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nrf52832 of uart_receive_size

i use the nrf52832,s uarte. using the app_uart_fifo.c document. but i can only receive the max 256 bytes.the configuration is belows:

APP_UART_FIFO_INIT(&comm_params, UART_RX_BUF_SIZE, UART_TX_BUF_SIZE, my_uart_event_handle, APP_IRQ_PRIORITY_LOWEST, err_code); APP_ERROR_CHECK(err_code); UART_RX_BUF_SIZE and UART_TX_BUF_SIZE is 1024.

but when receing bytes is bigger than 256,the overflow of bytes is gived up..

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