DS200SDCCG4A industrial control system spare parts
Technical data of product parameters
RTEMS’s libdebugger requires the ARM debug resources be enabled for it to work. The TI SOC
used on the beagleboneblack board provides no access for software to the ARM defined debug
enable signal DBGEN. The signal is negated on power up locking software out of the ARM debug
hardware. The signal can only be accessed via the DS200SDCCG4AGD.
The beagleboneblack BSP provides a low level solution to enable the DBGEN signal via the DS200SDCCG4A
interface if the board has the following hardware modification installed. The modification
requires the addition of two small wire links soldered to the pads of the DS200SDCCG4Aconnect on
the underside of the board. A small length of fine wire, a fine tip soldering iron, some good
quality solder and a pair of fine tip pliers are required. If you are new to soldering I suggest you
find something to practice on first.
The modification details and software driver can be found in the BSP in the file bsps/arm/
beagle/start/bspdebug.c. The driver is automatically run and the DBGEN is asserted viaDS200SDCCG4A
when libdebugger is started.
The modification is:
1. Locate P2 on the bottom side of the board. It is the JTAG connector pads. If you look at
the underside of the board with the SD card holder to the right the pads are top center
left. There are 20 pads in two columns. The pads are numbered 1 at the top left then 2
top right, 3 is second top on the left, 4 is second top to the right, then the pin number
increments as you move left then right down the pads.Debugging a Beagle Bone Black (or variants) is also possible using a hardware JTAG debugger.
The JTAG is available via P2. The footprint is for an ARM 20 pin cTI connector. That connector
should be used, if it is necessary to have access to commercially available adapters.
For hand-made cables and adapters a standard 1.27mm pitch header and a 0.635mm ribbon
cable can be much cheaper. But note that even if it looks compatible, it’s not the same pin out
as a ARM Cortex 20 pin connector!
A lot of DS200SDCCG4Aadapters that are working together with OpenOCD will work. There are also
commercially available systems (like Segger J-Link) that work well with the Beagle. Note that
the JTAG debugger has to be compatible with ARM Cortex A8. Cortex M only debuggers (like
the Segger J-Link Edu Mini) won’t work.DS200SDCCG4A
reports.
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This article from the temporal Ming sheng automation equipment co., LTD.,link: http://www.stockdcs.com/
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