From 580d25a84baaa160b0afdc096e9aa1e8ca1c2d2b Mon Sep 17 00:00:00 2001 From: Stephen Caudle Date: Mon, 31 Oct 2011 00:16:37 -0400 Subject: Move STM32 example projects in family specific folders --- examples/stm32/f1/stm32-h103/timer/Makefile | 23 ++++ examples/stm32/f1/stm32-h103/timer/timer.c | 183 ++++++++++++++++++++++++++++ examples/stm32/f1/stm32-h103/timer/timer.ld | 31 +++++ 3 files changed, 237 insertions(+) create mode 100644 examples/stm32/f1/stm32-h103/timer/Makefile create mode 100644 examples/stm32/f1/stm32-h103/timer/timer.c create mode 100644 examples/stm32/f1/stm32-h103/timer/timer.ld (limited to 'examples/stm32/f1/stm32-h103/timer') diff --git a/examples/stm32/f1/stm32-h103/timer/Makefile b/examples/stm32/f1/stm32-h103/timer/Makefile new file mode 100644 index 0000000..86aced4 --- /dev/null +++ b/examples/stm32/f1/stm32-h103/timer/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 = timer + +include ../../Makefile.include + diff --git a/examples/stm32/f1/stm32-h103/timer/timer.c b/examples/stm32/f1/stm32-h103/timer/timer.c new file mode 100644 index 0000000..48cae12 --- /dev/null +++ b/examples/stm32/f1/stm32-h103/timer/timer.c @@ -0,0 +1,183 @@ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2011 Piotr Esden-Tempski + * + * 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 +#include +#include +#include + +u16 frequency_sequence[18] = { + 1000, + 500, + 1000, + 500, + 1000, + 500, + 2000, + 500, + 2000, + 500, + 2000, + 500, + 1000, + 500, + 1000, + 500, + 1000, + 5000 +}; + + +int frequency_sel = 0; + +u16 compare_time; +u16 new_time; +u16 frequency; +int debug = 0; + +void clock_setup(void) +{ + rcc_clock_setup_in_hse_8mhz_out_72mhz(); + +} + +void gpio_setup(void) +{ + /* Enable GPIOC clock. */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN); + + /* + * Set GPIO12 (PORTC) (led) to + * 'output alternate function push-pull'. + */ + gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, + GPIO_CNF_OUTPUT_PUSHPULL, GPIO12); + + gpio_set(GPIOC, GPIO12); + +} + +void tim_setup(void) +{ + + /* Enable TIM2 clock. */ + rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_TIM2EN); + + + /* Enable TIM2 interrupt. */ + nvic_enable_irq(NVIC_TIM2_IRQ); + + /* Reset TIM2 peripheral */ + timer_reset(TIM2); + + /* Timer global mode: + * - No divider + * - alignment edge + * - direction up + */ + timer_set_mode(TIM2, TIM_CR1_CKD_CK_INT, + TIM_CR1_CMS_EDGE, + TIM_CR1_DIR_UP); + + /* Reset prescaler value. */ + timer_set_prescaler(TIM2, 36000); + + /* Enable preload. */ + timer_disable_preload(TIM2); + + /* Continous mode. */ + timer_continuous_mode(TIM2); + + /* Period (36kHz) */ + timer_set_period(TIM2, 65535); + + /* Disable outputs. */ + timer_disable_oc_output(TIM2, TIM_OC1); + timer_disable_oc_output(TIM2, TIM_OC2); + timer_disable_oc_output(TIM2, TIM_OC3); + timer_disable_oc_output(TIM2, TIM_OC4); + + /* -- OC1 configuration -- */ + + /* Configure global mode of line 1. */ + timer_disable_oc_clear(TIM2, TIM_OC1); + timer_disable_oc_preload(TIM2, TIM_OC1); + timer_set_oc_slow_mode(TIM2, TIM_OC1); + timer_set_oc_mode(TIM2, TIM_OC1, TIM_OCM_FROZEN); + + /* Set the capture compare value for OC1. */ + timer_set_oc_value(TIM2, TIM_OC1, 1000); + + /* ---- */ + /* ARR reload enable */ + timer_disable_preload(TIM2); + + /* Counter enable */ + timer_enable_counter(TIM2); + + /* Enable commutation interrupt */ + timer_enable_irq(TIM2, TIM_DIER_CC1IE); +} + +void tim2_isr(void) +{ + + if (timer_get_flag(TIM2, TIM_SR_CC1IF)) { + + /* Clear compare interrupt flag. */ + timer_clear_flag(TIM2, TIM_SR_CC1IF); + + /* + * Get current timer value to calculate next + * compare register value + */ + compare_time = timer_get_counter(TIM2); + + /* + * Calculate and set the next compare value. + */ + frequency = frequency_sequence[frequency_sel++]; + new_time = compare_time + frequency; + + timer_set_oc_value(TIM2, TIM_OC1, + new_time); + if (frequency_sel == 18) { + frequency_sel = 0; + } + + /* Toggle led to indicate compare event */ + gpio_toggle(GPIOC, GPIO12); + + } +} + +int main(void) +{ + + clock_setup(); + gpio_setup(); + tim_setup(); + + while (1) { + __asm("nop"); + } + + return 0; +} diff --git a/examples/stm32/f1/stm32-h103/timer/timer.ld b/examples/stm32/f1/stm32-h103/timer/timer.ld new file mode 100644 index 0000000..3409b98 --- /dev/null +++ b/examples/stm32/f1/stm32-h103/timer/timer.ld @@ -0,0 +1,31 @@ +/* + * 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 . + */ + +/* Linker script for Olimex STM32-H103 (STM32F103RBT6, 128K flash, 20K RAM). */ + +/* Define memory regions. */ +MEMORY +{ + rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K + ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K +} + +/* Include the common ld script. */ +INCLUDE libopencm3_stm32f1.ld + -- cgit v1.2.3