Tawaki/v1.00
Hardware Revision History
Version # | Release Date | Release Notes |
---|---|---|
v1.00 | 07/2019 | Initial release of Tawaki |
Overview
Pictures
Key Features
- STMicro STM32F777VI Micro Controller Unit
- ARM Cortex-M7, 216 MHz CPU, FPU & DSP instructions, 2 Mbytes Flash, 512 Kbytes SRAM, General-purpose DMA, HW Crypto,etc.
- On-board Sensors
- 8x Servos or ESC outputs (PWM/OneShot/DShot) + D-Shot Telemetry serial input
- 2x RC Receiver Inputs (S.BUS, PPM & Spektrum Satellite compatible, including receiver binding)
- Communication Buses
- 3x UARTs (including one with hardware flow control signals)
- 1x I2C bus (3.3V and 5V logic level)
- 1x SPI bus (with Slave Select, Master or Slave)
- 1x CAN bus
- 1x USB (Micro-B & remote) : DFU mode (download) or USB storage (direct access to MicroSD card) or FullSpeed Mode
- 8x Auxiliary Inputs/Outputs spread over 2 connectors (8x ADC, 8x Timers different from servos, x1 UART, etc.)
- MicroSD card (+ dedicated power supply for emergency files closing system)
- Debug Connector (Serial Wire Debug)
- Power
- source 2 to 4 Lipo cells (6 to 17v)
- 5V/4A (max total for Tawaki + Servos + Payload)
- 3.3V/3A Low Noise (max total for payload)
- Controlled PowerSwitch 5V/2A supply on AUX A connector
- x4 Status Leds
- Connectors fully compatible with Apogee autopilot
- Mechanical
- 53 x 25mm (2.1" x 0.98"), including 4x Φ2mm mounting holes (shares the same external dimensions and mounting points as Apogee)
- 4x Φ3mm extra mounting slotted holes, 30 to 31mm spacing (30.5mm standard from Racers ESC, GPS modules, etc. )
- 11g (0.4 oz) (including Micro-SD card)
Pinout
Simplified Pinout Diagram (Paparazzi use)
Pins Name and Type are specified with respect to the Autopilot Board
Simplified Pinout Tables (Paparazzi use)
Servos a1 / a2 / a3 / a4
Pin # | Name | Type | MCU Port | MCU Resource | Description |
---|---|---|---|---|---|
1 | GND | PWR | - | - | common ground |
2 | +5V | PWR | - | - | 5V Rail from autopilot |
3 | SRVa1 SRVa2 SRVa3 SRVa4 |
OUT | PE9 PE11 PE13 PE14 |
Tim1.Ch1 Tim1.Ch2 Tim1.Ch3 Tim1.Ch4 |
Servo signal (PWM) |
Servos b
Pin # | Name | Type | MCU Port | MCU Resource | Description |
---|---|---|---|---|---|
1 | GND | PWR | - | - | common ground |
2 | VBAT | PWRIN/OUT | - | - | Battery Rail (if solder bridge JP1 ON) |
3 | SRVb1 | OUT | PB6 | Tim4.Ch1 | Servo signal (PWM) |
4 | SRVb2 | OUT | PB7 | Tim4.Ch2 | Servo signal (PWM) |
5 | SRVb3 | OUT | PB8 | Tim4.Ch3 | Servo signal (PWM) |
6 | SRVb4 | OUT | PB9 | Tim4.Ch4 | Servo signal (PWM) |
7 | DSHTin | IN | PB5 | UART5.Rx | DShot Telemetry serial input |
R/C
Pin # | Name | Type | MCU Port | MCU Resource | Description |
---|---|---|---|---|---|
1 | GND | PWR | - | - | common ground |
2 | +5V | PWR | - | - | 5V Rail from autopilot |
