diff options
Diffstat (limited to 'source/jtag.rst')
| -rw-r--r-- | source/jtag.rst | 81 |
1 files changed, 0 insertions, 81 deletions
diff --git a/source/jtag.rst b/source/jtag.rst deleted file mode 100644 index caba223..0000000 --- a/source/jtag.rst +++ /dev/null @@ -1,81 +0,0 @@ -.. highlight:: cpp - -.. _jtag: - -JTAG -==== - -.. FIXME [0.1.0] Updated adapter schematic, better information - -JTAG is an interface for low-level debugging of digital devices. It -gives instruction by instruction control over the microprocessor and -allows data to be read and written to arbitrary memory and register -locations. It is typically used with a debugging tool like `gdb -<http://www.gnu.org/software/gdb/>`_ when hacking low level routines -and hardware peripherals (we use it when working on :ref:`libmaple -<libmaple>`) or to flash a new bootloader. - -Note that the STM32 on the Maple has a built-in low level serial -debugger which could also be used to flash bootloaders, and -:ref:`lang-assert` allows basic debugging over a USART serial channel. -We expect only fairly advanced users to use this feature. - -.. contents:: Contents - :local: - -Wiring Diagram --------------- - -.. figure:: /_static/img/jtag-wiring.png - :align: center - :alt: JTAG wiring diagram - :width: 7.4in - :target: _images/jtag-wiring.png - - JTAG wiring diagram (`large version <_images/jtag-wiring.png>`_) - to connect a standard 20-pin ARM JTAG device to the 8-pin JTAG port - on the Maple. - -The Maple has holes for a 8-pin JTAG header, but that header is not -soldered on. To use JTAG, simply solder on standard 0.1" pitch male -header pins (either the exact 4 by 2 block, or two 4-pin pieces of -straight breakaway header). - -Compatible Devices ------------------- - -We have had good experience with the `Olimex ARM-USB-OCD -<http://www.olimex.com/dev/arm-usb-ocd.html>`_ device, which costs -about €55 plus shipping (as of April 2011). - -Function Reference ------------------- - -You can disable or enable the JTAG and Serial Wire debugging ports in -software using the ``disableDebugPorts()`` and ``enableDebugPorts()`` -functions. - -* :ref:`lang-disabledebugports` -* :ref:`lang-enabledebugports` - -Recommended Reading -------------------- - -* `Wikipedia Article on Joint Test Action Group (JTAG) - <http://en.wikipedia.org/wiki/Joint_Test_Action_Group>`_ - -* `STM32, GDB, OpenOCD How To - <http://fun-tech.se/stm32/OpenOCD/gdb.php>`_ - -* `LeafLabs Wiki JTAG How To - <http://wiki.leaflabs.com/index.php?title=Maple_JTAG_How_To>`_ - -* `LeafLabs forum thread on JTAG - <http://forums.leaflabs.com/topic.php?id=536>`_ - -* ST documentation: - - * Reference Manual `RM0008 - <http://www.st.com/stonline/products/literature/rm/13902.pdf>`_ - (PDF), Chapter 31, "Debug support", and Chapter 9, - "General-purpose and alternate function I/Os". |