Added little systick example.

15 years ago · 7c32f63332
5 changed files with 292 additions and 1 deletions
--- a/examples/other/Makefile
+++ b/examples/other/Makefile
@ -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

--- a/examples/other/systick/Makefile
+++ b/examples/other/systick/Makefile
@ -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
+
--- a/examples/other/systick/README
+++ b/examples/other/systick/README
@ -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.
+
--- a/examples/other/systick/systick.c
+++ b/examples/other/systick/systick.c
@ -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;
+}
--- a/examples/other/systick/systick.ld
+++ b/examples/other/systick/systick.ld
@ -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
+