LMX2594EVM: Serial control through python

Darren,

The post by Dean Banerjee shows how to use TICS Pro's ActiveX interface to perform basic TICS Pro automation. However, you specifically requested a way to go around TICS Pro to talk to the USB2ANY directly. There is a way to do this, but I must advise you that it is not officially supported - any issues you encounter will be yours to deal with :)

With python, you can wrap the USB2ANY DLL included in TICS Pro using ctypes module's WinDLL wrapper. From there you can call any of the functions provided by the USB2ANY DLL. I've included a code snippet showing a basic example below. I caution that I have not tested this code, but it's based off an example script in our development repository so I assume anything wrong with it should be very quick to identify.

import ctypes
u2adll = ctypes.WinDLL(r"C:\path\to\USB2ANY.dll")

# Scan available USB2ANY devices
controllers = []
buf = ctypes.c_buffer(80)
for i in range(u2adll.u2aFindControllers()):
    controllers.append(u2adll.u2aGetSerialNumber(i, buf))

# Open a session with whatever the first USB2ANY is
if not controllers: raise Exception('no USB2ANY found')
handle = u2adll.u2aOpen(controllers[0])

# Configure SPI bus
bitRateKbps = 400
divider = int(24000 / bitRateKbps)
dividerHigh = (divider >> 8) & 0xFF
dividerLow = (divider & 0xFF)
errCode = u2adll.u2aSPI_Control(handle, #u2a handle
                                1,      #SPI capture on leading edge
                                0,      #SPI inactive state low
                                1,      #SPI MSB first
                                0,      #SPI 8-bit
                                1,      #SPI with every packet
                                1,      #SPI active low
                                dividerHigh,
                                dividerLow)
if errCode < 0: raise Exception('failed to configure SPI bus: ' + str(errCode))

# Write and Read
numerator = 0xDEADBEEF
packet1 = 0x260000 + ((numerator >> 16) & 0xFFFF)
packet2 = 0x270000 + (numerator & 0xFFFF)
buf = ctypes.c_buffer(3) #register length is three bytes for LMX2594

buf[0] = (packet1 >> 16) & 0xFF
buf[1] = (packet1 >> 8) & 0xFF
buf[2] = packet1 & 0xFF
errCode = u2adll.u2aSPI_WriteAndRead(handle, 3, buf)
if errCode < 0: raise Exception('failed to write first packet')

buf[0] = (packet2 >> 16) & 0xFF
buf[1] = (packet2 >> 8) & 0xFF
buf[2] = packet2 & 0xFF
errCode = u2adll.u2aSPI_WriteAndRead(handle, 3, buf)
if errCode < 0: raise Exception('failed to write second packet')

buf[0] = 0xEF
buf[1] = 0x00
buf[2] = 0x00
errCode = u2adll.u2aSPI_WriteAndRead(handle, 3, buf)
if errCode < 0: raise Exception('failed to read R111')
rb_VCO_CAPCTRL = ord(buf[2]) # R111[7:0]

# Close session
u2adll.u2aClose(handle)

There is an API document attached below which details the functions that are made available by the USB2ANY DLL - this is where I am getting the function names for the u2adll object in the code snippet. I never found a non-preliminary copy of the API document for firmware revision 2.7.0.0, but it should still be accurate - we use this to target the USB2ANY DLL and firmware revision packaged with TICS Pro.

api_reference_for_usb2any_sdk_2.7.0.pdf

Regards,

Derek Payne

I'll mark the thread as TI Thinks Resolved. You retain the ability to re-open the thread for up to 30 days by replying, and you also have the ability to open a thread that references this thread. If you have more questions, feel free to ask; they will get routed back to me since this is subject matter that I cover.

Regards,

Derek Payne