esp-idf/docs/_static/diagrams/can/can_controller_signals.diag

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#Diagram of CAN controller signal lines
blockdiag can_controller_signals_diagram {
orientation = portrait;
span_width = 80;
#Column 1 nodes
can[label = "CAN Controller", fontsize = 15, shape = roundedbox];
#Column 2 nodes
tx[label = "TX", shape = endpoint];
rx[label = "RX", shape = endpoint];
bus_off[label = "BUS-OFF", shape = endpoint];
clkout[label = "CLKOUT", shape = endpoint];
#Column 3 nodes
hide1 [shape = none];
hide2 [shape = none];
hide3 [shape = none];
hide4 [shape = none];
group {
orientation = portrait;
color = none;
#Group column 1 nodes vertically
can;
}
group {
orientation = portrait;
color = none;
#Group column 2 nodes vertically
tx; rx; bus_off; clkout;
}
group {
orientation = portrait;
color = none;
label = "GPIO Matrix";
fontsize = 20;
shape = line;
#Group column 3 nodes vertically
hide1; hide2; hide3; hide4;
}
can -> tx [folded];
can -> rx [folded];
can -> bus_off [folded];
can -> clkout [folded];
tx -> hide1 [folded];
rx -> hide2 [folded];
bus_off -> hide3 [folded, label = "Optional"];
clkout -> hide4 [folded, label = "Optional"];
}