Does anyone has example VI using USB-8451 with analog devices isensor? I am new to SPI interface and very slowly learning how to use labview in conjunction with USB-8451 to do SPI sensor reading.
Any help would be appreciated. I'm using labview 8.5.
Any help would be appreciated. I'm using labview 8.5.
- Make sure your NI device is connected to your computer's USB port. Open the Start menu and type 'devmgmt.msc' in the search bar, then hit the Enter key to open the Windows Device Manager. Expand the entries Sound, video and game controllers and Universal Serial Bus devices. If an exclamation mark appears next to your device entry (see picture.
- Nov 03, 2020 The USB-8451 is a VISA Resource and appears in Measurement & Automation Explorer (MAX) in the USB Devices section. It is assigned a standard VISA resource descriptor. This allows you to use the VISA Find Resources VI in LabVIEW to determine if the USB-8451 is present in the system. An example can be seen below.
elpiar wrote:
It's working!
Well, I realized I made a small mistake in the example. The number of bytes in the array constant should be 4, not 2. The device is full duplex, meaning you can write and read from it at the same time. The NI-845x SPI Write Read VI returns the same number of bytes as the number of bytes that were written. Thus, with just 2 bytes you will not actually get the current value of the register. You would get the values from the previous command. See attached mod.
Now if I read the data is burst mode, will the output be automatically be arranged in an array of 8-bit length words? You mention something about send out out 8 clock burst. I'm not sure how I do this.
For burst mode you have to send out more bytes so you get clocks generated for the read to occur. The burst mode command is 3E00. That needs to be followed by 12 16-bit numbers for the device to return all the registers from SUPPLY_OUT to AUX_ADC. The actual bytes after the 3E00 are irrelevant for a write. The NI-845x SPI Write Read VI should then return 26 bytes (2 bytes that line up with the 3E00 command, followed by 2 bytes per register, for 12 registers). You can convert this into an array of U16 values and do the conversions based on which register you're actually reading. I've attached a VI to get you started. The example converts the SUPPLY_OUT register and each of the GYRO_OUT registers. You can finish the VI. Note that you should make the 14-bit to 16-bit extension a subVI so you're not duplicating code.
NOTE: As with all example code that is provided you should verify that the numbers you get are correct. We don't have the hardware, so we can't verify correct operation.
Attachments:
ADIS16400 XGYRO_OUT v2.vi 29 KB
ADIS16400 Burst Read Example.vi 36 KB
It's working!
Well, I realized I made a small mistake in the example. The number of bytes in the array constant should be 4, not 2. The device is full duplex, meaning you can write and read from it at the same time. The NI-845x SPI Write Read VI returns the same number of bytes as the number of bytes that were written. Thus, with just 2 bytes you will not actually get the current value of the register. You would get the values from the previous command. See attached mod.
Now if I read the data is burst mode, will the output be automatically be arranged in an array of 8-bit length words? You mention something about send out out 8 clock burst. I'm not sure how I do this.
For burst mode you have to send out more bytes so you get clocks generated for the read to occur. The burst mode command is 3E00. That needs to be followed by 12 16-bit numbers for the device to return all the registers from SUPPLY_OUT to AUX_ADC. The actual bytes after the 3E00 are irrelevant for a write. The NI-845x SPI Write Read VI should then return 26 bytes (2 bytes that line up with the 3E00 command, followed by 2 bytes per register, for 12 registers). You can convert this into an array of U16 values and do the conversions based on which register you're actually reading. I've attached a VI to get you started. The example converts the SUPPLY_OUT register and each of the GYRO_OUT registers. You can finish the VI. Note that you should make the 14-bit to 16-bit extension a subVI so you're not duplicating code.
NOTE: As with all example code that is provided you should verify that the numbers you get are correct. We don't have the hardware, so we can't verify correct operation.
Attachments:
ADIS16400 XGYRO_OUT v2.vi 29 KB
ADIS16400 Burst Read Example.vi 36 KB
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Similar Messages
Ni Usb 8451 Driver For Mac Os
- Hello,
I am new to LabView and data aqusition. I have LabView 8.5.1 installed on my laptop, and I studied the Getting Started document of LabView, except the data aqusition chapter.
I have microfabricated a differential capacitive sensor, and now I want to test the capabilities of my sensor.
After asking NI engineers, I have been suggested to use USB-8451 with AD7747 (24-Bit Capacitance-to-Digital Converter) from Analog Devices because AD7747 has I2C serial interface.
