Bascom Spi Newbie Problem

MichaelB. · Joined: 04 May 2017 Posts: 58

Hi again, for a newbie Problem, and need a Specialist for SPI.
This time i try me on the SPI comunication between a Atmega32 and a SCA100T-D02 Anglesensor.
I make some Comments in the Code for you that will may help.

First, i had Create and send a 8 bit register code to the Anglesensor, to say that i will only read the 11 bit " Y " Values from the Sensor.
After that, i send two 8 bit packages to Shift it in the sensor, and the Sensor answers on the MISO line with the Y values.
I checked that with my "PeakTech 1350" Pen-Type Oscilloscpoe.
The "Y" Values on the MISO line is changing as Expected when tilt the Sensor.
BUT. Nothing more happens. My expectaion is that the MISO data "LoadY" is convert it into "Wert1"
The Zero Angle Position is "10000000000" witch is 1024, and in my Code it shall show me on my 7Segments a " 0 " on my Breadbord.
But it shows nothing, what do i miss here. Can anyone Help me in this case?

Best Regards
Michael

(BASCOM-AVR version : 2.0.7.8 )

MWS · Joined: 22 Aug 2009 Posts: 2262

First: you can not be serious to post code as bitmap.

In case the uC is the master, SPI communication depends on shifting bits out via MOSI, master out slave in, and getting bits in via MISO, master in slave out.
The visible bitmap-part of your code uses nowhere commands to get data like SPIIN, SPIMOVE, there's only SPIOUT, you only talk but you do not listen.

Do you expect the requested bits are somehow magically transferred into the uC?
You have to cut down the controllers case at least one mm to make that magic work, i.e. let it out LOL

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

Michael, some pictures say more than 1000 words but in order to give help, you should post code, and please embed them with the CODE tags.
This way we can copy and past the code and check it.
Also, when using some chip, give a link to the data sheet PDF so we do not need to search for the data sheet.

MichaelB. · Joined: 04 May 2017 Posts: 58

Oh sure. Here is the PDF and the Code.
http://www.produktinfo.conrad.com/datenblaetter/400000-424999/406067-da-01-en-NEIGUNGSSENSOR_SCA100T_D02.pdf

kimmi · Joined: 24 Feb 2006 Posts: 1922 Location: Denmark

why do you have "Cls" in your code its for lcd !!!!

and how did you connect 7 segment the :

MichaelB. · Joined: 04 May 2017 Posts: 58

Maybe my mess will help you ^^

MWS · Joined: 22 Aug 2009 Posts: 2262

Hmm, what you're discussing about?
Led-pins?
Why?
It may be funny to discuss such things, but this does not solve anything. Makes no sense.

I wrote it already: if one wants to get data, one needs to fetch them, in this case from MOSI.
And this has to be done by clocking 11 bits in, the schema on page 12 shows exactly how to do it.

As it is described there, 11 bits need to be clocked in.
It is not clear what happens, if 16 bits are clocked in, in case the chip locks up while trying to clock 16 bit, then reading data can not be done with hardware SPI, which works on multiples of its register width of 8 bits.
Then it needs to be done with some simple code, however watching the TO's uninspired code-snake, I'm not sure if he can handle it.

But in case he's lucky, it won't matter whether clocking 11 or 16 bits in, clocking 2 bytes in by SPIIN() will be enough then, the 5 bits with invalid data can be removed either by shifting or masking.

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

TS mentioned he is a newbie with bascom so it will be good to show how to do it better.
But you are right : the LED stuff complicates and distracts from the actual problem.

When having a problem it is good practice to isolate it. this means : create a short as possible sample that still works (or should work). This is also true for the hardware.
For debugging you can use a 7-segment display but i would recommend to use the UART/serial port. that way you can simply use : PRINT "somevalue " ; wert
The help shows how to connect the TX pin to a max232 for connection to the PC.

spimove() might indeed work but a simple loop where you create the signals can do the job too. try to get a proper debug output first. then try hw SPI and if that does not work you can try the 'make your own signals' solution.

kimmi · Joined: 24 Feb 2006 Posts: 1922 Location: Denmark

MichaelB. · Joined: 04 May 2017 Posts: 58

I tryed also this version:

MWS · Joined: 22 Aug 2009 Posts: 2262

benoit · Joined: 24 Jul 2007 Posts: 177

HI
Just:
THE STATUT FOR PORT B5 AND PORT B6 ARE NOT DEFINED AS INPUT OR OUTPUT .
I don t know if it can change something.
thank you to tell
Very Happy

MWS · Joined: 22 Aug 2009 Posts: 2262

MWS · Joined: 22 Aug 2009 Posts: 2262

MichaelB. · Joined: 04 May 2017 Posts: 58

My messy Test/Learn Programm is more Logic to me Very Happy

The Programm from Kimmi didnt change anything.

I have here a Screenshot collection from the Sensor. The MISO line doesnt look Healthy at all Very Happy

In this case i use this Code: