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PHJ's avatar
PHJ
Icon for Occasional Contributor rankOccasional Contributor
7 years ago
Solved

Arria 10 SoC DevKit: Can I drive DB-9 RS-232 port from HPS UART0 ?

The user guide indicates that this is available after FPGA configuration. What needs to be configured for this to work ? ​Does the GSRD support this ?
  • PHJ's avatar
    PHJ
    7 years ago

    ​Hi,

    I now have the HPS UART0 routed through the FPGA OK to the DB9 RS-232 port.

    The UART_RS232 soft IP is not required in the FPGA.

    My problem here was caused by the RS-232 PHY on the dev board operating in an auto-shutdown mode that meant that the external tx/rx loopback test I was attempting would never wake the PHY.

    Thanks,

    Paul

GSagl1's avatar
GSagl1
Icon for New Contributor rankNew Contributor
6 years ago

Hi,

How did you do this? What is FPGA OK? I have a design in my FPGA and I'm not using the HPS at all, and I want to use UART to send data to the design in the FPGA. Is this what you also did, and How?

I hope you can help me understand what's going on,

Gurol

PHJ's avatar
PHJ
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

​Hi Gurol -

We configured the pinmux in the HPS to route UART0 via the FPGA:

/* UART0 routed via FPGA */

alt_write_word(ALT_PINMUX_FPGA_UART0_USEFPGA_ADDR, ALT_PINMUX_FPGA_UART0_USEFPGA_SEL_SET(1));

We configured the FPGA to route the HPS UART0 signals to the appropriate input/output pins of the A10 - we only used tx/rx as we were not using flow control.

Best Regards,

Paul

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