Communication between Raspberry pi and LPC1768

So what have you tried so far?

Where are you stuck?

Have you looked at X/Y/Z-MODEM ?

https://www.avrfreaks.net/forum/xmodem-question

Remember that a UART neither knows nor cares what it's connected to - all that matters is that it has the right signal levels, and is at the right baud rate (and parity, number of data bits, number of stop bits, etc):

https://www.avrfreaks.net/comment/3105751#comment-3105751

So what have you tried so far?

Where are you stuck?

Have you looked at X/Y/Z-MODEM ?

https://www.avrfreaks.net/forum/xmodem-question

Remember that a UART neither knows nor cares what it's connected to - all that matters is that it has the right signal levels, and is at the right baud rate (and parity, number of data bits, number of stop bits, etc):

https://www.avrfreaks.net/comment/3105751#comment-3105751