Lisa

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

TODO

• 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 openhardwarewiki.org)
  • Routing rules that have to be followed
  • Add specification of external pressure sensor ADC
  • bummer Piotr, you're too fast (I am sorry ^^ Esden)

• 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

Hardware

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

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)

Software

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