Projects/AVRISP/Lib/PDITarget.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, and distribute this software
  13   and its documentation for any purpose and without fee is hereby
  14   granted, provided that the above copyright notice appear in all
  15   copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 #if defined(ENABLE_XPROG_PROTOCOL)
  32
  33 /** \file
  34  *
  35  *  Target-related functions for the PDI Protocol decoder.
  36  */
  37
  38 #define  INCLUDE_FROM_PDITARGET_C
  39 #include "PDITarget.h"
  40
  41 void PDITarget_SendByte(uint8_t Byte)
  42 {
  43         PDIDATA_LINE_PORT  &= ~PDIDATA_LINE_MASK;
  44
  45         PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
  46         PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
  47
  48         for (uint8_t i = 0; i < 8; i++)
  49         {
  50                 if (Byte & 0x01)
  51                   PDIDATA_LINE_PORT |= PDIDATA_LINE_MASK;
  52                 else
  53                   PDIDATA_LINE_PORT &= ~PDIDATA_LINE_MASK;
  54
  55                 Byte >>= 1;
  56
  57                 PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
  58                 PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
  59         }
  60
  61         PDIDATA_LINE_PORT  |= PDIDATA_LINE_MASK;
  62
  63         PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
  64         PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
  65         PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
  66         PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
  67 }
  68
  69 uint8_t PDITarget_ReceiveByte(void)
  70 {
  71         uint8_t ReceivedByte = 0;
  72
  73         PDIDATA_LINE_DDR   &= ~PDIDATA_LINE_MASK;
  74
  75         bool FoundStartBit;
  76
  77         do
  78         {
  79                 PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
  80                 PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
  81                 FoundStartBit = !(PDIDATA_LINE_PIN & PDIDATA_LINE_MASK);
  82         } while (!FoundStartBit);
  83
  84         for (uint8_t i = 0; i < 8; i++)
  85         {
  86                 if (PDIDATA_LINE_PIN & PDIDATA_LINE_MASK)
  87                         ReceivedByte |= 0x01;
  88
  89                 ReceivedByte <<= 1;
  90
  91                 PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
  92                 PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
  93         }
  94
  95         PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
  96         PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
  97         PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
  98         PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
  99
 100         PDIDATA_LINE_DDR   |= PDIDATA_LINE_MASK;
 101
 102         return ReceivedByte;
 103 }
 104
 105 #endif