Subject:
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SPI problems
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 16 Jul 1998 21:51:10 GMT
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Original-From:
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Ilya <ilya@flight.uchicago.edu!stopspam!>
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Viewed:
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1115 times
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I am trying to connect my Handyboard with a Motorola 68HC11A1FN chip
inside with a AD7858L- 12-bit ADC.
In my IC code I first write to the DDRD (Port D Data Direction Register)
($1009) and activate SCK(bit4), MOSI(bit3), MISO(bit2).
Then I write to SPCR (SPI Control Register and set bits 7(SPIE), 6(SPE),
4(MSTR), 2(CPHA), 1(SPR1).
Following I use serial_putchar() from the serialio.c library to initialize
the ADC... so far so good... no errors reported...
The ADC then is supposed to make a conversion and relay the data back to
the Handyboard via SPI. I use serial_getchar()
v1 =(float)serial_getchar();
and the Handyboard crashes.. at least the heart on the LCD stops beating..
serialio.c is loaded on my handyboard! Was the serialio.c library written
for SPI?!?! If not then I guess I found my problem.. but if it is for SPI,
what am I doing wrong? Are my addresses correct?
Can someone please tellme the right addresses for the following:
DDRD, SPCR SPSR, SPDR.
I have read various Motorola documentations and have not came out with a
distinct answer for my HC11A1FN chip. I have also found contradicting
values for the HC11 family so I am completly lost! The program did not
work when I tried to manually receive/send data through SPI.
Please help!
All of the requests will be kindly appreciated!
Thanks in advance
Ilya
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Message has 1 Reply:
 | | RE: SPI problems
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| Serial libraries are wwriten for Serial port,not for SPI port! Are you needing use the spi like a standard oitput port or like a SPI (synchronus serial port)???? Is the device spi compatiible? If yes, you need the portd to work like a SPI port. if (...) (26 years ago, 19-Jul-98, to lugnet.robotics.handyboard)
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