Added timer_interrupt example.
This commit is contained in:
Thomas Otto
parent
9dc0af94b0
commit
e50b836ada
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@ -24,7 +24,7 @@ Q := @
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MAKEFLAGS += --no-print-directory
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endif
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all: i2c_stts75_sensor adc_temperature_sensor dma_mem2mem
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all: i2c_stts75_sensor adc_temperature_sensor dma_mem2mem timer_interrupt
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i2c_stts75_sensor:
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@printf " BUILD examples/other/i2c_stts75_sensor\n"
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@ -38,6 +38,10 @@ dma_mem2mem:
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@printf " BUILD examples/other/dma_mem2mem\n"
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$(Q)$(MAKE) -C dma_mem2mem
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timer_interrupt:
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@printf " BUILD examples/other/timer_interrupt\n"
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$(Q)$(MAKE) -C timer_interrupt
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clean:
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@printf " CLEAN examples/other/i2c_stts75_sensor\n"
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$(Q)$(MAKE) -C i2c_stts75_sensor clean
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@ -45,6 +49,8 @@ clean:
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$(Q)$(MAKE) -C adc_temperature_sensor clean
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@printf " CLEAN examples/other/dma_mem2mem\n"
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$(Q)$(MAKE) -C dma_mem2mem clean
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@printf " CLEAN examples/other/timer_interrupt\n"
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$(Q)$(MAKE) -C timer_interrupt clean
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.PHONY: i2c_stts75_sensor adc_temperature_sensor dma_mem2mem clean
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.PHONY: i2c_stts75_sensor adc_temperature_sensor dma_mem2mem timer_interrupt clean
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@ -0,0 +1,95 @@
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##
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## This file is part of the libopenstm32 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 program is free software: you can redistribute it and/or modify
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## it under the terms of the GNU 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 program 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 General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with this program. If not, see <http://www.gnu.org/licenses/>.
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##
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BINARY = timer
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# PREFIX ?= arm-none-eabi
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PREFIX ?= arm-elf
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CC = $(PREFIX)-gcc
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LD = $(PREFIX)-ld
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OBJCOPY = $(PREFIX)-objcopy
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OBJDUMP = $(PREFIX)-objdump
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# Uncomment this line if you want to use the installed (not local) library.
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#TOOLCHAIN_DIR = `dirname \`which $(CC)\``/..
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TOOLCHAIN_DIR = ../../..
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CFLAGS = -O0 -g -Wall -Wextra -I$(TOOLCHAIN_DIR)/include -fno-common \
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-mcpu=cortex-m3 -mthumb
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LDSCRIPT = $(BINARY).ld
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LDFLAGS = -L$(TOOLCHAIN_DIR)/lib -T$(LDSCRIPT) -nostartfiles
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OBJS = $(BINARY).o
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OPENOCD_BASE = /usr
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OPENOCD = $(OPENOCD_BASE)/bin/openocd
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OPENOCD_SCRIPTS = $(OPENOCD_BASE)/share/openocd/scripts
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OPENOCD_FLASHER = $(OPENOCD_SCRIPTS)/interface/jtagkey.cfg
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OPENOCD_BOARD = $(OPENOCD_SCRIPTS)/target/stm32.cfg
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# Be silent per default, but 'make V=1' will show all compiler calls.
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ifneq ($(V),1)
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Q := @
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NULL := 2>/dev/null
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endif
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all: images
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images: $(BINARY)
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@printf " OBJCOPY $(BINARY).bin\n"
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$(Q)$(OBJCOPY) -Obinary $(BINARY) $(BINARY).bin
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@printf " OBJCOPY $(BINARY).hex\n"
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$(Q)$(OBJCOPY) -Oihex $(BINARY) $(BINARY).hex
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@printf " OBJCOPY $(BINARY).srec\n"
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$(Q)$(OBJCOPY) -Osrec $(BINARY) $(BINARY).srec
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@printf " OBJDUMP $(BINARY).list\n"
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$(Q)$(OBJDUMP) -S $(BINARY) > $(BINARY).list
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$(BINARY): $(OBJS) $(LDSCRIPT)
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@printf " LD $(subst $(shell pwd)/,,$(@))\n"
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$(Q)$(LD) $(LDFLAGS) -o $(BINARY) $(OBJS) -lopenstm32
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%.o: %.c Makefile
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@printf " CC $(subst $(shell pwd)/,,$(@))\n"
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$(Q)$(CC) $(CFLAGS) -o $@ -c $<
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clean:
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@printf " CLEAN $(subst $(shell pwd)/,,$(OBJS))\n"
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$(Q)rm -f *.o
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@printf " CLEAN $(BINARY)\n"
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$(Q)rm -f $(BINARY)
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@printf " CLEAN $(BINARY).bin\n"
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$(Q)rm -f $(BINARY).bin
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@printf " CLEAN $(BINARY).hex\n"
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$(Q)rm -f $(BINARY).hex
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@printf " CLEAN $(BINARY).srec\n"
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$(Q)rm -f $(BINARY).srec
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@printf " CLEAN $(BINARY).list\n"
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$(Q)rm -f $(BINARY).list
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flash: images
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@printf " FLASH $(BINARY).bin\n"
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@# IMPORTANT: Don't use "resume", only "reset" will work correctly!
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$(Q)$(OPENOCD) -s $(OPENOCD_SCRIPTS) \
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-f $(OPENOCD_FLASHER) \
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-f $(OPENOCD_BOARD) \
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-c "init" -c "reset halt" \
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-c "flash write_image erase $(BINARY).hex" \
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-c "reset" \
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-c "shutdown" $(NULL)
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.PHONY: images clean
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@ -0,0 +1,43 @@
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------------------------------------------------------------------------------
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README
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------------------------------------------------------------------------------
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This example program blinks a LED on PortB Pin 6. 1 second on / 1 second off.
