stmhal: Allow sending CAN messages with timeout=0.

Thanks to Henrik Sölver for this patch.

1 files changed, 7 insertions, 1 deletions

diff --git a/docs/library/pyb.CAN.rst b/docs/library/pyb.CAN.rst
index 8f417f735..46e6d08cf 100644
--- a/docs/library/pyb.CAN.rst
+++ b/docs/library/pyb.CAN.rst
@@ -126,7 +126,7 @@ Methods
 
    Return value: buffer of data bytes.
 
-.. method:: can.send(send, addr, \*, timeout=5000)
+.. method:: can.send(send, addr, \*, timeout=0)
 
    Send a message on the bus:
 
@@ -134,6 +134,12 @@ Methods
      - ``addr`` is the address to send to
      - ``timeout`` is the timeout in milliseconds to wait for the send.
 
+     If timeout is 0 the message is placed in a buffer in one of three hardware
+     buffers and the method returns immediately. If all three buffers are in use
+     an exception is thrown. If timeout is not 0, the method waits until the
+     message is transmitted. If the message can't be transmitted within the
+     specified time an exception is thrown.
+
    Return value: ``None``.
 
 .. method:: can.rxcallback(fifo, fun)