UART nrf52840

[Gourav]

hello,

    I need example code on uart with hardware flow control disabled and on UARTE. with different clock source.

Regards, 

Gourav

[Einar Thorsrud]

Hi,

The UART Example demonstrates this, using the UART driver (I don't know why you mean by "different clock source", though).

[Gourav]

Hi Einar,

           I have gone through uart example, I couldnt find clock initialization...{by different clock source i mean  "external clock" }

[Einar Thorsrud]

Hi,

There is no support for using an external clock with UART. The UART peripheral uses the internal HF clock, which comes from either the HFRC or HFXO oscillator (if explicitly started).

[Gourav]

Hi Einar,

         The  UART Example  states use of both UART0 and UARTE with APP_UART_FLOW_CONTROL_DISABLED, is it possible to use only UART0 with hardware flow control and easy DMA disabled in the example.

[Einar Thorsrud]

The UARTE peripheral always use DMA, but the legacy UART peripheral does not use DMA. So if you don't want to use DMA, then you should use the UART peripheral. Set the following config parameters in the projects sdk_config.h to 0 to disable DMA and flow control:

• UART_EASY_DMA_SUPPORT
• UART0_CONFIG_USE_EASY_DMA
• NRFX_UARTE_DEFAULT_CONFIG_HWFC (the SDK example does not use this, but rather sets UART_HWFC and use that - see <SDK>\examples\peripheral\uart\main.c)