Differences

This shows you the differences between two versions of the page.

--- jtag [2016/02/17 10:22] – fix JTAG to SWJ, restructure kingkevin
+++ jtag [2017/03/30 13:38] – [aluminium] kingkevin
@@ Line 8: / Line 8: @@
 The Debug Port is often called JTAG-DP for JTAG and SW-DP for SWD.
 SWJ capable device include and often combine both, as the SWD signal pins SWDIO and SWCLK re-use the JTAG signal pin JTMS and JTCK (backwards compatible).
+Most 32 bits micro-controllers and SoCs have one of both (or both).
-Most 32 bits micro-controllers and SoCs have one of both (or both).\\
 On the other side you need a SWJ adapter so the host can speak to the device using the JTAG and/or SWD protocol.
 SWJ adapters can go from cheap (<5$) to expensive (>1000$), depending on the quality of the hardware and software.
@@ Line 57: / Line 57: @@
 I am using cheap clones.
+==== ST-LINK/V2 clone ====
+{{:jtag:mb936_case-front.jpg?0x150|case front}}
+{{:jtag:mb936_case-back.jpg?0x150|case back}}
+{{:jtag:mb936_internal-front.jpg?0x150|internal front}}
+{{:jtag:mb936_internal-front2.jpg?0x150|internal front}}
+{{:jtag:mb936_internal-back.jpg?0x150|internal back}}
+This is a complete rip-off of the [[http://www.st.com/web/catalog/tools/FM146/CL1984/SC724/SS1677/PF251168|ST-LINK/V2]].
+It comes in the same box, with the same cables, the enclosure is the same, even the board name has been taken over (MB936), but the board isn't the same.
+The BOM doesn't match with the [[http://www.st.com/resource/en/bill_of_materials/st-link_v2_bom.zip|original]].\\
+The original adapter come with ESD protection, protection resistors, and a transceiver to allow operating with target signal levels of 1.65V to 5.5V.
+This is completely missing on the clone since the connector pins are directly connected to the micro-controller.
+Thus it only supports target signal levels of 3.3V and sometimes 5V since the pins are 5V tolerant.
+For $9 you can't expect more, and if you want a cheap adapter I recommend the other ones (see below).
+==== ST-LINK V2 aluminium ====
+These adapters come in a small dongle sized aluminium case.
+They supports SWD, and SWIM (for STM8), but not JTAG.
+At $2.5 they are the cheapest clones you can find.\\
+One trick to get this ridiculously low price is to use STM32F101 micro-controllers.
+Compared to the STM32F103 micro-controllers they offer less functionalities, like USB ... yet this is a USB dongle!
+Well this is because these micro-controllers use the same die, but if not all STM32F103 feature tests pass after production they get packages as STM32F101, and it seems that USB still works well enough ;).\\
+Similarly the STM32F103C8 is only rated having 64 kB of flash because it didn't pass the flash test, compared to the 128 kB for the STM32F103CB, but they very often have more (you can verify by read/writing and check for errors).
+Several board versions exist and it is hard to know what you will get.
+Always check the pinout on the aluminium case since this also varies.
+=== 2014-06-22 ST-LINK V2 ===
+{{:jtag:alu_dongle_front.jpg?0x100|}}
+{{:jtag:alu_board_front.jpg?0x100|}}
+{{:jtag:alu_board_back.jpg?0x100|}}
+I've also reversed the {{:jtag:alu.pdf|schematic}} for this board.
+One other nice trick they used is to have twos LEDs on the same pin (PA9):
+  * when the pin is set to output high, only one LED lights up
+  * when the pin is set to output low, the other LED light up
+  * when set to input floating, both LEDs are off
+  * when PWM output is used, you can mix the two colors (red and blue) quite well due to the persistence of vision (also because the LEDs are next to each other and the small hole in the case is in the center).
+=== swapped ===
+{{:jtag:reverse-gnd_case-front.jpg?0x100|}}
+{{:jtag:reverse-gnd_internal-front.jpg?0x100|}}
+{{:jtag:reverse-gnd_internal-back.jpg?0x100|}}
+From the outside this looks very similar to the previous one, except that the connector pinout is very different (except for power).\\
+No markings are on the board.
+=== 2016-01-18 MX-LINK V2 ===
+{{:jtag:mx-link__case-front.jpg?0x100|}}
+{{:jtag:mx-link__internal-front.jpg?0x100|}}
+{{:jtag:mx-link__internal-back.jpg?0x100|}}
+This one has an "M" logo instead of the ST logo, probably corresponding to the "MX-LINK V2" marking on the board.
 ==== BAITE ====
@@ Line 85: / Line 145: @@
 the adapter pins are protected with a 220 ohms resistor.
-==== aluminium ====
-This [[http://www.aliexpress.com/item/Hot-Sale-1PCS-ST-LINK-Stlink-ST-Link-V2-Mini-STM8-STM32-Simulator-Download-Programmer-Programming/32343514985.html|one]] comes in aluminium case.
-It supports SWD, and SWIM (for STM8), but not JTAG.
-They replaced the additional JTAG pins with power pins.
-{{:jtag:dsc02407.jpg?0x100|device front}}
-{{:jtag:dsc02408.jpg?0x100|device back}}
-{{:jtag:dsc02415.jpg?0x100|PCB front}}
-{{:jtag:dsc02410.jpg?0x100|PCB back}}
-STM32F103C8 connection:
-^ STM32F103C8 signal ^ STM32F103C8 pin ^ adapter pin ^ adapter signal ^
-| PB6 | 42 | 1 | RST |
-| PB14 | 27 | 2 | SWDIO |
-| USB GND |  | 3 | GND |
-| USB GND |  | 4 | GND |
-| PB8/PB11 | 45/22 | 5 | SWIM |
-| PA5/PB13 | 15/26 | 6 | SWCLK |
-| LDO VCC |  | 7 | 3.3V |
-| LDO VCC |  | 8 | 3.3V |
-| USB VCC |  | 9 | 5V |
-| USB VCC  |  | 10 | 5V |
-| PA9 | 30 | current source  | LED |
 ===== Altera USB-Blaster =====