STM32f070F6 with CDC HAL libs?

Forum|Forum|8 years ago
May 10, 2018
4 replies
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Posted on May 10, 2018 at 16:32

Hi.

I'm trying to upgrade an existing PCB (so changing the MCU is not an option for now).

The MCU used so far is the STM32f070F6. The MCU has USB peripheral and I want to use this as VCOM.

When I generate the code with CubeMX and try to compile (with absolutely no code change), I get the message that the MCU do not have enough RAM: '/arm-none-eabi/bin/ld.exe: region` RAM 'overflowed by 1760 bytes'.

I have already changed the CDC buffers to a size of 40 bytes (maximum of what I want to transfer), but I still have a similar error.

Is there an example with this MCU in which the USB peripheral is used?

Thank you.

#cubemx #usbvcom #stm32f070f6 #stm32f070

This topic has been closed for replies.

Khouloud GARSI

Technical Moderator

Posted on May 10, 2018 at 17:54

Hi David,

There is an application under the

http://www.st.com/content/st_com/en/products/embedded-software/mcus-embedded-software/stm32-embedded-software/stm32cube-mcu-packages/stm32cubef0.html

package. It's titled 'CDC_Standalone' and could be found following the path below:

STM32Cube_FW_F0_V1.9.0\Projects\STM32072B_EVAL\Applications\USB_Device\CDC_Standalone

The example may help you to correctly configure your application. It shows how to use the STM32F0xx USB Device peripheral where the STM32 MCU behaves as a USB-to-RS232 bridge following the Virtual COM Port (VCP) implementation.

Khouloud.

David MartinsAuthor

Senior

Posted on May 11, 2018 at 16:52

Thank you

garsi.khouloud

I'm following this example, but the problem is that I can not compile at all.

I still have RAM overflow.

The project is here (

https://mega.nz/#F!ke5S0JoJ!tJqNLGDPO_OMfP3whwUPrg

).

As you can see, there is no modified code. It's a clean project, but apparently there is not enough RAM ...

arm-none-eabi-gcc -mcpu=cortex-m0 -mthumb -mfloat-abi=soft -specs=nosys.specs -specs=nano.specs -T'../STM32F070F6Px_FLASH.ld' -Wl,-Map=output.map -Wl,--gc-sections -o 'stm_vcom.elf' @'objects.list' -lm

c:/ac6/systemworkbench/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.0.201708311556/tools/compiler/bin/../lib/gcc/arm-none-eabi/6.3.1/../../../../arm-none-eabi/bin/ld.exe: stm_vcom.elf section`.bss' will not fit in region `RAM'

c:/ac6/systemworkbench/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.0.201708311556/tools/compiler/bin/../lib/gcc/arm-none-eabi/6.3.1/../../../../arm-none-eabi/bin/ld.exe:region `RAM' overflowed by 1632 bytes

collect2.exe: error: ld returned 1 exit status

make: *** [stm_vcom.elf] Error 1

makefile:37: recipe for target 'stm_vcom.elf' failed

Can you confirm, please?

Thank you.