I have ordered USB-8451, AD7747, and Evaluation Board for AD7747. And I am waiting for them.
Are there any suggestions about how to connect my differential capacitive sensor to AD7747, and eventually to USB-8451?
You may want to know some further information to answer my question:
*The sensor is similar to the sensor on pages 501, 514, and 515 of 'Microsystem Design' book from author Stephen D. Senturia.
*The datasheet for AD7747 can be reached from this link: http://www.analog.com/static/imported-files/data_sheets/AD7747.pdf
*My purpose is to make a very precise and accurate 'displacement measurement micodevice' by using 'the change in the capacitance' during the motion of the mobile fingers of the sensor.
As an initial challenge for myself, I will feel satisfied if I can measure the capacitance change in my sensor when I apply an external mechanical disturbance to my sensor. For example, there must be a change in capacitance if I just swing my hand from top of the sensor region.
I am looking forward for your reply,
Thanks in advance,
Sincerely,
sriverfxtrHi Aaron,
Here you go, this is made with a USB-8452.
When you run the code tick the power en dac enable box on.
Maybe you can help me with my problem, I want to use a fiber to sense light from a led.
Do you use any fiber hardware with the TCS3414?
gr,
Attachments:
TCS3414.vi 63 KB - I have a an ADC chip want to control/acquire data using USB-8451 SPI/I2C module.
I have setupped initial SPI settings (clock edge, polarity, speed etc).
If i passed SPI command 3F; the ADC will output data continously..
How can i read this data continously in LV8.5?
how does the program looks like?
I tried while loop. but in while loop I am continuously sending commands isnt it?.
what is the best way to do?
can some one help me on this?
naushicaBonjour Jerome,
Malheureusement, cette carte ne peut pas être utilisé en mode esclave.
Concernant l'utilisation des signaux MISO et MOSI je pense que vous possédez déjà la doc de la carte. Sinon la voici :
http://www.ni.com/pdf/manuals/371709b.pdf
Par ailleurs, je vous invite à consulter cette article qui pourrait peut-être vous aider :
http://zone.ni.com/devzone/cda/tut/p/id/8359
N'hésitez pas à nous répondre si vous avez encore des questions en précisant quel logiciel vous utilisez (LabVIEW..) et avec quel microcontroleur vous souhaitez dialoguer.
Cordialement
Jean-Philippe
Jean-Philippe C.
National Instruments France - I have a M-audio mobile usb audio/midi interface with preamps and fastTrack Pro software that i'm having trouble using with garage band. I just got this Mac os x 10.4.10 and i'm unfamiliar with GB and how to get a audio signal to register from my mic through the mobile usb audio/midi interface to GB.
any suggestions??http://www.bulletsandbones.com/GB/GBFAQ.html#selectinterface ?? - Does anyone have a typical SPI example VI for the USB-8451 Interface. I want to program a VI for a SPI device, but I don't know how. This example should include DIO Line programming as well, if possible. Term pro enclosure design software, free download.Hello thmsfrst,
http://zone.ni.com/devzone/conceptd.nsf/webmain/B380E99DAAD898B38625710F007003C5?OpenDocument
This link shows an example how to the USB8451 and the SPI Interace to evaluate a TI ADC
The example download does not work so i have attached an example for LV8.0 and one for 7.1.
If you have further questions don't hasitate to ask
Stefan
Attachments:
example.7z 92 KB - I have a USB-8451 that I am using for SPI communications. The USB-8451 is the master device, and I have no problem sending and recieving data. The problem is that I cannot send what I want to with the USB-8451. When I execute a read command for 16 bit data, the USB-8451 sends 0x0300. I need to send certain commands over SPI in order to get the correct response; ie - send 0x1000, 0x2000, 0x3000, etc. I have not found a way to do this, and it is very critical that I am able to for this project to work correctly. Any suggestions?Hello Johu,
The SPI Read Write vi has a data write input which takes in an array of bytes. If you want to ONLY read 16 bit, you have to put an array of 2 bytes which are 0. Since SPI is a full duplex protocol, it will send 0x00 0x00 and receive 16 bits at the same time.
Usually, you send a command before reading. So, you would send a total of three bytes, the first one being your command. The first byte returned would not contain any data, since your device is reading the command. The 2 last bytes would contain your data. So:
Bytes Sent Bytes Read
CMD 0 (or should be 0)
0 Data1
0 Data2
You can download these test panels and try to using them to send your commands and read your data.
