The hardware for the CSPFL is designed to allow developers freedom in choosing how users interact with their applications. It was developed specifically with education in mind. The device is so flexible that every aspect of computer science can be explored using any number of approaches. One developer may be interested in applications for portable devices while another can explore desktop style applications or even drivers and microcontrollers.
Specifications and Features
- Texas Instruments OMAP3530 applications processor
- 128 Mbyte DDR-SDRAM (266 MHz)
- 256 Mbyte NAND flash memory
- 3.5" QVGA (320:240) 24bit Color LCD
- Resistive touchscreen
- DVI out at HD resolution (1024:768)
- Texas Instruments TLV320AIC33 stereo audio codec
- 24bit resolution
- 96 kHz sampling rate
- 3D/Bass/Treble/EQ/De-emphasis Effects
- IEEE 802.15.4 wireless with IP over 802.15.4 support
- 3 axis accelerometer
- 5-way rocker switch (up, down, left, right, and center)
- 6 general purpose buttons
- A Speaker
- Built-in 1300mAh Polymer Li-ion battery
Connectors & Ports
- 3.5mm stereo headphone port
- HDMI (not fully complaint, just as a small DVI port)
- Secure Digital card slot
- 2 USB full speed host ports (USB-A)
- Power jack
|1||Texas Instruments OMAP3530 applications processor|
|2||256 Mbyte NAND flash memory|
|3||128 Mbyte DDR-SDRAM (266 MHz)|
|4||Secure Digital card slot||Unfortunately card not included|
|5||Texas Instruments TFP410 DVI Transmitter|
|6||DVI-D single link output||In the form of an HDMI connector for size|
|8||Texas Instruments TLV320AIC33 stereo audio codec|
|9||3.5mm stereo audio jack|
|10, 11||Texas Instruments TUSB1106 USB Transciever|
|12||Texas Instruments TUSB2046B 4 port full speed USB hub|
|13, 14||USB Type A host receptacle|
|15||USB Mini-B device receptacle||Currently can only be used to charge, future releases will actually support USB device|
|16||Texas Instruments BQ24032A battery charge manager|
|17||DC power input||Fits 2.1mm ID, 5.5mm OD connectors|
|18||System power switch|
|19||Texas Instruments TPS65023 system power management||Provides power for the OMAP, NAND, and DDR-SDRAM|
|20||Texas Instruments BQ27500-V100 battery fuel gauge|
|21||Polymer Li-ion battery|
|22||Real-time clock with alarm|
|23, 24||Expansion connector|
|25||Boot order select button|
A few parts are occluded by the battery. They include the main 3.3V power supply, the 5V power supply and the LCD back light supply.
|1||Texas Instruments cc2431 wireless system|
|2||Atmel ATmega48 microcontroller||reads the accelerometer and sends data to the CY8C24794|
|3||Board to board connector||This connects to the back of the core board so it can talk to the system|
|4||Freescale MMA7340L Accelerometer|
|5||4 wire touchscreen connector|
|6||Texas Instruments TSC2046 4 Wire resistive touchscreen controller|
|7||Cypress CY8C24794 PSoC Device|
|8||Cypress programming interface|
|9||ATmega48 programming interface|
|10||CC2431 programming interface|
The full schematics can be found in the source tree. The schematics are provided as PDFs, PADS Logic binary, and PADS Logic 2005 ASCII. If there is any ambiguity or inadequate documentation, please make a ticket detailing the problem so we can improve it.
Schematics can be found at source:trunk/hardware/OSWALD_CORE.0/Schematic
Schematics can be found at source:trunk/hardware/OSWALD_CORE.1/Schematic
INTERFACE.0 & INTERFACE.1
Schematics can be found here source:trunk/hardware/OSWALD_INTERFACE/Schematic
The power switch provides the usual functions (system power on and off) but with a few differences. When switched on, the system power immediately switches on (as one might expect). Once the system is powered and the switch is moved to the "off" position, it flags the OMAP processor with an interrupt to request Linux to shutdown (or whatever you would like it to do) and about 10 seconds later actually cuts power from the system. This was implemented so that systems lacking any software to power-down the device - or is frozen - can be turned completely off.
Also implemented as part of the power switch (the circuitry just below the switch in the pictured above) is a lockout feature that prevents the system from starting if the battery is severely low on power (battery voltage of 2.7V or less). The lockout will disengage once the battery has been charged sufficiently (battery voltage 3.2V or more).
Boot Order Selection
The OMAP processor follows a predefined list of devices to check for the boot loader software (called X-Loader). It starts by checking the first few bytes in the NAND flash to determine if a valid boot loader exists there. If it does not (i.e. the NAND has been erased) then it will move on to checking the MMC/SD card (if one is inserted). This process is analogous to selecting boot order in a normal computer's BIOS (e.g setting the PC to boot from the hard drive first then the CD-ROM).
There are (and will be) times when the first few bytes of the NAND contain the correct information for the OMAP to think that there is a valid boot program but the program is actually broken. This can happen when trying new boot programs that don't work or for some reason the NAND become partally erased. When this happens the OMAP will begin running the broken program and never make it to the MMC/SD card thus turning your system into a brick. Fortunately there is a small button (#25 above) that when pressed, will reverse the device boot order (i.e. it will start at the MMC/SD then try the NAND). This allows a simple method to recover the system by using a normal flasher SD.
- first_prototype.JPG (337.6 kB) -
The first prototyped CORE system, added by kemperke on 10/22/08 23:41:41.
- holding_proto.jpg (79.5 kB) - added by kemperke on 11/24/08 19:32:11.
- sample-schematic-OMAP.png (35.8 kB) - added by kemperke on 11/29/08 17:01:38.
- sample-schematic-power.png (33.0 kB) - added by kemperke on 11/29/08 17:02:00.
- sample-schematic-memory.png (17.9 kB) - added by kemperke on 11/29/08 17:04:24.
- sample-schematic-usbinterface.png (26.2 kB) - added by kemperke on 11/29/08 17:06:31.
- sample-schematic-audiovideo.png (23.5 kB) - added by kemperke on 11/29/08 17:07:47.
- interfaceboard.jpg (70.1 kB) -
Interface Board, added by goskab on 08/03/09 10:58:45.
- oswald_front.jpg (41.6 kB) - added by goskab on 09/16/09 16:50:00.