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annotate cp2102/intel_hex_in.c @ 84:b36397a56bda

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doc/CP2102-EEPROM-format: small error in analysis
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 27 Sep 2023 18:38:10 +0000
parents 842cff427588
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
55
c0084bf153e5 cp2102: Intel HEX reading implemented
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This module implements a function for reading CP2102 EEPROM images
c0084bf153e5 cp2102: Intel HEX reading implemented
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3 * in the Intel HEX format which we've copied from cp210x-program-1.0,
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4 * the Python-language tool from 2014.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <ctype.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include <stdio.h>
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12 #include <stdlib.h>
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13 #include "cp210x_defs.h"
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14
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15 extern u_char eeprom[SIZE_EEPROM];
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16
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17 static int
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18 decode_hex_digit(c)
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19 {
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20 if (c >= '0' && c <= '9')
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21 return(c - '0');
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22 if (c >= 'A' && c <= 'F')
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23 return(c - 'A' + 10);
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24 if (c >= 'a' && c <= 'f')
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25 return(c - 'a' + 10);
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26 return(-1);
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27 }
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28
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29 static int
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30 decode_hex_byte(str)
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31 char *str;
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32 {
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33 int u, l;
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34
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35 u = decode_hex_digit(str[0]);
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36 l = decode_hex_digit(str[1]);
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37 return (u << 4) | l;
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38 }
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39
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40 void
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41 read_intel_hex(filename)
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42 char *filename;
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43 {
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44 FILE *inf;
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45 char linebuf[1024], *cp;
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46 int lineno;
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47 unsigned eeprom_offset;
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48 unsigned payload_len, record_len, n;
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49 u_char record[21], csum;
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50 unsigned record_addr, expect_addr;
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51
c0084bf153e5 cp2102: Intel HEX reading implemented
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52 inf = fopen(filename, "r");
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53 if (!inf) {
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54 perror(filename);
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55 exit(1);
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56 }
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57 eeprom_offset = 0;
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58 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
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59 if (!index(linebuf, '\n')) {
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60 fprintf(stderr,
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61 "%s line %d: too long or missing newline\n",
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62 filename, lineno);
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63 exit(1);
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64 }
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65 if (linebuf[0] != ':')
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66 continue;
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67 if (!isxdigit(linebuf[1]) || !isxdigit(linebuf[2])) {
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68 inv_record: fprintf(stderr,
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69 "%s line %d: invalid Intex HEX record\n",
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70 filename, lineno);
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71 exit(1);
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72 }
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73 payload_len = decode_hex_byte(linebuf + 1);
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74 if (payload_len > 16) {
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75 bad_payload_len: fprintf(stderr,
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76 "%s line %d: unsupported payload length\n",
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77 filename, lineno);
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78 exit(1);
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79 }
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80 record_len = payload_len + 5;
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81 cp = linebuf + 1;
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82 csum = 0;
56
842cff427588 cp2102: fix Intel HEX read/write bugs
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83 for (n = 0; n < record_len; n++) {
55
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84 if (!isxdigit(cp[0]) || !isxdigit(cp[1]))
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85 goto inv_record;
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86 record[n] = decode_hex_byte(cp);
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87 cp += 2;
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88 csum += record[n];
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89 }
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90 if (csum) {
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91 fprintf(stderr,
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92 "%s line %d: bad Intel HEX record checksum\n",
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93 filename, lineno);
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94 exit(1);
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95 }
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96 if (record[3] == 0x00) {
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97 if (payload_len != 16)
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98 goto bad_payload_len;
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99 if (eeprom_offset >= SIZE_EEPROM) {
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100 fprintf(stderr,
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101 "%s line %d: data continues past valid EEPROM size\n",
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102 filename, lineno);
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103 exit(1);
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104 }
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105 record_addr = (record[1] << 8) | record[2];
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106 expect_addr = EEPROM_START_ADDR + eeprom_offset;
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107 if (record_addr != expect_addr) {
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108 fprintf(stderr,
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109 "%s line %d: record addr is %04X, but we expect %04X\n",
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110 filename, lineno, record_addr,
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111 expect_addr);
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112 exit(1);
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113 }
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114 bcopy(record + 4, eeprom + eeprom_offset, 16);
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115 eeprom_offset += 16;
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116 } else if (record[3] == 0x01) {
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117 if (payload_len) {
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118 fprintf(stderr,
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119 "%s line %d: nonzero payload length in end-marker record\n",
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120 filename, lineno);
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121 exit(1);
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122 }
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123 if (eeprom_offset < SIZE_EEPROM) {
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124 fprintf(stderr,
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125 "%s line %d: end-marker without full data\n",
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126 filename, lineno);
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127 exit(1);
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128 }
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129 break;
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130 } else {
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131 fprintf(stderr,
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132 "%s line %d: unsupported Intel HEX record type\n",
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133 filename, lineno);
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134 exit(1);
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135 }
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136 }
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137 fclose(inf);
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138 if (!eeprom_offset) {
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139 fprintf(stderr, "error: no Intel HEX EEPROM data found in %s\n",
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140 filename);
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141 exit(1);
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142 }
c0084bf153e5 cp2102: Intel HEX reading implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 if (eeprom_offset < SIZE_EEPROM) {
c0084bf153e5 cp2102: Intel HEX reading implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
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144 fprintf(stderr, "error: %s contains truncated data\n",
c0084bf153e5 cp2102: Intel HEX reading implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
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145 filename);
c0084bf153e5 cp2102: Intel HEX reading implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
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146 exit(1);
c0084bf153e5 cp2102: Intel HEX reading implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
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147 }
c0084bf153e5 cp2102: Intel HEX reading implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
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148 }