Please let me know if any of this is not clear or if you need more help with this. Have a great day.
O. Proulx
National Instruments
www.ni.com/support - Is it possible to release the SPI clock signal so it reamins high immediately after sending data on the SDO line? Currently, SCLK is held low for a significant period of time after transmission of the final data bit before it is released to a logic high state. Is there a way to configure this? Is there also a way to configure DIO signals independent of the SPI using scripting?Hi John,
I believe you are referring to the clock polarity and phase.
Where Can I Find More Information About the SPI Clock in a USB-8451?
http://digital.ni.com/public.nsf/allkb/4FB0A184E545AC1586257609007537EF?OpenDocument
The information is found here in the NI-845x Hardware and Software Manual:
http://www.ni.com/pdf/manuals/371746e.pdf#page=26
Additionally, beyond using SPI scripting, we can use the basic SPI and basic DIO examples installed with the 845x driver in Help > Find Examples.
Joey S.
Software Product Manager
National Instruments - Hey.
My USB ports are only working with powered devices ( such as an interactive white board) they are not working wiht a USB modem, it picks up but doenst have the energy to dial out. it also doesnt work with a flash drive.
this is only recent after i updated non vital programs such as printer things.
now the other problem is that i have not updated this too recently but i dont mind losing some info.
ps. i have done all of the restarts such as smc, ram. pram. the only thing i have not done is take out the batt. but thats becuase its really hard to do and there are warnings all over it saying dont remove.
p.p.s i am running snow10.6.8
Please help becuase i need it to help teach some of my stundets and not being able to use a USB or the internet to research is impeeding my planning.
Thanks so much in advance
AndrewOne final detail. it is a 2011 early model. if there is any more details that you want please ask. i am very desperate because i dont want to take it to apple unless i have to. - Hi All,
I am tring to write SPI 16 bits command to TI TLV5638 DAC.
Labview examples are for 8 bits only. can anyone help me?
Thanks,
Eliran.
Message Edited by Eliran11 on 06-29-2008 02:44 AMHi Eliran,
The USB 8451 supports only 8 bit communication.
This KB has a suggestion on how to implement 16 bit commands. 'The approach you would take when writing or reading a 16 bit number is
to write or read a byte array of length 2. You can use a Type Cast to
convert back and forth between arrays of 8 bit integers and arrays of
16 bit integers.'
Hope this helps!
Warm regards,
Karunya R
National Instruments
Applications Engineer - Hi,
I have 2 front USB ports and have wired everything correctly (not using the 10th pin). I tried my digital camera and the maxtor USB hard drive and they both work. When I try plugging the Adaptec VideOh! USB capturing device, it doesn't seem to work right. It is detected and the drivers for it installed correctly, but I can't capture any video. When I unplugged it and plugged it to any of the 4 ports on the back, it works fine. The D-bracket ports also worked ok with the device. I wired the 2 front usb ports the same way as the d-bracket (they both have the same color wirings). The front ports seemed to work ok with the other devices I mentioned, just not the Adaptec Videoh! USB device. There is a JUSB1 and a JUSB2 on the motherboard. Are both the same? I have JUSB1 for the D-bracket and JUSB2 for the front usb ports. Both are wired the same. I just wonder why the Adaptec device can work with the D-bracket and not the front USB ports even when they are connected the same way. Any suggestions?At the cable end that plugs into the motherboard snip the jumpers between pins 7-9 and 8-10. See Wonkanoby's signature for a link to diagrams. - Bonjour,
peux t on configurer le module USB 8451 en mode Slave.
comment utiliser les sorties MISO et MOSI
je cherche a recuper les informations d'un microcontroleur en mode maitre qui envoie des donnees 8 bits ( il fournit la clock , le cs et les donnees )
merci pour votre aide
salutationBonjour Jerome,
Malheureusement, cette carte ne peut pas être utilisé en mode esclave.
Concernant l'utilisation des signaux MISO et MOSI je pense que vous possédez déjà la doc de la carte. Sinon la voici :
http://www.ni.com/pdf/manuals/371709b.pdf
Par ailleurs, je vous invite à consulter cette article qui pourrait peut-être vous aider :
http://zone.ni.com/devzone/cda/tut/p/id/8359
N'hésitez pas à nous répondre si vous avez encore des questions en précisant quel logiciel vous utilisez (LabVIEW..) et avec quel microcontroleur vous souhaitez dialoguer.
