STM32F4 devices have great feature. They can be programed with only USB to UART converter. Each device has bootloader inside, which supports UART programming. This is not very great method for Discovery boards, because they have better and faster solution on board, ST-link. But if you are working own board, then this solution can be quite nice. In this tutorial, I will go through step-by-step how to program device with USB->UART converter.

I will use FTDI’s home made converter. This will work on all STM32F4 boards (Discovery, Nucleo). Also, if you create own board.

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 FTDI converter, and I got result below. Flash loader demonstrator opened • Before we can continue with loader program, we have to prepare hardware for UART bootloader. Get your board in hands and do stuff: • Find BOOT0 pin and set it to HIGH. On discovery boards, VDD pin is near BOOT0 pin, so if you have jumper, just put it on. • Find PB2 ( BOOT1) pin and set it LOW.

STM32 Flash Loader Demonstrator. The STM32 microcontroller chips include a UART bootloader that will cause the chip to switch to boot mode if pin BOOT is set high. Stm Flash Loader Demo Download. There has been several requests among users to explain more about loading programs in to flash memory of STM32.

On discovery boards, GND pin is near PB2 pin, so if you have jumper, just put it on. • If you don’t have jumpers, you can take 2 provided on discovery board. They are on the GND, if you rotate discovery board, under ST-link. • Reset device • We need to connect our USB to UART converter with STM32F4 device. • STM32F4 supports many UART combination.

• TX: PA9; RX: PA10 • TX: PB10; RX: PB11 • TX: PC10; RX: PC11 • I tested with these pins, maybe there are more pins. • If you are working with STM32F4-Discovery, then pins PA9 and PA10 will not work, because they have capacitor for USB connected to this pin. Use any other combination. • Connect TX of STM32F4 with RX of converter and RX of STM32F4 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 point 11.

Provides Flashing for STM32 and STM8 controllers. Application Details: Version: 2.0. License: Free to use. URL: Votes: 0. Latest Rating: Gold. Latest Wine Version Tested: 1.4.1. Maintainers: About Maintainership. No maintainers. Volunteer today! Free Download Download page. Test Results. Old test results.

• If you are not lucky, then you will probably get an error like one below. Read before commenting! Before you make a new comment, make sure you agree with things listed below: • - Read post to make sure if it is already posted what you are asking for, • - Make sure you have the latest version of libraries used in your project, • - Make a clean and grammatically correct written message, • - Report as many details as possible, including what have you done so far, • - Do NOT post any code here. Use, • - Do NOT post any error codes here. Use, • - Specify STM32Fxxx family and used Discovery/EVAL/Nucleo or custom made board, • - Make sure your clock is set correct for PLL, • - If you are using my HAL drivers, please how to start. Comment will be deleted on breaking these rules without notification!

I am not able to get the ST Flash loader to recognize the STM32 on the MP32. I get the following error: 'No response from taget, the Boot loader can not be started. Please, verify the boot mode configuration and the flash protection status.' Settings-Config: A) ST Flash Loader: 115200, 8, even, (echo disabled). B) I am using an ftdi usb-232 converter with a 232 shifter smd at the end (): A picture of my configuration is at the bottom. Regarding B, this seriel configuration is working when I connect to either of the usarts on the StmDiscovery board.

In fact on the discovery board, with respect to usart#1, I am connecting to pins Pa9 & Pa10 (same as MP32). I am noticing that when I press next on ST flash Loader I can see the Tx and Rx blip momentarily, and then the Rx led on the 232-ttl converter stays on slightly dim (until I press the reset button on the MP32). When I power up the board with the 'jumper' removed, JP11-5 is High and JP11-6 is low. I am not 100% sure, but I believe JP11-6 corresponds to the Boot_0 pin on the STM32.

I tried several different buad rates in Flash Loader, but didnt have any luck. Also, I tried all the above on my deskop (which has serial ports). I used the same level shifter at the end of the cable. In all the above I also tried switching the Rx and Tx going to the MP32 (in case I had them backworks)s.

I even tried pressing the reset after powering the board up, before trying the use the Flash Loader. The only thing I didn't think of until now (editing post) is that on the Discovery Board I powered the 232=ttl convertor at 3.3. When connected to the MP32 it is being powered at 5. What level is the usart? Is there anything I overlooked? Thanks, JimT Tags.

Hello Jim, I am using a USB FTDI Cable. I have setup the same parameters as you for serial setting. I am using TTL Tension, i.e 5.5V as this is supported but 3.3V is ok also. You should remove the jumper and reboot the proc to activate the serial bootload process.

Initially I have the same trouble. My mistake was an inverted connection of the Tx/Rx connector! Then, I have a problem in the following menus of ST Flash Demo when trying to upload a binary File.

In the ' Download to Device' selection, you should activate the 'Global Erase' Option to be able to load correctly a binary file. This option is not setup by default! Hope this help! Mario • • Reply by on March 24, 2011 at 9:05pm. Problem Solved, My 232-TTL level shifter did not like being powered on the 5v bus as depicted in the picture above. I guess the converter I bought isn't as smart as a max232. After getting some sleep I looked at the differences between the config above and the Discovery board, and realized the diff was that on the discovery board I was using 3v3 (NOT 5v).

Well, I hope I didn't exercise anyone needlessly, especially Roberto. For anyone having this issue, trying to use the same 232-TTL converter; here is a pic of what works: • • Reply by on March 25, 2011 at 6:16pm.

I actually experience the same problem, i.e., the Flash Loader Demonstrator won't always recognize the MP32. Sometimes I have to try several times until it finally recognizes it. I am also using the 5V output of the MP32 as the power supply for the RS232/TTL converter. Hint: There is a tool that will display all the communication of the serial/RS232/COM port(s) of your Windows PC. It is originally made by two very smart guys, who sold their company to Microsoft some time ago, so the tool can now be found there. However, the old web site still works (and gets redirected to MS): - go to the Utilities Index and download the PortMon tool. No need to install, just unZIP and run.

Various other very smart and helpful expert tools available there also. HTH, Stephan • • Reply by on March 25, 2011 at 6:29pm. This morning I was playing with Flash Loader and found that from the 1st screen (where you specify port and parameters): When you hit next (from a fresh power up or reset) it finds the MP32. Once this is accomplished it wont work again (i,e, if you hit back and try again it does not find it) until a reset or cycle power is performed. I think the STM32 goes into some special mode once it handshakes with the Flash Loader (when the flash loader identifies the device and presents the second screen).

I repeated this several times and it appears to behave consistently; each time I simply reset the mp32 before hitting next and all is OK. This may be what confused me last night, and prompted my comment that Elisa responded to. This brings up another question/comment: the Oilpan reset button does not appear to be mapped to the mp32 reset. I am going to try and find a schematic for the oilpan (not eaglecad, but pdf of some sort). I hate pulling the oilpan on/off repeatedly. • • Reply by on March 25, 2011 at 6:42pm. I am having a problem communicating with my board using flash bootloader.

I am designing a breakout board for the STM32F103RB, I have the UART1 pins out so I can use flash programming rather than JTAG, but I am having no luck with ST flash programmer it gives me different problem messages. 1) 'Unrecognized device.please, reset your device then try again' 2) 'No response from the target, the boot loader can not be started. Please verify the boot mode configuration and the flash protection status, Reset your device then try again' 3) 'Cannot get available commands, please, try to change echo selection, reset your device then try again' Board: ==== I have a custom made board, which I confirm is working since I have the JTAG pins out as well and was able to connect and program it using Olimex ARM-USB-OCD + Eclipse Appreciate your feedback.