Lisa/L

Lisa/L is a dual processor board autopilot designed to allow the possibility of using Linux for Paparazzi airborne code or advanced payload and path plannning. AN OMAP-based Gumstix Overo computer can be mounted directly to Lisa/L, with access to USB, SPI, and serial. The onboard STM32 microcontroller communicates with the Overo using a fast SPI interface. It can be used for both fixedwing and rotorcraft airframes. For links to additional documentation, please see Lisa Overview page here.

Hardware Revision History

Version #	Release Date	Release Notes
v1.1	???	Next release of Lisa/L
v1.0	???	Initial release of Lisa/L

For differences between versions, please see below.

Lisa/L is based on the 64-pin STM32F103RE processor featuring 64k of RAM and 512k of FLASH, which is part of the high-density performance line family.

Features:

STM32 microcontroller (CortexM3@72Mhz) STM32F103RE datasheet
Numerous reconfigurable analog input channels 0V - 3.3V (2 channels with optional on-board resistor bridge)
3x 3.3V TTL UART (5V tolerant)
1x CAN
6x PWM outputs
1x R/C receiver PPM frame input (trig pin on UART1 connector)
2x SPI bus
2x I²C bus
1x USB (client) connected to STM32 JTAG and Overo serial console
2x switching power supply (3.3V and 5V)
6.5V linear regulator for ADC
8x status LEDs with attached test point
1x absolute pressure sensor (for altitude)
1x differential pressure sensor (for airspeed)
Integrated JTAG debug for STM32
1x Gumstix Overo Mount
1x IMU mount
30 grams (1.1 oz), not including Aspirin IMU or Gumstix Overo COM
50mm x 90mm (2in x 3.6in)
4 layer PCB design

The Lisa/L is designed to have a Gumstix Overo mounted onboard. In addition there is an onboard location to mount an IMU. Specifically, the Booz IMU or the Aspirin IMU can be easily mounted and interfaced. There is also a low-profile mount available for the Aspirin IMU.

Lisa/L simplified block diagram
Lisa/L v1.0 top view
Lisa/L v1.0 bottom view

Pinout

Pins Name and Type are specified with respect to the Autopilot Board.

Lisa/L V1.1

NOTE: The silkscreen on the PCB says that the 8th pin of the ADC/Spare header is PB2. This is incorrect, pin 8 is PD2.

Lisa-L 0.99 LED order:

 green: 3,  5,  7,  1
 red:   2,  4,  6,  0

NEED PINOUT TABLES HERE!!!

Powering the Board

The board accepts input voltage from 6V to 18V. The power connector is from JST and known in the rc world as a BEC connector.

Schematic

Also see the Downloads section.

Lisa/L v1.0

LisaL V1.0 Schematic Sheets 1 .. 6

LisaL V1.0 Schematic Sheet 1/6
LisaL V1.0 Schematic Sheet 2/6
LisaL V1.0 Schematic Sheet 3/6
LisaL V1.0 Schematic Sheet 4/6
LisaL V1.0 Schematic Sheet 5/6
LisaL V1.0 Schematic Sheet 6/6

Lisa/L v1.1

LisaL V1.1 Schematic Sheets 1 .. 6

LisaL V1.1 Schematic Sheet 1/6
LisaL V1.1 Schematic Sheet 2/6
LisaL V1.1 Schematic Sheet 3/6
LisaL V1.1 Schematic Sheet 4/6
LisaL V1.1 Schematic Sheet 5/6
LisaL V1.1 Schematic Sheet 6/6

LisaL V1.1 place Ppans front and back

LisaL V1.1 Placeplan Front
LisaL V1.1 Placeplan Back

Examples of Airborne Equipment Electrical Connections

Need some examples here, see Lisa/M_v20#Examples_of_Airborne_Equipment_Electrical_Connections or Umarim_v10#Examples_of_Airborne_Equipment_Electrical_Connections

R/C Receivers

Spektrum/JR remote receiver connection diagram

There is a Spektrum parser available, enabling the direct use of 1 or 2 Spektrum satellite receivers.

PPM Remote receiver

To use the PPM signal of a PPM remote receiver, the input pin for the signal is the Trig.pin 1 (on UART1 connector), it is hardcoded and can not be changed. Also make sure that a bridge(~0 Ohm) in the conductor path is soldered. See below picture for the right position.

PCB

Gerber & Drill Files

Download Lisa/L gerber & drill files (zip) NOT YET AVAILABLE BUT SEE Downloads Need some generated gerbers and drill files here.

Assembly

Components Layout

NOT YET AVAILABLE BUT SEE Downloads Need some top and bottom of board images and line drawings here.

Bill Of Material

Download Lisa/L Bill Of Material (zipped .xls file) NOT YET AVAILABLE BUT SEE Downloads

PCB and assembled boards suppliers

Available on Get Hardware page, hopefully :)

Mechanical Dimensions

Lisa/L's four mounting holes fit M3 screws or standoffs. Their centers are in a square 43.8mm on a side.

NEED LISA/L MECHANICAL DRAWING.

Downloads

Source files

download available on GitHub: Cadsoft Eagle 6 Design

Gerber & Drill files

download NOT YET AVAILABLE Need generated gerbers and drill files

Assembly files

download NOT YET AVAILABLE Need Lisa/L Components layouts (pdf)
download NOT YET AVAILABLE Need Lisa/L Bill Of Material

JTAG

JTAG can be used to upload firmware through the onboard JTAG interface. It can also be used for debugging. It appears as the second USB device of Lisa/L, so if you don't have anything else connected as /dev/ttyUSB1

JTAG description;
General debugging information;
JTAG usage, includes Eclipse uplink tutorial.

Serial Firmware Upload

Firmware upload using the factory integrated bootloader can be useful e.g. if you have overwritten Luftboot accidentally and don´t have access to JTAG.

Now a boot sequence works as follows:

BOOT0 has to be set to 3.3V by use of a jumper cable
Connect a 3,3V serial cable (FTDI, MAX232...) to UART1.
Power the board and activate the bootloader program

The according bootloader script can be found at : stm32loader from Github

git clone https://github.com/jsnyder/stm32loader.git

To reload Luftboot, upload luftboot.bin

Serial upload can also be used directly from paparazzi Center by adapting the right path in Makefile.stm32 for the LOADER argument and setting

eq: LOADER=/home/poine/work/stm32/stm32loader-a3c51c26ad6c/stm32loader.py to LOADER=/home/microuav/stm32loader/stm32loader.py

Detailed Hardware Revision History

NEED DETAILS BETWEEN VERSIONS HERE!!!

Lisa/L

Contents

Hardware Revision History