rw,sync,noatime
  • /dev/mtdblock2 /mfgdata jffs2 ro,sync,noatime
  • /dev/mtdblock10 /Didj vfat rw,noatime,fmask=0022,dmask=0022,codepage=cp437,iocha rset=iso8859-1
  • /dev/mtdblock11 /Cart vfat ro,noatime,fmask=0022,dmask=0022,codepage=cp437,iocha rset=iso8859-1
Filesystem                Size       Mounted on
/dev/mtdblock6           14.0M     /
/dev/mtdblock1          896.0k    /flags
/dev/mtdblock2            1.0M    /mfgdata
/dev/mtdblock9          215.8M    /Didj


Active Kernel/Rootfs

Near the begging of the boot message you should see one of two root options:

root=31:04 

You are using mtd4: 00e00000 00020000 "Linux_RFS0" or

root=31:06 

You are using mtd6: 00e00000 00020000 "Linux_RFS1"


Battery Compartments

The Didj has two identical battery compartments, the combined collection of batteries are wired in series.

  • Battery Compartment Terminals:
    • Term 1 - Battery +
    • Term 2 - Temp Sensor + Wired to Pollux pins K20 / GPIOA 28 and K21 / GPIOA 29
    • Term 3 - Temp Sensor -
    • Term 4 - Battery -


Rechargeable Batteries

In addition to the terminals facing the Didj's contacts, there are another set of contacts facing away from the Didj. These contacts are duplicates used by the charging station. The batteries themselves are NIMH cells, producing around 2.5v per pack when fully charged.


Recharging Station

The recharger station contains a battery charge circuit with temperature monitoring. The station also has a pair of contacts that duplicate the 9V dc barrel jack.


SSP / SPI Controller Didj SPI Info

Images

External Links