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Add some examples for the STM32-Discovery board. 

This adds a directory of examples, tested on the STM32-Discovery, just
modifications of: button, miniblink, fancyblink, usart, and rtc.

Thanks Marko Kraljevic <krasnaya.zvezda@gmail.com> for the patch!
This commit is contained in:
Uwe Hermann 2011-02-09 02:22:20 +01:00
parent 0a0ce22762
commit 62f3897a2e
22 changed files with 806 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
examples/stm32/Makefile
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@ -24,7 +24,11 @@ Q := @
MAKEFLAGS += --no-print-directory
endif
all: stm32-h103 stm32-h107 mb525 lisa-m obldc other
all: stm32-discovery stm32-h103 stm32-h107 mb525 lisa-m obldc other
stm32-discovery:
@printf " BUILD examples/stm32/stm32-discovery\n"
$(Q)$(MAKE) -C stm32-discovery
stm32-h103:
@printf " BUILD examples/stm32/stm32-h103\n"
@ -51,6 +55,8 @@ obldc:
$(Q)$(MAKE) -C obldc
clean:
@printf " CLEAN examples/stm32/stm32-discovery\n"
$(Q)$(MAKE) -C stm32-discovery clean
@printf " CLEAN examples/stm32/stm32-h103\n"
$(Q)$(MAKE) -C stm32-h103 clean
@printf " CLEAN examples/stm32/stm32-h107\n"
@ -64,5 +70,5 @@ clean:
@printf " CLEAN examples/stm32/obldc\n"
$(Q)$(MAKE) -C obldc clean
.PHONY: stm32-h103 stm32-h107 mb525 lisa-m other obldc clean
.PHONY: stm32-discovery stm32-h103 stm32-h107 mb525 lisa-m other obldc clean

62
examples/stm32/stm32-discovery/Makefile Normal file
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@ -0,0 +1,62 @@
##
## This file is part of the libopencm3 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/>.
##
# Be silent per default, but 'make V=1' will show all compiler calls.
ifneq ($(V),1)
Q := @
# Do not print "Entering directory ...".
MAKEFLAGS += --no-print-directory
endif
all: miniblink fancyblink usart button rtc
miniblink:
@printf " BUILD examples/stm32/stm32-discovery/miniblink\n"
$(Q)$(MAKE) -C miniblink
fancyblink:
@printf " BUILD examples/stm32/stm32-discovery/fancyblink\n"
$(Q)$(MAKE) -C fancyblink
usart:
@printf " BUILD examples/stm32/stm32-discovery/usart\n"
$(Q)$(MAKE) -C usart
button:
@printf " BUILD examples/stm32/stm32-discovery/button\n"
$(Q)$(MAKE) -C button
rtc:
@printf " BUILD examples/stm32/stm32-discovery/rtc\n"
$(Q)$(MAKE) -C rtc
clean:
@printf " CLEAN examples/stm32/stm32-discovery/miniblink\n"
$(Q)$(MAKE) -C miniblink clean
@printf " CLEAN examples/stm32/stm32-discovery/fancyblink\n"
$(Q)$(MAKE) -C fancyblink clean
@printf " CLEAN examples/stm32/stm32-discovery/usart\n"
$(Q)$(MAKE) -C usart clean
@printf " CLEAN examples/stm32/stm32-discovery/button\n"
$(Q)$(MAKE) -C button clean
@printf " CLEAN examples/stm32/stm32-discovery/rtc\n"
$(Q)$(MAKE) -C rtc clean
.PHONY: miniblink fancyblink usart button rtc clean

23
examples/stm32/stm32-discovery/button/Makefile Normal file
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@ -0,0 +1,23 @@
##
## This file is part of the libopencm3 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 = button
include ../../Makefile.include

6
examples/stm32/stm32-discovery/button/README Normal file
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@ -0,0 +1,6 @@
------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This example blinks the green LED on the discovery.
When you press the 'USER' button, the blinking is slower.

