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#!/usr/bin/env python3
import pyvisa
import time
import sys
def test_idn():
idn = inst.query("*idn?");
assert (idn == "TinyUSB,ModelNumber,SerialNumber,FirmwareVer123456\r\n")
assert (inst.is_4882_compliant)
def test_echo(m,n):
longstr = "0123456789abcdefghijklmnopqrstuvwxyz" * 50
t0 = time.monotonic()
#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 (bad thing is that this made things slow)
t = time.monotonic() - t0
print(f" elapsed: {t:0.3} sec")
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():
inst.write("delay 50")
inst.read_stb() # clear STB
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(pyvisa.constants.VI_EVENT_SERVICE_REQ, pyvisa.constants.VI_QUEUE)
#waitrsp = inst.wait_on_event(pyvisa.constants.VI_EVENT_SERVICE_REQ, 5000)
#inst.discard_events(pyvisa.constants.VI_EVENT_SERVICE_REQ, pyvisa.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.monotonic()
try:
rsp = inst.read()
assert(False), "Read should have resulted in timeout"
except pyvisa.VisaIOError:
print(" Got expected exception")
t = time.monotonic() - t0
assert ((t*1000.0) > (inst.timeout - 300))
assert ((t*1000.0) < (inst.timeout + 300))
print(f"Delay was {t:0.3}")
# Response is still in queue, so send a clear (to be more helpful to the next test)
inst.clear()
time.sleep(0.3)
assert(0 == (inst.read_stb() & 0x10)), "MAV not reset after clear"
def test_abort_in():
inst.timeout = 200
# First read with no MAV
inst.read_stb()
assert (inst.read_stb() == 0)
inst.write("delay 500")
inst.write("xxx")
t0 = time.monotonic()
try:
rsp = inst.read()
assert(False), "Read should have resulted in timeout"
except pyvisa.VisaIOError:
print(" Got expected exception")
t = time.monotonic() - t0
assert ((t*1000.0) > (inst.timeout - 300))
assert ((t*1000.0) < (inst.timeout + 300))
print(f" Delay was {t:0.3}")
# Response is still in queue, so read it out (to be more helpful to the next test)
inst.timeout = 800
y = inst.read()
assert(y == "xxx\r\n")
def test_indicate():
# perform indicator pulse
usb_iface = inst.get_visa_attribute(pyvisa.constants.VI_ATTR_USB_INTFC_NUM)
retv = inst.control_in(request_type_bitmap_field=0xA1, request_id=64, request_value=0x0000, index=usb_iface, length=0x0001)
# pyvisa used to return (statuscode,bytes), but now only returns bytes, so we need to handle both cases
if(isinstance(retv,bytes)):
assert(retv == b'\x01')
else:
assert((retv[1] == pyvisa.constants.StatusCode(0)) and (retv[0] == b'\x01')), f"indicator pulse failed: retv={retv}"
def test_multi_read():
old_chunk_size = inst.chunk_size
longstr = "0123456789abcdefghijklmnopqrstuvwxyz" * 10
timeout = 10
x = longstr[0:174]
inst.chunk_size = 50 # Seems chunk size only applies to read but not write
inst.write(x)
# I'm not sure how to request just the remaining bit using a max count... so just read it all.
y = inst.read()
assert (x + "\r\n" == y)
#inst.chunk_size = old_chunk_size
def test_stall_ep0():
usb_iface = inst.get_visa_attribute(pyvisa.constants.VI_ATTR_USB_INTFC_NUM)
inst.read_stb()
# This is an invalid request, should create stall.
try:
retv = inst.control_in(request_type_bitmap_field=0xA1, request_id=60, request_value=0x0000, index=usb_iface, length=0x0001)
assert(False)
except pyvisa.VisaIOError:
pass
assert (inst.read_stb() == 0)
rm = pyvisa.ResourceManager()
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()
print("+test abort in")
test_abort_in()
inst.timeout = 2000
print("+ multi read")
test_multi_read()
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("+ Test EP0 stall recovery")
test_stall_ep0()
print("+ MAV")
test_mav()
print("+ SRQ")
test_srq()
print("+ indicate")
test_indicate()
print("+ TRIG")
test_trig()
# Untested:
# abort bulk out
# LLO, GTL, etc
# Throughput rate?
# Transmitting a message using multiple transfers
inst.close()
print("Test complete")
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