Question about XTAG4 and XU208

[denny10079]

Hi Seniors,

This is my first time with XMOS.
I have an XU208 board purchased from DIYINHK. Here is the link: https://www.diyinhk.com/shop/audio-kits ... ocket-null.

Currently, I have a simple project that I would like to flash onto the board using an XTAG4(with XSYS2).

I located the XSYS interface on the XU208 board and followed the “JTAG-only XSYS header” connection as described in the XU208 datasheet (screenshot below):

After connecting, I checked with the XTC tool and got the following information:


However, I'm confused about why the XTAG cannot detect the XU208 device. I have already powered the board with 3.3V.
Did I miss something? Should I instead use the “Full XSYS header”?

[Joe]

Looks like that board is designed for xtag3, not xtag4.

They have different interface connectors and pinouts. XTAG3 uses XSYS interface (20 pin 0.1" pitch 2x10 board to board header). XTAG4 uses XSYS2 interface (20 pin 0.05" pitch 2x10 header to cable). Pinout is also different.

Cheers,
Joe

[denny10079]

Yes, the problem was due to the different pin definitions between XSYS and XSYS2.
I was finally able to download the program into the XU208.
I have also ordered the XK-EVK-XU316, and I hope it will work well with the XTAG4.

[Ross]

The EVK has a "built-in" XTAG so you won't need to worry about that.

[denny10079]

Thanks. While waiting for the EVK to arrive, I have been testing the XU208 with a simple sample code.
The code is shown below.

Code: Select all

#include <platform.h>
#include <syscall.h>
#include <print.h>

port out p_leds = PORT_LEDS;

int main() {
    printstrln("Hello World!");

    if (!_is_simulation()) {
        // If running on hardware, flash the LEDs
        while (1) {
            p_leds <: 0x0;
            delay_milliseconds(100);
            p_leds <: 0xf;
            delay_milliseconds(100);
        }
    }

    return 0;
}

I noticed a strange output every 5 seconds — the output stays high for about 250ms.
Could this be a watchdog event?


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