75
examples/stm32/stm32-discovery/button/button.c Normal file
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@ -0,0 +1,75 @@
/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>,
* Copyright (C) 2010 Piotr Esden-Tempski <piotr@esden.net>
*
* 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 <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
u16 exti_line_state;
/* Set STM32 to 24 MHz. */
void clock_setup(void)
{
rcc_clock_setup_in_hse_8mhz_out_24mhz();
}
void gpio_setup(void)
{
/* Enable GPIOC clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
/* Set GPIO9 (in GPIO port C) to 'output push-pull'. */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO9);
}
void button_setup(void)
{
/* Enable GPIOA clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
/* Set GPIO0 (in GPIO port A) to 'input open-drain'. */
gpio_set_mode(GPIOA, GPIO_MODE_INPUT,
GPIO_CNF_INPUT_FLOAT, GPIO0);
}
int main(void)
{
int i;
clock_setup();
gpio_setup();
button_setup();
/* Blink the LED (PC9) on the board. */
while (1) {
gpio_toggle(GPIOC, GPIO9);
exti_line_state = GPIOA_IDR;
if ((exti_line_state & (1 << 0)) != 0) {
for (i = 0; i < 800000; i++) /* Wait a bit. */
__asm__("nop");
}
for (i = 0; i < 800000; i++) /* Wait a bit. */
__asm__("nop");
}
return 0;
}

31
examples/stm32/stm32-discovery/button/button.ld Normal file
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@ -0,0 +1,31 @@
/*
* This file is part of the libopencm3 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/>.
*/
/* Linker script for Olimex STM32-H103 (STM32F103RBT6, 128K flash, 20K RAM). */
/* Define memory regions. */
MEMORY
{
rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
ram (rwx) : ORIGIN = 0x20000000, LENGTH = 8K
}
/* Include the common ld script. */
INCLUDE libopencm3_stm32.ld

23
examples/stm32/stm32-discovery/fancyblink/Makefile Normal file
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@ -0,0 +1,23 @@
##
## This file is part of the libopencm3 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 = fancyblink
include ../../Makefile.include

8
examples/stm32/stm32-discovery/fancyblink/README Normal file
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@ -0,0 +1,8 @@
------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This is the smallest-possible example program using libopencm3.
It's intended for the STM32 Discovery eval board. It should blink
the LEDs on the board.

61
examples/stm32/stm32-discovery/fancyblink/fancyblink.c Normal file
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@ -0,0 +1,61 @@
/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
* Copyright (C) 2011 Damjan Marion <damjan.marion@gmail.com>
* Copyright (C) 2011 Mark Panajotovic <marko@electrontube.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 <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
/* Set STM32 to 24 MHz. */
void clock_setup(void)
{
rcc_clock_setup_in_hse_8mhz_out_24mhz();
/* Enable GPIOC clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
}
void gpio_setup(void)
{
/* Set GPIO6/7 (in GPIO port C) to 'output push-pull'. */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO8);
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO9);
}
int main(void)
{
int i;
clock_setup();
gpio_setup();
/* Set one LED for wigwag effect when toggling. */
gpio_set(GPIOC, GPIO8);
/* Blink the LEDs (PC6 and PC7) on the board. */
while (1) {
gpio_toggle(GPIOC, GPIO8 | GPIO9); /* Toggle LEDs. */
for (i = 0; i < 2000000; i++) /* Wait a bit. */
__asm__("nop");
}
return 0;
}

31
examples/stm32/stm32-discovery/fancyblink/fancyblink.ld Normal file
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@ -0,0 +1,31 @@
/*
* This file is part of the libopencm3 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/>.
*/
/* Linker script for Olimex STM32-H103 (STM32F103RBT6, 128K flash, 20K RAM). */
/* Define memory regions. */
MEMORY
{
rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
ram (rwx) : ORIGIN = 0x20000000, LENGTH = 8K
}
/* Include the common ld script. */
INCLUDE libopencm3_stm32.ld

23
examples/stm32/stm32-discovery/miniblink/Makefile Normal file
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@ -0,0 +1,23 @@
##
## This file is part of the libopencm3 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 = miniblink
include ../../Makefile.include

9
examples/stm32/stm32-discovery/miniblink/README Normal file
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@ -0,0 +1,9 @@
------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This is the smallest-possible example program using libopencm3.
It's intended for the STM32 Discovery eval board. It should blink
the blue LED on the board.

