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117 lines
3.6 KiB
C
117 lines
3.6 KiB
C
//
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// Copyright 2022 Wenting Zhang <zephray@outlook.com>
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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#include <stdint.h>
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#include "pico/stdlib.h"
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#include "hardware/i2c.h"
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#include "ptn3460.h"
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#include "utils.h"
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#include "edid.h"
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#define PTN3460_I2C_ADDRESS (0x60)
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#define PTN3460_I2C (i2c0)
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#define PTN3460_HPD_PIN (8)
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#define PTN3460_PDN_PIN (9)
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#define PTN3460_VALID_PIN (2)
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void ptn3460_select_edid_emulation(uint8_t id) {
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uint8_t buf[2];
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int result;
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buf[0] = (uint8_t)0x84;
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buf[1] = (uint8_t)0x01 | (id << 1);
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result = i2c_write_blocking(PTN3460_I2C, PTN3460_I2C_ADDRESS,
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buf, 2, false);
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if (result != 2) {
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fatal("Failed writing data to PTN3460\n");
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}
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}
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void ptn3460_load_edid(uint8_t *edid) {
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int result;
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// Fix checksum in EDID
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uint8_t checksum = 0;
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for (int i = 1; i < 128; i++) {
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checksum += edid[i];
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}
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checksum = ~checksum + 1;
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edid[128] = checksum;
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result = i2c_write_blocking(PTN3460_I2C, PTN3460_I2C_ADDRESS,
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edid, 129, false);
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if (result != 129) {
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fatal("Failed writing data to PTN3460\n");
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}
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}
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void ptn3460_write(uint8_t reg, uint8_t val) {
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uint8_t buf[2];
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int result;
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buf[0] = reg;
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buf[1] = val;
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result = i2c_write_blocking(PTN3460_I2C, PTN3460_I2C_ADDRESS,
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buf, 2, false);
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if (result != 2) {
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fatal("Failed writing data to PTN3460\n");
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}
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}
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void ptn3460_init(void) {
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gpio_init(PTN3460_HPD_PIN);
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gpio_set_dir(PTN3460_HPD_PIN, GPIO_IN);
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gpio_pull_down(PTN3460_HPD_PIN);
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gpio_init(PTN3460_PDN_PIN);
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gpio_put(PTN3460_PDN_PIN, 1);
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gpio_set_dir(PTN3460_PDN_PIN, GPIO_OUT);
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gpio_init(PTN3460_VALID_PIN);
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gpio_set_dir(PTN3460_VALID_PIN, GPIO_IN);
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gpio_pull_down(PTN3460_VALID_PIN);
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sleep_ms(100);
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// wait for HPD to become high
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int ticks = 0;
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while (gpio_get(PTN3460_HPD_PIN) != true) {
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ticks ++;
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if (ticks > 500) {
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fatal("PTN3460 boot timeout\n");
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}
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sleep_ms(1);
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}
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printf("PTN3460 up after %d ms\n", ticks);
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// Enable EDID emulation
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ptn3460_select_edid_emulation(0);
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ptn3460_load_edid(edid);
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//ptn3460_write(0x80, 0x02); // Set AUX reverse
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ptn3460_write(0x81, 0x29); // 18bpp, clock on odd bus, dual channel
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/*uint8_t buf[2];
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int result;
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buf[0] = (uint8_t)0x80;
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buf[1] = (uint8_t)0x02;
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result = i2c_write_blocking(PTN3460_I2C, PTN3460_I2C_ADDRESS,
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buf, 2, false);
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if (result != 2) {
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fatal("Failed writing data to PTN3460\n");
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}*/
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}
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bool ptn3460_is_valid(void) {
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return gpio_get(PTN3460_VALID_PIN);
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}
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