Make sure you are using a TTL level USB-to-serial converter instead of a RS-232 cable. RS-232 has inverted level, and worse still, its -15V to 15V voltage range can burn your STM32. Make sure RX and TX are connected correctly. Try using stm32flash instead. Most STM32's serial bootloader does not support baud rate higher than 115200 as I remember.

Bootstrapping a boot loader. Let’s upload some code onto a new STM32 µC board (or one with unknown / incorrect code on it). As should be clear by now, there’s no other way with STM32F103 chips than to either use STM’s serial ROM boot, or SWD. Our blank chip is too dumb for anything else. In the application note AN2606 “STM32 system memory boot mode”, available on www.st.com. The calculation of the serial baud rate for USARTx, from the length of the first byte that is received, is used to operate the bootloader wit hin a wide range of baud rates. Removed, the other.

This is a litlle modified version of Tilen Majerle post of Program STM32F4 with UART. STM32F1 devices have great feature.

They can be programed with only USB to UART converter. Each device has bootloader inside, which supports UART programming. In this tutorial, I will go through step-by-step how to program device with USB-UART converter. I will use cheap USB2TTL CH340G converter. This will work on STM32F103C8T6 board. It also works on others, but they have UART port's on different pins. Step-by-step.

Insert you USB to UART converter to computer. Install drivers if necessary, prepare it to work, and go to device manager and get COMx number. In my case, I put CH340G converter, and I got result below. Download from ST’s official site. Install loader. There is no specific settings to set. It should be understandable how to install.

Open loader. You should get something like on image below. Before we can continue with loader program, we have to prepare hardware for UART bootloader. Get your board in hands and do stuff:. Set BOOT0 pin and set it to HIGH, BOOT1 pin leave it on LOW.

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Reset device. We need to connect our USB to UART converter with STM32F103C8T6 device. STM32F4 supports many UART combination. uart1 = TX: PA9; RX: PA10 (I tested with these pins, and works.).

uart2 = TX: PA02; RX: PA03. uart3 = TX: PB10; RX: PB11. Connect TX of STM32F103C8T6 with RX of converter and RX of STM32F103C8T6 with TX of converter. Let’s go back to out flash loader. Leave settings as they are, just change “Port Name“, to your port name. Hit “Next”. If you have lucky, then you can go to the next step.

If you are not lucky, then you will probably get an error like one below:. If you get this, first make sure that you have correct pinout.

Also, make sure that BOOT pins are set correct. Then, disconnect your board from power (USB or CH340G) and put power back, and in program test again. It should work and you should go to the next step. When you are OK with detection, you will get window like one below. You will get a new window, where you have to select target. You have to take a value, for your device. If you have 64KB flash size, select STM32F1Med-density64K.

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Hit “Next”. New window will open. There you have to select your.hex,.bin or.s19 file. Select file under “Download to device” section. Leave other settings as they are.

If you prototyping, you don't want to make changes the boot1 jumper, so you could check the option 'Jump to the user program'. That will execute the program immediately after the download finished. Hit “Next”. Program will automatically start with downloading data to STM32F103C8T6. Correct written data will be shown with window like my below.

Program is written to device, but if you try to reset device, it will not work. You have to remove jumpers and reset, so that program will boot from flash and not waiting for UART. Actually, only BOOT0 has to be set back to HIGH. BOOT1 does not matter where it is, program will still boot. Hope it helps for you.

Let’s upload some code onto a new STM32 µC board (or one with unknown / incorrect code on it). As should be clear by now, there’s no other way with STM32F103 chips than to either use STM’s serial ROM boot, or SWD. Our blank chip is too dumb for anything else. The purpose of this exercise is to prepare our board for use – not to go through these steps every time.

Once done, it will be running the secondary boot loader we just installed on it. Since this boot loader in stored in flash memory, it will then run whenever the µC is reset. If you think this is tedious: watch this.

It explains the steps needed, every time a PDP-8 computer is turned on! That’s right: toggling switches to enter the boot loader Serial upload Here is an example using an FTDI interface, as commonly used with ATmega’s / Arduinos: It uses 4 pins, from top to bottom on the FTDI board: RX, TX, +5V, GND. Connect these to the target as needed (those boards all differ), but make sure to cross the RX and TX lines, i.e. What the FTDI sends must be received by the target, and vice versa. Then, you need to put the target board into programming mode, i.e. Have it start up from its internal ROM, running the serial boot loader. To do this, set jumpers on the target:.

BOOT1 must be set to “0”, i.e. “pulled down” (this setting can be left permanently). BOOT0 must be set to “1”, i.e. “pulled up”.

finally, press the RESET button Now you need a utility on the PC side. Here is an example using: $ stm32loader.py -p /dev/tty.usbserial-A1014IN2 -ewv myboot.bin Reading data from myboot.bin Bootloader version 0x22 Chip id 0x410, STM32F1, performance, medium-density Writing 580 bytes to start address 0x8000000 Write 256 bytes at 0x8000000 Write 256 bytes at 0x8000100 Write 256 bytes at 0x8000200 Read 256 bytes at 0x8000000 Read 256 bytes at 0x8000100 Read 256 bytes at 0x8000200 Verification OK $ This example uploads a small dummy file to keep the output short. Last step: change the BOOT0 jumper back to “1”, and press RESET once more. ST-Link With ST-Link, the steps look similar, although this approach relies on JTAG / SWD, and the code transfer mechanism will be completely different. Here’s an example setup: As it so happens, the pinout on this board turned out to be just right for the ST-Link clone used in this setup. Usually, you’ll need wires. The wires are, top to bottom: GND, SWCLK, SWDIO, +3.3V.

