PC-Hosted BMP
Compile in src with "make PROBE_HOST=hosted"
Description
PC-hosted BMP run on the PC and compiles as "blackmagic". When started, it either presents a list of available probes or starts the BMP process if either only one probe is attached to the PC or enough information is given on the command line to select one of several probes.
When started without any other argument beside the probe selection, a GDB server is started as port 2000 and up. Connect to the server as you would connect to the BMP with the CDCACM GDB serial server. GDB functionality is the same, monitor option may vary.
More arguments allow to
Print information on the connected target
blackmagic -t
Directly flash a binary file at lowest flash address
blackmagic <file.bin>
or with the -S argument at some other address
blackmagic -S 0x08002000 <file.bin>
Read flash to binary file
blackmagic -r <file>.bin
Verify flash against binary file
blackmagic -V <file>.bin
Show more options
blackmagic -h"
Used shared libraries:
libusb
libftdi, for FTDI support
Other used libraries:
hidapi-libusb, for CMSIS-DAP support
Compiling on windows
You can crosscompile blackmagic for windows with mingw or on windows with cygwin. For compilation, headers for libftdi1 and libusb-1.0 are needed. For running, libftdi1.dll and libusb-1.0.dll are needed and the executable must be able to find them. Mingw on cygwin does not provide a libftdi package yet.
PC-hosted BMP for windows can also be built with MSYS2,
in windows. Make sure to use the mingw64 shell from msys2, otherwise,
you may get compilation errors. You will need to install the libusb
and libftdi libraries, and have the correct mingw compiler.
You can use these commands to install dependencies, and build PC-hosted BMP
from a mingw64 shell, from within the src directory:
pacman -S mingw-w64-x86_64-libusb --needed
pacman -S mingw-w64-x86_64-libftdi --needed
pacman -S mingw-w64-x86_64-gcc --needed
PROBE_HOST=hosted make
To prepare libusb access to the ftdi/stlink/jlink/cmsis-dap devices, run zadig https://zadig.akeo.ie/. Choose WinUSB(libusb-1.0).
Running cygwin/blackmagic in a cygwin console, the program does not react on ^C. In another console, run "ps ax" to find the WINPID of the process and then "taskkill /F ?PID (WINPID)".
Supported debuggers
REMOTE_BMP is a "normal" BMP usb connected
| Debugger | Speed | Remarks |
|---|---|---|
| REMOTE_BMP | +++ | Requires recent firmware for decent speed |
| ST-Link V3 | ++++ | Requires recent firmware, Only STM32 devices supported! |
| ST-Link V2 | +++ | Requires recent firmware, No CDCACM uart! Cortex only! |
| ST-Link V2/1 | +++ | Requires recent firmware, Cortex only! |
| CMSIS-DAP | +++ | Speed varies with MCU implementing CMSIS-DAP |
| FTDI MPSSE | ++ | Requires a device descrition |
| JLINK | - | Usefull to add BMP support for MCUs with built-in JLINK |
Device matching
As other USB dongles already connected to the host PC may use FTDI chips, cable descriptions must be provided to match with the dongle. To match the dongle, at least USB VID/PID that must match. If a description is given, the USB device must provide that string. If a serial number string is given on the command line, that number must match with serial number in the USB descriptor of the device.
FTDI connection possibilities:
| Direct Connection |
|---|
| MPSSE_SK --> JTAG_TCK |
| MPSSE_DO --> JTAG_TDI |
| MPSSE_DI <-- JTAG_TDO |
| MPSSE_CS <-> JTAG_TMS |
+ JTAG and bitbanging SWD is possible
- No level translation, no buffering, no isolation
Example: Flossjtag.
| Resistor SWD |
|---|
| MPSSE_SK ---> JTAG_TCK |
| MPSSE_DO -R-> JTAG_TMS |
| MPSSE_DI <--- JTAG_TMS |
BMP would allow direct MPSSE_DO ->JTAG_TMS connections as BMP tristates DO when reading. Resistor defeats contentions anyways. R is typical choosen in the range of 470R
+ MPSSE SWD possible
- No Jtag, no level translation, no buffering, no isolation
| Direct buffered Connection |
|---|
| MPSSE_SK -B-> JTAG_TCK |
| MPSSE_DO -B-> JTAG_TDI |
| MPSSE_DI <-B- JTAG_TDO |
| MPSSE_CS -B-> JTAG_TMS |
+ Only Jtag, buffered, possible level translation and isolation
- No SWD
Example: [Turtelizer]http://www.ethernut.de/en/hardware/turtelizer/index.html)
schematics
The 'r' command line arguments allows to specify an external SWD resistor connection added to some existing cable. Jtag is not possible together with the 'r' argument.
Many variants possible
As the FTDI has more pins, these pins may be used to control enables of buffers and multiplexer selection in many variants.
FTDI SWD speed
SWD read needs two USB round trip, one for the acknowledge and one round-trip after the data phase, while JTAG only needs one round-trip. For that, SWD read speed is about half the JTAG read speed.
Reset, Target voltage readback etc
The additional pins may also control Reset functionality, provide information if target voltage is applied. etc.
Cable descriptions
Please help to verify the cable description and give feedback on the cables already listed and propose other cable. A link to the schematics is welcome.
Feedback
Issues and Pull request on https://github.com/blacksphere/blackmagic/
Discussions on Discord.
You can find the Discord link here: https://1bitsquared.com/pages/chat