71
examples/stm32/stm32-discovery/miniblink/miniblink.c Normal file
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@ -0,0 +1,71 @@
/*
* This file is part of the libopencm3 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/>.
*/
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
void gpio_setup(void)
{
/* Enable GPIOC clock. */
/* Manually: */
// RCC_APB2ENR |= RCC_APB2ENR_IOPCEN;
/* Using API functions: */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
/* Set GPIO12 (in GPIO port C) to 'output push-pull'. */
/* Manually: */
// GPIOC_CRH = (GPIO_CNF_OUTPUT_PUSHPULL << (((8 - 8) * 4) + 2));
// GPIOC_CRH |= (GPIO_MODE_OUTPUT_2_MHZ << ((8 - 8) * 4));
/* Using API functions: */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO8);
}
int main(void)
{
int i;
gpio_setup();
/* Blink the LED (PC8) on the board. */
while (1) {
/* Manually: */
// GPIOC_BSRR = GPIO8; /* LED off */
// for (i = 0; i < 800000; i++) /* Wait a bit. */
// __asm__("nop");
// GPIOC_BRR = GPIO8; /* LED on */
// for (i = 0; i < 800000; i++) /* Wait a bit. */
// __asm__("nop");
/* Using API functions gpio_set()/gpio_clear(): */
// gpio_set(GPIOC, GPIO8); /* LED off */
// for (i = 0; i < 800000; i++) /* Wait a bit. */
// __asm__("nop");
// gpio_clear(GPIOC, GPIO8); /* LED on */
// for (i = 0; i < 800000; i++) /* Wait a bit. */
// __asm__("nop");
/* Using API function gpio_toggle(): */
gpio_toggle(GPIOC, GPIO8); /* LED on/off */
for (i = 0; i < 800000; i++) /* Wait a bit. */
__asm__("nop");
}
return 0;
}

31
examples/stm32/stm32-discovery/miniblink/miniblink.ld Normal file
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@ -0,0 +1,31 @@
/*
* This file is part of the libopencm3 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/>.
*/
/* Linker script for Olimex STM32-H103 (STM32F103RBT6, 128K flash, 20K RAM). */
/* Define memory regions. */
MEMORY
{
rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
ram (rwx) : ORIGIN = 0x20000000, LENGTH = 8K
}
/* Include the common ld script. */
INCLUDE libopencm3_stm32.ld

23
examples/stm32/stm32-discovery/rtc/Makefile Normal file
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@ -0,0 +1,23 @@
##
## This file is part of the libopencm3 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 = rtc
include ../../Makefile.include

8
examples/stm32/stm32-discovery/rtc/README Normal file
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@ -0,0 +1,8 @@
------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This is a small RTC example project.
It blinks the Discovery's blue LED at 1Hz, and sends the value of the
RTC counter register down the serial line (PA9) at 38400,8N1.

129
examples/stm32/stm32-discovery/rtc/rtc.c Normal file
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@ -0,0 +1,129 @@
/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2010 Lord James <lordjames@y7mail.com>
* Copyright (C) 2011 Mark Panajotovic <marko@electrontube.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 <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/usart.h>
#include <libopencm3/stm32/rtc.h>
#include <libopencm3/stm32/pwr.h>
#include <libopencm3/stm32/nvic.h>
void clock_setup(void)
{
rcc_clock_setup_in_hse_8mhz_out_24mhz();
/* Enable GPIOC clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
/* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_USART1EN);
}
void usart_setup(void)
{
/* Setup GPIO pin GPIO_USART1_TX/GPIO9 on GPIO port A for transmit. */
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
/* Setup UART parameters. */
// usart_set_baudrate(USART1, 38400);
/* TODO usart_set_baudrate() doesn't support 24MHz clock (yet). */
/* This is the equivalent: */
USART_BRR(USART1) = (u16)((24000000 << 4) / (38400 * 16));
usart_set_databits(USART1, 8);
usart_set_stopbits(USART1, USART_STOPBITS_1);
usart_set_mode(USART1, USART_MODE_TX);
usart_set_parity(USART1, USART_PARITY_NONE);
usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
/* Finally enable the USART. */
usart_enable(USART1);
}
void gpio_setup(void)
{
/* Set GPIO8 (in GPIO port C) to 'output push-pull'. */
/* This drives the blue LED on the discovery. */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO8);
}
void nvic_setup(void)
{
/* Without this the RTC interrupt routine will never be called. */
nvic_enable_irq(NVIC_RTC_IRQ);
nvic_set_priority(NVIC_RTC_IRQ, 1);
}
void rtc_isr(void)
{
volatile u32 j = 0, c = 0;
/* The interrupt flag isn't cleared by hardware, we have to do it. */
rtc_clear_flag(RTC_SEC);
/* Visual output. */
gpio_toggle(GPIOC, GPIO8);
c = rtc_get_counter_val();
/* Display the current counter value in binary via USART1. */
for (j = 0; j < 32; j++) {
if ((c & (0x80000000 >> j)) != 0)
usart_send_blocking(USART1, '1');
else
usart_send_blocking(USART1, '0');
}
usart_send_blocking(USART1, '\n');
usart_send_blocking(USART1, '\r');
}
int main(void)
{
clock_setup();
gpio_setup();
usart_setup();
/*
* If the RTC is pre-configured just allow access, don't reconfigure.
* Otherwise enable it with the LSE as clock source and 0x7fff as
* prescale value.
*/
rtc_auto_awake(LSE, 0x7fff);
/* The above mode will not reset the RTC when you press the RST button.
* It will also continue to count while the MCU is held in reset. If
* you want it to reset, comment out the above and use the following:
*/
// rtc_awake_from_off(LSE);
// rtc_set_prescale_val(0x7fff);
/* Setup the RTC interrupt. */
nvic_setup();
/* Enable the RTC interrupt to occur off the SEC flag. */
rtc_interrupt_enable(RTC_SEC);
while(1);
return 0;
}