Cordialement
Jean-Philippe
Jean-Philippe C.
National Instruments France - Hi,
I am using SPI 8451 Module to send commands to AD7904 (4 input multiplexer ADC).
I have set up the VI to read/write from 1 channel only. I have a constant voltage on my input but the read data is constantly varying. Biochemical evidence for evolution lab 12 answers.
i think the problem I am facing is that SPI 8541 can only write 8 bit word and I am writing 16 bit word to my AD7904.
If someone knows how to make the usb spi 8541 to write/read 16 bit word, then my issue is resolved.
Thanks
AllanHi,
for 16 bit, it should be a case of writing / reading 8 bits twice so using the array of data itself.
You may need to re-order the either the bit order, or the byte order to match you device though. You can split and join two 8 bit numbers from/to a 16 bit one using the inbuilt vi's on the data manipulation palette.
For the AD7904 I believe the MSB is the first one in the stream, so you may need to re-order the data to match correctly and since the AD7904 is only actually expecting 12 bits of data, but requires 16 clocks, then you need to make sure you've pushed the data to the correct end of the two 8 bit numbers.
The timing performing this however might not match to the AD7904 if it introduces a SCLK setup time delay in between each byte (hence an array of them shouldn't generate the delay).
Have a look at the shipping Atmel AT25080A Read.vi (and the matching write one) under the example finder - search for SPI.
You should find that there's a 16 bit number split into 2 8 bits for transmission before going into a build array with the 0x3 read command on the front.
Hope that helps
Thanks
Sacha Emery
National Instruments (UK)
// it takes almost no time to rate an answer - Hi all,
I am trying to interface AT45DB3 with a simple labview program that should read out the manufacturing code of the chip. The running of this program results in FF instead of 1F. I tried different ways, but no luck in reading out the right code. Can someone help me with this? I am attaching the current labview VI if anyone wants to take a look at it. Thanks.
~Vmin
Attachments:
flashdevice_idread.vi 23 KBHello vmin:
Have you tried running a shipping example in LabVIEW. For example the General SPI Write(or Read).vi. Does the same problem occur?
Message Edited by Roland A. on 11-13-2007 02:37 PM
Regards,
Roland A.
Applications Engineer
National Instruments
Check out VI Roadshow - So this one has me scratching my head. My USB ports on the back of my iMac are working except for a few devices. 1 being a logitech USB receiver, and 1 being a usb mp3 player. When I plug the received into the iMac the keyboard won't work, but when I plug my USB hub into the same USB port and the receiver into the hub it works fine. The mp3 player isn't working in any usb/hub (so that's a mook point).
Here's what I've tried to resolve this issue:
1. Reset iMac
2. Reset PRAM
3. Try every usb port on the back of the iMac
None of these have fixed my issue. Plugging it into the hub isn't a huge deal, but I'd like the option to use my USB ports as I wish without having to deal with this. Anyone have advice on a solution?It is not a matter of using your USB ports as you wish, it is a matter of what you are plugging into them and the power demands that what you plug into them makes on the system.
Not all USB ports or devices are created equal. How many ports are you using? What exactly are you plugging into the ports? What is the power demand of each item that you are plugging into each port? Are any of the USB devices self powered from their own separate power supply? Are all of the devices dependent upon the iMac for power?
It sounds to me that you have too many high power devices demanding more power through the ports than the iMac can accommodate. Is the USB hub self powered? If so, that is probably why it resolves your issue with the Logitech Unified receiver. There is very little info on this device on the Logitech website, so I could not ascertain its power demands.
Dah•veed - Hi,
I'm trying to communicate with the Max1108 (datasheet attached)
when using 8451 Test Panel I get random results,only once i got expected results and i captured this moment(i cant reproduce it somehow)
I followed this code,
http://forums.ni.com/ni/attachments/ni/170/283809/1/MLX90316%20Read.c
which was published by NI in forums.and got same results when I use script functions(code1), and empty read buffer when using regular spi API's (code2)
Please ignore the c# adjustments .
what am i doing wrong ?
Thanks,
Ori
Attachments:
MAX11008 DS.pdf 646 KB
code2.txt 9 KB
code1.txt 3 KBSolved, thanks for your 'help'
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