FS_USB_PKT_SIZE
dev->burst_cap = FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
buf = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
#define DEFAULT_FS_BURST_CAP_SIZE (6 * 1024 + 33 * FS_USB_PKT_SIZE)
#define DEFAULT_FS_BURST_CAP_SIZE (6 * 1024 + 33 * FS_USB_PKT_SIZE)
burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;