#include <dwc_otg_hcd.h>
Public Member Functions | |
| DWC_CIRCLEQ_ENTRY (dwc_otg_qtd) qtd_list_entry | |
| This list of QTDs. | |
Data Fields | |
| uint8_t | data_toggle |
| Determines the PID of the next data packet for the data phase of control transfers. | |
| dwc_otg_control_phase_e | control_phase |
| Current phase for control transfers (Setup, Data, or Status). | |
| uint8_t | complete_split |
| Keep track of the current split type for FS/LS endpoints on a HS Hub. | |
| uint32_t | ssplit_out_xfer_count |
| How many bytes transferred during SSPLIT OUT. | |
| uint8_t | error_count |
| Holds the number of bus errors that have occurred for a transaction within this transfer. | |
| uint16_t | isoc_frame_index |
| Index of the next frame descriptor for an isochronous transfer. | |
| uint8_t | isoc_split_pos |
| Position of the ISOC split on full/low speed. | |
| uint16_t | isoc_split_offset |
| Position of the ISOC split in the buffer for the current frame. | |
| dwc_otg_hcd_urb * | urb |
| URB for this transfer. | |
| dwc_otg_qh * | qh |
| uint8_t | in_process |
| Indicates if this QTD is currently processed by HW. | |
| uint8_t | n_desc |
| Number of DMA descriptors for this QTD. | |
| uint16_t | isoc_frame_index_last |
| Last activated frame(packet) index. | |
A single QTD is created for each URB (of one of these types) submitted to the HCD. The transfer associated with a QTD may require one or multiple transactions.
A QTD is linked to a Queue Head, which is entered in either the non-periodic or periodic schedule for execution. When a QTD is chosen for execution, some or all of its transactions may be executed. After execution, the state of the QTD is updated. The QTD may be retired if all its transactions are complete or if an error occurred. Otherwise, it remains in the schedule so more transactions can be executed later.
Definition at line 191 of file dwc_otg_hcd.h.
| uint8_t dwc_otg_qtd::data_toggle |
Determines the PID of the next data packet for the data phase of control transfers.
Ignored for other transfer types.
One of the following values:
Definition at line 199 of file dwc_otg_hcd.h.
| uint16_t dwc_otg_qtd::isoc_frame_index |
Index of the next frame descriptor for an isochronous transfer.
A frame descriptor describes the buffer position and length of the data to be transferred in the next scheduled (micro)frame of an isochronous transfer. It also holds status for that transaction. The frame index starts at 0.
Definition at line 224 of file dwc_otg_hcd.h.
| uint16_t dwc_otg_qtd::isoc_frame_index_last |
Last activated frame(packet) index.
Used in Descriptor DMA mode only.
Definition at line 250 of file dwc_otg_hcd.h.
1.4.7