976720c355
Be specifically careful with the usb examples. There is likely some breakage to be expected, not sure I updated all the drivers to the correct types for the respective chips.
126 lines
3.3 KiB
C
126 lines
3.3 KiB
C
/*
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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 <uwe@hermann-uwe.de>
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* Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
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* Copyright (C) 2012 Daniel Serpell <daniel.serpell@gmail.com>
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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 <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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static void clock_setup(void)
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{
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/* Enable high-speed clock at 120MHz */
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rcc_clock_setup_hse_3v3(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_120MHZ]);
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/* Enable GPIOD clock for LED & USARTs. */
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rcc_periph_clock_enable(RCC_GPIOD);
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rcc_periph_clock_enable(RCC_GPIOA);
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/* Enable clocks for USART2. */
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rcc_periph_clock_enable(RCC_USART2);
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}
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static void usart_setup(void)
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{
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/* Setup USART2 parameters. */
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usart_set_baudrate(USART2, 38400);
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usart_set_databits(USART2, 8);
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usart_set_stopbits(USART2, USART_STOPBITS_1);
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usart_set_mode(USART2, USART_MODE_TX);
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usart_set_parity(USART2, USART_PARITY_NONE);
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usart_set_flow_control(USART2, USART_FLOWCONTROL_NONE);
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/* Finally enable the USART. */
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usart_enable(USART2);
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}
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static void gpio_setup(void)
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{
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/* Setup GPIO pin GPIO12 on GPIO port D for LED. */
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gpio_mode_setup(GPIOD, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO12);
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/* Setup GPIO pins for USART2 transmit. */
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gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO2);
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/* Setup USART2 TX pin as alternate function. */
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gpio_set_af(GPIOA, GPIO_AF7, GPIO2);
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}
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/* Maximum number of iterations for the escape-time calculation */
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#define maxIter 32
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/* This array converts the iteration count to a character representation. */
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static char color[maxIter+1] = " .:++xxXXX%%%%%%################";
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/* Main mandelbrot calculation */
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static int iterate(float px, float py)
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{
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int it = 0;
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float x = 0, y = 0;
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while (it < maxIter) {
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float nx = x*x;
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float ny = y*y;
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if ((nx + ny) > 4) {
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return it;
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}
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/* Zn+1 = Zn^2 + P */
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y = 2*x*y + py;
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x = nx - ny + px;
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it++;
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}
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return 0;
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}
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static void mandel(float cX, float cY, float scale)
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{
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int x, y;
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for (x = -60; x < 60; x++) {
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for (y = -50; y < 50; y++) {
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int i = iterate(cX + x*scale, cY + y*scale);
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usart_send_blocking(USART2, color[i]);
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}
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usart_send_blocking(USART2, '\r');
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usart_send_blocking(USART2, '\n');
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}
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}
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int main(void)
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{
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float scale = 0.25f, centerX = -0.5f, centerY = 0.0f;
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clock_setup();
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gpio_setup();
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usart_setup();
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while (1) {
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/* Blink the LED (PD12) on the board with each fractal drawn. */
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gpio_toggle(GPIOD, GPIO12); /* LED on/off */
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mandel(centerX, centerY, scale); /* draw mandelbrot */
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/* Change scale and center */
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centerX += 0.175f * scale;
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centerY += 0.522f * scale;
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scale *= 0.875f;
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usart_send_blocking(USART2, '\r');
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usart_send_blocking(USART2, '\n');
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}
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return 0;
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}
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