UART communication FIFO error

[yokokawa]

OS in development environment ：Windows7
HARD :(Taiyo Yuden)EBSHSN Series Evaluation Board : Central / Peripherals
CPU :(Nordic) nRF52832 / ARMR Cortex-M4F 32 bit processor 28-pin Land Grid Array / 15GPIOs / SWD
Soft Ver:nRF5_SDK_15.3.0_59ac345

Because a UART FIFO error has occurred in the device currently under development,
Confirmed the operation of the sample program.
We communicated with the sample program of ble_app_uart_c and ble_app_uart.
result:
If 2kbyte data is transmitted continuously, a FIFO error will occur regardless of whether or not flow control is performed with the UART.
Please tell me how to take measures.

[Nguyen Hoan Hoang]

On the UART side,  app_uart is not recommended for your test.  nrfx_uart works better.  IOsonata library is much better https://github.com/IOsonata/IOsonata/blob/master/ARM/Nordic/src/uart_nrf5x.cpp

here are comparisons : tests performed on PCA10040.  nRF52 UART  Tx to PC (python Rx) via jlink uart bridge  

app_uart C only drops a lot: ~ 69965 Bytes/s

nrfx_uart C only with DMA better : 75753 Bytes/s, no drop

IOSonata C++ object oriented UART no DMA : 86607 Bytes/s 

IOsonata C++ object oriented with DMA : 100000 Bytes/s.  Few drops via jlink. No drop via IDAP-Link or FTDI. 

[yokokawa]

Is there a sample program that uses "nrfx_uart.C"?

Please introduce the sample program.

[Nguyen Hoan Hoang]

here https://github.com/IOsonata/IOsonata/blob/master/ARM/Nordic/exemples/UartSdkPrbsTx.c

[yokokawa]

Thank you very much. The contents of “UartSdkPrbsTx.c” were confirmed.
The sending method was listed, but the receiving method was not listed.
Is there a sample program that can be used as a reference for UARTE reception?

[Nguyen Hoan Hoang]

https://github.com/IOsonata/IOsonata/tree/master/Python

on PC.  modify the code to select your COM port.  Require python3

[yokokawa]

1) How do I set the UART reception interrupt when using “nrfx_uarte.c”?
2) Please let me know the maximum value of “size_tlength” of “nrfx_uarte_tx ()” and “nrfx_uarte_tx ()”.