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annotate packages/redboot/current/src/xyzModem.c @ 165:d63db767121d

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Merge from eCos master repository on 2001-06-29-06:43:03-BST
author jlarmour
date Fri, 29 Jun 2001 07:16:25 +0000
parents 2395031e7a66
children 38892b97b685
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1 //==========================================================================
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2 //
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3 // xyzModem.c
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4 //
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5 // RedBoot stream handler for xyzModem protocol
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000, 2001 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): gthomas
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35 // Contributors: gthomas
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36 // Date: 2000-07-14
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37 // Purpose:
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38 // Description:
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39 //
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40 // This code is part of RedBoot (tm).
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41 //
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42 //####DESCRIPTIONEND####
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43 //
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44 //==========================================================================
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45
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46 #include <redboot.h>
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47 #include <xyzModem.h>
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48
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49 // Assumption - run xyzModem protocol over the console port
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50
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51 // Values magic to the protocol
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52 #define SOH 0x01
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53 #define STX 0x02
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54 #define EOT 0x04
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55 #define ACK 0x06
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56 #define NAK 0x15
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57 #define CAN 0x18
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58
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59 // Data & state local to the protocol
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60 static struct {
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61 hal_virtual_comm_table_t* __chan;
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62 unsigned char pkt[1024], *bufp;
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63 unsigned char blk,cblk,crc1,crc2;
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64 unsigned char next_blk; // Expected block
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65 int len, mode, total_retries;
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66 int total_SOH, total_STX, total_CAN;
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67 bool crc_mode, at_eof;
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68 } xyz;
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69
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70 #define xyzModem_CHAR_TIMEOUT 2000 // 2 seconds
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71 #define xyzModem_MAX_RETRIES 20
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72 #define xyzModem_MAX_RETRIES_WITH_CRC 10
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73 #define xyzModem_CAN_COUNT 3 // Wait for 3 CAN before quitting
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74
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75 #ifdef DEBUG
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76 #ifndef USE_SPRINTF
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77 //
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78 // Note: this debug setup only works if the target platform has two serial ports
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79 // available so that the other one (currently only port 1) can be used for debug
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80 // messages.
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81 //
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82 static int
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83 zm_dprintf(char *fmt, ...)
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84 {
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85 int cur_console;
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86 va_list args;
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87
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88 va_start(args, fmt);
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89 cur_console = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);
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90 CYGACC_CALL_IF_SET_CONSOLE_COMM(1);
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91 vprintf(fmt, args);
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92 CYGACC_CALL_IF_SET_CONSOLE_COMM(cur_console);
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93 }
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94
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95 static void
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96 zm_flush(void)
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97 {
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98 }
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99
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100 #else
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101 //
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102 // Note: this debug setup works by storing the strings in a fixed buffer
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103 //
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104 static char *zm_out = (char *)0x00380000;
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105 static char *zm_out_start = (char *)0x00380000;
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106
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107 static int
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108 zm_dprintf(char *fmt, ...)
