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canio: Give implementation-specific limits for CAN.Listen

This commit is contained in:
Jeff Epler 2020-10-26 10:06:49 -05:00
parent bdc1343791
commit c9f7df3bab
1 changed files with 18 additions and 1 deletions
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19
shared-bindings/canio/CAN.c
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@ -214,7 +214,24 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_1(canio_can_restart_obj, canio_can_restart);
//|
//| An empty filter list causes all messages to be accepted.
//|
//| Timeout dictates how long receive() and next() will block."""
//| Timeout dictates how long receive() and next() will block.
//|
//| Platform specific notes:
//|
//| SAM E5x supports two Listeners. Filter blocks are shared between the two
//| listeners. There are 4 standard filter blocks and 4 extended filter blocks.
//| Each block can either match 2 single addresses or a mask of addresses.
//| The number of filter blocks can be increased, up to a hardware maximum, by
//| rebuilding CircuitPython, but this decreases the CircuitPython free
//| memory even if canio is not used.
//|
//| STM32F405 supports two Listeners. Filter blocks are shared between the two listeners.
//| There are 14 filter blocks. Each block can match 2 standard addresses with
//| mask or 1 extended address with mask.
//|
//| ESP32S2 supports one Listener. There is a single filter block, which can either match a
//| standard address with mask or an extended address with mask.
//| """
//| ...
//|
STATIC mp_obj_t canio_can_listen(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {