Added little systick example.
This commit is contained in:
Thomas Otto
parent
905b5112b6
commit
7c32f63332
|
|
@ -42,6 +42,10 @@ timer_interrupt:
|
|||
@printf " BUILD examples/other/timer_interrupt\n"
|
||||
$(Q)$(MAKE) -C timer_interrupt
|
||||
|
||||
systick:
|
||||
@printf " BUILD examples/other/systick\n"
|
||||
$(Q)$(MAKE) -C systick
|
||||
|
||||
clean:
|
||||
@printf " CLEAN examples/other/i2c_stts75_sensor\n"
|
||||
$(Q)$(MAKE) -C i2c_stts75_sensor clean
|
||||
|
|
@ -51,6 +55,8 @@ clean:
|
|||
$(Q)$(MAKE) -C dma_mem2mem clean
|
||||
@printf " CLEAN examples/other/timer_interrupt\n"
|
||||
$(Q)$(MAKE) -C timer_interrupt clean
|
||||
@printf " CLEAN examples/other/systick\n"
|
||||
$(Q)$(MAKE) -C systick clean
|
||||
|
||||
.PHONY: i2c_stts75_sensor adc_temperature_sensor dma_mem2mem timer_interrupt clean
|
||||
.PHONY: i2c_stts75_sensor adc_temperature_sensor dma_mem2mem timer_interrupt systick clean
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,95 @@
|
|||
##
|
||||
## This file is part of the libopenstm32 project.
|
||||
##
|
||||
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
|
||||
##
|
||||
## 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 <http://www.gnu.org/licenses/>.
|
||||
##
|
||||
|
||||
BINARY = systick
|
||||
|
||||
# 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
|
||||
|
||||
|
|
@ -0,0 +1,43 @@
|
|||
------------------------------------------------------------------------------
|
||||
README
|
||||
------------------------------------------------------------------------------
|
||||
|
||||
This example program blinks a LED on PortB Pin 6. 1 second on / 1 second off.
|
||||
Blinking is done thru the systick timer interrupt.
|
||||
|
||||
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 systick.hex
|
||||
> reset
|
||||
|
||||
Replace the "jtagkey-tiny.cfg" with whatever JTAG device you are using, and/or
|
||||
replace "stm.cfg" with your respective config file.
|
||||
|
||||
|
|
@ -0,0 +1,116 @@
|
|||
/*
|
||||
* This file is part of the libopenstm32 project.
|
||||
*
|
||||
* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
|
||||
*
|
||||
* 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 <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#include <libopenstm32/rcc.h>
|
||||
#include <libopenstm32/flash.h>
|
||||
#include <libopenstm32/gpio.h>
|
||||
#include <libopenstm32/nvic.h>
|
||||
#include <libopenstm32/systick.h>
|
||||
|
||||
u32 temp32;
|
||||
|
||||
/* 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 sys_tick_handler()
|
||||
{
|
||||
temp32++;
|
||||
|
||||
/* we call this handler every 1ms so 1000ms = 1s on/off */
|
||||
if (temp32 == 1000) {
|
||||
gpio_toggle(GPIOB, GPIO6); /* LED2 on/off */
|
||||
temp32 = 0;
|
||||
}
|
||||
}
|
||||
|
||||
int main(void)
|
||||
{
|
||||
clock_setup();
|
||||
gpio_setup();
|
||||
|
||||
gpio_clear(GPIOB, GPIO7); /* LED1 on */
|
||||
gpio_set(GPIOB, GPIO6); /* LED2 off */
|
||||
|
||||
temp32 = 0;
|
||||
|
||||
/* 72MHz / 8 => 9000000 counts per second */
|
||||
systick_set_clocksource(STK_CTRL_CLKSOURCE_AHB_DIV8);
|
||||
|
||||
/* 9000000/9000 = 1000 overflows per second - every 1ms one interrupt */
|
||||
systick_set_reload(9000);
|
||||
|
||||
systick_interrupt_enable();
|
||||
|
||||
/* start counting */
|
||||
systick_counter_enable();
|
||||
|
||||
while(1); /* Halt. */
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -0,0 +1,31 @@
|
|||
/*
|
||||
* This file is part of the libopenstm32 project.
|
||||
*
|
||||
* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
|
||||
*
|
||||
* 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 <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
/* 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
|
||||
|
||||
Loading…
Reference in New Issue