_canio: Minimal implementation for SAM E5x MCUs

Tested & working:

 * Send standard packets
 * Receive standard packets (1 FIFO, no filter)

Interoperation between SAM E54 Xplained running this tree and
MicroPython running on STM32F405 Feather with an external
transceiver was also tested.

Many other aspects of a full implementation are not yet present,
such as error detection and recovery.

1 files changed, 8 insertions, 0 deletions

diff --git a/main.c b/main.c
index 5b719dc4b..f259fea3f 100755
--- a/main.c
+++ b/main.c
@@ -81,6 +81,10 @@
 #include "supervisor/shared/bluetooth.h"
 #endif
 
+#if CIRCUITPY_CANIO
+#include "common-hal/_canio/CAN.h"
+#endif
+
 void do_str(const char *src, mp_parse_input_kind_t input_kind) {
     mp_lexer_t *lex = mp_lexer_new_from_str_len(MP_QSTR__lt_stdin_gt_, src, strlen(src), 0);
     if (lex == NULL) {
@@ -226,6 +230,10 @@ void cleanup_after_vm(supervisor_allocation* heap) {
     free_memory(heap);
     supervisor_move_memory();
 
+    #ifdef CIRCUITPY_CANIO
+    common_hal_canio_reset();
+    #endif
+
     reset_port();
     #if CIRCUITPY_BOARD
     reset_board_busses();