From 7006d3c45770fc46647968985bb3f959f50d1de3 Mon Sep 17 00:00:00 2001 From: Piotr Esden-Tempski Date: Sun, 11 Nov 2012 20:37:18 -0800 Subject: [examples] Added systick example for obldc strip. --- examples/stm32/f1/obldc-strip/systick/Makefile | 25 ++++++++ examples/stm32/f1/obldc-strip/systick/systick.c | 81 +++++++++++++++++++++++++ 2 files changed, 106 insertions(+) create mode 100644 examples/stm32/f1/obldc-strip/systick/Makefile create mode 100644 examples/stm32/f1/obldc-strip/systick/systick.c (limited to 'examples') diff --git a/examples/stm32/f1/obldc-strip/systick/Makefile b/examples/stm32/f1/obldc-strip/systick/Makefile new file mode 100644 index 0000000..d89dd3e --- /dev/null +++ b/examples/stm32/f1/obldc-strip/systick/Makefile @@ -0,0 +1,25 @@ +## +## This file is part of the libopencm3 project. +## +## Copyright (C) 2009 Uwe Hermann +## +## This library is free software: you can redistribute it and/or modify +## it under the terms of the GNU Lesser General Public License as published by +## the Free Software Foundation, either version 3 of the License, or +## (at your option) any later version. +## +## This library is distributed in the hope that it will be useful, +## but WITHOUT ANY WARRANTY; without even the implied warranty of +## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +## GNU Lesser General Public License for more details. +## +## You should have received a copy of the GNU Lesser General Public License +## along with this library. If not, see . +## + +BINARY = systick + +LDSCRIPT = ../obldc-strip.ld + +include ../../Makefile.include + diff --git a/examples/stm32/f1/obldc-strip/systick/systick.c b/examples/stm32/f1/obldc-strip/systick/systick.c new file mode 100644 index 0000000..8b94901 --- /dev/null +++ b/examples/stm32/f1/obldc-strip/systick/systick.c @@ -0,0 +1,81 @@ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2012 Piotr Esden-Tempski + * + * This library is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this library. If not, see . + */ + +#include +#include +#include +#include +#include + +u32 temp32; + +void gpio_setup(void) +{ + /* Enable alternate function peripheral clock. */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_AFIOEN); + + /* Enable GPIOB clock. */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN); + + gpio_clear(GPIOB, GPIO4); /* LED green on */ + gpio_set(GPIOB, GPIO5); /* LED red off */ + + /* Set GPIO4/5 (in GPIO port B) to 'output push-pull' for the LEDs. */ + gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ, + GPIO_CNF_OUTPUT_PUSHPULL, GPIO4); + gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ, + GPIO_CNF_OUTPUT_PUSHPULL, GPIO5); + + AFIO_MAPR |= AFIO_MAPR_SWJ_CFG_FULL_SWJ_NO_JNTRST; +} + +void sys_tick_handler(void) +{ + temp32++; + + /* We call this handler every 1ms so 1000ms = 1s on/off. */ + if (temp32 == 1000) { + gpio_toggle(GPIOB, GPIO4); /* LED green on/off */ + gpio_toggle(GPIOB, GPIO5); /* LED red on/off */ + temp32 = 0; + } +} + +int main(void) +{ + rcc_clock_setup_in_hsi_out_64mhz(); + gpio_setup(); + + temp32 = 0; + + /* 64MHz / 8 => 8000000 counts per second */ + systick_set_clocksource(STK_CTRL_CLKSOURCE_AHB_DIV8); + + /* 8000000/8000 = 1000 overflows per second - every 1ms one interrupt */ + systick_set_reload(8000); + + systick_interrupt_enable(); + + /* Start counting. */ + systick_counter_enable(); + + while (1); /* Halt. */ + + return 0; +} -- cgit v1.2.3