00001 /* Simple Logical Analyzer 00002 Copyright (C) 2001, 2002 Free Software Foundation, Inc. 00003 Written by Stephane Carrez (stcarrez@nerim.fr) 00004 00005 This file is free software; you can redistribute it and/or modify it 00006 under the terms of the GNU General Public License as published by the 00007 Free Software Foundation; either version 2, or (at your option) any 00008 later version. 00009 00010 In addition to the permissions in the GNU General Public License, the 00011 Free Software Foundation gives you unlimited permission to link the 00012 compiled version of this file with other programs, and to distribute 00013 those programs without any restriction coming from the use of this 00014 file. (The General Public License restrictions do apply in other 00015 respects; for example, they cover modification of the file, and 00016 distribution when not linked into another program.) 00017 00018 This file is distributed in the hope that it will be useful, but 00019 WITHOUT ANY WARRANTY; without even the implied warranty of 00020 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00021 General Public License for more details. 00022 00023 You should have received a copy of the GNU General Public License 00024 along with this program; see the file COPYING. If not, write to 00025 the Free Software Foundation, 59 Temple Place - Suite 330, 00026 Boston, MA 02111-1307, USA. */ 00027 00050 #include "analyzer.h" 00051 00052 #define TIMER_DIV (8192L) 00053 #define TIMER_TICK (M6811_CPU_E_CLOCK / TIMER_DIV) 00054 00055 /* Setup for a 8Mhz quartz, and prescaler set to 1 00056 (500ns period). */ 00057 #define USEC_PER_TICK (1) 00058 #define USEC_DIVISOR (2) 00059 00060 void 00061 collect_samples (sample_list_t *samples) 00062 { 00063 unsigned i; 00064 unsigned char current_port; 00065 sample_t *sample; 00066 00067 sample = samples->first; 00068 current_port = _io_ports[M6811_PORTA]; 00069 for (i = samples->length; i != 0; i--, sample++) { 00070 unsigned char c; 00071 00072 #ifdef TEST 00073 unsigned k = 0; 00074 #endif 00075 do { 00076 #ifdef TEST 00077 if (k == 0) { 00078 _io_ports[M6811_PORTA] ^= 0x80; 00079 } else { 00080 k++; 00081 } 00082 #endif 00083 c = current_port ^ _io_ports[M6811_PORTA]; 00084 } while (c == 0); 00085 sample->tick = get_timer_counter (); 00086 c = c ^ current_port; 00087 sample->port = c; 00088 current_port = c; 00089 } 00090 } 00091 00092 void 00093 report_samples (sample_list_t *samples) 00094 { 00095 sample_t *sample; 00096 unsigned i; 00097 sample_t *prev; 00098 00099 prev = samples->first; 00100 sample = &prev[1]; 00101 for (i = samples->length - 1; i != 0; i--, sample++) { 00102 unsigned dt; 00103 unsigned char c; 00104 unsigned long usec; 00105 00106 c = sample->port; 00107 dt = sample->tick - prev->tick; 00108 usec = (((unsigned long) dt) * USEC_PER_TICK) / USEC_DIVISOR; 00109 printf ("%lu %lu %c %c %c\n", 00110 (long) dt, usec, 00111 (int) (c & 1 ? '1' : '0'), 00112 (int) (c & 2 ? '1' : '0'), 00113 (int) (c & 4 ? '1' : '0')); 00114 prev = sample; 00115 } 00116 } 00117 00118 #define MAX_SAMPLES (256) 00119 00120 sample_t sample_buffer[MAX_SAMPLES]; 00121 00122 int 00123 main () 00124 { 00125 sample_list_t list; 00126 00127 serial_init (); 00128 00129 #ifdef TEST 00130 _io_ports[M6811_PACTL] |= M6811_DDRA7; 00131 #endif 00132 list.length = MAX_SAMPLES; 00133 list.first = sample_buffer; 00134 lock (); 00135 while (1) 00136 { 00137 collect_samples (&list); 00138 report_samples (&list); 00139 } 00140 }