PIC Micro Controller C Input / Output Routine

SPI Setup

by Peter Schutz

void init_spi_communication ( void )
 {
 TRISC4 = 1; //SPI Slave In
 TRISC5 = 0; //SPI Slave Out
 TRISC3 = 1; //SPI Slave CLK In
 TRISA5 = 1; //SPI SS Enabled In, used for other purpose then SPI
 SMP = 0; //SPI slave mode
 SSPEN = 1; //SPI port pins enabled
 SSPM0 = 0; //Slave Mode SS pin Disabled
 SSPM1 = 0;
 SSPM2 = 1;
 SSPM3 = 0;
 CKP = 1; //Clock idle is high
 CKE = 0; //Data on rising edge
 }
void main ( void )
 {
 hardware_init();
 initialize ();
 init_spi_communication (); // Initialization of SPI
 SSPBUF = 0x00; // Clear SPI receive buffer
 SSPIE = 1; // Enable interrupt on SPI receiving
 PEIE = 1; // Enable peripherial interrupt(For
SPI)
 ei(); // Global interrupt enable
 asm("sleep"); // Going to sleep
 while (1)
 ;
 }

Questions:

• Vinay of L&T asks: " I WANT TO USE RECEVIER IN INTERRUPT MODE AND RECEVIE VARIABLE LENGTH OF DATA CAN SOMEBODY SHARE SOME ROUTINES?"

Comments:

• lb07v at spamecs.soton.ac.uk

  Hi there!
  It's my first time in PicList!I'm working now on PIC16F687 and I'm looking for some application examples to set up SPI slave mode. I found very helpful information, and I'll be happy to accept further tips about that! Great site! LucaB

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