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109 {
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110 int len;
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111 va_list args;
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112
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113 va_start(args, fmt);
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114 len = vsprintf(zm_out, fmt, args);
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115 zm_out += len;
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116 return len;
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117 }
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118
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119 static void
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120 zm_flush(void)
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121 {
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122 char *p = zm_out_start;
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123 while (*p) mon_write_char(*p++);
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124 zm_out = zm_out_start;
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125 }
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126 #endif
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127
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128 static void
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129 zm_dump_buf(void *buf, int len)
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130 {
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131 vdump_buf_with_offset(zm_dprintf, buf, len, 0);
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132 }
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133
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134 static unsigned char zm_buf[2048];
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135 static unsigned char *zm_bp;
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136
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137 static void
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138 zm_new(void)
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139 {
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140 zm_bp = zm_buf;
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141 }
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142
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143 static void
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144 zm_save(unsigned char c)
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145 {
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146 *zm_bp++ = c;
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147 }
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148
149
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149 static void
138
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150 zm_dump(int line)
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151 {
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152 zm_dprintf("Packet at line: %d\n", line);
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153 zm_dump_buf(zm_buf, zm_bp-zm_buf);
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154 }
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155
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156 #define ZM_DEBUG(x) x
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157 #else
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158 #define ZM_DEBUG(x)
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159 #endif
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160
132
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161 // Wait for the line to go idle
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162 static void
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163 xyzModem_flush(void)
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164 {
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165 int res;
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166 char c;
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167 while (true) {
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168 res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &c);
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169 if (!res) return;
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170 }
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171 }
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172
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173 static int
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174 xyzModem_get_hdr(void)
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175 {
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176 char c;
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177 int res;
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178 bool hdr_found = false;
162
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179 int i, can_total, hdr_chars;
132
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180 unsigned short cksum;
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181
138
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182 ZM_DEBUG(zm_new());
132
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183 // Find the start of a header
162
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184 can_total = 0;
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185 hdr_chars = 0;
132
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186 while (!hdr_found) {
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187 res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &c);
138
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188 ZM_DEBUG(zm_save(c));
132
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189 if (res) {
162
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190 hdr_chars++;
132
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191 switch (c) {
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192 case SOH:
143
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193 xyz.total_SOH++;
132
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194 case STX:
143
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195 if (c == STX) xyz.total_STX++;
132
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196 hdr_found = true;
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197 break;
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198 case CAN:
143
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199 xyz.total_CAN++;
138
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200 ZM_DEBUG(zm_dump(__LINE__));
162
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201 if (++can_total == xyzModem_CAN_COUNT) {
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202 return xyzModem_cancel;
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203 } else {
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204 // Wait for multiple CAN to avoid early quits
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205 break;
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206 }
132
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207 case EOT:
165
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208 // EOT only supported if no noise
162
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209 if (hdr_chars == 1) {
165
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210 CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
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211 ZM_DEBUG(zm_dprintf("ACK on EOT #%d\n", __LINE__));
162
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212 ZM_DEBUG(zm_dump(__LINE__));
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213 return xyzModem_eof;
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214 }
132
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215 default:
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216 // Ignore, waiting for start of header
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217 }
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218 } else {
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219 // Data stream timed out
162
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220 xyzModem_flush(); // Toss any current input
149
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221 ZM_DEBUG(zm_dump(__LINE__));
162
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222 CYGACC_CALL_IF_DELAY_US((cyg_int32)250000);
132
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223 return xyzModem_timeout;
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224 }
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225 }
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226
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227 // Header found, now read the data
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228 res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &xyz.blk);
138
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229 ZM_DEBUG(zm_save(xyz.blk));
132
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230 if (!res) {
149
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231 ZM_DEBUG(zm_dump(__LINE__));
132
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232 return xyzModem_timeout;
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233 }
