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cc2500 spi interfacing with pic

 
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ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Wed Sep 17, 2014 2:20 pm     Reply with quote
I always forget how to figure out the correct SPI mode and that's why I made a short lookup table:
Code:
// SPI modes overview.
// SPI Mode | MOTOROLA | MICROCHIP | CCS                          | Clock line idle | Data clocked in at
//----------------------------------------------------------------|-----------------|-------------------
//          | CPOL CPHA|  CKP CKE  |                              |                 |
//    0     |  0    0  |   0   1   | SPI_L_TO_H | SPI_XMIT_L_TO_H | low             | low to high edge
//    1     |  0    1  |   0   0   | SPI_L_TO_H                   | low             | high to low edge
//    2     |  1    0  |   1   1   | SPI_H_TO_L                   | high            | high to low edge
//    3     |  1    1  |   1   0   | SPI_H_TO_L | SPI_XMIT_L_TO_H | high            | low to high edge

Howto:
1) Look up the clock level in idle state.
2) Look up if the data is clocked in at the up-going or down-going edge.
3) Find SPI mode in the table.

When I look at page 22 of the referenced datasheet I see:
1) Clock in idle = low
2) Data is clocked in at up-going edge.
==> SPI mode = mode 0
That's different from PCM's example but the same as what you've figured out (CPOL=0, CKE=1), we just don't know if it's the same as what you put down in your program.
jsureshp



Joined: 22 Jul 2010
Posts: 1
Location: chennai

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CC2500 program with pic
PostPosted: Fri Mar 25, 2016 3:52 am     Reply with quote
Hi Namiz,

Please could you share the working program for CC2500 with PIC.
_________________
Suresh
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