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SPI c code problem

 
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Monk9514524
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SPI c code problem
PostPosted: Sat Oct 25, 2008 10:05 am     Reply with quote
The following was part of SPI code for PIC16F88
Code:
  for(x = 0 ; x < 8 ; x++)
    {
        SDI = outgoing_byte.7; //Put bit on SPI data bus
        outgoing_byte <<= 1; //Rotate byte 1 to the left

        SCL = 0; //Toggle the SPI clock
        SCL = 1;

        incoming_byte <<= 1; //Rotate byte 1 to the left
        incoming_byte.0 = SDO; //Read bit on SPI data bus
    }

I try to transfer it to be used on PIC18F452 with CCS,
but there are some problems such as the outgoing_byte.7.
It should be take as the highest bit of outgoing_byte
but I never see that before.

I don't know if that program can be accepted by CCS.
Otherwise how I can change that into my own ?
Thx for all your answer.
Monk666



Joined: 25 Oct 2008
Posts: 2

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SPI c code problem
PostPosted: Sat Oct 25, 2008 10:12 am     Reply with quote
Here is the original code for Triple Axis Accelerometer.

http://www.sparkfun.com/datasheets/Sensors/LIS3LV02DQ-Tester.zip

I am trying to transfer this code to be use in my PIC18F452 with CCS.
asmallri



Joined: 12 Aug 2004
Posts: 1634
Location: Perth, Australia

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PostPosted: Sat Oct 25, 2008 10:24 am     Reply with quote
If you are interested I sell a $20 driver for this sensor written in Microchip C30 for the PIC24 family using hardware SPI. It would be straight forward to port to CCS and I can assist you to do it.

In the my application the driver was used to scan X, Y & Z every 2ms (500Hz). The driver is capable of a higher sampling rate but I was also using a Magnetometer that was not capable of sampling faster.
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Regards, Andrew

http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!!
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Oct 25, 2008 2:34 pm     Reply with quote
Monk,
If you search the Sparkfun forum, you will find a driver by KamPutty:
http://forum.sparkfun.com/viewtopic.php?p=18666
Monk9514524
Guest
thanks for help~PCM programmer
PostPosted: Sun Oct 26, 2008 3:13 am     Reply with quote
Thanks for your kindness PCM programmer and KamPutty.

I was really troubled by this question for a period of time.

Now I can try to move on to next stage.
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