From e50b836ada3110bdcb940b75624fdad47edc3056 Mon Sep 17 00:00:00 2001 From: Thomas Otto Date: Sun, 28 Mar 2010 16:11:45 +0200 Subject: [PATCH] Added timer_interrupt example. --- examples/other/Makefile | 10 +- examples/other/timer_interrupt/Makefile | 95 ++++++++++++++++++ examples/other/timer_interrupt/README | 43 ++++++++ examples/other/timer_interrupt/timer.c | 127 ++++++++++++++++++++++++ examples/other/timer_interrupt/timer.ld | 31 ++++++ 5 files changed, 304 insertions(+), 2 deletions(-) create mode 100644 examples/other/timer_interrupt/Makefile create mode 100644 examples/other/timer_interrupt/README create mode 100644 examples/other/timer_interrupt/timer.c create mode 100644 examples/other/timer_interrupt/timer.ld diff --git a/examples/other/Makefile b/examples/other/Makefile index f4b73a72..208578da 100644 --- a/examples/other/Makefile +++ b/examples/other/Makefile @@ -24,7 +24,7 @@ Q := @ MAKEFLAGS += --no-print-directory endif -all: i2c_stts75_sensor adc_temperature_sensor dma_mem2mem +all: i2c_stts75_sensor adc_temperature_sensor dma_mem2mem timer_interrupt i2c_stts75_sensor: @printf " BUILD examples/other/i2c_stts75_sensor\n" @@ -38,6 +38,10 @@ dma_mem2mem: @printf " BUILD examples/other/dma_mem2mem\n" $(Q)$(MAKE) -C dma_mem2mem +timer_interrupt: + @printf " BUILD examples/other/timer_interrupt\n" + $(Q)$(MAKE) -C timer_interrupt + clean: @printf " CLEAN examples/other/i2c_stts75_sensor\n" $(Q)$(MAKE) -C i2c_stts75_sensor clean @@ -45,6 +49,8 @@ clean: $(Q)$(MAKE) -C adc_temperature_sensor clean @printf " CLEAN examples/other/dma_mem2mem\n" $(Q)$(MAKE) -C dma_mem2mem clean + @printf " CLEAN examples/other/timer_interrupt\n" + $(Q)$(MAKE) -C timer_interrupt clean -.PHONY: i2c_stts75_sensor adc_temperature_sensor dma_mem2mem clean +.PHONY: i2c_stts75_sensor adc_temperature_sensor dma_mem2mem timer_interrupt clean diff --git a/examples/other/timer_interrupt/Makefile b/examples/other/timer_interrupt/Makefile new file mode 100644 index 00000000..b01d8591 --- /dev/null +++ b/examples/other/timer_interrupt/Makefile @@ -0,0 +1,95 @@ +## +## This file is part of the libopenstm32 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 + +# PREFIX ?= arm-none-eabi +PREFIX ?= arm-elf +CC = $(PREFIX)-gcc +LD = $(PREFIX)-ld +OBJCOPY = $(PREFIX)-objcopy +OBJDUMP = $(PREFIX)-objdump +# Uncomment this line if you want to use the installed (not local) library. +#TOOLCHAIN_DIR = `dirname \`which $(CC)\``/.. +TOOLCHAIN_DIR = ../../.. +CFLAGS = -O0 -g -Wall -Wextra -I$(TOOLCHAIN_DIR)/include -fno-common \ + -mcpu=cortex-m3 -mthumb +LDSCRIPT = $(BINARY).ld +LDFLAGS = -L$(TOOLCHAIN_DIR)/lib -T$(LDSCRIPT) -nostartfiles +OBJS = $(BINARY).o + +OPENOCD_BASE = /usr +OPENOCD = $(OPENOCD_BASE)/bin/openocd +OPENOCD_SCRIPTS = $(OPENOCD_BASE)/share/openocd/scripts +OPENOCD_FLASHER = $(OPENOCD_SCRIPTS)/interface/jtagkey.cfg +OPENOCD_BOARD = $(OPENOCD_SCRIPTS)/target/stm32.cfg + +# Be silent per default, but 'make V=1' will show all compiler calls. +ifneq ($(V),1) +Q := @ +NULL := 2>/dev/null +endif + +all: images + +images: $(BINARY) + @printf " OBJCOPY $(BINARY).bin\n" + $(Q)$(OBJCOPY) -Obinary $(BINARY) $(BINARY).bin + @printf " OBJCOPY $(BINARY).hex\n" + $(Q)$(OBJCOPY) -Oihex $(BINARY) $(BINARY).hex + @printf " OBJCOPY $(BINARY).srec\n" + $(Q)$(OBJCOPY) -Osrec $(BINARY) $(BINARY).srec + @printf " OBJDUMP $(BINARY).list\n" + $(Q)$(OBJDUMP) -S $(BINARY) > $(BINARY).list + +$(BINARY): $(OBJS) $(LDSCRIPT) + @printf " LD $(subst $(shell pwd)/,,$(@))\n" + $(Q)$(LD) $(LDFLAGS) -o $(BINARY) $(OBJS) -lopenstm32 + +%.o: %.c Makefile + @printf " CC $(subst $(shell pwd)/,,$(@))\n" + $(Q)$(CC) $(CFLAGS) -o $@ -c $< + +clean: + @printf " CLEAN $(subst $(shell pwd)/,,$(OBJS))\n" + $(Q)rm -f *.o + @printf " CLEAN $(BINARY)\n" + $(Q)rm -f $(BINARY) + @printf " CLEAN $(BINARY).bin\n" + $(Q)rm -f $(BINARY).bin + @printf " CLEAN $(BINARY).hex\n" + $(Q)rm -f $(BINARY).hex + @printf " CLEAN $(BINARY).srec\n" + $(Q)rm -f $(BINARY).srec + @printf " CLEAN $(BINARY).list\n" + $(Q)rm -f $(BINARY).list + +flash: images + @printf " FLASH $(BINARY).bin\n" + @# IMPORTANT: Don't use "resume", only "reset" will work correctly! + $(Q)$(OPENOCD) -s $(OPENOCD_SCRIPTS) \ + -f $(OPENOCD_FLASHER) \ + -f $(OPENOCD_BOARD) \ + -c "init" -c "reset halt" \ + -c "flash write_image erase $(BINARY).hex" \ + -c "reset" \ + -c "shutdown" $(NULL) + +.PHONY: images clean + diff --git a/examples/other/timer_interrupt/README b/examples/other/timer_interrupt/README new file mode 100644 index 00000000..a41ebbb8 --- /dev/null +++ b/examples/other/timer_interrupt/README @@ -0,0 +1,43 @@ +------------------------------------------------------------------------------ +README +------------------------------------------------------------------------------ + +This example program blinks a LED on PortB Pin 6. 1 second on / 1 second off. +Blinking is made only with timer interrupt from TIM2 timer. + +Building +-------- + + $ make + +Running 'make' on the top-level libopenstm32 directory will automatically +also build this example. Or you can build the library "manually" and +then run 'make' in this directory. + +You may want to override the toolchain (e.g., arm-elf or arm-none-eabi): + + $ PREFIX=arm-none-eabi make + +For a more verbose build you can use + + $ make V=1 + + +Flashing +-------- + +You can flash the generated code using OpenOCD: + + $ make flash + +Or you can do the same manually via: + + $ openocd -f interface/jtagkey-tiny.cfg -f target/stm32.cfg + $ telnet localhost 4444 + > reset halt + > flash write_image erase timer.hex + > reset + +Replace the "jtagkey-tiny.cfg" with whatever JTAG device you are using, and/or +replace "stm.cfg" with your respective config file. + diff --git a/examples/other/timer_interrupt/timer.c b/examples/other/timer_interrupt/timer.c new file mode 100644 index 00000000..e1db7e30 --- /dev/null +++ b/examples/other/timer_interrupt/timer.c @@ -0,0 +1,127 @@ +/* + * This file is part of the libopenstm32 project. + * + * Copyright (C) 2010 Thomas Otto + * + * 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 +#include + +/* Set STM32 to 72 MHz. HSE 16MHz */ +void clock_setup(void) +{ + /* enable Internal High Speed Oscillator */ + rcc_osc_on(HSI); + rcc_wait_for_osc_ready(HSI); + + /* Select HSI as SYSCLK source. */ + rcc_set_sysclk_source(SW_SYSCLKSEL_HSICLK); + + /* enable External High