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edid
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Commiting work done so far

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Maximilian Stiefel 5 years ago
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e71128eb39
commit
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4 changed files with 324 additions and 0 deletions
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  1. 3
      .gitmodules
  2. 20
      edid.json
  3. 1
      frozen
  4. 300
      main.c

3
.gitmodules
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[submodule "frozen"]
path = frozen
url = https://github.com/cesanta/frozen.git

20
edid.json
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{
"header": {
"manufacturer_id": "GSM",
"product_code": 22997,
"serial_number": 607492,
"week_of_manufacture": 3,
"year_of_manufacture": 2013,
"edid_version": 1,
"edid_revision": 3
},
"video_input_parameters": {
"input_type": "analog",
"levels": 3,
"blank_to_black": false,
"seperate_sync": true,
"composite_sync": false,
"sync_on_green": false,
"vsync_serrated": false
}
}

1
frozen

@ -0,0 +1 @@
Subproject commit 87beaaf0f0c93b2199e10e6f4a955803a6a035ba

300
main.c
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#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include "frozen/frozen.h"
#define EDID_LENGTH 128
#define EDID_BYTES_OFFSET_HEADER_PREAMBLE 0
#define EDID_BYTES_OFFSET_HEADER_MANUFACTURER_ID 8
#define EDID_BYTES_OFFSET_HEADER_PRODUCT_CODE 10
typedef struct __attribute__ (( packed )) {
uint8_t resolution;
uint8_t image_aspect_ratio : 2;
uint8_t vertical_frequency : 6;
} standard_timing_information_t;
typedef struct __attribute__ (( packed )) {
/*! Header information, 20 bytes */
struct __attribute__ (( packed )) {
uint64_t preamble;
uint8_t manufacturer_id[2];
uint16_t product_code;
uint32_t serial_number;
uint8_t week_of_manufacture;
uint8_t year_of_manufacture;
uint8_t edid_version;
uint8_t edid_revision;
} header;
/*! Basic display parameters, 5 bytes */
struct __attribute__ (( packed )) {
union __attribute__ (( packed )) {
struct __attribute__ (( packed )) {
uint8_t video_interface : 4;
uint8_t bit_depth : 3;
uint8_t input_type : 1; // 1 for digital
} digital;
struct __attribute__ (( packed )) {
uint8_t vsync_serrated: 1;
uint8_t sync_on_green : 1;
uint8_t composite_sync: 1;
uint8_t seperate_sync : 1;
uint8_t blank_to_black: 1;
uint8_t levels : 2;
uint8_t input_type : 1; // 0 for analog
} analog;
} video_input_parameters; // 1 byte
uint8_t h_screen_size;
uint8_t v_screen_size;
uint8_t gamma;
struct __attribute__ (( packed )) {
uint8_t dpms_standby : 1;
uint8_t dpms_suspend : 1;
uint8_t dpms_active_off : 1;
uint8_t display_type : 2;
uint8_t standard_srgb : 1;
uint8_t preferred_timing_mode : 1;
uint8_t continuous_timings : 1;
} features;
} basic_display_parameters;
/*! Chromaticity coordinates. 10-bit CIE 1931 xy coordinates for red, green,
* blue, and white point, 10 bytes */
struct __attribute__ (( packed )) {
struct __attribute__ (( packed )) {
uint8_t red_x : 2;
uint8_t red_y : 2;
uint8_t green_x : 2;
uint8_t green_y : 2;
} red_green_lsbs;
struct __attribute__ (( packed )) {
uint8_t blue_x : 2;
uint8_t blue_y : 2;
