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#Diagram demonstrating how to build a command link for an I2C master to read n bytes from a slave
blockdiag i2c-command-link-master-read {
# global properties
span_width = 5;
span_height = 5;
node_height = 25;
default_group_color = lightgrey;
class spacer [shape=none, width=10];
class cmdlink [colwidth=2, width=180];
class cjoint [shape=none, width=40];
# all the rows
0 -- a0 -- f0 [style=none];
1 -- a1 -- b1 -- c1 -- d1 -- e1 -- f1 -- g1 -- h1 -- i1 -- j1 [style=none];
2 -- a2 -- b2 -- c2 -- d2 -- e2 -- f2 -- g2 -- h2 -- i2 [style=none];
3 -- a3 -- d3 -- f3 -- h3 [style=none];
4 -- a4 [style=none];
5 -- a5 [style=none];
6 -- a6 -- c6 [style=none];
7 -- a7 -- c7 -- d7 [style=none];
8 -- a8 -- c8 -- f8 [style=none];
9 -- a9 -- c9 -- h9 [style=none];
10 -- a10 -- c10 -- j10 [style=none];
11 -- a11 [style=none];
12 -- a12 [style=none];
# separator row
3, a3, d3, f3, h3 [shape=none, height=5];
# tuning node properties and connections
0 [class=spacer]; a0 [shape=none, colwidth=5]; f0 [shape=note, colwidth=2];
1 [class=spacer]; a1 [shape=none]; b1; c1 [width=40]; e1 [shape=none, width=30]; f1 [shape=none]; g1 [width=30]; h1 [shape=none]; i1 [width=30]; j1 [width=40];
2 [class=spacer]; a2 [shape=none]; b2; c2 [class=cjoint]; d2 [shape=none]; e2 [width=30]; g2 [shape=none, width=30]; i2 [shape=none, width=30];
3 [class=spacer]; a3 [shape=none, colwidth=3]; d3 [colwidth=2]; f3 [colwidth=2]; h3 [colwidth=2];
4 [class=spacer]; a4 [class=cmdlink]
5 [class=spacer]; a5 [class=cmdlink];
6 [class=spacer]; a6 [class=cmdlink]; c6 [class=cjoint]; a6 -- c6 [style=solid]; c6 -- c2 -> c1 [folded];
7 [class=spacer]; a7 [class=cmdlink]; c7 [class=cjoint]; d7 [shape=none, colwidth=2]; a7 -- c7 -- d7 [style=solid]; d7 -> d3 [folded];
8 [class=spacer]; a8 [class=cmdlink]; c8 [class=cjoint, colwidth=3]; f8 [shape=none, colwidth=2]; a8 -- c8 -- f8 [style=solid]; f8 -> f3 [folded];
9 [class=spacer]; a9 [class=cmdlink]; c9 [class=cjoint, colwidth=5]; h9 [shape=none, colwidth=2]; a9 -- c9 -- h9 [style=solid]; h9 -> h3 [folded];
10 [class=spacer]; a10 [class=cmdlink]; c10 [class=cjoint, colwidth=7]; j10 [shape=none, width=40]; a10 -- c10 -- j10 [style=solid]; j10 -> j1 [folded];
11 [class=spacer]; a11 [class=cmdlink];
12 [class=spacer]; a12 [class=cmdlink];
# labels
f0 [label="Data (n-1) times", shape=note, color=yellow];
b1 [label=Master, shape=note, color=lightyellow]; c1 [label=START]; d1 [label="Slave Address"]; g1 [label=ACK]; i1 [label=NAK]; j1 [label=STOP];
b2 [label=Slave, shape=note, color=lightyellow]; e2 [label=ACK]; f2 [label=Data]; h2 [label=Data];
a4 [shape=note, label=Commands, color=yellow];
a5 [label="cmd = i2c_cmd_link_create()", numbered = 1];
a6 [label="i2c_master_start(cmd)", numbered = 2];
a7 [label="i2c_master_write_byte(cmd, Address, ACK)", numbered = 3];
a8 [label="i2c_master_read(Data, n-1, ACK)", numbered = 4];
a9 [label="i2c_master_read(Data, 1, NAK)", numbered = 5];
a10 [label="i2c_master_stop(cmd)", numbered = 6];
a11 [label="i2c_master_cmd_begin(I2c_port, cmd, wait)", numbered = 7];
a12 [label="i2c_cmd_link_delete(cmd)", numbered = 8];
# Slave Address
group { d1; e1; }
group { d2; e2; d3; }
# Data x (n - 1) times
group { f1; g1;}
group { f2; g2; f3; }
# Data
group { h1; i1; }
group { h2; i2; h3; }
}