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LCD version of the Mandelbrot example
This version is the ASCII one but uses the LCD display that is attached to the board for a more colorful result. This example also zooms into a more "interesting" place in the set so the display stays interesting during the full 100 generations.
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‎examples/stm32/f4/stm32f429i-discovery/mandelbrot-lcd/Makefile

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##
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## This file is part of the libopencm3 project.
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##
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## Copyright (C) 2009 Uwe Hermann <[email protected]>
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##
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## This library is free software: you can redistribute it and/or modify
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## it under the terms of the GNU Lesser 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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##
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## This library 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 Lesser General Public License for more details.
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##
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## You should have received a copy of the GNU Lesser General Public License
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## along with this library. If not, see <http://www.gnu.org/licenses/>.
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##
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OBJS = sdram.o lcd.o clock.o
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BINARY = mandel
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LDSCRIPT = ../stm32f429i-discovery.ld
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include ../../Makefile.include
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‎examples/stm32/f4/stm32f429i-discovery/mandelbrot-lcd/README.md

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# README
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This example program demonstrates the floating point coprocessor usage on
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the ST STM32F429IDISCOVERY eval board.
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The mandlebrot is calculated and displayed on the attached LCD
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## Board connections
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| Port | Function | Description |
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| ----- | ------------- | --------------------------------- |
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| `PA9` | `(USART1_TX)` | TTL serial output `(115200,8,N,1)` |
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Data can be sent to the serial port for debugging.

‎examples/stm32/f4/stm32f429i-discovery/mandelbrot-lcd/clock.c

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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2009 Uwe Hermann <[email protected]>
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* Copyright (C) 2011 Stephen Caudle <[email protected]>
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* Copyright (C) 2012 Daniel Serpell <[email protected]>
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* Copyright (C) 2015 Piotr Esden-Tempski <[email protected]>
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* Copyright (C) 2015 Chuck McManis <[email protected]>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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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*
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* This library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <ctype.h>
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/usart.h>
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#include <libopencm3/cm3/systick.h>
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#include <libopencm3/cm3/nvic.h>
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#include "clock.h"
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void clock_setup(void)
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{
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rcc_clock_setup_hse_3v3(&hse_8mhz_3v3[CLOCK_3V3_168MHZ]);
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/* set up the SysTick function (1mS interrupts) */
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systick_set_clocksource(STK_CSR_CLKSOURCE_AHB);
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STK_CVR = 0;
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systick_set_reload(rcc_ahb_frequency / 1000);
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systick_counter_enable();
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systick_interrupt_enable();
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}
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/* simple millisecond counter */
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static volatile uint32_t system_millis;
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static volatile uint32_t delay_timer;
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/*
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* Simple systick handler
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*
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* Increments a 32 bit value once per millesecond
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* which rolls over every 49 days.
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*/
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void sys_tick_handler(void)
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{
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system_millis++;
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if (delay_timer > 0) {
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delay_timer--;
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}
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}
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/*
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* Simple spin loop waiting for time to pass
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*
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* A couple of things to note:
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* First, you can't just compare to
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* system_millis because doing so will mean
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* you delay forever if you happen to hit a
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* time where it is rolling over.
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* Second, accuracy is "at best" 1mS as you
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* may call this "just before" the systick hits
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* with a value of '1' and it would return
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* nearly immediately. So if you need really
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* precise delays, use one of the timers.
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*/
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void
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msleep(uint32_t delay)
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{
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delay_timer = delay;
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while (delay_timer);
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}
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uint32_t
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mtime(void)
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{
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return system_millis;
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}

‎examples/stm32/f4/stm32f429i-discovery/mandelbrot-lcd/clock.h

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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2014-2015 Chuck McManis <[email protected]>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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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*
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* This library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* clock functions
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*/
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extern void clock_setup(void);
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extern void msleep(uint32_t);
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extern uint32_t mtime(void);
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