JTAG
JTAG interface is designed for on-chip debugging, which means it can program and debug chips that do not have a bootloader. There are multiple Paparazzi-compatible devices available that support JTAG.
FLOSS JTAG
The FLOSS JTAG is based on an FTDI chip that allows two simultaneous USB connections, which means that FLOSS JTAG allows JTAG and UART/COM connections.
Let's take a look at upper side of the board. It contains JTAG connector (which is connected on photo) and two sets of RX/TX LEDs for JTAG and UART/COM interface separately. The JTAG connector is 2x5 pins, 0.05-inch pitch, and is compatible with the Samtec FFSD-05-D-06.00-01-N-RW-R ribbon cable.
On the other side of the board there is 4 pin UART/COM connector, which contains: Ground (black), TX (yellow), RX (orange) and +5V (red)
Usage of board is pretty simple: JTAG can be used to upload firmware into the board and/or repair board with broken bootloader, and UART/COM interfaced can be used to make "COM port style" connection to the board. COM connection can be used for example for telemetry debug.
Black Magic Probe
Info about [1]
FT2232 Dev Board
use ftdi prog to change the Description String into: FLOSS-JTAG
Related articles
- DevGuide/JTAG-Debug - Developer's guide JTAG debugging
- Dev/Debugging - General debugging information
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