uint8_t white_x : 2;
uint8_t white_y : 2;
} blue_white_lsbs;
uint8_t red_x_msbs;
uint8_t red_y_msbs;
uint8_t green_x_msbs;
uint8_t green_y_msbs;
uint8_t blue_x_msbs;
uint8_t blue_y_msbs;
uint8_t white_x_msbs;
uint8_t white_y_msbs;
} chromacity_cordinates;
/*! Established timing bitmap. Supported bitmap for (formerly) very common
timing modes. 3 bytes */
struct __attribute__ (( packed )) {
uint8_t m720_400_70 : 1;
uint8_t m720_400_80 : 1;
uint8_t m640_480_60 : 1;
uint8_t m640_480_67 : 1;
uint8_t m640_480_72 : 1;
uint8_t m640_480_75 : 1;
uint8_t m800_600_56 : 1;
uint8_t m800_600_60 : 1;
uint8_t m800_600_72 : 1;
uint8_t m800_600_75 : 1;
uint8_t m832_624_75 : 1;
uint8_t m1024_768_87 : 1;
uint8_t m1024_768_60 : 1;
uint8_t m1024_768_70 : 1;
uint8_t m1024_768_75 : 1;
uint8_t m1280_1024_75: 1;
uint8_t m1152_870_75 : 1;
uint8_t reserved : 7;
} common_timing_modes;
/*! Standard timing information. Up to 8 2-byte fields describing standard
display modes. Unused fields are filled with 01 01 hex. 16 bytes */
standard_timing_information_t timings[8];
uint8_t descriptor_1[18];
uint8_t descriptor_2[18];
uint8_t descriptor_3[18];
uint8_t descriptor_4[18];
uint8_t number_extensions;
uint8_t checksum;
} edid_t;
/**
* @brief test function to show buffer
*/
static void disp_buf(uint8_t *buf, int len)
{
int i;
for (i = 0; i < len; i++) {
printf("%02x ", buf[i]);
if ((i + 1) % 16 == 0) {
printf("\n");
}
}
printf("\n");
}
static size_t file_to_str(unsigned char** str, const char const* filename)
{
size_t length;
FILE * f = fopen (filename, "rb");
if (f) {
fseek (f, 0, SEEK_END);
length = ftell (f);
fseek (f, 0, SEEK_SET);
*str = (unsigned char*)malloc(length);
if (*str) {
fread (*str, 1, length, f);
}
fclose (f);
} else {
printf("File pointer is NULL..\n");
}
return length;
}
static void generate_preamble(edid_t* edid)
{
memset((uint8_t*)&(edid->header.preamble)+0, 0x00, 1);
memset((uint8_t*)&(edid->header.preamble)+1, 0xFF, 6);
memset((uint8_t*)&(edid->header.preamble)+7, 0x00, 1);
/*memset( edid + EDID_BYTES_OFFSET_HEADER_PREAMBLE,
0x00, 1);
memset( edid + EDID_BYTES_OFFSET_HEADER_PREAMBLE + 1,
0xFF, 6);
memset( edid + EDID_BYTES_OFFSET_HEADER_PREAMBLE + 7,
0x00, 1);
*/
}
static int generate_header(edid_t* edid, unsigned char* json_str, size_t json_len)
{
char* multi_use_str;
unsigned int multi_use_int;
if (edid && json_str) {
// Manufacturer ID
json_scanf( json_str, json_len, "{header: {manufacturer_id: %Q}",
&multi_use_str);
if (strlen(multi_use_str) == 3) {
multi_use_int = 0;
multi_use_int |=
((0x1F & (multi_use_str[0]-64)) << 10)| // First letter
((0x1F & (multi_use_str[1]-64)) << 5) | // Second letter
((0x1F & (multi_use_str[2]-64)) << 0); // Third letter
edid->header.manufacturer_id[0] = multi_use_int >> 8;
edid->header.manufacturer_id[1] = multi_use_int;
} else {
printf("Error: JSON file format is wrong somewhere arround manufacturer\
ID.\n");
return 1;
}
// Product code
json_scanf(json_str, json_len, "{header: {product_code: %d}", &multi_use_int);
edid->header.product_code = 0xFFFF & multi_use_int;
// Serial number
json_scanf(json_str, json_len, "{header: {serial_number: %d}", &multi_use_int);
edid->header.serial_number = 0xFFFFFFFF & multi_use_int;
// Week of manufacture
