Function usb_read

FluxEngine.cydsn/main.c:206–219

buffer must be big enough for a frame */

/* buffer must be big enough for a frame */
static int usb_read(int ep, uint8_t buffer[FRAME_SIZE])
{
    if (USBFS_GetEPState(ep) != USBFS_OUT_BUFFER_FULL)
    {
        USBFS_EnableOutEP(ep);
        wait_until_readable(ep);
    }

    int length = USBFS_GetEPCount(ep);
    USBFS_ReadOutEP(ep, buffer, length);
    while (USBFS_GetEPState(ep) != USBFS_OUT_BUFFER_EMPTY)
        ;
    return length;
}

static void cmd_get_version(struct any_frame* f)
{