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234 res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &xyz.cblk);
138
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235 ZM_DEBUG(zm_save(xyz.cblk));
132
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236 if (!res) {
149
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237 ZM_DEBUG(zm_dump(__LINE__));
132
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238 return xyzModem_timeout;
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239 }
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240 xyz.len = (c == SOH) ? 128 : 1024;
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241 xyz.bufp = xyz.pkt;
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242 for (i = 0; i < xyz.len; i++) {
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243 res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &c);
138
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244 ZM_DEBUG(zm_save(c));
132
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245 if (res) {
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246 xyz.pkt[i] = c;
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247 } else {
149
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248 ZM_DEBUG(zm_dump(__LINE__));
132
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249 return xyzModem_timeout;
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250 }
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251 }
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252 res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &xyz.crc1);
138
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253 ZM_DEBUG(zm_save(xyz.crc1));
132
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254 if (!res) {
149
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255 ZM_DEBUG(zm_dump(__LINE__));
132
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256 return xyzModem_timeout;
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257 }
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258 if (xyz.crc_mode) {
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259 res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &xyz.crc2);
138
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260 ZM_DEBUG(zm_save(xyz.crc2));
132
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261 if (!res) {
149
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262 ZM_DEBUG(zm_dump(__LINE__));
132
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263 return xyzModem_timeout;
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264 }
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265 }
138
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266 ZM_DEBUG(zm_dump(__LINE__));
132
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267 // Validate the message
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268 if ((xyz.blk ^ xyz.cblk) != (unsigned char)0xFF) {
138
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269 ZM_DEBUG(zm_dprintf("Framing error - blk: %x/%x/%x\n", xyz.blk, xyz.cblk, (xyz.blk ^ xyz.cblk)));
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270 ZM_DEBUG(zm_dump_buf(xyz.pkt, xyz.len));
132
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271 xyzModem_flush();
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272 return xyzModem_frame;
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273 }
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274 // Verify checksum/CRC
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275 if (xyz.crc_mode) {
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276 cksum = crc16(xyz.pkt, xyz.len);
132
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277 if (cksum != ((xyz.crc1 << 8) | xyz.crc2)) {
138
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278 ZM_DEBUG(zm_dprintf("CRC error - recvd: %02x%02x, computed: %x\n",
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279 xyz.crc1, xyz.crc2, cksum & 0xFFFF));
132
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280 return xyzModem_cksum;
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281 }
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282 } else {
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283 cksum = 0;
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284 for (i = 0; i < xyz.len; i++) {
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285 cksum += xyz.pkt[i];
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286 }
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diff changeset
287 if (xyz.crc1 != (cksum & 0xFF)) {
138
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288 ZM_DEBUG(zm_dprintf("Checksum error - recvd: %x, computed: %x\n", xyz.crc1, cksum & 0xFF));
132
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289 return xyzModem_cksum;
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290 }
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291 }
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292 // If we get here, the message passes [structural] muster
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293 return 0;
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294 }
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diff changeset
295
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diff changeset
296 int
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297 xyzModem_stream_open(char *filename, int mode, int *err)
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298 {
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299 int console_chan, stat;
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300 int retries = xyzModem_MAX_RETRIES;
138
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301 int crc_retries = xyzModem_MAX_RETRIES_WITH_CRC;
132
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302
162
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303 ZM_DEBUG(zm_out = zm_out_start);
132
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304 if (mode == xyzModem_zmodem) {
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305 *err = xyzModem_noZmodem;
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306 return -1;
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307 }
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308
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309 // Set up the I/O channel. Note: this allows for using a different port in the future
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310 console_chan = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);
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311 CYGACC_CALL_IF_SET_CONSOLE_COMM(console_chan);
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312 xyz.__chan = CYGACC_CALL_IF_CONSOLE_PROCS();
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313 CYGACC_CALL_IF_SET_CONSOLE_COMM(console_chan);
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314 CYGACC_COMM_IF_CONTROL(*xyz.__chan, __COMMCTL_SET_TIMEOUT, xyzModem_CHAR_TIMEOUT);
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315 xyz.len = 0;
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316 xyz.crc_mode = true;
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317 xyz.at_eof = false;
138
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diff changeset
318 xyz.mode = mode;
143
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319 xyz.total_retries = 0;
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320 xyz.total_SOH = 0;
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321 xyz.total_STX = 0;
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diff changeset
322 xyz.total_CAN = 0;
132
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323
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324 while (retries-- > 0) {
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325 stat = xyzModem_get_hdr();
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326 if (stat == 0) {
138
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diff changeset
327 if (xyz.blk == 0) {
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328 // Note: yModem file name data blocks quietly discarded
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329 CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
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330 }
132
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331 xyz.next_blk = 1;
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332 xyz.len = 0;
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333 return 0;
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334 } else
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335 if (stat == xyzModem_timeout) {
138
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336 if (--crc_retries <= 0) xyz.crc_mode = false;
132
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337 CYGACC_CALL_IF_DELAY_US(5*100000); // Extra delay for startup
138
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338 CYGACC_COMM_IF_PUTC(*xyz.__chan, (xyz.crc_mode ? 'C' : NAK));
143
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339 xyz.total_retries++;
138
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340 ZM_DEBUG(zm_dprintf("NAK (%d)\n", __LINE__));
132
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341 }
143
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342 if (stat == xyzModem_cancel) {
