https://devzone.nordicsemi.com/f/nordic-q-a/59787/uart-1-cannot-initHi nrf52833 SDK16 The following code works fine on UART 0 but not on UART 1 The problem seems to come from nrfx_uart.c There is no support for a UART1, so nrf_prs_acquire() will fail on the Also nrf_uart.c lacks support for uart 1en-USTelligent Community 13Wed, 01 Apr 2020 18:42:32 GMThttps://devzone.nordicsemi.com/thread/243042?ContentTypeID=1Wed, 01 Apr 2020 18:42:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:297b44a3-0966-40d5-b121-1d492d657b10J&#248;rgen Holmefjord<p>Hi,</p> <p>There is no legacy UART for instance 1 (<a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/uart.html#topic">UART1</a>), only UART0 support legacy UART. In order to use the second UART instance, you need to use <a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/uarte.html#topic">UARTE1</a>, UART with EasyDMA support.</p> <p>You can either use nrfx_uarte, or it should also be possible to use the legacy UART driver (nrf_drv_uart) if it is configured correctly. If you do not need both legacy and EasyDMA support, you can disable to PRS for UART (set NRFX_PRS_BOX_4_ENABLED to 0 in sdk_config.h), and then remove legacy UART driver from the project (nrfx_uart.c) and disable legacy support in legacy UART driver in sdk_config.h by setting UART_LEGACY_SUPPORT to 0.</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>