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Sonsivri > Electronics > AVR, 8051 Family and ARM Area (Moderator: bbarney) > problem with spi !
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omidsht
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« on: July 27, 2008, 08:30:28 08:30 »
Hi , i have written a program with fastavr compiler to use spi ,
but if i coonect to SS pins of both avr together it works fine , but when i connect the SS pin of master avr to vcc and SS pin of slave avr to Ground , it does not work or it gets wrong numbers !?! why ?
(i do this because maybe i want to use multi slvae avrs)
please help me !
thanks in advance
OMID Huh
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bezobraznic
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« Reply #1 on: July 27, 2008, 09:01:36 09:01 »
In master mode, leave SS pin unconnected and configure as an output.
« Last Edit: July 27, 2008, 09:16:09 09:16 by bezobraznic » Logged
Codeman
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« Reply #2 on: September 05, 2008, 09:08:14 21:08 »
Forget about SS on master. SS means "slave select" and is used when the master is used as slave. The way to select other slaves is use other pins (any pins) and configure them as outputs. Then used them to select other slaves.

Good luck
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