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disable uart RX FIFO

i have project with nRf51822 and uart. i use uart fifo in Uart_app_ble example sdk11. now i need disable or enable Rx, TX.i tried this function :

NRF_UART0->TASKS_STARTRX = 1; NRF_UART0->TASKS_STARTTX = 1; and NRF_UART0->TASKS_STOPRX = 1; NRF_UART0->TASKS_STOPTX = 1;
but nothing happend. it only work when i don't use FIFO,but if i just config uart normal without fifo, event handle... i can't use function uart_event_handle to receive data or do something :(

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