Hardware Reference
In-Depth Information
// The first btye is GREEN, the second is RED.
var smile
=
[
0x00
,
0x3c
,
0x00
,
0x42
,
0x28
,
0x89
,
0x04
,
0x85
,
0x04
,
0x85
,
0x28
,
0x89
,
0x00
,
0x42
,
0x00
,
0x3c
];
var frown
=
[
0x3c
,
0x00
,
0x42
,
0x00
,
0x85
,
0x20
,
0x89
,
0x00
,
0x89
,
0x00
,
0x85
,
0x20
,
0x42
,
0x00
,
0x3c
,
0x00
];
var neutral
=
[
0x3c
,
0x3c
,
0x42
,
0x42
,
0xa9
,
0xa9
,
0x89
,
0x89
,
0x89
,
0x89
,
0xa9
,
0xa9
,
0x42
,
0x42
,
0x3c
,
0x3c
];
var blank
= [
0
,
0
,
0
,
0
,
0
,
0
,
0
,
0
,
0
,
0
,
0
,
0
,
0
,
0
,
0
,
0
,
0
];
b
.
i2cOpen
(
port
,
matrix
);
b
.
i2cWriteByte
(
port
,
0x21
);
// Start oscillator (p10)
b
.
i2cWriteByte
(
port
,
0x81
);
// Disp on, blink off (p11)
b
.
i2cWriteByte
(
port
,
0xe7
);
// Full brightness (page 15)
b
.
i2cWriteBytes
(
port
,
0x00
,
frown
);
sleep
.
usleep
(
time
);
b
.
i2cWriteBytes
(
port
,
0x00
,
neutral
);
sleep
.
usleep
(
time
);
b
.
i2cWriteBytes
(
port
,
0x00
,
smile
);
// Fade the display
var fade
;
for
(
fade
=
0xef
;
fade
>=
0xe0
;
fade
--) {
b
.
i2cWriteByte
(
port
,
fade
);
sleep
.
usleep
(
time
/
10
);
}
for
(
fade
=
0xe1
;
fade
<=
0xef
;
fade
++) {
b
.
i2cWriteByte
(
port
,
fade
);
sleep
.
usleep
(
time
/
10
);
}
b
.
i2cWriteBytes
(
port
,
0x04
, [
0xff
]);
This line states which bus to use. The last digit gives the BoneScript bus number.
This specifies the address of the LED matrix,
0x70
in our case.