31
examples/stm32/stm32-discovery/rtc/rtc.ld Normal file
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@ -0,0 +1,31 @@
/*
* This file is part of the libopencm3 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/>.
*/
/* Linker script for Olimex STM32-H103 (STM32F103RBT6, 128K flash, 20K RAM). */
/* Define memory regions. */
MEMORY
{
rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
ram (rwx) : ORIGIN = 0x20000000, LENGTH = 8K
}
/* Include the common ld script. */
INCLUDE libopencm3_stm32.ld

23
examples/stm32/stm32-discovery/usart/Makefile Normal file
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@ -0,0 +1,23 @@
##
## This file is part of the libopencm3 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 = usart
include ../../Makefile.include

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examples/stm32/stm32-discovery/usart/README Normal file
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------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This example program sends some characters on USART1 on the ST STM32 Discovery
eval board.
The terminal settings for the receiving device/PC are 38400 8n1.
The sending is done in a blocking way in the code, see the usart_irq example
for a more elaborate USART example.

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examples/stm32/stm32-discovery/usart/usart.c Normal file
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/*
* This file is part of the libopencm3 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/>.
*/
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/usart.h>
void clock_setup(void)
{
rcc_clock_setup_in_hse_8mhz_out_24mhz();
/* Enable GPIOC clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
/* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_USART1EN);
}
void usart_setup(void)
{
/* Setup GPIO pin GPIO_USART1_TX/GPIO9 on GPIO port A for transmit. */
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
/* Setup UART parameters. */
// usart_set_baudrate(USART1, 38400);
/* TODO usart_set_baudrate() doesn't support 24MHz clock (yet). */
/* This is the equivalent: */
USART_BRR(USART1) = (u16)((24000000 << 4) / (38400 * 16));
usart_set_databits(USART1, 8);
usart_set_stopbits(USART1, USART_STOPBITS_1);
usart_set_mode(USART1, USART_MODE_TX);
usart_set_parity(USART1, USART_PARITY_NONE);
usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
/* Finally enable the USART. */
usart_enable(USART1);
}
void gpio_setup(void)
{
/* Set GPIO9 (in GPIO port C) to 'output push-pull'. [LED] */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO9);
}
int main(void)
{
int i, j = 0, c = 0;
clock_setup();
gpio_setup();
usart_setup();
/* Blink the LED (PC9) on the board with every transmitted byte. */
while (1) {
gpio_toggle(GPIOC, GPIO9); /* LED on/off */
usart_send_blocking(USART1, c + '0'); /* USART1: Send byte. */
c = (c == 9) ? 0 : c + 1; /* Increment c. */
if ((j++ % 80) == 0) { /* Newline after line full. */
usart_send_blocking(USART1, '\r');
usart_send_blocking(USART1, '\n');
}
for (i = 0; i < 800000; i++) /* Wait a bit. */
__asm__("NOP");
}
return 0;
}

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/*
* This file is part of the libopencm3 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/>.
*/
/* Linker script for Olimex STM32-H103 (STM32F103RBT6, 128K flash, 20K RAM). */
/* Define memory regions. */
MEMORY
{
rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
ram (rwx) : ORIGIN = 0x20000000, LENGTH = 8K
}
/* Include the common ld script. */
INCLUDE libopencm3_stm32.ld