1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
import RPi.GPIO as GPIO
import time
def cleanup():
GPIO.cleanup()
def init_board(write = True):
GPIO.setmode(GPIO.BOARD)
if write:
oparm = GPIO.OUT
else:
oparm = GPIO.IN
# GPIO 0-7
# used as data pins, configure as input/output
GPIO.setup(11, oparm)
GPIO.setup(12, oparm)
GPIO.setup(13, oparm)
GPIO.setup(15, oparm)
GPIO.setup(16, oparm)
GPIO.setup(18, oparm)
GPIO.setup(22, oparm)
GPIO.setup(7, oparm)
# left side of T-cobbler, used as address pins
# configure address pins always out
GPIO.setup(26, GPIO.OUT)
GPIO.setup(24, GPIO.OUT)
GPIO.setup(23, GPIO.OUT)
GPIO.setup(21, GPIO.OUT)
GPIO.setup(19, GPIO.OUT)
GPIO.setup(10, GPIO.OUT)
GPIO.setup(8, GPIO.OUT)
# used to trigger a write
GPIO.setup(5, GPIO.OUT)
# used to read
GPIO.setup(3, GPIO.OUT)
# set the pins to high, pins are active low
GPIO.output(5, True)
GPIO.output(3, True)
def read_data():
GPIO.output(3, False)
time.sleep(0.3)
data = (GPIO.input(11))
print(GPIO.input(11))
data |= (GPIO.input(12) << 0x1)
print(GPIO.input(12))
data |= (GPIO.input(13) << 0x2)
print(GPIO.input(13))
data |= (GPIO.input(15) << 0x3)
print(GPIO.input(15))
data |= (GPIO.input(16) << 0x4)
print(GPIO.input(16))
data |= (GPIO.input(18) << 0x5)
print(GPIO.input(18))
data |= (GPIO.input(22) << 0x6)
print(GPIO.input(22))
data |= (GPIO.input(7) << 0x7)
print(GPIO.input(7))
print("read data: %s" % data)
time.sleep(0.3)
GPIO.output(3, True)
return data
# data should be one byte
def set_data(data):
GPIO.output(11, (data & 0x1) > 0)
print((data & 0x1) > 0)
GPIO.output(12, (data & 0x2) > 0)
print((data & 0x2) > 0)
GPIO.output(13, (data & 0x4) > 0)
print((data & 0x4) > 0)
GPIO.output(15, (data & 0x8) > 0)
print((data & 0x8) > 0)
GPIO.output(16, (data & 0x10) > 0)
print((data & 0x10) > 0)
GPIO.output(18, (data & 0x20) > 0)
print((data & 0x20) > 0)
GPIO.output(22, (data & 0x40) > 0)
print((data & 0x40) > 0)
GPIO.output(7, (data & 0x80) > 0)
print((data & 0x80) > 0)
# address should be one byte
def set_address(address):
GPIO.output(26, (address & 0x1) > 0)
print((address & 0x1) > 0)
GPIO.output(24, (address & 0x2) > 0)
print((address & 0x2) > 0)
GPIO.output(23, (address & 0x4) > 0)
print((address & 0x4) > 0)
GPIO.output(21, (address & 0x8) > 0)
print((address & 0x8) > 0)
GPIO.output(19, (address & 0x10) > 0)
print((address & 0x10) > 0)
GPIO.output(10, (address & 0x20) > 0)
print((address & 0x20) > 0)
GPIO.output(8, (address & 0x40) > 0)
print((address & 0x40) > 0)
# for DEBUG use only 7 address bits to have one left for read trigger
#GPIO.output(5, (address & 0x80) > 0)
#print((address & 0x80) > 0)
def write_data_at(address, data):
print("set address to: %s" % address)
set_address(address)
print("set data to: %s" % data)
set_data(data)
# wait so everythings is stable
time.sleep(0.3)
# trigger write on pin 5
GPIO.output(5, False)
time.sleep(0.3)
GPIO.output(5, True)
def read_data_at(address):
print("set address to: %s" % address)
set_address(address)
# wait a little bit so the address is stable
time.sleep(0.3)
# trigger output enable
data = read_data()
print("read data %s" % data)
|
