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Initial commit.

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This commit is contained in:
Piotr Esden-Tempski
2013-04-19 17:19:32 -07:00
commit 9d5526f773
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examples/stm32/f1/stm32vl-discovery/rtc/Makefile Normal file
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##
## This file is part of the libopencm3 project.
##
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
##
## 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 = rtc
LDSCRIPT = ../stm32vl-discovery.ld
include ../../Makefile.include

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examples/stm32/f1/stm32vl-discovery/rtc/README Normal file
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------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This is a small RTC example project.
It blinks the ST STM32VLDISCOVERY's blue LED at 1Hz, and sends the value of
the RTC counter register down the serial line (PA9) at 38400,8N1.

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examples/stm32/f1/stm32vl-discovery/rtc/rtc.c Normal file
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/*
* 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 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/f1/rcc.h>
#include <libopencm3/stm32/f1/gpio.h>
#include <libopencm3/stm32/rtc.h>
#include <libopencm3/stm32/usart.h>
#include <libopencm3/stm32/pwr.h>
#include <libopencm3/cm3/nvic.h>
static 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);
}
static 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);
}
static void gpio_setup(void)
{
/* Set GPIO8 (in GPIO port C) to 'output push-pull'. */
/* This drives the blue LED on the STM32VLDISCOVERY. */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO8);
}
static 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;
}