The nRF51822 has only 1 UART hardware peripheral. You can do the bit banging to have more but I don't think it's the case here. You can refer to the nRF51 Reference Manual for more information about the nRF51822.
Regarding the GPIO, the nRF51822 has the Pin Crossbar feature that you can chose and connect any GPIO pins as UART's (or SPI/TWI etc) pins. And you can change these pins in runtime. Which means, if you don't need 2 UARTs running concurrently, you can use 1 UART and switch between the pins to interface with 2 devices.
The nRF51822 has only 1 UART hardware peripheral. You can do the bit banging to have more but I don't think it's the case here. You can refer to the nRF51 Reference Manual for more information about the nRF51822.
Regarding the GPIO, the nRF51822 has the Pin Crossbar feature that you can chose and connect any GPIO pins as UART's (or SPI/TWI etc) pins. And you can change these pins in runtime. Which means, if you don't need 2 UARTs running concurrently, you can use 1 UART and switch between the pins to interface with 2 devices.
