https://devzone.nordicsemi.com/f/nordic-q-a/97731/initialize-uart1-fail-on-52840-sdk17Hi, I want to use 2 UART(not need DMA) interface on my project. I know that SDK17 remove serial_uart example. So I call nrf_drv_uart_init() directly to use 2 UARTs. My main function call initialize UART0 then initialize UART1. Initialize UART0 isen-USTelligent Community 13Thu, 16 Mar 2023 11:44:21 GMThttps://devzone.nordicsemi.com/thread/415677?ContentTypeID=1Thu, 16 Mar 2023 11:44:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2e1eb61e-bad6-4d69-9568-583035126772Sigurd<p>Hi,</p> <p>Try setting&nbsp;UART_EASY_DMA_SUPPORT to 1 (in sdk_config.h)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/415612?ContentTypeID=1Thu, 16 Mar 2023 08:02:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9fefb07c-34d3-487d-aef3-f7a4f37727d8JohnCC<p>Hi Sigurd,</p> <p>&nbsp; &nbsp;</p> <p>&nbsp; &nbsp; &nbsp; &nbsp;I change&nbsp;<span>UART_LEGACY_SUPPORT&nbsp;to 0. But get some build error.</span></p> <p><span>Error[Pe020]: identifier &quot;nrf_uarte_baudrate_t&quot; is undefined C:\Users\jj\Desktop\M2\integration\nrfx\legacy\nrf_drv_uart.h 122 <br />Error[Pe020]: identifier &quot;nrf_uarte_error_mask_t&quot; is undefined C:\Users\jj\Desktop\M2\integration\nrfx\legacy\nrf_drv_uart.h 127 <br />Error[Pe020]: identifier &quot;nrf_uarte_hwfc_t&quot; is undefined C:\Users\jj\Desktop\M2\integration\nrfx\legacy\nrf_drv_uart.h 130 <br />Error[Pe020]: identifier &quot;nrf_uarte_parity_t&quot; is undefined C:\Users\jj\Desktop\M2\integration\nrfx\legacy\nrf_drv_uart.h 133 <br />Error[Pe020]: identifier &quot;nrf_uarte_task_t&quot; is undefined C:\Users\jj\Desktop\M2\integration\nrfx\legacy\nrf_drv_uart.h 134 <br />Error[Pe020]: identifier &quot;nrf_uarte_event_t&quot; is undefined C:\Users\jj\Desktop\M2\integration\nrfx\legacy\nrf_drv_uart.h 135 <br />Error while running C/C++ Compiler <br />nrf_fprintf_format.c <br />nrf_log_backend_rtt.c <br />nrf_log_backend_serial.c <br />nrf_log_default_backends.c <br />uart_driver.c <br />Error[Pe020]: identifier &quot;nrf_uarte_baudrate_t&quot; is undefined C:\Users\jj\Desktop\M2\integration\nrfx\legacy\nrf_drv_uart.h 122 <br />Error[Pe020]: identifier &quot;nrf_uarte_error_mask_t&quot; is undefined C:\Users\jj\Desktop\M2\integration\nrfx\legacy\nrf_drv_uart.h 127 <br />Error[Pe020]: identifier &quot;nrf_uarte_hwfc_t&quot; is undefined C:\Users\jj\Desktop\M2\integration\nrfx\legacy\nrf_drv_uart.h 130 <br />Error[Pe020]: identifier &quot;nrf_uarte_parity_t&quot; is undefined C:\Users\jj\Desktop\M2\integration\nrfx\legacy\nrf_drv_uart.h 133 <br />Error[Pe020]: identifier &quot;nrf_uarte_task_t&quot; is undefined C:\Users\jj\Desktop\M2\integration\nrfx\legacy\nrf_drv_uart.h 134 <br />Error[Pe020]: identifier &quot;nrf_uarte_event_t&quot; is undefined C:\Users\jj\Desktop\M2\integration\nrfx\legacy\nrf_drv_uart.h 135 <br />Error[Pe020]: identifier &quot;NRF_UARTE_PSEL_DISCONNECTED&quot; is undefined C:\Users\jj\Desktop\M2\codebase\bsp\uart\uart_driver.c 14 <br />Error[Pe020]: identifier &quot;NRF_UARTE_PARITY_EXCLUDED&quot; is undefined C:\Users\jj\Desktop\M2\codebase\bsp\uart\uart_driver.c 19 <br />Error while running C/C++ Compiler </span></p> <p><span>Thank you</span></p> <p><span></span></p> <p><span>John.</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/415432?ContentTypeID=1Wed, 15 Mar 2023 12:00:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:558f31c5-39f4-47e3-b770-cafb30cf6989Sigurd<p>Hi,</p> <p>Please try to set&nbsp;UART_LEGACY_SUPPORT to 0</p><div style="clear:both;"></div>