UART information needed.

[kallisti5]

The BCM2835 manual notes a UART0 and a UART1.

From what I can gather, UART0 is the full PL011, and UART1 is the "miniUART" that is supposed to be simpler.

Questions:

• There is only one set of assigned tx and rx pins on the pi / bcm2835... how do you switch the pins between the two uarts?
• I see references to UART0 needs to have gpio 14 and gpio 15 in alt0 mode, is this the change needed to go from miniUART -> full PL011 mode?
• The BCM2835 pdf shows that the gpio 14 and 15 pins need to be "low", is this true?

What I really need is a high level overview of what steps are needed to get a uart to the state needed to output characters.

[cleverca22]

don't have any docs, but i suspect uart0 and uart1 use separate tx and rx pins

and i know that one of them is enabled at bootup, the rx/tx on the GPIO header are fully working as /dev/ttyAMA0 under linux

edit:
http://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf page 102 (section 6.2)

the table lists every pin that rx/tx 0 and rx/tx 1 can be routed to, goes to a lot more pins then i was expecting

[Ruffio]

Is this issue still relevant or can it be closed?

[popcornmix]

See: raspberrypi/linux#1008