STM32F042K6 USB HID Library Size Problem

[MSMorkan_R]

Hi,

I have created a CubeMx project for STM32F042K6. I am using following components:

• USB
• TSC
• IWDG
• GPIO
• TOUCHSENSING
• USB_DEVICE

I just defined the pins and tried to compile but compiler says FLASH overflows around 2.5K

I didn't even write one line of code. Then I realized USB HID library takes a lot of space (around 21K) on the FLASH.

How can I reduce this size? Is there anyway to use it as Keyboard+Mouse without using entire library? Or is there any 'Lite' libray for USB HID?

Thanks

[Vangelis Fortounas · Accepted solution]

Hello

Change compiler optimizations for smaller code.

[MSMorkan_R]

Thanks! It solved the problem. Code size reduced to half (around 16K). Does this method has any side effects?

[Vangelis Fortounas]

hello

When reduce size , depending on the code, results varies. May observed slower execution.