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TM4C129XNCZAD: Profibus possible? + Issue with SD-Card driver

Part Number: TM4C129XNCZAD
Other Parts Discussed in Thread: PROFIBUS

Hello,

i am using a TM4C129XNCZAD on a custom ASIC. I have already implemented some peripherals:

internal EEPROM,  I/Os, Timer, UART, CAN, LCD Display with Touch, external SDRAM, and SD-Card.

Now i have a few questions:

1. Is it possible to implement a PROFIBUS Stack? If yes, where to get it? Is a RTOS necessary for that?

2. My SD-Card Driver works fast with Class4 Cards, however it works very slow with higher classes. Is there an updated SD-Card Driver available?

Thank you very much.