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Lisa ( the Lost Illusions Serendipitous Autopilot) is a STM32/Overo board designed to run Paparazzi


  • Generic
    • JTAG on STM32: ok
    • I2C on STM32:
    • SPI on STM32:
    • Pressure sensors:
    • USB for gumstix : does 5V need to be switchable ? (to allow reset from the gumstix)
    • Make sure STM32 can interrupt overo

B O O Z . L B R ---- edited by gany, who doesn't yet have rights to commit to that folder, so please don't change library file as long as this text is here!!!

  • Antoine:
    • Take todo's from above associate to names
    • Todo's from sheet 3
    • Check's from sheet 5
    • Pressure sensor instruction to gany (redo airspeed computation), so he can finish the schematic for that (or finish it directly in the schematic)
    • work with piotr on connecting the missing wires on the STM
    • Check the routing rules below and add if planned on routing a certain part in a specific way
    • Give Gany commit rights to the lbr folder (booz.lbr) and the lisa folder
  • Esden:
    • STM32 spelling and connection check
    • Fix STM32 footprint pad sizes
    • howto for STM32 gcc gdb toolchain (blinking LED or similar) (started writing one on
    • Routing rules that have to be followed
    • bummer Piotr, you're too fast (I am sorry ^^)
  • Gany:
    • Check FT2232 footprint hw/lbr/booz.lbr qfn-64 size & pinout
      • -> Changed pad size from 0.6 x 0.4 to 0.75 x 0.25 and moved pin1 indicator outside the chip.
    • Place components
    • Route board
    • Send for production 4pcb/pcbcard(china)/sunstone


The hardware is still in development. The current CAD files are maintained in savannah svn in the paparazzi4/trunk/hw/lisa directory. Software development is done on a Overo/Summit + Olimex STM32-H103 dev board

Lisa proto.jpg

Pressure sensor ADC requirements

Because of high resolution requirements in the pressure sensor circuit there is an external ADC needed with the following features:

  • 16bit resolution minimum, 20bit would be awesome
  • Two channels (multiplexed or not) each at least 100Hz sampling rate
  • I2C or SPI interface (I2C preferred)


STM32 toolchain

You can use the summon-arm-toolchain script to build the required toolchain. For the default values of the Paparazzi Makefile to work, you should set

PREFIX=/opt/stm32/toolchain/arm-elf and LIBSTM32_EN=1

Open Embedded

Open Embedded is the linux distribution used on the overo. You can follow the instructions on gumstix's website to build a complete cross development environment. Paparazzi's Makefile will default to look for it in /overo-oe


Routing Rules

  • 6mil traces/spacings for signals
  • 12mil traces/spacings for power traces (this is min value, otherwise as wide as possible or even planes if possible)
  • 6mil layout grid
  • Layer stacking:
    • Top: Signal + Ground plane
    • Route2: Ground plane(s) (Separate analogue and digital ground)
    • Route15: Power plane(s)
    • Bottom: Signal + Ground plane
  • 0.4mm vias with 0.1mm restring