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Blinking is made only with timer interrupt from TIM2 timer.
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Building
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--------
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$ make
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Running 'make' on the top-level libopenstm32 directory will automatically
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also build this example. Or you can build the library "manually" and
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then run 'make' in this directory.
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You may want to override the toolchain (e.g., arm-elf or arm-none-eabi):
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$ PREFIX=arm-none-eabi make
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For a more verbose build you can use
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$ make V=1
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Flashing
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--------
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You can flash the generated code using OpenOCD:
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$ make flash
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Or you can do the same manually via:
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$ openocd -f interface/jtagkey-tiny.cfg -f target/stm32.cfg
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$ telnet localhost 4444
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> reset halt
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> flash write_image erase timer.hex
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> reset
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Replace the "jtagkey-tiny.cfg" with whatever JTAG device you are using, and/or
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replace "stm.cfg" with your respective config file.
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@ -0,0 +1,127 @@
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/*
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* This file is part of the libopenstm32 project.
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*
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* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU 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 program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopenstm32/rcc.h>
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#include <libopenstm32/flash.h>
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#include <libopenstm32/gpio.h>
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#include <libopenstm32/usart.h>
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#include <libopenstm32/timer.h>
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#include <libopenstm32/nvic.h>
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/* Set STM32 to 72 MHz. HSE 16MHz */
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void clock_setup(void)
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{
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/* enable Internal High Speed Oscillator */
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rcc_osc_on(HSI);
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rcc_wait_for_osc_ready(HSI);
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/* Select HSI as SYSCLK source. */
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rcc_set_sysclk_source(SW_SYSCLKSEL_HSICLK);
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/* enable External High Speed Oscillator 16MHz */
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rcc_osc_on(HSE);
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rcc_wait_for_osc_ready(HSE);
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rcc_set_sysclk_source(SW_SYSCLKSEL_HSECLK);
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/* set prescalers for ADC, ABP1, ABP2... make this before touching the PLL */
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rcc_set_hpre(HPRE_SYSCLK_NODIV); //prescales the AHB clock from the SYSCLK
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rcc_set_adcpre(ADCPRE_PLCK2_DIV6); //prescales the ADC from the APB2 clock; max 14MHz
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rcc_set_ppre1(PPRE1_HCLK_DIV2); //prescales the APB1 from the AHB clock; max 36MHz
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rcc_set_ppre2(PPRE2_HCLK_NODIV); //prescales the APB2 from the AHB clock; max 72MHz
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/* sysclk should run with 72MHz -> 2 Waitstates ; choose 0WS from 0-24MHz, 1WS from 24-48MHz, 2WS from 48-72MHz */
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flash_set_ws(FLASH_LATENCY_2WS);
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/* Set the PLL multiplication factor to 9. -> 16MHz (external) * 9 (multiplier) / 2 (PLLXTPRE_HSE_CLK_DIV2) = 72MHz */
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rcc_set_pll_multiplication_factor(PLLMUL_PLL_CLK_MUL9);
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/* Select HSI as PLL source. */
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rcc_set_pll_source(PLLSRC_HSE_CLK);
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/* divide external frequency by 2 before entering pll (only valid/needed for HSE) */
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rcc_set_pllxtpre(PLLXTPRE_HSE_CLK_DIV2);
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/* Enable PLL oscillator and wait for it to stabilize. */
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rcc_osc_on(PLL);
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rcc_wait_for_osc_ready(PLL);
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/* Select PLL as SYSCLK source. */
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rcc_set_sysclk_source(SW_SYSCLKSEL_PLLCLK);
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}
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void gpio_setup(void)
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{
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/* Enable GPIOB clock. */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, IOPBEN);
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/* Set GPIO6/7 (in GPIO port B) to 'output push-pull' for the LEDs. */
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO6);
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO7);
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}
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void nvic_setup()
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{
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/* without this the timer intterrupt routing will newer be called */
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nvic_enable_irq(NVIC_TIM2_IRQ);
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nvic_set_priority(NVIC_TIM2_IRQ, 1);
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}
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void tim2_isr()
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{
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/* LED2 on/off */
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gpio_toggle(GPIOB, GPIO6);
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/* clear interrrupt flag */
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TIM_SR(TIM2) &= ~TIM_SR_UIF;
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}
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int main(void)
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{
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clock_setup();
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gpio_setup();
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nvic_setup();
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gpio_clear(GPIOB, GPIO7); /* LED1 on */
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gpio_set(GPIOB, GPIO6); /* LED2 off */
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rcc_peripheral_enable_clock(&RCC_APB1ENR, TIM2EN);
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/* the goal is to let the LED2 glow for a second and then be off for a second */
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/* Set timer start value */
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TIM_CNT(TIM2) = 1;
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/* Set timer prescaler. 72MHz/1440 => 50000 counts per second */
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TIM_PSC(TIM2) = 1440;
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/* End timer value. If this value is reached an interrupt is generated */
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TIM_ARR(TIM2) = 50000;
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/* Update interrupt enable */
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TIM_DIER(TIM2) |= TIM_DIER_UIE;
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/* Start timer */
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TIM_CR1(TIM2) |= TIM_CR1_CEN;
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while(1); /* Halt. */
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return 0;
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}
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@ -0,0 +1,31 @@
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/*
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* This file is part of the libopenstm32 project.
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*
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* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU 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 program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Linker script for an STM32F103RBT6 board (128K flash, 20K RAM). */
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/* Define memory regions. */
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MEMORY
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{
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rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
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ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
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}
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/* Include the common ld script from libopenstm32. */
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INCLUDE libopenstm32.ld
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