Add a simple USART example project which sends some bytes.
This commit is contained in:
Uwe Hermann
parent
c6ec621b1a
commit
d20c3454fa
@ -25,7 +25,7 @@ ifneq ($(V),1)
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Q := @
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Q := @
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endif
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endif
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all: miniblink fancyblink
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all: miniblink fancyblink usart
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miniblink:
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miniblink:
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@printf " BUILD miniblink\n"
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@printf " BUILD miniblink\n"
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@ -35,11 +35,17 @@ fancyblink:
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@printf " BUILD fancyblink\n"
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@printf " BUILD fancyblink\n"
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$(Q)$(MAKE) -C fancyblink
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$(Q)$(MAKE) -C fancyblink
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usart:
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@printf " BUILD usart\n"
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$(Q)$(MAKE) -C usart
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clean:
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clean:
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@printf " CLEAN miniblink\n"
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@printf " CLEAN miniblink\n"
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$(Q)$(MAKE) -C miniblink clean
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$(Q)$(MAKE) -C miniblink clean
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@printf " CLEAN fancyblink\n"
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@printf " CLEAN fancyblink\n"
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$(Q)$(MAKE) -C fancyblink clean
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$(Q)$(MAKE) -C fancyblink clean
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@printf " CLEAN usart\n"
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$(Q)$(MAKE) -C usart clean
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.PHONY: miniblink fancyblink clean
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.PHONY: miniblink fancyblink usart clean
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89
examples/usart/Makefile
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89
examples/usart/Makefile
Normal file
@ -0,0 +1,89 @@
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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 = usart
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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 $(CC)\``/../$(PREFIX)
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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 = $(BINARY).o
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OPENOCD = openocd
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# Be silent per default, but 'make V=1' will show all compiler calls.
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ifneq ($(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) -f interface/jtagkey-tiny.cfg \
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-f board/olimex_stm32_h103.cfg \
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-c "init" -c "reset halt" \
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-c "flash write_image erase $(BINARY).bin 0x08000000" \
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-c "reset" \
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-c "shutdown" $(NULL)
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.PHONY: images clean
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48
examples/usart/README
Normal file
48
examples/usart/README
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@ -0,0 +1,48 @@
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------------------------------------------------------------------------------
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README
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------------------------------------------------------------------------------
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This example program sends some characters on USART3 on the ST STM32-based
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Olimex STM32-H103 eval board (see http://olimex.com/dev/stm32-h103.html
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for details).
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The terminal settings for the receiving device/PC are 38400 8n1.
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Building
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--------
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$ 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 on the STM32-H103 board 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 board/olimex_stm32_h103.cfg
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$ telnet localhost 4444
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> init
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> reset halt
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> flash write_image erase usart.bin 0x08000000
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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 "olimex_stm32_h103.cfg" with your respective board config file.
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101
examples/usart/usart.c
Normal file
101
examples/usart/usart.c
Normal file
@ -0,0 +1,101 @@
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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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#include <libopenstm32.h>
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void clock_setup(void)
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{
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/* Select HSI as SYSCLK source. */
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rcc_set_sysclk_source(SW_SYSCLKSEL_HSICLK);
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/* Set the PLL multiplication factor to 9. */
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rcc_set_pll_multiplication_factor(PLLMUL_PLL_CLK_MUL9);
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/* Select HSI/2 as PLL source. */
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rcc_set_pll_source(PLLSRC_HSI_CLK_DIV2);
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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 usart_setup(void)
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{
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/* Enable clocks for GPIO port B (for GPIO_USART_TX) and USART3. */
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rcc_enable_peripheral_clock(&RCC_APB2ENR, IOPBEN);
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rcc_enable_peripheral_clock(&RCC_APB1ENR, USART3EN);
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/* Setup GPIO pin GPIO_USART_TX/GPIO10 on GPIO port B for transmit. */
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART_TX);
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/* Setup UART parameters. */
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usart_set_baudrate(USART3, 38400);
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usart_set_databits(USART3, 8);
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usart_set_stopbits(USART3, STOPBITS_1);
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usart_set_mode(USART3, MODE_TX);
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usart_set_parity(USART3, PARITY_NONE);
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usart_set_flow_control(USART3, FLOWCONTROL_NONE);
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/* Finally enable the USART. */
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usart_enable(USART3);
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}
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void gpio_setup(void)
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{
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/* Enable GPIOC clock. */
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rcc_enable_peripheral_clock(&RCC_APB2ENR, IOPCEN);
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/* Set GPIO12 (in GPIO port C) to 'output push-pull'. */
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gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
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}
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int main(void)
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{
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int i, j = 0, c = 0;
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clock_setup();
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gpio_setup();
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usart_setup();
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/* Blink the LED (PC12) on the board with every transmitted byte. */
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while (1) {
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gpio_toggle(GPIOC, GPIO12); /* LED on/off */
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usart_send(USART3, c + '0'); /* Send one byte on USART3. */
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c = (c == 9) ? 0 : c + 1; /* Increment c. */
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if ((j++ % 80) == 0) { /* Newline after line full. */
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usart_send(USART3, '\r');
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usart_send(USART3, '\n');
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}
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for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */
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}
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return 0;
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}
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u32 *vector_table[2] __attribute__ ((section(".vectors"))) = {
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(u32 *)0x20000800, /* Use 2 KB stack (0x800 bytes). */
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(u32 *)main, /* Use main() as reset vector for now. */
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};
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31
examples/usart/usart.ld
Normal file
31
examples/usart/usart.ld
Normal file
@ -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) 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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/* Linker script for Olimex STM32-H103 (STM32F103RBT6, 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 = 0x00000000, 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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