From d17e548c6f45987fbb78603574b2b882cd97a53b Mon Sep 17 00:00:00 2001 From: Stephen Caudle Date: Mon, 31 Oct 2011 15:01:25 -0400 Subject: Add STM32F4 button example --- examples/stm32/f4/stm32-discovery/button/Makefile | 23 +++++++ examples/stm32/f4/stm32-discovery/button/README | 8 +++ examples/stm32/f4/stm32-discovery/button/button.c | 79 ++++++++++++++++++++++ examples/stm32/f4/stm32-discovery/button/button.ld | 32 +++++++++ 4 files changed, 142 insertions(+) create mode 100644 examples/stm32/f4/stm32-discovery/button/Makefile create mode 100644 examples/stm32/f4/stm32-discovery/button/README create mode 100644 examples/stm32/f4/stm32-discovery/button/button.c create mode 100644 examples/stm32/f4/stm32-discovery/button/button.ld diff --git a/examples/stm32/f4/stm32-discovery/button/Makefile b/examples/stm32/f4/stm32-discovery/button/Makefile new file mode 100644 index 0000000..96731c2 --- /dev/null +++ b/examples/stm32/f4/stm32-discovery/button/Makefile @@ -0,0 +1,23 @@ +## +## This file is part of the libopencm3 project. +## +## Copyright (C) 2009 Uwe Hermann +## +## This program is free software: you can redistribute it and/or modify +## it under the terms of the GNU General Public License as published by +## the Free Software Foundation, either version 3 of the License, or +## (at your option) any later version. +## +## This program 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 General Public License for more details. +## +## You should have received a copy of the GNU General Public License +## along with this program. If not, see . +## + +BINARY = button + +include ../../Makefile.include + diff --git a/examples/stm32/f4/stm32-discovery/button/README b/examples/stm32/f4/stm32-discovery/button/README new file mode 100644 index 0000000..b794dda --- /dev/null +++ b/examples/stm32/f4/stm32-discovery/button/README @@ -0,0 +1,8 @@ +------------------------------------------------------------------------------ +README +------------------------------------------------------------------------------ + +This example blinks the green LED on the ST STM32F4DISCOVERY eval board. + +When you press the 'USER' button, the blinking is slower. + diff --git a/examples/stm32/f4/stm32-discovery/button/button.c b/examples/stm32/f4/stm32-discovery/button/button.c new file mode 100644 index 0000000..e872887 --- /dev/null +++ b/examples/stm32/f4/stm32-discovery/button/button.c @@ -0,0 +1,79 @@ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2009 Uwe Hermann , + * Copyright (C) 2010 Piotr Esden-Tempski + * Copyright (C) 2011 Stephen Caudle + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include +#include + +u16 exti_line_state; + +/* Set STM32 to 168 MHz. */ +void clock_setup(void) +{ + rcc_clock_setup_hse_3v3(&hse_8mhz_3v3[CLOCK_3V3_168MHZ]); +} + +void gpio_setup(void) +{ + /* Enable GPIOD clock. */ + rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPDEN); + + /* Set GPIO12 (in GPIO port D) to 'output push-pull'. */ + gpio_mode_setup(GPIOD, GPIO_MODE_OUTPUT, + GPIO_PUPD_NONE, + GPIO12 | GPIO13 | GPIO14 | GPIO15); +} + +void button_setup(void) +{ + /* Enable GPIOA clock. */ + rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPAEN); + + /* Set GPIO0 (in GPIO port A) to 'input open-drain'. */ + gpio_mode_setup(GPIOA, GPIO_MODE_INPUT, + GPIO_PUPD_NONE, + GPIO0); +} + +int main(void) +{ + int i; + + clock_setup(); + button_setup(); + gpio_setup(); + + /* Blink the LED (PD12) on the board. */ + while (1) { + gpio_toggle(GPIOD, GPIO12); + + /* Upon button press, blink more slowly. */ + exti_line_state = GPIOA_IDR; + if ((exti_line_state & (1 << 0)) != 0) { + for (i = 0; i < 3000000; i++) /* Wait a bit. */ + __asm__("nop"); + } + + for (i = 0; i < 3000000; i++) /* Wait a bit. */ + __asm__("nop"); + } + + return 0; +} diff --git a/examples/stm32/f4/stm32-discovery/button/button.ld b/examples/stm32/f4/stm32-discovery/button/button.ld new file mode 100644 index 0000000..1cb43c6 --- /dev/null +++ b/examples/stm32/f4/stm32-discovery/button/button.ld @@ -0,0 +1,32 @@ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2009 Uwe Hermann + * Copyright (C) 2011 Stephen Caudle + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +/* Linker script for ST STM32F4DISCOVERY (STM32F407VG, 1024K flash, 128K RAM). */ + +/* Define memory regions. */ +MEMORY +{ + rom (rx) : ORIGIN = 0x08000000, LENGTH = 1024K + ram (rwx) : ORIGIN = 0x20000000, LENGTH = 128K +} + +/* Include the common ld script. */ +INCLUDE libopencm3_stm32f4.ld + -- cgit v1.2.3