EHCI_QTD_NBUFFERS
while (++x < EHCI_QTD_NBUFFERS) {
#define EHCI_QTD_PAYLOAD_MAX ((EHCI_QTD_NBUFFERS-1)*EHCI_PAGE_SIZE)
volatile uint32_t qtd_buffer[EHCI_QTD_NBUFFERS];
volatile uint32_t qtd_buffer_hi[EHCI_QTD_NBUFFERS];
volatile uint32_t qtd_buffer[EHCI_QTD_NBUFFERS];
volatile uint32_t qtd_buffer_hi[EHCI_QTD_NBUFFERS];