Board with STM32F103ZET6 « LeafLabs Garden

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Board with STM32F103ZET6

(6 posts) (3 voices)

Started 1 year ago by konan
Latest reply from ala42

konan
Member

Hi all! I've bought the development board with ZET6 CPU, this one: http://www.aliexpress.com/item/ARM-Cortex-M3-Mini-Stm32-Stm32F103ZEt6-Cortex-Development-Board-72MHz-512KFlash-64KRAM-FZ0620-Free-SHipping/1211122989.html

It has onboard USB-UART bridge, linked to USART1, so I easily (and successfully) flashed the bootloader for Maple Native. But when I try to upload any program (I tried the "Blink" example), the upload process seems to succeed, but after reboot the device remains in DFU mode. The DFU mode works, so I can compile and upload the program again, with the same result. Both BOOT0 and BOOT1 are unconnected. Does anyone have an idea, why my program doesn't start?

Posted 1 year ago #
gruvin
Member

Did you include BOARD=maple_native or export a variable, thus ...

export BOARD=maple_native

?

Just guessing. But that's about the same symptom that you described, as I got when I was compiling for the wrong board. (The default is the plain, original, maple -- not RET6, not mini, not native.)

Posted 1 year ago #
konan
Member

gruvin, I selected "Maple Native" in the IDE Tools/Board menu. For other boards (Maple 3+ and Mini) this was quite enough :)

The main difference of my board from Maple Native is that there's no SRAM on it. Does anybody know, is the SRAM presence necessary to bootloader for starting the uploaded code, or using the SRAM is just an option?

Posted 1 year ago #
ala42
Member

In libmaple\support\ld\maple_native\flash.ld remove the following lines
_lm_heap_start = 0x60000000;
_lm_heap_end = 0x60100000;
rebuild your binary and check again.

Also check how PG15 is used on your board, which is the button input used by the bootloader to stay in permanent boot mode. If this pin is free, try to pull it up or down during reset and check if that allows to start the program. Probably you have to pull it down.

Posted 1 year ago #
konan
Member

ala42, thanks you're right, I've just looked thoroughly at the Native schematics, and made the same conclusions. Besides PG15 (it must be linked to BOOT0, which must be connected to ground via 10k resistor), I also have to repeat the USB reset circuit, otherwise the PC will not detect changing from DFU to serial USB mode. About memory - yes, I commented out these lines, and also removed the FSMC initialisation from maple_native.cpp in the libmaple. Now everything works ok.

Posted 1 year ago #
ala42
Member

For the USB disconnect you could also use a 220Ohm resistor connected to the disconnect pin, use a 5V tolerant pin for this to be on the safe side. In this case you have to invert the signal polarity in the boot loader and libmaple code.

Posted 1 year ago #

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