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https://github.com/exA-Arcadia/exa-io.git
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47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
#include "edid.h"
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#include "pico/stdlib.h"
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#include "i2c_slave.h"
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#include "i2c_fifo.h"
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#define PIN_SDA 4
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#define PIN_SCL 5
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static const uint8_t edid_value[128] =
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"\x00\xff\xff\xff\xff\xff\xff\x00\x31\xd8\x00\x00\x00\x00\x00\x00"
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"\x05\x21\x01\x03\x6d\x10\x0c\x78\xea\x5e\xc0\xa4\x59\x4a\x98\x25"
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"\x20\x50\x54\x00\x00\x00\x31\x40\x01\x01\x01\x01\x01\x01\x01\x01"
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"\x01\x01\x01\x01\x01\x01\x8c\x0a\x80\xda\x20\xe0\x2d\x10\x18\x60"
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"\xa4\x00\xa6\x7d\x00\x00\x00\x18\x00\x00\x00\xff\x00\x74\x64\x2d"
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"\x69\x6f\x20\x20\x20\x0a\x20\x20\x20\x20\x00\x00\x00\xfd\x00\x3b"
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"\x3d\x1e\x20\x03\x00\x0a\x20\x20\x20\x20\x20\x20\x00\x00\x00\xfc"
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"\x00\x74\x64\x2d\x69\x6f\x0a\x20\x20\x20\x20\x20\x20\x20\x00\xf6";
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static int16_t edid_address = 0;
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static void edid_handler(i2c_inst_t *i2c, i2c_slave_event_t event) {
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switch (event) {
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case I2C_SLAVE_RECEIVE:
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edid_address = i2c_read_byte(i2c) & 0x7F;
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break;
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case I2C_SLAVE_REQUEST:
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i2c_write_byte(i2c, edid_value[edid_address]);
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edid_address++;
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if (edid_address > 127) edid_address = 0;
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break;
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default:
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break;
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}
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}
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void edid_init(void) {
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gpio_init(PIN_SDA);
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gpio_init(PIN_SCL);
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gpio_pull_up(PIN_SDA);
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gpio_pull_up(PIN_SCL);
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gpio_set_function(PIN_SDA, GPIO_FUNC_I2C);
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gpio_set_function(PIN_SCL, GPIO_FUNC_I2C);
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i2c_init(i2c0, 100000);
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i2c_slave_init(i2c0, 0x50, &edid_handler);
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}
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