mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-10-01 13:40:32 +02:00
Kevin Thomas
35eacd2c0e
- 0x0011a_cb (Operation Dark Vector): nation-state CTF redesign with an AES-128-ECB sealed target and a plaintext launch origin; RP2350 firmware with bearing-driven servo, tri-color LEDs, GSV stats, and a realistic no-fix path - docs: story-driven classified brief, GDB and Ghidra tutorials with deep step-throughs, regenerated artifacts and PDFs - scripts: docstring standard, AES per-student randomizer, telemetry monitor - week 3 to week 5 lessons: Ghidra patching tutorial, CMSIS-SVD hardware RE, double floating-point and GPIO architecture chapters, README structure
145 lines
4.0 KiB
C
145 lines
4.0 KiB
C
// MIT License
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//
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// Copyright (c) 2026 Kevin Thomas
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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 all
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// 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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// Author: Kevin Thomas
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// Email: kevin@mytechnotalent.com
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// GitHub: https://github.com/mytechnotalent
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// File: lcd.c
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// Desc: Implements I2C HD44780 16x2 LCD display for live telemetry coordinates.
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// Created: 2026
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#include "lcd.h"
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#include "pico/stdlib.h"
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#define PIN_RS 0x01
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#define PIN_EN 0x04
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#define BACKLIGHT 0x08
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static uint8_t lcd_addr = 0x27;
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static bool lcd_ready = false;
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static void pcf_write(uint8_t d)
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{
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if (lcd_ready)
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i2c_write_blocking(LCD_I2C_INST, lcd_addr, &d, 1, false);
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}
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static void pcf_pulse(uint8_t d)
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{
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pcf_write(d | PIN_EN);
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sleep_us(1);
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pcf_write(d & ~PIN_EN);
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sleep_us(50);
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}
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static void lcd_write4(uint8_t n, uint8_t mode)
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{
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uint8_t d = (n & 0x0F) << 4;
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d |= mode ? PIN_RS : 0;
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d |= BACKLIGHT;
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pcf_pulse(d);
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}
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static void lcd_send(uint8_t v, uint8_t mode)
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{
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lcd_write4((v >> 4) & 0x0F, mode);
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lcd_write4(v & 0x0F, mode);
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}
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static void lcd_clear(void)
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{
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lcd_send(0x01, 0);
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sleep_ms(2);
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}
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static void lcd_set_cursor(int row, int col)
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{
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uint8_t offset = (row == 0) ? 0x00 : 0x40;
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lcd_send(0x80 | (col + offset), 0);
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}
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static void lcd_puts(const char *s)
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{
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while (*s)
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lcd_send((uint8_t)*s++, 1);
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}
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static void lcd_reset_seq(void)
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{
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lcd_write4(0x03, 0); sleep_ms(5);
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lcd_write4(0x03, 0); sleep_us(150);
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lcd_write4(0x03, 0); sleep_us(150);
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lcd_write4(0x02, 0); sleep_us(150);
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}
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static void lcd_cfg_seq(void)
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{
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lcd_send(0x28, 0);
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lcd_send(0x0C, 0);
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lcd_clear();
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lcd_send(0x06, 0);
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}
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static bool detect_lcd(void)
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{
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uint8_t rx;
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if (i2c_read_blocking(LCD_I2C_INST, 0x27, &rx, 1, false) >= 0)
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return (lcd_addr = 0x27, true);
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if (i2c_read_blocking(LCD_I2C_INST, 0x3F, &rx, 1, false) >= 0)
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return (lcd_addr = 0x3F, true);
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return false;
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}
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void init_lcd(void)
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{
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i2c_init(LCD_I2C_INST, LCD_BAUD);
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gpio_set_function(LCD_SDA_PIN, GPIO_FUNC_I2C);
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gpio_set_function(LCD_SCL_PIN, GPIO_FUNC_I2C);
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gpio_pull_up(LCD_SDA_PIN); gpio_pull_up(LCD_SCL_PIN);
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if (!(lcd_ready = detect_lcd())) return;
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lcd_reset_seq();
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lcd_cfg_seq();
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}
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void lcd_show_coords(double lat, double lon)
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{
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if (!lcd_ready && !(lcd_ready = detect_lcd())) return;
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char r1[17], r2[17];
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snprintf(r1, sizeof(r1), "LAT: %9.6f %c", fabs(lat), (lat >= 0.0) ? 'N' : 'S');
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snprintf(r2, sizeof(r2), "LON: %9.6f %c", fabs(lon), (lon >= 0.0) ? 'E' : 'W');
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lcd_set_cursor(0, 0); lcd_puts(r1);
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lcd_set_cursor(1, 0); lcd_puts(r2);
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}
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void lcd_show_gnss(int sats, int cno)
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{
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if (!lcd_ready && !(lcd_ready = detect_lcd())) return;
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char r1[17], r2[17];
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snprintf(r1, sizeof(r1), "SAT:%2d CNO:%2d ", sats, cno);
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snprintf(r2, sizeof(r2), "%-16s", (sats > 0) ? "ACQUIRING..." : "NO SIGNAL");
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lcd_set_cursor(0, 0); lcd_puts(r1);
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lcd_set_cursor(1, 0); lcd_puts(r2);
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}
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