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Revision 1496

Added by John Sexton over 14 years ago

Reverted "libdragonfly" folder back to version before Init Checking was implemented and did "make dist" to recompile the library. BOM LEDs now shine
correctly.

View differences:

spi.c
6 6 
 **/
7 7 

  		




  8
  8
  
    
#include <avr/interrupt.h>


  		




  9
  
  
    

  		




  10
  
  
    
#include "dragonfly_defs.h"


  		




  11
  9
  
    
#include "spi.h"


  		




  12
  10
  
    

  		




  13
  
  
    
unsigned char spi_initd=0;


  		




  14
  11
  
    

  		




  15
  12
  
    
static volatile char spi_bytes; /* number of bytes to read */


  		




  16
  13
  
    
static spi_fun_recv_t spi_recv_func; /* byte handler */


  		




  ......




  21
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* 


  		




  22
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* @param recv_func The function to be called for each byte of data received.


  		




  23
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* @param recv_complete_func  The function to be called at the end of a complete transmission.


  		




  24
  
  
    
*


  		




  25
  
  
    
* @return 0 if init succesfull, an error code otherwise


  		




  26
  21
  
    
*/


  		




  27
  
  
    
int spi_init (spi_fun_recv_t recv_func, spi_fun_recv_complete_t recv_complete_func)


  		




  
  22
  
    
void spi_init (spi_fun_recv_t recv_func, spi_fun_recv_complete_t recv_complete_func)


  		




  28
  23
  
    
{


  		




  29
  
  
    
    if(spi_initd) {


  		




  30
  
  
    
      return ERROR_INIT_ALREADY_INITD;


  		




  31
  
  
    
    }


  		




  32
  
  
    

  		




  33
  24
  
    
    /*  Enable Interrupt, Enable SPI Module, MSB First, Master Mode, Clock div = 64 */


  		




  34
  25
  
    
    SPCR = _BV(SPE) | _BV(SPIE) /*| _BV(DORD)*/ | _BV(MSTR) | _BV(SPR1) | _BV(SPR0);


  		




  35
  26
  
    
    SPSR = _BV(SPI2X); 


  		




  ......




  46
  37
  
    
    spi_recv_complete_func = recv_complete_func;


  		




  47
  38
  
    
    spi_bytes = 0;


  		




  48
  39
  
    
    //usb_puts("\tspi.c Debug: SPI INITIALIZED\n");


  		




  49
  
  
    

  		




  50
  
  
    
    spi_initd=1;


  		




  51
  
  
    
    return 0;


  		




  52
  40
  
    
}


  		




  53
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  54
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/** 


  		




  ......




  56
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* 


  		




  57
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* @param bytes The number of bytes to be transferred.


  		




  58
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**/


  		




  59
  
  
    
int spi_transfer(char bytes)


  		




  
  47
  
    
void spi_transfer(char bytes)


  		




  60
  48
  
    
{


  		




  61
  
  
    
    if(!spi_initd)


  		




  62
  
  
    
      return ERROR_LIBRARY_NOT_INITD;


  		




  63
  
  
    

  		




  64
  49
  
    
    spi_bytes = bytes;


  		




  65
  50
  
    
    PORTB &= ~SS; /* Set SS low to initiate transmission */


  		




  66
  51
  
    
    SPDR = 0xff; /* Initiate data transmision */


  		




  67
  
  
    

  		




  68
  
  
    
    return 0;


  		




  69
  52
  
    
}


  		




  70
  53
  
    

  		




  71
  54
  
    
ISR(SIG_SPI) 


  		












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