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usb_canbus: Initial support for USB to CAN bridge mode

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Support a USB interface that shows up as a canbus adapter to linux.
Route both local and real canbus packets over that interface.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2022-06-08 21:03:11 -04:00
parent c8cc98ce5d
commit 790ff4d8d7
8 changed files with 782 additions and 15 deletions
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7
src/generic/canserial.c
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@@ -224,7 +224,7 @@ canserial_notify_rx(void)
DECL_CONSTANT("RECEIVE_WINDOW", ARRAY_SIZE(CanData.receive_buf));
// Handle incoming data (called from IRQ handler)
void
int
canserial_process_data(struct canbus_msg *msg)
{
uint32_t id = msg->id;
@@ -233,7 +233,7 @@ canserial_process_data(struct canbus_msg *msg)
int rpos = CanData.receive_pos;
uint32_t len = CANMSG_DATA_LEN(msg);
if (len > sizeof(CanData.receive_buf) - rpos)
len = sizeof(CanData.receive_buf) - rpos;
return -1;
memcpy(&CanData.receive_buf[rpos], msg->data, len);
CanData.receive_pos = rpos + len;
canserial_notify_rx();
@@ -243,12 +243,13 @@ canserial_process_data(struct canbus_msg *msg)
uint32_t pushp = CanData.admin_push_pos;
if (pushp >= CanData.admin_pull_pos + ARRAY_SIZE(CanData.admin_queue))
// No space - drop message
return;
return -1;
uint32_t pos = pushp % ARRAY_SIZE(CanData.admin_queue);
memcpy(&CanData.admin_queue[pos], msg, sizeof(*msg));
CanData.admin_push_pos = pushp + 1;
canserial_notify_rx();
}
return 0;
}
// Remove from the receive buffer the given number of bytes