json_scanf( json_str, json_len, "{header: {week_of_manufacture: %d}",
&multi_use_int);
edid->header.week_of_manufacture = 0xFF & multi_use_int;
// Year of manufacture
json_scanf( json_str, json_len, "{header: {year_of_manufacture: %d}",
&multi_use_int);
edid->header.year_of_manufacture = 0xFF & (multi_use_int - 1990);
// EDID version
json_scanf(json_str, json_len, "{header: {edid_version: %d}", &multi_use_int);
edid->header.edid_version = 0xFF & multi_use_int;
// EDID revision
json_scanf(json_str, json_len, "{header: {edid_revision: %d}", &multi_use_int);
edid->header.edid_revision = 0xFF & multi_use_int;
} else {
printf("One of either edid or json_str is NULL.\n");
return 2;
}
return 0;
}
static int generate_video_input_parameters( edid_t* edid,
unsigned char* json_str,
size_t json_len)
{
char* multi_use_str;
unsigned int multi_use_int;
bool multi_use_bool;
if (edid && json_str) {
// Input type analog or digital
json_scanf( json_str, json_len, "{video_input_parameters: {input_type: %Q}",
&multi_use_str);
if (strcmp(multi_use_str, "analog") == 0) {
edid->basic_display_parameters.video_input_parameters
.analog.input_type = 0;
// Levels
json_scanf( json_str, json_len, "{video_input_parameters: {levels: %d}",
&multi_use_int);
edid->basic_display_parameters.video_input_parameters
.analog.levels = 0x3 & multi_use_int;
// Blank to black
json_scanf( json_str, json_len,
"{video_input_parameters: {blank_to_black: %B}",
&multi_use_bool);
edid->basic_display_parameters.video_input_parameters
.analog.blank_to_black = 0x1 & multi_use_bool;
// Seperate sync
json_scanf( json_str, json_len,
"{video_input_parameters: {seperate_sync: %B}",
&multi_use_bool);
edid->basic_display_parameters.video_input_parameters
.analog.seperate_sync = 0x1 & multi_use_bool;
// Composite sync
json_scanf( json_str, json_len,
"{video_input_parameters: {composite_sync: %B}",
&multi_use_bool);
edid->basic_display_parameters.video_input_parameters
.analog.composite_sync = 0x1 & multi_use_bool;
// Sync on green
json_scanf( json_str, json_len,
"{video_input_parameters: {sync_on_green: %B}",
&multi_use_bool);
edid->basic_display_parameters.video_input_parameters
.analog.sync_on_green = 0x1 & multi_use_bool;
// Vsync serrated
json_scanf( json_str, json_len,
"{video_input_parameters: {blank_to_black: %B}",
&multi_use_bool);
edid->basic_display_parameters.video_input_parameters
.analog.blank_to_black = 0x1 & multi_use_bool;
} else if (strcmp(multi_use_str, "digital") == 0) {
printf("Digital video configuration is not yet supported.\n");
return 1;
} else {
printf("Error: JSON file format is wrong somewhere around\
the video input params.\n");
return 2;
}
} else {
printf("One of either edid or json_str is NULL.\n");
return 3;
}
return 0;
}
int main(void)
{
//uint8_t edith[EDID_LENGTH];
edid_t edith;
memset(&edith, 0x00, sizeof(edith));
printf("size> %d bytes\n", sizeof(edith));
generate_preamble(&edith);
unsigned char* mystr = NULL;
size_t len = file_to_str(&mystr, "edid.json");
if (mystr) {
printf("%s\n", mystr);
printf("len> %d\n", len);
//free(mystr);
}
generate_header(&edith, mystr, len);
generate_video_input_parameters(&edith, mystr, len);
disp_buf((uint8_t*)&edith, EDID_LENGTH);
return 0;
}
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