3 | +3.3V | PWR | - | - | 3.3V Rail from autopilot |
4 | RC1 | IN | PE0 | UART8.Rx | (5V Tolerant) Serial (SBUS, Spektrum, etc.) |
5 | RC2 | IN | PC6 | UART6.Rx (Tx software swap) Tim3.Ch1 Tim8.Ch1 |
(5V Tolerant) Serial (SBUS, Spektrum, etc.) or PPM Stream RC receiver signal |
UART2
Pin # | Name | Type | MCU Port | Description |
---|---|---|---|---|
1 | GND | PWR | - | common ground |
2 | +5V | PWR | - | 5V Rail from autopilot |
3 | +3.3V | PWR | - | 3.3V Rail from autopilot |
4 | RX2 | IN | PD6 | UART2 Serial Input (3.3V level) |
5 | TX2 | OUT | PD5 | UART2 Serial Output (3.3V level) |
UART3
Pin # | Name | Type | MCU Port | Description |
---|---|---|---|---|
1 | GND | PWR | - | common ground |
2 | +5V | PWR | - | 5V Rail from autopilot |
3 | +3.3V | PWR | - | 3.3V Rail from autopilot |
4 | RX2 | IN | PD9 | UART3 Serial Input (3.3V level) |
5 | TX2 | OUT | PD8 | UART3 Serial Output (3.3V level) |
UART7
Pin # | Name | Type | MCU Port | Description |
---|---|---|---|---|
1 | GND | PWR | - | common ground |
2 | +5V | PWR | - | 5V Rail from autopilot |
3 | +3.3V | PWR | - | 3.3V Rail from autopilot |
4 | RX2 | IN | PB3 | UART7 Serial Input (3.3V level) |
5 | TX2 | OUT | PA15 | UART7 Serial Output (3.3V level) |
I2C2 (3V3)
Pin # | Name | Type | MCU Port | Description |
---|---|---|---|---|
1 | GND | PWR | - | common ground |
2 | +5V | PWR | - | 5V Rail from autopilot |
3 | +3.3V | PWR | - | 3.3V Rail from autopilot |
4 | SDA2 3.3V | Open Drain I/O | PB11 | I2C2 bus Serial DAta (3.3V level, 2.2kΩ pull-up) |
5 | SCL2 3.3V | Open Drain I/O | PB10 | I2C12 bus Serial CLock (3.3V level, 2.2kΩ pull-up) |
I2C2 (5V)
Pin # | Name | Type | MCU Port | Description |
---|---|---|---|---|
1 | GND | PWR | - | common ground |
2 | +5V | PWR | - | 5V Rail from autopilot |
3 | +3.3V | PWR | - | 3.3V Rail from autopilot |
4 | SDA2 5V | Open Drain I/O | PB11 | I2C2 bus Serial DAta (5V level, 2.2kΩ pull-up) |
5 | SCL2 5V | Open Drain I/O | PB10 | I2C12 bus Serial CLock (5V level, 2.2kΩ pull-up) |
SPI2
Pin # | Name | Type | MCU Port | Description |
---|---|---|---|---|
1 | GND | PWR | - | common ground |
2 | +5V | PWR | - | 5V Rail from autopilot |
3 | +3.3V | PWR | - | 3.3V Rail from autopilot |
4 | NSS2 | OUT | PB12 | Slave Select. Selects the SPI slave |
5 | MOSI2 | I/O | PB15 | SPI2 Master Out Slave In. Data output from master / data input to slave |
6 | MISO2 | I/O | PB14 | SPI2 Master In Slave Out. Data input to master / data output from slave |
7 | SCK2 | I/O | PD3 | SPI2 Serial clock. Clock output from master or input to slave |
CAN
Pin # | Name | Type | MCU Port | Description |
---|---|---|---|---|
1 | CANL | I/O | - | CAN bidirectional - line |
2 | CANH | I/O | - | CAN bidirectional + line |
Note: Embedded 120Ω terminator resistor.
