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MC9S12XEP100 SPI function

Question asked by Francois DUGUE on Oct 8, 2010
Latest reply on Oct 8, 2010 by Francois DUGUE

Hi all
I have some difficult with the SPI...
I havealready made some on colfire or HCS08 without problem...

 

 

// Configuration
// Bus clock = 48MHZ.
// We want SPI: 4MHz, Master mode, without drive of SS.

SPI1CR1 = 0b01010000 ;
SPI1CR2 = 0b00001000 ;
SPI1BR = 0b01010000 ;



//Function Send

U8 mcubind_Spi_8_bits_Send(U8 data)
   {
   debug_spi_data = data ;
   while(SPI1SR_SPTEF==0)
      {
      }
   spi_msg_count ++ ;
   SPI1DRL = data ;
   while(SPI1SR_SPIF==0)
      {
      } 
   return SPI1DRL  ;
   }




For the test, I made an infinit while() where i send 0x55.
(normaly, I'll have 4MHz div by 2).

But i have nothing.

I can see my counteur change, but i have nothing on MOSI1 or SCK1...
In addition, SPI1DRL always egal 0xff...

Do you have any ideas?

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