Win32 Flashing Teensy 2.0 / Teensy 3.2 / Teensy LC

[rjonkman]

I'm having issues getting the the loader to work reliably for all these various controllers on Win 32. The following changes implemented by josh3io seem to work, but they look like a bit of a hack and result in very slow uploading:

https://github.com/josh3io/teensy_cli_loader_win32

Paul, the Teensy.exe app works flawlessly for all the these chips. Would it be possible for you to post the write_usb_device() and teensy_write() methods that you use in the Teensy.exe program. If you were willing to, I'd update the teensy_loader_cli methods and test them to resolve the current issues on Windows.

Regards, Rob

[rjonkman]

I think I found a good solution by modifying write_usb_device()

int waited = 0;
    while (!GetOverlappedResult(h, &ov, &n, FALSE) || n <= 0) {
        Sleep(1);
        waited++;
        if (waited > timeout) return 0;
    }

    return 1;

[rjonkman]

...Doesn't work... It times out...

[rjonkman]

This seems to be working...

int teensy_write(void *buf, int len, double timeout)
{

    if (!win32_teensy_handle) return 0;

    int waited = 0;

    while (waited < timeout * 1000) {

        if (write_usb_device(win32_teensy_handle, buf, len, (int)(timeout * 1000.0))) return 1;

        Sleep(10);
        waited += 10;

    }
    return 0;
}

int write_usb_device(HANDLE h, void *buf, int len, int timeout) {
    static HANDLE event = NULL;
    unsigned char tmpbuf[1089];
    OVERLAPPED ov;
    DWORD n, r;

    if (len > sizeof(tmpbuf)-1) return 0;

    if (event == NULL) {
        event = CreateEvent(NULL, TRUE, TRUE, NULL);
        if (!event) return 0;
    }

    ResetEvent(&event);
    memset(&ov, 0, sizeof(ov));
    ov.hEvent = event;
    tmpbuf[0] = 0;
    memcpy(tmpbuf + 1, buf, len);
    bool res;

    res = WriteFile(h, tmpbuf, len + 1, NULL, &ov);

    if (!res) {
        if (GetLastError() != ERROR_IO_PENDING) return 0;
    }

    res = GetOverlappedResult(h, &ov, &n, TRUE);

    if (!res) return 0;

    return 1;
}

[PaulStoffregen]

Fixed https://github.com/PaulStoffregen/teensy_loader_cli/commit/0416adf3d250bf1d82913be514aaa51cb1d5f098