Chapter 19 74HC595 & LED Matrix
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d e f
shiftOut
(
dPin
,
cPin
,
order
,
val
):
f o r
i
i n
range
(
0
,
8
):
GPIO
.
output
(
cPin
,
GPIO
.
LOW
);
i f
(
order
= =
LSBFIRST
):
GPIO
.
output
(
dPin
,(
0x01
&(
val
>>
i
)==
0x01
)
a n d
GPIO
.
HIGH
o r
GPIO
.
LOW
)
e l if
(
order
= =
MSBFIRST
):
GPIO
.
output
(
dPin
,(
0x80
&(
val
<<
i
)==
0x80
)
a n d
GPIO
.
HIGH
o r
GPIO
.
LOW
)
GPIO
.
output
(
cPin
,
GPIO
.
HIGH
);
d e f
loop
( ):
w h ile
T r ue
:
f o r
j
i n
range
(
0
,
500
):
# Repeat enough times to display the smiling face a period
of time
x
=
0x80
f o r
i
i n
range
(
0
,
8
):
GPIO
.
output
(
latchPin
,
GPIO
.
LOW
)
shiftOut
(
dataPin
,
clockPin
,
MSBFIRST
,
pic
[
i
])
#first shift data of line
information to first stage 74HC959
shiftOut
(
dataPin
,
clockPin
,
MSBFIRST
,~
x
)
#then shift data of column
information to second stage 74HC959
GPIO
.
output
(
latchPin
,
GPIO
.
HIGH
)
# Output data of two stage 74HC595 at the
same time
time
.
sleep
(
0.001
)
# display the next column
x
> > =
1
f o r
k
i n
range
(
0
,
len
(
data
)-
8
):
#len(data) total number of "0-F" columns
f o r
j
i n
range
(
0
,
20
):
# times of repeated displaying LEDMatrix in every frame,
the bigger the "j", the longer the display time.
x
=
0x80
# Set the column information to start from the first column
f o r
i
i n
range
(
k
,
k
+
8
):
GPIO
.
output
(
latchPin
,
GPIO
.
LOW
)
shiftOut
(
dataPin
,
clockPin
,
MSBFIRST
,
data
[
i
])
shiftOut
(
dataPin
,
clockPin
,
MSBFIRST
,~
x
)
GPIO
.
output
(
latchPin
,
GPIO
.
HIGH
)
time
.
sleep
(
0.001
)
x
> > =
1
d e f
destroy
():
# When 'Ctrl+C' is pressed, the function is executed.
GPIO
.
cleanup
()
i f
__name__
= =
'__main__'
:
# Program starting from here
p r int
(
'Program is starting...'
)
setup
()
t r y
:
loop
( )
Summary of Contents for Ultimate Starter Kit
Page 1: ...Free your innovation Freenove is an open source electronics platform www freenove com ...
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Page 155: ...155 Chapter 14 Relay Motor www freenove com support freenove com Hardware connection OFF 3 3V ...
Page 173: ...173 Chapter 16 Stepping Motor www freenove com support freenove com Hardware connection ...
Page 239: ...239 Chapter 22 Matrix Keypad www freenove com support freenove com Circuit Schematic diagram ...
Page 240: ...Chapter 22 Matrix Keypad 240 www freenove com support freenove com Hardware connection ...
