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annotate lcdtest/showppm.c @ 151:d515cfbb3f39

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fc-simtool: hex string parsing: add minimum length parameter
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 07 Feb 2021 00:18:30 +0000
parents 1d8c499711f1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
17
43cc53581975 lcdtest: PPM image display implemented
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diff changeset
1 #include <stdio.h>
43cc53581975 lcdtest: PPM image display implemented
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2 #include <ctype.h>
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3 #include <stdlib.h>
19
f3671d3ad953 lcdtest: added cd command to avoid typing long pathnames for show
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diff changeset
4 #include <unistd.h>
17
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5
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6 char *ppm_filename;
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7 FILE *ppmfile;
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8 int ppm_is_ascii; /* P3 format instead of P6 */
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9
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10 /*
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11 * This function reads one ASCII-encoded integer from a PPM file.
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12 * It handles the white space and comment rules of the PPM format.
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13 */
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14 static int
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15 ppm_get_ascii_number()
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16 {
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17 int accum, c;
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18
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19 do {
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20 c = getc(ppmfile);
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21 if (c < 0) {
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22 badeof: fprintf(stderr, "%s: unexpected EOF\n", ppm_filename);
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23 return(-1);
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24 }
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25 if (c == '#') {
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26 do
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27 c = getc(ppmfile);
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28 while (c >= 0 && c != '\n');
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29 if (c != '\n')
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30 goto badeof;
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31 }
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32 } while (isspace(c));
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33 if (!isdigit(c)) {
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34 fprintf(stderr,
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35 "%s: unexpected data where a number was expected\n",
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36 ppm_filename);
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37 return(-1);
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38 }
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39 for (accum = c - '0'; ; ) {
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40 c = getc(ppmfile);
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41 if (c < 0 || isspace(c))
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42 break;
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43 if (!isdigit(c)) {
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44 fprintf(stderr,
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45 "%s: bad character in the middle of a number\n",
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46 ppm_filename);
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47 return(-1);
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48 }
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49 accum = accum * 10 + c - '0';
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50 }
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51 return accum;
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52 }
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53
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54 /*
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55 * This function reads and parses the PPM header of our input file.
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56 */
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57 static int
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58 ppm_read_header()
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59 {
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60 int magic1, magic2;
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61 int rd;
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62
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63 magic1 = getc(ppmfile);
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64 magic2 = getc(ppmfile);
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65 if (magic1 == 'P' && magic2 == '3')
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66 ppm_is_ascii = 1;
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67 else if (magic1 == 'P' && magic2 == '6')
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68 ppm_is_ascii = 0;
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69 else {
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70 fprintf(stderr, "%s: P3 or P6 format expected\n", ppm_filename);
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71 return(-1);
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72 }
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73 rd = ppm_get_ascii_number();
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74 if (rd < 0)
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75 return(-1);
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76 if (rd != 176) {
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77 fprintf(stderr, "%s: width is not 176\n", ppm_filename);
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78 return(-1);
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79 }
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80 rd = ppm_get_ascii_number();
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81 if (rd < 0)
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82 return(-1);
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83 if (rd != 220) {
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84 fprintf(stderr, "%s: height is not 220\n", ppm_filename);
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85 return(-1);
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86 }
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87 rd = ppm_get_ascii_number();
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88 if (rd < 0)
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89 return(-1);
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90 if (rd != 255) {
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91 fprintf(stderr, "%s: maxval is not 255\n", ppm_filename);
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92 return(-1);
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93 }
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94 return(0);
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95 }
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96
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97 /*
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98 * This function reads a single R, G or B value from a PPM file.
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99 */
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100 static int
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101 ppm_get_pixval()
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102 {
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103 int c;
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104
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105 if (ppm_is_ascii)
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106 return ppm_get_ascii_number();
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107 c = getc(ppmfile);
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108 if (c < 0) {
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109 fprintf(stderr, "%s: EOF while reading binary pixel data\n",
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110 ppm_filename);
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111 return(-1);
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112 }
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113 return c;
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114 }
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115
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116 static int
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117 ppm_get_rgb()
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118 {
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119 int r, g, b;
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120
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121 r = ppm_get_pixval();
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122 if (r < 0)
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123 return(-1);
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124 g = ppm_get_pixval();
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125 if (g < 0)
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126 return(-1);
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127 b = ppm_get_pixval();
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128 if (b < 0)
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129 return(-1);
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130 /* convert to 5:6:5 */
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131 r >>= 3;
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132 g >>= 2;
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133 b >>= 3;
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134 return (r << 11) | (g << 5) | b;
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135 }
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136
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137 cmd_show(argc, argv)
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138 char **argv;
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139 {
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140 int rc;
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141 unsigned n;
21
1d8c499711f1 lcdtest PPM display: sending the picture all at once is much faster
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142 u_char ftbuf[176*220*6+3], *dp;
17
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143
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144 ppm_filename = argv[1];
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145 ppmfile = fopen(ppm_filename, "r");
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146 if (!ppmfile) {
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147 perror(ppm_filename);
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148 return(-1);
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149 }
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150 rc = ppm_read_header();
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151 if (rc < 0) {
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152 fclose(ppmfile);
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153 return(-1);
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154 }
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155 write_ir(0x20);
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156 write_dr(0);
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157 write_ir(0x21);
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158 write_dr(0);
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159 write_ir(0x22);
21
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160 /* GPIO setup */
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161 dp = ftbuf;
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162 *dp++ = 0x82;
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163 *dp++ = 0x03;
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164 *dp++ = 0x03;
17
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165 for (n = 0; n < 176*220; n++) {
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166 rc = ppm_get_rgb();
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167 if (rc < 0) {
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168 fclose(ppmfile);
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169 return(-1);
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170 }
21
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171 /* upper byte */
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172 *dp++ = 0x92;
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173 *dp++ = 0; /* dummy addr */
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174 *dp++ = rc >> 8;
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175 /* lower byte */
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176 *dp++ = 0x92;
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177 *dp++ = 0; /* dummy addr */
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178 *dp++ = rc;
17
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179 }
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180 fclose(ppmfile);
21
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181 do_ftdi_write(ftbuf, sizeof ftbuf);
17
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182 return(0);
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183 }
19
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Mychaela Falconia <falcon@freecalypso.org>
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184
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185 cmd_cd(argc, argv)
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186 char **argv;
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187 {
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188 if (chdir(argv[1]) < 0) {
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189 perror(argv[1]);
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190 return(-1);
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191 }
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192 return(0);
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193 }