On this page there are a few infos on the different boards
brotkasten-1 consists of a number of boards. Some of which are already ready and some are in development. Each board adds some unique features to the system. The different boards may include own CPUs or controllers of some kind, making it a multi-CPU system.
The Mainboard hosts the central glue logic
The mainboard currently houses the main CPU (ATMega 1284 at this point), two RS-232 interfaces, main TWI bus, a set of status LEDs, and a socket for extra storage.
| Name | Connector | Power | Info |
|---|---|---|---|
| SPI/ISP | 10-pin shrouded header | in | Mostly used for flashing the OS |
| com1 | 6-pin shrouded header | out | TTL level, hardly used |
| com2 | 6-pin shrouded header | out | RS-232, main console |
| twi1 | 6-pin shrouded header | out | Main TWI bus |
| Power in USB | USB B | in | Only used as easy power input port |
| Main power | 3-pin screw terminal | inout | Main power connector |
| Misc headers | pin headers | out | There are a number of pin headers to access different parts during development |
Support for HID devices
The PS/2 interface board provides drivers for up to three PS/2 based HID devices. The board also supports decoding unicode from and encoding to several character sets (UTF-8, DEC MCS, Hitachi A00). This feature is used to provide consistent Unicode support to the host no matter the connected devices.
| Name | Connector | Power | Info |
|---|---|---|---|
| SPI/ISP | 10-pin shrouded header | in | Mostly used for flashing the OS |
| Display | 10-pin shrouded header | out | Can be used to connect a status LCD or 7-segment displays |
| Terminal | 6-pin shrouded header | out | RS-232, TWI (to slaves), used to chain more HID interfaces |
| Host | 6-pin shrouded header | in | RS-232, TWI (to master), connected to com2 on the main board |
| PS/2 Port 0 | 4-pin header | out | Standard PS/2 port |
| PS/2 Port 1 | 4-pin header | out | Standard PS/2 port |
| PS/2 Port 2 | USB A | out | PS/2 port with USB connector |
| Main power | 2-pin screw terminal | in | Main power connector |
| GND | 3-pin header | - | Reference ground used during development |
Boards in development
A number of additional boards is currently in development. Those boards will add more and more features over time. The following is a list of features that are currently in active development: