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
|
import visa
import time
import sys
def test_idn():
idn = inst.query("*idn?");
assert idn == "TinyUSB,ModelNumber,SerialNumber,FirmwareVer123456\r\n"
def test_echo(m,n):
longstr = "0123456789abcdefghijklmnopqrstuvwxyz" * 50
#Next try echo from 1 to 175 characters (200 is max buffer size on DUT)
for i in range(m,n):
#print(i)
x = longstr[0:i]
xt = x + inst.write_termination
y = inst.query(x)
#print(x)
#print (":".join("{:02x}".format(ord(c)) for c in xt))
#print (":".join("{:02x}".format(ord(c)) for c in y))
assert(xt == y), f"failed i={i}"
inst.read_stb();# Just to make USB logging easier by sending a control query
def test_trig():
# clear SRQ
inst.read_stb()
assert (inst.read_stb() == 0)
inst.assert_trigger()
time.sleep(0.3) # SRQ may have some delay
assert (inst.read_stb() & 0x40), "SRQ not set after 0.3 seconds"
assert (inst.read_stb() == 0)
def test_mav():
assert (inst.read_stb() == 0)
inst.write("123")
time.sleep(0.3)
assert (inst.read_stb() & 0x10), "MAV not set after 0.5 seconds"
rsp = inst.read()
assert(rsp == "123\r\n")
def test_srq():
assert (inst.read_stb() == 0)
inst.write("123")
#inst.enable_event(visa.constants.VI_EVENT_SERVICE_REQ, visa.constants.VI_QUEUE)
#waitrsp = inst.wait_on_event(visa.constants.VI_EVENT_SERVICE_REQ, 5000)
#inst.discard_events(visa.constants.VI_EVENT_SERVICE_REQ, visa.constants.VI_QUEUE)
#inst.wait_for_srq()
time.sleep(0.3)
stb = inst.read_stb()
msg = "SRQ not set after 0.5 seconds, was {:02x}".format(stb)
assert (stb == 0x50),msg
assert (inst.read_stb() == 0x10), "SRQ set at second read!"
rsp = inst.read()
assert(rsp == "123\r\n")
def test_read_timeout():
inst.timeout = 500
# First read with no MAV
inst.read_stb()
assert (inst.read_stb() == 0)
inst.write("delay 500")
t0 = time.time()
try:
rsp = inst.read()
assert(false), "Read should have resulted in timeout"
except visa.VisaIOError:
print("Got expected exception")
t = time.time() - t0
assert ((t*1000.0) > (inst.timeout - 300))
assert ((t*1000.0) < (inst.timeout + 300))
print(f"Delay was {t}")
rm = visa.ResourceManager("/c/Windows/system32/visa64.dll")
reslist = rm.list_resources("USB?::?*::INSTR")
print(reslist)
if (len(reslist) == 0):
sys.exit()
inst = rm.open_resource(reslist[0]);
inst.timeout = 3000
inst.clear()
print("+ IDN")
test_idn()
inst.timeout = 3000
print("+ echo delay=0")
inst.write("delay 0")
test_echo(1,175)
print("+ echo delay=2")
inst.write("delay 2")
test_echo(1,175)
print("+ echo delay=150")
inst.write("delay 150")
test_echo(53,76)
test_echo(165,170)
print("+ Read timeout (no MAV")
test_read_timeout()
print("+ MAV")
test_mav()
print("+ SRQ")
test_srq()
print("+ TRIG")
test_trig()
inst.close()
print("Test complete")
|