Note that this example connects 3.3V, not 5V to the board’s regulator. With SWD, we usually don’t have to adjust the BOOOT0/BOOT1 jumpers. The exception is if the currently running code disables SWD. In that case, again: set BOOT0 to “0”, BOOT1 to “1”, and press RESET. For SWD, we’ll need to use the utility from GitHub: $ st-flash write myboot.bin 0x8000000 Loading device parameters. Device connected is: F1 High-density device, id 0x10036414 SRAM size: 0x10000 bytes (64 KiB), Flash: 0x40000 bytes (256 KiB) in pages of 2048 bytes Attempting to write 7036 (0x1b7c) bytes to stm32 address: 134217728 (0x8000000) Flash page at addr: 0x08001800 erased Finished erasing 4 pages of 2048 (0x800) bytes Starting Flash write for VL/F0/F3 core id Successfully loaded flash loader in sram 3/3 pages written Starting verification of write complete Flash written and verified!

$ Friendly chap, eh? As you can see, this is a somewhat larger µC variant of the STM32F103. For other SWD-capable JTAG programmers, there’s usually a solution via. Black Magic Probe With a BMP, we also use SWD to talk to the µC, very much like with an ST-Link, but with a different protocol. Here is an example setup, programming an: This uses a 0.05″ header and 10-pin ribbon cable, as common with some of the newer ARM boards. The 4-pin serial port pass-through is not used here. Since the official BMP does not power the target board (it only measures its voltage), a second USB is needed for the +5V.

The same notes apply as for the ST-Link: usually, there is no need to adjust the BOOT0 / BOOT1 pins – unless the current running code disables the SWD interface. Note that another way to force control with SWD, is to keep the RESET button pressed during the whole session. SWD, and uploading will work in this mode – while the µC is kept in reset. To upload using the BMP, we need to have the ARM build of installed. Also, this works best not with a myboot.bin file but with the original myboot.elf file generated by gcc: $ arm-none-eabi-gdb myboot.elf GNU gdb (GNU Tools for ARM. Reading symbols from myboot.elf.done. (gdb) tar ext /dev/cu.usbmodemDDE7C6C1 Remote debugging using /dev/cu.usbmodemDDE7C6C1 (gdb) mon swdp Target voltage: 3.3V Available Targets: No.

Att Driver 1 STM32F1 medium density (gdb) at 1 Attaching to program: /Users/jcw/myboot/myboot.elf, Remote target 0x1ffff3b6 in?? (gdb) load Loading section.text, size 0x19d8 lma 0x8000000 Loading section.data, size 0x14 lma 0x80019d8 Start address 0x80016ac, load size 6636 Transfer rate: 14 KB/sec, 829 bytes/write. (gdb) det Detaching from program: /Users/jcw/myboot/myboot.elf, Remote target (gdb) q $ Tip: you can use this to convert a.bin to a.elf file which gdb will accept.

MBED-enabled MBED enabled boards have an ST-Link built-in – use the same code as mentioned earlier. But it’s also possible to re-use these boards as ST-Link programmer for external targets. Radio scanner software for mac os x.

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Here’s the top section of a Nucleo board, cut off to act as stand-alone ST-Link (or leave it on, if you prefer). This also supports drag-and drop uploads, since it’s an ST-Link V2.1: What you see here is an extra board on top, with a header matching the HY-TinySTM103T board. Doing this for boards which you intend to use a lot is highly recommended – it’s just one less detail to keep checking whenever you grab this tool to fix a broken setup.

Poor-man’s boot loader upload Note that to get something loaded onto a blank STM32 µC, you always need something like one of the setups described so far. It’s the chicken vs the egg problem in its full glory. But what if you don’t have any of the above, properly working and ready to go? Well, there is also another option if you have a working Arduino, JeeNode, or other IDE-compatible board. You can turn one of those boards into a temporary STM32 uploader! Here’s an example of an old Arduino programming a blank HY-TinySTM103T: A 2005-era board updating one from 2015 – how’s that for a “flash from the past”, eh? The basic idea is to run on that Arduino.

It knows about STM’s serial upload protocol, and contains a complete copy of the boot loader to send to the ARM µC. Check the source code for more information. An example of the output after a successful run: Connecting? OK Boot version: 0x22 Chip type: 0x410 Unprotecting: OK Resuming? OK Erasing: OK Writing: OK Done: 6661 bytes uploaded. Via OpenOCD With, there are many other ways to set up a JTAG / SWD programmer. For an interesting approach, see this, which uses 6 pins on a Raspberry Pi’s (or compatible) expansion header.

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The gdb debugger can then connect to it via the network. Or, the more traditional approach: on the Raspberry Pi and plug in one of the many supported ready-made JTAG adapters via USB. Again, reachable via the network. This concludes another essential summary of things needed to get going with STM32 µCs. We still need to decide what boot loader to install using any of the above methods, but that’s beyond the scope of this article. The key is that with a boot loader of our choosing installed, we can finally start to use these STM32 µC boards. to article index.