NRFJPROG_rtt_write in nrf52_nrfjprog.dll won't write more than 15 characters

[CurtisHx]

I'm trying to pass a string longer than 15 characters to NRFJPROG_rtt_write (it's 17 characters, including null-termination), but the data_written parameter is set to 15 after the call. In addition, only 15 characters get sent down to the nRF52. I check that with the debugger. There's only 15 characters in the receive buffer on my target device.

[Jui-Chou (Rick) Chung]

Hello CurtisHx,

The length of the buffer which directs from terminal to the device can be configured in the 'SEGGER_RTT_Conf.h', which located in 'nRF5_SDK_11/external/segger_rtt/'

In the header file, you can find :

#define BUFFER_SIZE_DOWN                          (16)    // Size of the buffer for terminal input to target from host (Usually keyboard input) (Default: 16)

Update the the 'BUFFER_SIZE_DOWN' can increase the buffer length which may solve the problem.

[CurtisHx]

There it is. Do you know why the J-Link RTT Viewer was able to send more than 15 characters at a time? I was initially using the RTT Viewer, and I was able to send strings much longer than 15 characters.