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UART SDK12 NRF_LOG_GETCHAR() does not work

When I use NRF_LOG_GETCHAR() witn nRF52 DK and onboard SEGGER UART it stops in next NRF_LOG_INFO(). Also after ARM reset it keeps in this error state. It seems that SEGGER does not correctly drive CTS pin.

Also it is strange that when I disable UART flow control setting:

#define NRF_LOG_BACKEND_SERIAL_UART_FLOW_CONTROL 0

Then NRF_LOG_GETCHAR() does not work. But at least NRF_LOG_INFO() works after ARM reset.

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