Disabling UART on Due?

Hardware Arduino Due
18

I have found what i was looking for:

USART2->US_CR = US_CR_TXEN;//Enables USART2 TX
USART2->US_CR = US_CR_RXEN;//Enables USART2 RX
USART2->US_CR = US_CR_TXDIS;//Disables USART2 TX
USART2->US_CR = US_CR_RXDIS;//Disables USART2 RX

But now i find that if i have set the pins as digital previously like this:

pinMode(16, OUTPUT);
pinMode(17, INPUT);

the USART2 wont start, and will stay in LOW status, and therefor, not read anything.

Any clues on how to solve that?

I already tried the

g_APinDescription[pin].pPort -> PIO_PER = g_APinDescription[pin].ulPin;  (pin is digital io)
g_APinDescription[pin].pPort -> PIO_PDR = g_APinDescription[pin].ulPin;  (pin is peripheral)

and it didnt do the job.

BR