AST_UDC_DESCS_COUNT
if (AST_UDC_DESCS_COUNT == 256) {
#define AST_UDC_EP_DMA_SIZE (AST_UDC_EPn_MAX_PACKET + 8 * AST_UDC_DESCS_COUNT)
while (chunk >= 0 && !last && count < AST_UDC_DESCS_COUNT) {
if (ep->descs_wptr >= AST_UDC_DESCS_COUNT)
descs_max_size = AST_EP_DMA_DESC_MAX_LEN * AST_UDC_DESCS_COUNT;
if (i >= AST_UDC_DESCS_COUNT)