Add blink_btn.
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@ -6,6 +6,10 @@ They aren't too specific for the bat boards, except the usual pinout considerati
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## Short summary for the examples
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### blink_btn
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The onboard LED blinks, holding the button slows the frequency somewhat. The clocks are set up to 48MHz on F072, 32MHz on L052 (max).
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### usb_cdcacm
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The board presents itself as a serial port (CDC). It echoes back what it receives; toggling the LED after each received packet. Pressing the `PA1` button will print `hello, world` over this port.
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26
blink_btn/Makefile.f0
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26
blink_btn/Makefile.f0
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@ -0,0 +1,26 @@
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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 <uwe@hermann-uwe.de>
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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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BINARY = button
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OPENCM3_DIR=../libopencm3
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LDSCRIPT = $(OPENCM3_DIR)/lib/stm32/f0/stm32f07xzb.ld
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include ../common.f0.mk
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26
blink_btn/Makefile.l0
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26
blink_btn/Makefile.l0
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@ -0,0 +1,26 @@
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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 <uwe@hermann-uwe.de>
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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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BINARY = button
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OPENCM3_DIR=../libopencm3
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LDSCRIPT = $(OPENCM3_DIR)/lib/stm32/l0/stm32l0xx8.ld
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include ../common.l0.mk
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27
blink_btn/Makefile.l0btld
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27
blink_btn/Makefile.l0btld
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@ -0,0 +1,27 @@
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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 <uwe@hermann-uwe.de>
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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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BINARY = button
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OPENCM3_DIR=../libopencm3
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LDSCRIPT = ../l052-bldr.ld
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DEFS += -DBOOTLOADER8K
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include ../common.l0.mk
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126
blink_btn/button.c
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126
blink_btn/button.c
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@ -0,0 +1,126 @@
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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 <uwe@hermann-uwe.de>,
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* Copyright (C) 2010 Piotr Esden-Tempski <piotr@esden.net>
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* Copyright (C) 2011 Stephen Caudle <scaudle@doceme.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/flash.h>
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#include <libopencm3/stm32/gpio.h>
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#define LED_GPIO GPIOA
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#define LED_PIN GPIO15
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#define LED_RCC_GPIO RCC_GPIOA
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#define BUTTON_GPIO GPIOA
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#define BUTTON_PIN GPIO1
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#define BUTTON_RCC_GPIO RCC_GPIOA
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/* Set the clock to max speed. */
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static void clock_setup(void)
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{
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#if defined(STM32F0)
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rcc_clock_setup_in_hsi_out_48mhz();
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#elif defined(STM32L0)
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/* After a reset, the system uses MSI@2.1MHz. */
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/* end result: 32MHz PLLVCO from HSI16,
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* no system/periph clock divide.
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*/
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/* increase the latency to 1 wait state (we'll be speeding up) */
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flash_set_ws(1);
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/* turn on HSI16 */
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rcc_osc_on(RCC_HSI16);
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rcc_wait_for_osc_ready(RCC_HSI16);
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/* run AHB, APB1, APB2 at full speed */
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rcc_set_hpre(RCC_CFGR_HPRE_NODIV);
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rcc_set_ppre1(RCC_CFGR_PPRE1_NODIV);
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rcc_set_ppre2(RCC_CFGR_PPRE2_NODIV);
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/* turn off PLL and wait for it to fully stop */
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rcc_osc_off(RCC_PLL);
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while (RCC_CR & RCC_CR_PLLRDY);
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/* set PLL source to HSI16 */
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RCC_CFGR &= ~(1<<16); // RCC_CFGR_PLLSRC
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/* set up PLL */
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rcc_set_pll_multiplier(RCC_CFGR_PLLMUL_MUL4);
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rcc_set_pll_divider(RCC_CFGR_PLLDIV_DIV2);
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/* turn on and switch to PLL */
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rcc_osc_on(RCC_PLL);
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rcc_wait_for_osc_ready(RCC_PLL);
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rcc_set_sysclk_source(RCC_PLL);
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rcc_ahb_frequency = 32000000;
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rcc_apb1_frequency = 32000000;
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rcc_apb2_frequency = 32000000;
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#else
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#error "Implement a clock setup."
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#endif
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}
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static void gpio_setup(void)
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{
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/* Enable clocks. */
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rcc_periph_clock_enable(LED_RCC_GPIO);
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rcc_periph_clock_enable(BUTTON_RCC_GPIO);
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/* Set the LED pin to 'output push-pull'. */
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gpio_mode_setup(LED_GPIO, GPIO_MODE_OUTPUT,
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GPIO_PUPD_NONE, LED_PIN);
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/* Set the button pin to 'input' (external pull-down). */
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gpio_mode_setup(BUTTON_GPIO, GPIO_MODE_INPUT, GPIO_PUPD_NONE, BUTTON_PIN);
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}
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#define SCB_VTOR MMIO32(0xE000ED08)
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int main(void)
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{
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#if defined(BOOTLOADER8K)
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SCB_VTOR = (uint32_t) 0x08002000;
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#endif
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int i;
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clock_setup();
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gpio_setup();
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/* Blink the LED on the board. */
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while (1) {
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gpio_toggle(LED_GPIO, LED_PIN);
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/* Upon button press, blink more slowly. */
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if (gpio_get(BUTTON_GPIO, BUTTON_PIN)) {
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for (i = 0; i < 2000000; i++) { /* Wait a bit. */
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__asm__("nop");
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}
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}
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for (i = 0; i < 2000000; i++) { /* Wait a bit. */
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__asm__("nop");
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}
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}
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return 0;
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}
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// vim: tabstop=4:shiftwidth=4:noexpandtab
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