TDA4AL-Q1: How to configure UART to use DMA for data transmission?

Hello Eddi,

The assigned engineer is on business travel this week, so please expect a delay in response on this thread.

Thank you,

AlanL

Hi Eddi,

Eddi Liu said:

Since there are some transmission issues

What are the transmission issues you are encountering?

Additionally, if you are using RTOS, please take a look at the UART example within the PDK on more information on using the UART peripheral as well as enabling DMA.

Thanks,

Neehar

Hi Neehar,

The transmission issue has been resolved earlier, but we may consider enabling DMA in the future. Currently, based on the source code, it seems that we need to add the dmas and dma-names parameters in the device tree.

However, since I am unsure how to fill in the parameters for dmas related to main_uart6 and main_uart7, could you please assist with providing detailed instructions on how to enable DMA for main_uart6 and main_uart7?

Also, our operating system is Linux and we are using Yocto interface.

Thanks.

Hi Eddi,

I currently do not have bandwidth and will follow up by the end of the week. Thank you for your patience!

Thanks,

Neehar

Hi Eddi,

Take a look at the configuration below as an example:

&main_uart1 {
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_uart1>;
    dmas = <&main_pktdma 0x4401 0>, <&main_pktdma 0xc401 0>;
    dma-names = "rx", "tx";
    status = "okay";
}

Thanks,

Neehar

Hi Neehar,

What values should be specified for the dmas property of main_uart6 and main_uart7 in the device tree?

Thanks,

Eddie