FreeCalypso > hg > fc-usbser-tools

annotate duart28/eeprom_rd.c @ 93:a1df83d04cc9

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artifacts: rename Pirelli-CP2102 to Pirelli-CP2102-image
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 28 Sep 2023 01:44:24 +0000
parents 8de3891460db
children
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29
a7393d00996a fc-duart28-conf: implement check-eeprom
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1 /*
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2 * This module implements the steps of reading and validating the starting
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3 * EEPROM content.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include <usb.h>
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12 #include "../libftmini/eeprom_func.h"
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13
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14 u_short eeprom[64];
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15
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16 void
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17 read_eeprom(usbh)
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18 usb_dev_handle *usbh;
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19 {
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20 unsigned n;
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21
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22 for (n = 0; n < 64; n++)
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23 eeprom[n] = ftmini_read_eeprom_loc(usbh, n);
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24 }
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25
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26 static void
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27 verify_nonblank()
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28 {
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29 unsigned n;
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30
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31 for (n = 0; n < 64; n++) {
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32 if (eeprom[n] != 0xFFFF)
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33 return;
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34 }
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35 fprintf(stderr, "error: EEPROM is blank (erased?)\n");
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36 exit(1);
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37 }
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38
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39 static void
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40 verify_eeprom_chksum()
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41 {
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42 u_short chksum = 0xAAAA;
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43 unsigned n;
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44
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45 for (n = 0; n < 64; n++) {
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46 chksum ^= eeprom[n];
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47 chksum = (chksum << 1) | (chksum >> 15);
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48 }
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49 if (chksum == 0)
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50 return;
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51 fprintf(stderr, "error: EEPROM checksum is wrong\n");
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52 exit(1);
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53 }
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54
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55 static int
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56 check_req_match()
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57 {
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58 if (eeprom[0] != 0x0808)
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59 return 0;
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60 if (eeprom[1] != 0x0403)
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61 return 0;
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62 if (eeprom[2] != 0x6010 && eeprom[2] != 0x7152)
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63 return 0;
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64 if (eeprom[3] != 0x0500)
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65 return 0;
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66 if (eeprom[4] != 0x3280)
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67 return 0;
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68 if (eeprom[5] != 0x0000 && eeprom[5] != 0x0008)
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69 return 0;
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70 if (eeprom[6] != 0x0200)
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71 return 0;
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72 if (eeprom[7] != 0x1896)
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73 return 0;
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74 if (eeprom[8] != 0x12AE)
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75 return 0;
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76 if (eeprom[10] != 0x0046)
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77 return 0;
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78 if (eeprom[11] != 0x0318)
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79 return 0;
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80 if (eeprom[12] != 'F')
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81 return 0;
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82 if (eeprom[13] != 'r')
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83 return 0;
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84 if (eeprom[14] != 'e')
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85 return 0;
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86 if (eeprom[15] != 'e')
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87 return 0;
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88 if (eeprom[16] != 'C')
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89 return 0;
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90 if (eeprom[17] != 'a')
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91 return 0;
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92 if (eeprom[18] != 'l')
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93 return 0;
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94 if (eeprom[19] != 'y')
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95 return 0;
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96 if (eeprom[20] != 'p')
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97 return 0;
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98 if (eeprom[21] != 's')
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99 return 0;
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100 if (eeprom[22] != 'o')
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101 return 0;
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102 if (eeprom[23] != 0x0312)
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103 return 0;
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104 if (eeprom[24] != 'D')
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105 return 0;
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106 if (eeprom[25] != 'U')
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107 return 0;
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108 if (eeprom[26] != 'A')
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109 return 0;
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110 if (eeprom[27] != 'R')
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111 return 0;
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112 if (eeprom[28] != 'T')
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113 return 0;
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114 if (eeprom[29] != '2')
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115 return 0;
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116 if (eeprom[30] != '8')
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117 return 0;
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118 if (eeprom[31] != 'C' && eeprom[31] != 'S')
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119 return 0;
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120 return 1;
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121 }
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122
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123 analyze_eeprom()
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124 {
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125 verify_nonblank();
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126 verify_eeprom_chksum();
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127 if (!check_req_match()) {
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128 fprintf(stderr,
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129 "error: EEPROM content does not match FC DUART28\n");
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130 exit(1);
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131 }
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132 if (eeprom[2] == 0x7152 && eeprom[31] == 'C') {
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133 printf("EEPROM is programmed for DUART28C\n");
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134 return 'C';
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135 }
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136 if (eeprom[2] == 0x6010 && eeprom[31] == 'S') {
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137 printf("EEPROM is programmed for DUART28S\n");
30
8de3891460db duart28/eeprom_rd.c: fix analyze_eeprom() return value
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138 return 'S';
29
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139 }
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140 printf("EEPROM is inconsistent between C and S configs!\n");
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141 return '?';
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142 }