103 lines
3.7 KiB
C++
103 lines
3.7 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-20 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** @file DisplayID class definitions.
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DisplayID is a special purpose class for handling display
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identification (aka Monitor Plug-n-Play) as required by
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video cards.
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DisplayID provides two methods for display identification:
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- Apple monitor sense codes as described in the Technical Note HW30
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- Display Data Channel (DDC) standardized by VESA
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*/
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#ifndef DISPLAY_ID_H
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#define DISPLAY_ID_H
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#include <cinttypes>
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/** I2C bus states. */
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enum I2CState : uint8_t {
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STOP = 0, /* transaction started */
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START = 1, /* transaction ended (idle) */
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DEV_ADDR = 2, /* receiving device address */
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REG_ADDR = 3, /* receiving register address */
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DATA = 4, /* sending/receiving data */
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ACK = 5, /* sending/receiving acknowledge */
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NACK = 6 /* no acknowledge (error) */
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};
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class DisplayID {
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public:
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DisplayID();
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~DisplayID() = default;
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uint16_t read_monitor_sense(uint16_t data, uint16_t dirs);
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protected:
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uint16_t set_result(uint8_t sda, uint8_t scl);
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uint16_t update_ddc_i2c(uint8_t sda, uint8_t scl);
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private:
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bool i2c_on;
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uint8_t std_sense_code;
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uint8_t ext_sense_code;
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/* DDC I2C variables. */
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uint8_t next_state;
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uint8_t prev_state;
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uint8_t last_sda;
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uint8_t last_scl;
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uint16_t data_out;
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int bit_count; /* number of bits processed so far */
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uint8_t byte; /* byte value being currently transferred */
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uint8_t dev_addr; /* current device address */
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uint8_t reg_addr; /* current register address */
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uint8_t* data_ptr; /* ptr to data byte to be transferred next */
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uint8_t edid[128] = {
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0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x06, 0x10, 0x02, 0x9d, 0x01, 0x01, 0x01,
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0x01, 0x08, 0x09, 0x01, 0x01, 0x68, 0x20, 0x18, 0x28, 0xe8, 0x04, 0x89, 0xa0, 0x57, 0x4a,
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0x9b, 0x26, 0x12, 0x48, 0x4c, 0x31, 0x2b, 0x80, 0x31, 0x59, 0x45, 0x59, 0x61, 0x59, 0xa9,
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0x40, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x60, 0x16, 0x40, 0x40, 0x31, 0x70,
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0x2b, 0x20, 0x20, 0x40, 0x23, 0x00, 0x38, 0xea, 0x10, 0x00, 0x00, 0x18, 0x48, 0x3f, 0x40,
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0x32, 0x62, 0xb0, 0x32, 0x40, 0x40, 0xc2, 0x13, 0x00, 0x38, 0xea, 0x10, 0x00, 0x00, 0x18,
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0x00, 0x00, 0x00, 0xfd, 0x00, 0x30, 0xa0, 0x1e, 0x55, 0x10, 0x00, 0x0a, 0x20, 0x20, 0x20,
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0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x74, 0x75, 0x64, 0x69, 0x6f, 0x44,
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0x73, 0x70, 0x6c, 0x79, 0x31, 0x37, 0x00, 0x19};
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/* More EDID:
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00ff ffff ffff ff00 5a63 5151 0341 0000
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240a 0102 1f28 1eb3 e850 69a7 5148 9b24
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0e48 4cff ff80 3159 4559 6159 714f 8140
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8199 a940 a94f 0000 00ff 0053 5a30 3336
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3136 3634 330a 2020 0000 00fd 0032 b41e
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61ff 000a 2020 2020 2020 0000 00fc 0056
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6965 7753 6f6e 6963 2047 3831 0000 00fc
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0030 2d34 4d0a 2020 2020 2020 2020 00f7
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*/
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};
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#endif /* DISPLAY_ID_H */
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