HI Carlos,
ring_buffer.c commonly exists in LPCOpen package. LPC51U68 is NXP new launched product (Lunch date: Jun 2018) which is supported by MCUXpresso SDK only. LPCOpen only support legacy product. There is no plan to support LPC51U68 in LPCOpen.
I suggest you refer MCUXpresso SDK demo code:
Welcome | MCUXpresso SDK Builder
There is interrupt_rb_transfer demo project included inside. it shows how to use uart driver in interrupt way with RX ring buffer enabled.
Have a great day,
Jun Zhang
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