picoproj.c

   1 /* picoproj - communication with AM7xxx based USB pico projectors
   2  *
   3  * Copyright (C) 2011  Antonio Ospite <ospite@studenti.unina.it>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <stdint.h>
  22 #include <string.h>
  23 #include <endian.h>
  24 #include <errno.h>
  25
  26 typedef enum {
  27         AM7x01_PACKET_TYPE_INIT    = 0x01,
  28         AM7x01_PACKET_TYPE_IMAGE   = 0x02,
  29         AM7x01_PACKET_TYPE_POWER   = 0x04,
  30         AM7x01_PACKET_TYPE_UNKNOWN = 0x05,
  31 } am7x01_packet_type;
  32
  33 typedef enum {
  34         AM7x01_IMAGE_FORMAT_JPEG = 1,
  35 } am7x01_image_format;
  36
  37 typedef enum {
  38         AM7x01_POWER_OFF  = 0,
  39         AM7x01_POWER_LOW  = 1,
  40         AM7x01_POWER_MID  = 2,
  41         AM7x01_POWER_HIGH = 3,
  42 } am7x01_power_mode;
  43
  44 struct image_header {
  45         uint32_t format;
  46         uint32_t width;
  47         uint32_t height;
  48         uint32_t image_size;
  49 };
  50
  51 struct power_header {
  52         uint32_t power_low;
  53         uint32_t power_mid;
  54         uint32_t power_high;
  55 };
  56
  57 /*
  58  * Examples of packet headers:
  59  *
  60  * Image widget:
  61  * +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  62  * +02|00|00|00|00|10|3e|10|01|00|00|00|20|03|00|00|e0|01|00|00|53|E8|00|00+
  63  * +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  64  *
  65  * Brightness widget:
  66  * +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  67  * +04|00|00|00|00|0c|ff|ff|00|00|00|00|00|00|00|00|00|00|00|00|00|00|00|00+
  68  * +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  69  */
  70
  71 static uint8_t reference_image_header[] = {
  72         0x02, 0x00, 0x00, 0x00,
  73         0x00,
  74         0x10,
  75         0x3e,
  76         0x10,
  77         0x01, 0x00, 0x00, 0x00,
  78         0x20, 0x03, 0x00, 0x00,
  79         0xe0, 0x01, 0x00, 0x00,
  80         0x53, 0xE8, 0x00, 0x00
  81 };
  82
  83 struct header {
  84         uint32_t packet_type;
  85         uint8_t unknown0;
  86         uint8_t header_len;
  87         uint8_t unknown2;
  88         uint8_t unknown3;
  89         union {
  90                 struct image_header image;
  91                 struct power_header power;
  92         } header_data;
  93 };
  94
  95
  96 static void dump_image_header(struct image_header *i)
  97 {
  98         if (i == NULL)
  99                 return;
 100
 101         printf("Image header:\n");
 102         printf("format:      0x%08x (%u)\n", i->format, i->format);
 103         printf("width:       0x%08x (%u)\n", i->width, i->width);
 104         printf("height:      0x%08x (%u)\n", i->height, i->height);
 105         printf("image size:  0x%08x (%u)\n", i->image_size, i->image_size);
 106 }
 107
 108 static void dump_header(struct header *h)
 109 {
 110         if (h == NULL)
 111                 return;
 112
 113         printf("packet_type: 0x%08x (%u)\n", h->packet_type, h->packet_type);
 114         printf("unknown0:    0x%02hhx (%hhu)\n", h->unknown0, h->unknown0);
 115         printf("header_len:  0x%02hhx (%hhu)\n", h->header_len, h->header_len);
 116         printf("unknown2:    0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
 117         printf("unknown3:    0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
 118
 119         switch(h->packet_type) {
 120         case AM7x01_PACKET_TYPE_IMAGE:
 121                 dump_image_header(&(h->header_data.image));
 122                 break;
 123
 124         default:
 125                 printf("Packet type not supported!\n");
 126                 break;
 127         }
 128
 129         fflush(stdout);
 130 }
 131
 132 static void dump_buffer(uint8_t *buffer, unsigned int len)
 133 {
 134         unsigned int i;
 135
 136         if (buffer == NULL || len == 0)
 137                 return;
 138
 139         for (i = 0; i < len; i++) {
 140                 printf("%02hhX%c", buffer[i], (i < len - 1) ? ' ' : '\n');
 141         }
 142         fflush(stdout);
 143 }
 144
 145 static int send_data(uint8_t *buffer, unsigned int len)
 146 {
 147         dump_buffer(buffer, len);
 148         return 0;
 149 }
 150
 151 static int send_header(struct header *h)
 152 {
 153         union {
 154                 struct header header;
 155                 uint8_t buffer[sizeof (struct header)];
 156         } data;
 157
 158         data.header = *h;
 159
 160         return send_data(data.buffer, sizeof (struct header));
 161 }
 162
 163 static int send_image(am7x01_image_format format,
 164                       unsigned int width,
 165                       unsigned int height,
 166                       uint8_t *image,
 167                       unsigned int size)
 168 {
 169         int ret;
 170         struct header h = {
 171                 .packet_type = htole32(AM7x01_PACKET_TYPE_IMAGE),
 172                 .unknown0    = 0x00,
 173                 .header_len  = sizeof(struct image_header),
 174                 .unknown2    = 0x3e,
 175                 .unknown3    = 0x10,
 176                 .header_data = {
 177                         .image = {
 178                                 .format     = htole32(format),
 179                                 .width      = htole32(width),
 180                                 .height     = htole32(height),
 181                                 .image_size = htole32(size),
 182                         },
 183                 },
 184         };
 185
 186         dump_header(&h);
 187         printf("\n");
 188
 189         printf("Dump Buffers\n");
 190         dump_buffer(reference_image_header, sizeof(struct header));
 191
 192         ret = send_header(&h);
 193         if (ret < 0)
 194                 return ret;
 195
 196         if (image == NULL || size == 0)
 197                 return 0;
 198
 199         return send_data(image, size);
 200 }
 201
 202
 203 int main(int argc, char *argv[])
 204 {
 205         int ret;
 206
 207         ret = send_image(AM7x01_IMAGE_FORMAT_JPEG, 800, 480, 59475);
 208         if (ret < 0) {
 209                 perror("send_image");
 210                 exit(EXIT_FAILURE);
 211         }
 212         exit(EXIT_SUCCESS);
 213 }