|  | This is a small demonstration unit for the STM32 series of ARM 
        microcontrollers. | Low, ~$50, pricetag that includes several components: | STM32F103B MCU with 128-KB flash program memory and 
        20-KB SRAM |  | 128x128 LCD display |  | 2 mini USB ports (one strictly for debugging) |  | 3D MEMS accelerometer     |  | 3 LEDS (one for debugging) |  | buzzer |  | optional IRDA transceiver (you need to buy and solder it in 
        yourself) |  | pushbutton switch  |  | rechargeable battery (recharges via USB)    
           |  |  |  | IDE supplied by Raisonance 
        they also develop the RLink debugging hardware/software | They also make the CircleOS menu program for the device.  With 
        it, several small programs can be stored on the device and selected 
        between. |  | IDE seems to be a frontend for the GCC compiler.  Debugging is 
        limited to small programs. |  | GCC could probably be used from command line to compile also.  |  |  | One serious problem is getting the RLink device driver installed and 
        working | RLink enables single-step debugging with the actual device via USB |  | RLink currently does not work at all with Vista x64.  A new 
        driver was provided to allow usage with Vista x32. |  | I could not get RLink to work with one laptop running Windows XP.  
        I think the problem may be with the Sentinel security system that 
        pre-installed software uses and Raisonance also uses to protect their 
        software. |  |  |  |  | Complete schematics and parts list is posted on the
        STM32 
        Circle Files Page   |