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343 break;
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344 }
132
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345 }
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346 *err = stat;
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347 ZM_DEBUG(zm_flush());
132
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348 return -1;
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349 }
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350
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351 int
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352 xyzModem_stream_read(char *buf, int size, int *err)
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353 {
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354 int stat, total, len;
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355 int retries;
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356
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357 total = 0;
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358 // Try and get 'size' bytes into the buffer
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359 while (!xyz.at_eof && (size > 0)) {
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diff changeset
360 if (xyz.len == 0) {
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361 retries = xyzModem_MAX_RETRIES;
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362 while (retries-- > 0) {
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363 stat = xyzModem_get_hdr();
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364 if (stat == 0) {
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365 if (xyz.blk == xyz.next_blk) {
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366 CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
162
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367 ZM_DEBUG(zm_dprintf("ACK block %d (%d)\n", xyz.blk, __LINE__));
132
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368 xyz.next_blk = (xyz.next_blk + 1) & 0xFF;
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369 break;
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370 } else if (xyz.blk == ((xyz.next_blk - 1) & 0xFF)) {
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371 // Just re-ACK this so sender will get on with it
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372 CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
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373 continue; // Need new header
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374 } else {
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375 stat = xyzModem_sequence;
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diff changeset
376 }
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377 }
143
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diff changeset
378 if (stat == xyzModem_cancel) {
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diff changeset
379 break;
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380 }
132
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381 if (stat == xyzModem_eof) {
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382 CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
138
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383 ZM_DEBUG(zm_dprintf("ACK (%d)\n", __LINE__));
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384 if (xyz.mode == xyzModem_ymodem) {
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385 CYGACC_COMM_IF_PUTC(*xyz.__chan, (xyz.crc_mode ? 'C' : NAK));
143
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386 xyz.total_retries++;
138
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387 stat = xyzModem_get_hdr();
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388 CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
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389 ZM_DEBUG(zm_dprintf("ACK (%d)\n", __LINE__));
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390 }
132
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391 xyz.at_eof = true;
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392 break;
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393 }
138
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394 CYGACC_COMM_IF_PUTC(*xyz.__chan, (xyz.crc_mode ? 'C' : NAK));
143
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395 xyz.total_retries++;
138
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396 ZM_DEBUG(zm_dprintf("NAK (%d)\n", __LINE__));
132
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397 }
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diff changeset
398 if (stat < 0) {
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399 *err = stat;
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400 xyz.len = -1;
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401 return total;
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diff changeset
402 }
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diff changeset
403 }
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diff changeset
404 len = xyz.len;
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diff changeset
405 if (size < len) len = size;
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diff changeset
406 memcpy(buf, xyz.bufp, len);
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diff changeset
407 size -= len;
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parents:
diff changeset
408 buf += len;
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diff changeset
409 total += len;
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diff changeset
410 xyz.len -= len;
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diff changeset
411 xyz.bufp += len;
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parents:
diff changeset
412 }
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diff changeset
413 return total;
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jlarmour
parents:
diff changeset
414 }
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parents:
diff changeset
415
143
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diff changeset
416 void
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diff changeset
417 xyzModem_stream_close(int *err)
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diff changeset
418 {
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419 printf("xyzModem - %s mode, %d(SOH)/%d(STX)/%d(CAN) packets, %d retries\n",
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420 xyz.crc_mode ? "CRC" : "Cksum",
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diff changeset
421 xyz.total_SOH, xyz.total_STX, xyz.total_CAN,
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diff changeset
422 xyz.total_retries);
162
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423 // ZM_DEBUG(zm_flush());
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424 }
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425
132
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426 char *
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427 xyzModem_error(int err)
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428 {
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429 switch (err) {
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430 case xyzModem_access:
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431 return "Can't access file";
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432 break;
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433 case xyzModem_noZmodem:
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434 return "Sorry, zModem not available yet";
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435 break;
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436 case xyzModem_timeout:
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437 return "Timed out";
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438 break;
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439 case xyzModem_eof:
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440 return "End of file";
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441 break;
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442 case xyzModem_cancel:
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443 return "Cancelled";
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444 break;
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445 case xyzModem_frame:
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446 return "Invalid framing";
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447 break;
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448 case xyzModem_cksum:
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449 return "CRC/checksum error";
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450 break;
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451 case xyzModem_sequence:
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452 return "Block sequence error";
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453 break;
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454 default:
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455 return "Unknown error";
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456 break;
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457 }
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458 }