Note that these are the famous “0Ω” resistors: i.e. Or just apply more heat and unsolder them properly. The quick-and-dirty way is to break those resistors with a small cutter, and then remove the debris with a soldering iron. But if you also want to use the ST-Link for the RX, TX, SWO, or NRST pins – you need to cut those connections.
If you only use SWCLK and SWDIO, then you’re done. Solder jumpers SB12, SB13, SB14, and SB15 are used to connect the ST-Link to the rest of the board. But if you leave the ST-Link attached to the rest of the board you must make some changes to make it work for external use – here is the underside of the ST-Link: Warning – Without external hook-up, you can still use the ST-Link as programmer for the attached Nucleo. Why this layout? Because pins 2.7 match the programming header on a HY-TinySTM103T. N/C (solder jumper can be closed to connect to SWO)īy cutting one or more traces inside the solder jumpers, you can rearrange these at will.There’s a footprint for an 8-pin header on the left with the following top-to-bottom layout: Note that these pins are not all on a 0.1″ grid, so you can’t hack a bit of prototype board onto the ST-Link without bending its pins a bit. This board is set up to fit on the above ST-Link headers, and can be soldered directly to the pins to create a permanent setup. Here’s a little PCB for it (a prototype production run is on its way): The programming header pins are, top-to-bottom: The main pins are the ST-Link “SWD header” (CN4) and those marked TX and RX (CN3). The pins on the top left and right are only used as spacers. What we’re after, is to re-use the ST-Link for our own external boards. These connect the ST-Link to the board it’s attached to. The first thing to do is remove those two jumpers. You could saw the bottom part off (can’t break it easily, unfortunately). That’s why any Nucleo board will do here. It’s a great way to get started, because they include a built-in “ST-Link V2.1” programmer:Īctually, the programmer is the only part we’re interested in here. The Nucleo boards by STMicroelectronics cover a fascinating range of STM ♜’s, and are provided for non-commercial use at very low cost.
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