AUX a
Pin # | Name | Type | MCU Port | MCU Resource | Description |
---|---|---|---|---|---|
1 | GND | PWR | - | - | common ground |
2 | +5V Aux | PWR | (Controlled by) PC13 | - | 5V from autopilot through Power Switch (PC13 = Low => OFF / PC13 = High => ON) |
3 | +3.3V | PWR | - | - | 3.3V Rail from autopilot |
4 | AUXa1 | I/O | PA0 | ADC1+2+3.In0 Tim2.Ch1 Tim5.Ch1 UART4.Tx UART2.CTS |
General Purpose I/O |
5 | AUXa2 | I/O | PA1 | ADC1+2+3.In1 Tim2.Ch2 Tim5.Ch2 UART4.Rx UART2.RTS |
General Purpose I/O |
6 | AUXa3 | I/O | PA2 | ADC1+2+3.In2 Tim2.Ch3 Tim5.Ch3 Tim9.Ch1 |
General Purpose I/O |
7 | AUXa4 | I/O | PA6 | ADC1+2.In6 Tim3.Ch1 Tim13.Ch1 |
General Purpose I/O |
AUX b
Pin # | Name | Type | MCU Port | MCU Resource | Description |
---|---|---|---|---|---|
1 | GND | PWR | - | - | common ground |
2 | +5V | PWR | - | - | 5V Rail from autopilot |
3 | +3.3V | PWR | - | - | 3.3V Rail from autopilot |
4 | AUXb1 | I/O | PA3 | ADC1+2+3.In3 Tim2.Ch4 Tim5.Ch4 Tim9.Ch2 |
General Purpose I/O |
5 | AUXb2 | I/O | PA7 | ADC1+2+3.In7 Tim3.Ch2 Tim14.Ch1 |
General Purpose I/O |
6 | AUXb3 | I/O | PB0 | ADC1+2.In8 Tim3.Ch3 |
General Purpose I/O |
7 | AUXb4 | I/O | PB1 | ADC1+2.In9 Tim3.Ch4 |
General Purpose I/O |
USB
Pin # | Name | Type | MCU Port | Description |
---|---|---|---|---|
1 | GND | PWR | - | common ground |
2 | USB+ | I/O | PA12 | USB bidirectional D+ line |
3 | USB- | I/O | PA11 | USB bidirectional D- line |
4 | VBUS | IN | PA9 | USB bus power (5V) |
5 | BOOT | IN | BOOT0 | DFU or USB Mode selection (BOOT0 MCU pin) |
Note: USB Micro-B and Molex Picoblade connectors are in parallel, only one should be connected at a time.
SWD
Pin # | Name | Type | MCU Port | Description |
---|---|---|---|---|
1 | GND | PWR | - | common ground |
2 | +3.3V | PWR | - | 3.3V Rail from autopilot |
3 | nRST | IN | NRST | MCU Reset (active low) |
4 | SWCLK | IN | PA14 | Serial Wire Clock |
5 | SWDIO | I/O | PA13 | Serial Wire Data Input/Output |
Detailed Features
Power Supply
Powering using battery/external source soldered on battery pads
Powering using battery/external source connected on "Servos b" header
Powering using USB Micro-B only ("Development Board" mode)
Powering using external 5V source
USB Modes
Flash (DFU) mode
In this configuration, BOOT pin is connected to VBUS pin (#4 & #5 "USB" header).
If USB cable is plugged and autopilot is not powered or USB cable plugged before autopilot is powered, board enter DFU mode and is ready to be flashed.
USB Storage mode
In this configuration, BOOT pin is connected to VBUS pin (#4 & #5 "USB" header).
If USB cable is plugged after autopilot is powered, autopilot task is stopped and board enters in USB storage mode to make SDcard content easily available by host as for an USB Pendrive. When unmounted and unplugged, autopilot task restart.
Full Speed USB mode
General Pinout
Pins Name and Type are specified with respect to the Autopilot Board
Schematic
Mechanical
Mechanical Dimensions
CAD Files / 3D Model
Download Tawaki v1.00 CAD File (zipped STEP file)
Example of Airborne Equipment Electrical Connections
Board production
Gerber & Drill for PCB
Bill Of Material
Components Layout
Bottom components layout (pdf)
Top components layout (pdf)
Pick-and-Place
Programming
Debugging
Debugging with STM Discovery ST-LINK/V2 embedded debug tool
Debugging with BlackMagic probe
Debugging with CricketProbe
Source code
Available in latest git master branch.
Where to Buy
Check availability on Get Hardware page