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more comments in host_communication.c.

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Change-Id: I8b0124ec96b56b7c89e4c7033a11cc93c4fa2d26
This commit is contained in:
Harald Welte
2019-12-14 18:58:58 +01:00
parent 342a7fe039
commit 271be9d181
1 changed files with 5 additions and 2 deletions
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7
firmware/libcommon/source/host_communication.c
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@@ -27,7 +27,7 @@
* USBD Integration API * USBD Integration API
***********************************************************************/ ***********************************************************************/
/* call-back after (successful?) transfer of a buffer */ /* call-back after (successful?) transfer of a write buffer on IN EP */
static void usb_write_cb(uint8_t *arg, uint8_t status, uint32_t transferred, static void usb_write_cb(uint8_t *arg, uint8_t status, uint32_t transferred,
uint32_t remaining) uint32_t remaining)
{ {
@@ -48,6 +48,7 @@ static void usb_write_cb(uint8_t *arg, uint8_t status, uint32_t transferred,
usb_buf_free(msg); usb_buf_free(msg);
} }
/* check if the spcified IN endpoint is idle and submit the next buffer from queue */
int usb_refill_to_host(uint8_t ep) int usb_refill_to_host(uint8_t ep)
{ {
struct usb_buffered_ep *bep = usb_get_buf_ep(ep); struct usb_buffered_ep *bep = usb_get_buf_ep(ep);
@@ -99,7 +100,7 @@ int usb_refill_to_host(uint8_t ep)
return 1; return 1;
} }
/* call-back after (successful?) transfer of a buffer */ /* call-back after (successful?) read transfer of a buffer on OUT EP */
static void usb_read_cb(uint8_t *arg, uint8_t status, uint32_t transferred, static void usb_read_cb(uint8_t *arg, uint8_t status, uint32_t transferred,
uint32_t remaining) uint32_t remaining)
{ {
@@ -120,6 +121,7 @@ static void usb_read_cb(uint8_t *arg, uint8_t status, uint32_t transferred,
llist_add_tail_irqsafe(&msg->list, &bep->queue); llist_add_tail_irqsafe(&msg->list, &bep->queue);
} }
/* refill the read queue for data received from host PC on OUT EP, if needed */
int usb_refill_from_host(uint8_t ep) int usb_refill_from_host(uint8_t ep)
{ {
struct usb_buffered_ep *bep = usb_get_buf_ep(ep); struct usb_buffered_ep *bep = usb_get_buf_ep(ep);
@@ -158,6 +160,7 @@ int usb_refill_from_host(uint8_t ep)
return 1; return 1;
} }
/* drain any buffers from the queue of the endpoint and release their memory */
int usb_drain_queue(uint8_t ep) int usb_drain_queue(uint8_t ep)
{ {
struct usb_buffered_ep *bep = usb_get_buf_ep(ep); struct usb_buffered_ep *bep = usb_get_buf_ep(ep);