External STLink V2: Difference between revisions
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TDO/TRACESWO (13) CN10-31 White PB3 JTAG '''T'''est '''D'''ata '''O'''utput | TDO/TRACESWO (13) CN10-31 White PB3 JTAG '''T'''est '''D'''ata '''O'''utput | ||
NRST (15) CN7-14 Orange Active Low Reset | NRST (15) CN7-14 Orange Active Low Reset | ||
TRST (3) CN10-27 Purple PB4 JTAG '''T'''est '''R'''e'''S'''e'''T''' | |||
TRST, ”Test Reset” (low active) is used for an asynchronous reset of the JTAG Test Access Port (TAP). | |||
It resets the TAP state machine and on most ARM families the debug register | |||
* The wire colors depicted here are not part of any standard but what we used to keep track of each signal | * The wire colors depicted here are not part of any standard but what we used to keep track of each signal | ||
| Line 43: | Line 46: | ||
https://www.tincantools.com/wp-content/uploads/2018/08/Flyswatter2-20-Pin-JTAG-Connector.pdf<br> | https://www.tincantools.com/wp-content/uploads/2018/08/Flyswatter2-20-Pin-JTAG-Connector.pdf<br> | ||
It appears there's a 10-pin connector version: http://software-dl.ti.com/ccs/esd/documents/xdsdebugprobes/emu_jtag_connectors.html<br> | It appears there's a 10-pin connector version: http://software-dl.ti.com/ccs/esd/documents/xdsdebugprobes/emu_jtag_connectors.html<br> | ||
10-Pin Adapter board with cable: https://www.digikey.com/product-detail/en/olimex-ltd/ARM-JTAG-20-10/1188-1016-ND/3471401 | |||
Latest revision as of 20:14, 30 August 2020
External STLink V2
My friend Rusty and I sat down after breakfast one Saturday morning and decided we wanted to use our new STLink V2 units to talk to our new NUCLEO-F103RB boards using JTAG vs the on-board SWIM (SWD).
Using STM32CubeMX and Keil uVision 5, we built a typical "Blinky" program and attempted to download the program to flash using the JTAG interface.
Here's the result of our exploration:
1) Connect the external ST-Link unit to the NUCLEO board
This example is using the NUCLEO-F103RB board JTAG Signal (20 pin) NUCLEO Attach Point Wire* Comment VCC (1) CN7-12 Red Required - Adapter senses target supply voltage GND (20) CN7-8 Black Common ground TMS / SWDIO (7) CN7-13 Blue PA13 JTAG Test Mode Selection / Serial Wire Data Input/Output TCK / SWCLK (9) CN7-15 Yellow PA14 JTAG Test CLocK / Serial Wire Clock TDI (5) CN7-17 Green PA15 JTAG Test Data Input TDO/TRACESWO (13) CN10-31 White PB3 JTAG Test Data Output NRST (15) CN7-14 Orange Active Low Reset TRST (3) CN10-27 Purple PB4 JTAG Test ReSeT TRST, ”Test Reset” (low active) is used for an asynchronous reset of the JTAG Test Access Port (TAP). It resets the TAP state machine and on most ARM families the debug register * The wire colors depicted here are not part of any standard but what we used to keep track of each signal
2) It is recommended to remove the two ST-LINK jumpers on the NUCLEO board, at CN2.
This disconnects the on-board debug adapter from the target processor.
3) Plug in the USB debug adapters
Plug in the External ST-Link adapter first, and then the NUCLEO board.
4) Configure the adapter
When applying power to the NUCLEO board as well as the external STLink-V2, the Keil IDE
saw two USB debug adapters, the on-board one and the external one. The on-board one was
labeled "ST-LINK/V2-1", and the external one was labeled "ST-LINK/V2".
The debug adapter to use and settings for the adapter are configured under:
Project -> Options for Target <project name> -> Debug tab -> ST-Link Debugger (Settings) ->
Debug Adapter Unit: {{#if:|{{#ifexpr:({{#time:U|{{{3}}}}} - {{#time:U|now}}) > 0|ST-LINK/V2|ST-LINK/V2}}|ST-LINK/V2}}
If all the wires are connected correctly, within that Debug Adapter settings dialog,
Target Com Port: selecting {{#if:|{{#ifexpr:({{#time:U|{{{3}}}}} - {{#time:U|now}}) > 0|JTAG|JTAG}}|JTAG}} or {{#if:|{{#ifexpr:({{#time:U|{{{3}}}}} - {{#time:U|now}}) > 0|SW|SW}}|SW}} should both display information in the
Target Device window.
Select "JTAG"
Click on "OK" button(s) to close the dialogs
5) Build the application(F7)
6) Download (F8)
The program should download to the target.
7) Press the reset (black) button to begin running the program.
Reference Documentation
https://www.st.com/resource/en/user_manual/dm00026748-stlinkv2-incircuit-debuggerprogrammer-for-stm8-and-stm32-stmicroelectronics.pdf
https://www2.lauterbach.com/pdf/arm_app_jtag.pdf
https://www.tincantools.com/wp-content/uploads/2018/08/Flyswatter2-20-Pin-JTAG-Connector.pdf
It appears there's a 10-pin connector version: http://software-dl.ti.com/ccs/esd/documents/xdsdebugprobes/emu_jtag_connectors.html
10-Pin Adapter board with cable: https://www.digikey.com/product-detail/en/olimex-ltd/ARM-JTAG-20-10/1188-1016-ND/3471401