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Nucleo F411RE - Simple USART example

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Same as the one for other boards
This commit is contained in:
Chuck McManis
2015-02-16 20:52:00 -08:00
committed by Piotr Esden-Tempski
parent 8019726f51
commit 4837775449
3 changed files with 131 additions and 0 deletions
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26
examples/stm32/f4/nucleo-f411re/usart/Makefile Normal file
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##
## This file is part of the libopencm3 project.
##
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
## Copyright (C) 2015 Chuck McManis <cmcmanis@mcmanis.com>
##
## This library is free software: you can redistribute it and/or modify
## it under the terms of the GNU Lesser General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This library 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 Lesser General Public License for more details.
##
## You should have received a copy of the GNU Lesser General Public License
## along with this library. If not, see <http://www.gnu.org/licenses/>.
##
BINARY = usart
LDSCRIPT = ../nucleo-f411re.ld
include ../../Makefile.include

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examples/stm32/f4/nucleo-f411re/usart/README.md Normal file
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# README
This example program sends repeating sequence of characters "0123456789" on
USART2 on the ST Nucleo F411RE eval board.
The sending is done in a blocking way.
Note that the Nucleo board exports the serial port as an ttyACM device on
Linux or a COM port on Windows. On Linux, if you can locate the correct
serial port as
/dev/serial/by-id/usb-STMicroelectronics_STM32_STLink_066CFF515056805087171825-if02
(note there will be differences based on the serial number of your board)
this may also show up as /dev/ttyACM0 if it was the first serial port
enumerated, if you have additional serial devices attached to the USB port
of your system they may show up as additional ttyACM1/ttyACM2/... etc.
Connect to the port using `screen /dev/ttyACM0 115200` where you replace
the serial port with the one for your system.

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examples/stm32/f4/nucleo-f411re/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>
* Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
* Copyright (C) 2015 Chuck McManis <cmcmanis@mcmanis.com>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/usart.h>
static void clock_setup(void)
{
/* Enable GPIOD clock for LED & USARTs. */
rcc_periph_clock_enable(RCC_GPIOA);
/* Enable clocks for USART2. */
rcc_periph_clock_enable(RCC_USART2);
}
static void usart_setup(void)
{
/* Setup USART2 parameters. */
usart_set_baudrate(USART2, 115200);
usart_set_databits(USART2, 8);
usart_set_stopbits(USART2, USART_STOPBITS_1);
usart_set_mode(USART2, USART_MODE_TX);
usart_set_parity(USART2, USART_PARITY_NONE);
usart_set_flow_control(USART2, USART_FLOWCONTROL_NONE);
/* Finally enable the USART. */
usart_enable(USART2);
}
static void gpio_setup(void)
{
/* Setup GPIO pin GPIO5 on GPIO port A for LED. */
gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO5);
/* Setup GPIO pins for USART2 transmit. */
gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO2);
/* Setup USART2 TX pin as alternate function. */
gpio_set_af(GPIOA, GPIO_AF7, GPIO2);
}
int main(void)
{
int i, j = 0, c = 0;
clock_setup();
gpio_setup();
usart_setup();
/* Blink the LED (PD12) on the board with every transmitted byte. */
while (1) {
gpio_toggle(GPIOA, GPIO5); /* LED on/off */
usart_send_blocking(USART2, c + '0'); /* USART2: Send byte. */
c = (c == 9) ? 0 : c + 1; /* Increment c. */
if ((j++ % 80) == 0) { /* Newline after line full. */
usart_send_blocking(USART2, '\r');
usart_send_blocking(USART2, '\n');
}
for (i = 0; i < 300000; i++) { /* Wait a bit. */
__asm__("NOP");
}
}
return 0;
}