Speed Oscillator 16MHz */ + rcc_osc_on(HSE); + rcc_wait_for_osc_ready(HSE); + rcc_set_sysclk_source(SW_SYSCLKSEL_HSECLK); + + /* set prescalers for ADC, ABP1, ABP2... make this before touching the PLL */ + rcc_set_hpre(HPRE_SYSCLK_NODIV); //prescales the AHB clock from the SYSCLK + rcc_set_adcpre(ADCPRE_PLCK2_DIV6); //prescales the ADC from the APB2 clock; max 14MHz + rcc_set_ppre1(PPRE1_HCLK_DIV2); //prescales the APB1 from the AHB clock; max 36MHz + rcc_set_ppre2(PPRE2_HCLK_NODIV); //prescales the APB2 from the AHB clock; max 72MHz + + /* sysclk should run with 72MHz -> 2 Waitstates ; choose 0WS from 0-24MHz, 1WS from 24-48MHz, 2WS from 48-72MHz */ + flash_set_ws(FLASH_LATENCY_2WS); + + /* Set the PLL multiplication factor to 9. -> 16MHz (external) * 9 (multiplier) / 2 (PLLXTPRE_HSE_CLK_DIV2) = 72MHz */ + rcc_set_pll_multiplication_factor(PLLMUL_PLL_CLK_MUL9); + + /* Select HSI as PLL source. */ + rcc_set_pll_source(PLLSRC_HSE_CLK); + + /* divide external frequency by 2 before entering pll (only valid/needed for HSE) */ + rcc_set_pllxtpre(PLLXTPRE_HSE_CLK_DIV2); + + /* Enable PLL oscillator and wait for it to stabilize. */ + rcc_osc_on(PLL); + rcc_wait_for_osc_ready(PLL); + + /* Select PLL as SYSCLK source. */ + rcc_set_sysclk_source(SW_SYSCLKSEL_PLLCLK); +} + +void gpio_setup(void) +{ + /* Enable GPIOB clock. */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, IOPBEN); + + /* Set GPIO6/7 (in GPIO port B) to 'output push-pull' for the LEDs. */ + gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ, + GPIO_CNF_OUTPUT_PUSHPULL, GPIO6); + gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ, + GPIO_CNF_OUTPUT_PUSHPULL, GPIO7); +} + +void nvic_setup() +{ + /* without this the timer intterrupt routing will newer be called */ + nvic_enable_irq(NVIC_TIM2_IRQ); + nvic_set_priority(NVIC_TIM2_IRQ, 1); +} + +void tim2_isr() +{ + /* LED2 on/off */ + gpio_toggle(GPIOB, GPIO6); + + /* clear interrrupt flag */ + TIM_SR(TIM2) &= ~TIM_SR_UIF; +} + +int main(void) +{ + clock_setup(); + gpio_setup(); + nvic_setup(); + + gpio_clear(GPIOB, GPIO7); /* LED1 on */ + gpio_set(GPIOB, GPIO6); /* LED2 off */ + + rcc_peripheral_enable_clock(&RCC_APB1ENR, TIM2EN); + + /* the goal is to let the LED2 glow for a second and then be off for a second */ + + /* Set timer start value */ + TIM_CNT(TIM2) = 1; + + /* Set timer prescaler. 72MHz/1440 => 50000 counts per second */ + TIM_PSC(TIM2) = 1440; + + /* End timer value. If this value is reached an interrupt is generated */ + TIM_ARR(TIM2) = 50000; + + /* Update interrupt enable */ + TIM_DIER(TIM2) |= TIM_DIER_UIE; + + /* Start timer */ + TIM_CR1(TIM2) |= TIM_CR1_CEN; + + while(1); /* Halt. */ + + return 0; +} diff --git a/examples/other/timer_interrupt/timer.ld b/examples/other/timer_interrupt/timer.ld new file mode 100644 index 00000000..a1e9de5e --- /dev/null +++ b/examples/other/timer_interrupt/timer.ld @@ -0,0 +1,31 @@ +/* + * This file is part of the libopenstm32 project. + * + * Copyright (C) 2010 Thomas Otto + * + * 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 an STM32F103RBT6 board (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 from libopenstm32. */ +INCLUDE libopenstm32.ld +