jtag
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jtag [2019/02/20 11:50] – [SEGGER J-Link] kingkevin | jtag [2021/01/18 16:56] – [SEGGER J-Link] add OB kingkevin | ||
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For $9 you can't expect more, and if you want a cheap adapter I recommend the other ones (see below). | 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 | + | ==== mini ST-LINK V2 ==== |
These adapters come in a small dongle sized aluminium case. | These adapters come in a small dongle sized aluminium case. | ||
They supports SWD, and SWIM (for STM8), but not JTAG. | They supports SWD, and SWIM (for STM8), but not JTAG. | ||
+ | Also the RST signal (required for SWIM) is not controllable as SRST in SWD mode (at least not by OpenOCD). | ||
- | At $2.5 they are the cheapest | + | For less than $2, they are the cheapest |
- | One trick to get this ridiculously low price is to use STM32F101 micro-controllers. | + | I also like to use them as development board when I just need a USB dongle |
- | Compared to the STM32F103 micro-controllers they offer less functionalities, | + | |
- | 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, but it seems that USB still works well enough. | + | |
- | At least this is my guess. | + | |
- | It would be interesting to check if the other STM32F103 peripherals normally not present on the STM32F101 work as well, but I wouldn' | + | |
- | After all, they are probably marked as STM32F101 for a good reason.\\ | + | |
- | Similarly the STM32F103C8 is only rated having 64 kB of flash because it didn't pass the flash test, compared | + | |
- | Several | + | Numerous |
- | Always check the pinout on the aluminium case since this also varies. | + | Always check the pinout on the aluminium case and on the PCB since this also varies. |
+ | Here are the board variants I got, in chronological order. | ||
=== 2014-06-22 ST-LINK V2 === | === 2014-06-22 ST-LINK V2 === | ||
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{{: | {{: | ||
- | I' | + | I've reversed the {{: |
+ | |||
+ | One trick to get this ridiculously low price is to use STM32F101 micro-controllers. | ||
+ | Compared to the STM32F103 micro-controllers they offer less functionalities, | ||
+ | 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, but it seems that USB still works well enough. | ||
+ | At least this is my guess. | ||
+ | It would be interesting to check if the other STM32F103 peripherals normally not present on the STM32F101 work as well, but I wouldn' | ||
+ | After all, they are probably marked as STM32F101 for a good reason.\\ | ||
+ | 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, | ||
One other nice trick they used is to have twos LEDs on the same pin (PA9): | One other nice trick they used is to have twos LEDs on the same pin (PA9): | ||
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* 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). | * 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 | + | === alternative pinout |
{{: | {{: | ||
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This one has an " | This one has an " | ||
+ | |||
+ | === SWDIO/SWCLK swap === | ||
+ | |||
+ | {{: | ||
+ | {{: | ||
+ | {{: | ||
+ | |||
+ | This variant uses an STM32F103. | ||
+ | It seems this micro-controller got so popular that it is now cheaper than the STM32F101 (with less features). | ||
+ | The annoying details of this variant is that the SWDIO and SWCLK signal described on the pinout engraved in the aluminium case are swapped. | ||
+ | This shows again the importance of also checking the pinout on the board itself, else you can waste a couple of hours debugging. | ||
+ | |||
+ | === QFN === | ||
+ | |||
+ | {{: | ||
+ | {{: | ||
+ | {{: | ||
+ | |||
+ | This variant uses an STM32F103 in the UFQFN-48 package. | ||
+ | This is just a couple of cents cheaper than the more traditional TQFP-48 package, but this is enough en mass to change the footprint on the board. | ||
+ | |||
+ | === MINI ST-Link V2E === | ||
+ | |||
+ | {{: | ||
+ | {{: | ||
+ | {{: | ||
+ | |||
+ | Instead on an STM32F103, this dongle uses a [[http:// | ||
+ | I've seen pin compatible alternatives (ST STM8S003 vs Nuvoton N76E003), even architecture compatible (ST STM32F103 vs GigeDevice GD32F103), but they always had some differences (architecture, | ||
+ | The CS32F103 seems like a complete clone of the STM32F103 (exact same pinout, architecture, | ||
+ | So far I could not not see any difference (I tested flash, USB, SWD). | ||
+ | I guess this micro-controller is so popular that it was just a question of time until it was ripped-off. | ||
+ | To check if this is a complete clone you could decapsulate the chip and compare the silicon die, or check the errata behaviour (I can't imagine they re-implemented it themselves, up to the mistakes). | ||
+ | The next step would be to have a CS32F103 chip in a package marked as STM32F103. | ||
+ | |||
+ | == GC == | ||
+ | |||
+ | {{: | ||
+ | {{: | ||
+ | {{: | ||
+ | |||
+ | Most ST-LINK minis which I get now use the CKS32 chip. | ||
+ | I'm a bit sad because the CS32F103C8 really only has the advertised 64 KB of flash, while the STM32F103C8 actually has 128 KB (e.g. what the STM32F103CB has), and when you have a lot of debugging strings in your firmware, you very soon reach the limit of the 64 KB. | ||
+ | Thus, on my quest to find ST-LINK minis with STM32F103 (e.g. where the ground pin is not between SWDIO and SWCLK) I landed on this one. | ||
+ | Sadly it also does not use a STM32F103, but a STM32GC102C8. | ||
+ | I have no idea what this chip is. | ||
+ | The GC series does not exist (at least ST doesn' | ||
+ | I'm not sure if this was to save cost, because this is the first board I see with 2 ESD protections (one for USB, the other for SWDIO/SWCLK in addition to the inline protection resistors, and none for RST/SWIM). | ||
==== Baite ==== | ==== Baite ==== | ||
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The [[https:// | The [[https:// | ||
That makes it one of the most complete JTAG adapter. | That makes it one of the most complete JTAG adapter. | ||
+ | The differences between the versions are documented [[https:// | ||
- | There are plenty of different J-Link clones available, from light version with the minimum number of components, to full version with all features. | + | There are plenty of different J-Link |
+ | But v8 and v9 are not supported anymore by J-Link, meaning no new feature will be added to them. | ||
+ | Instead I recommend to get the [[https:// | ||
- | The come in the same case: | + | Here pictures from devices not from official distributors, |
+ | |||
+ | They come in the same case: | ||
{{: | {{: | ||
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{{: | {{: | ||
{{: | {{: | ||
+ | |||
+ | Here a J-Link v10. | ||
+ | It uses a NXP LPC4337 which supports USB high speed, and allows faster debugging speeds. | ||
+ | In addition to the others, it adds cJTAG support: | ||
+ | |||
+ | {{: | ||
+ | {{: | ||
+ | |||
+ | Here a [[https:// | ||
+ | It is supposed to be embedded on development board and provide an easy way to flash the main micro-controller. | ||
+ | It have much less capabilities (no JTAG, only SWD, ...) and less protections, | ||
+ | Additionally it provides a UART interface, ideal for printf debugging. | ||
+ | I actually can be implemented on several micro-controller, | ||
+ | |||
+ | {{: | ||
+ | {{: | ||
+ | |||
+ | |||
===== Texas Instruments XDS100v3 ===== | ===== Texas Instruments XDS100v3 ===== | ||
- | The [[http:// | + | The [[http:// |
+ | |||
+ | Note: this adapter uses the [[http:// | ||
{{: | {{: |
jtag.txt · Last modified: 2024/01/07 17:49 by 127.0.0.1