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kpainter's avatar
kpainter
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11 months ago

Nios 2 uart initialization problem

I am using Quartus Lite 22.1.2. I am using the lightweight uart core. It is initialized by the alt_sys_init function and declares an object called uart_0. My problem is this object seems to be get...
Nios Cpu
  • kpainter's avatar
    kpainter
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    11 months ago

    Thank you for the quick answer. I had wondered about that so we tried the avalon uart and the same thing happens. Let me explain what we are trying to do and maybe there is a better way. We are trying to use this embedded console found here:
    https://github.com/bradschl/embedded-c-debug-console

    We have a getc function defined as below:

    int console_getc(void * console_hint)
    {
    (void) console_hint;
    int ret = ECDC_GETC_EOF;

    if (uart_0.rx_start != uart_0.rx_end)
    {
    ret = intel_lw_uart_read(&uart_0, xferbuf, 1, 0x4000);
    ret = xferbuf[0];
    }
    return ret;
    }
    Here is where the uart_0 is not recognized as it is being removed. This is happening with the avalon uart as well as I mentioned. I can see that the uart_0 struct is being filled with received characters from the isr but I am not able to get them out. Perhaps there is a better method of doing what I am attempting? Thank you for the assistance!
    Regards,
    Kelly Painter