how to reduce power consumption about UART

[MrFine]

I modify nrf51 nus in SDK12.3.0 to realize my application, I found when enable uart, the consumption near 830uA , and then call app_uart_close(), the consumption near 5uA;
so I want a pio to control the uart enable when I want use uart,and disable when I don`t use uart; I change a button event in bsp, so if the button pressed, then enable uart, else disable uart. it can work normally,but the consumption is 230uA when disable and 1mA when enable uart; I want the consumption is near 5uA when disable, so how can I change my code or any other method to realise it? Thans for your help!!

[Stian Røed Hafskjold]

Can you please post the code showing how you initialize the bsp button? Did you configure it with a pull-up/down? 230µA sounds to me like current is going through a pull resistor on the button GPIO.