On the ESP8266-12 with the NONOS-SDK-2.2.0, every char I send on the RX pin of the UART0 is reprinted/echoed on the TX pin.
How to disable this annoying echo ?
(I suspected the "loopback" feature to be enabled by default, but clearing bit 14 of UART_CONF0(0) didn't help: SET_PERI_REG_MASK(UART_CONF0(0), UART_LOOPBACK); )
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