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analogdevicesinc / libsmu

Software abstractions for the analog signal exploration tools.
http://analogdevicesinc.github.io/libsmu/
BSD 3-Clause "New" or "Revised" License
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ctrl_transfer() documentation/examples #187

Closed jmball closed 2 years ago

jmball commented 3 years ago

I've been looking into using the ctrl_transfer() method in pysmu to get lower level control of the device. However, I'm struggling to find any clear documentation or examples showing how to use it and what settings are possible with the ADALM1000. Are there any detailed resources available to learn about it?

AlexandraTrifan commented 3 years ago

Hi,

Pysmu.ctrl_transfer() is based on libusb_control_transfer. You can check out the libusb documentation here: https://libusb.sourceforge.io/api-1.0/group__libusb__syncio.html#gadb11f7a761bd12fc77a07f4568d56f38 for parameter explanation. The link to the official libsmu documentation is this one: http://analogdevicesinc.github.io/libsmu/classsmu_1_1Device.html#ae0d035b18c9ae682c9cd651f94417274 .

For the request field for the setup packet (bRequest argument) all the options are specified in the firmware. https://github.com/analogdevicesinc/m1k-fw/blob/master/src/main.c#L614-L830 The highlighted lines contain all the options available for this low level USB access.

For the request type field for the setup packet (bmRequestType argument) you can use 0xC0 (read) and 0x40 (write).

One simple example: import pysmu s = pysmu.Session() dev = s.devices[0] dev.ctrl_transfer(0x40, 0x03, 7, 0, 0, 1, 100)

This will write value "7" and all the 3 LEDs will light up, as explaned in the code comments: https://github.com/analogdevicesinc/m1k-fw/blob/master/src/main.c#L650

Please let me know if you have any others questions!

Thanks! -Alexandra

jmball commented 3 years ago

@AlexandraTrifan , thanks for sending the info!