smartcard application transform stmf4 series to stmf7 series

[D.eknc]

Hi, I have an application on STM32F4 MCU which is based on Smartcard T =1 protocol according to ISO 7816. The app works very well. Then I choose other STM32F7 board to test this application, i faced with problems, i can read ATR from SmartCard but i cannot make any PPS change operation, so i cannot send ANY APDU's to card.

According to AN4800 SmartCard Interface Application Note, when using STM32F4 series almost everything done with software. However it changed on STM32F7series. For example new timeout feature added for BWT and CWT.

So, is there a simple way to transform my app to STMF7series or what can i do to solve this problem?

Addition:

USART2 used. CLK freq 4.5MHz on both boards , i get ATR on both sides.

Thanks for any advice.

Best Regards

Derya.