Finish low level parts of the simple receiver code
It does the same motor test code still, but it's ready for real code to
be used instead.
Change-Id: Ie74f0b29f40ff25402adf7cbac0283262bd8f07c
diff --git a/motors/peripheral/can.h b/motors/peripheral/can.h
index 98083c9..061fa05 100644
--- a/motors/peripheral/can.h
+++ b/motors/peripheral/can.h
@@ -14,7 +14,7 @@
void can_init(uint32_t id0, uint32_t id1);
-// Mailbox is 2 or 3 for the two send mailboxes.
+// Mailbox is 2-7 (inclusive) for the send mailboxes.
int can_send(uint32_t can_id, const unsigned char *data, unsigned int length,
unsigned int mailbox);