[libopenstm32-devel] Complete RTC functions

[Lord J. <lor...@y7...>]

/*
 * This file is part of the libopenstm32 project.
 *
 * Copyright (C) 2009 Uwe Hermann <uw...@he...>
 *
 * 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/gpio.h>
#include <libopenstm32/usart.h>
#include <libopenstm32/rtc.h>
#include <libopenstm32/power.h>
#include <libopenstm32/nvic.h>

void clock_setup(void)
{
	rcc_clock_setup_in_hse_8mhz_out_72mhz();

	/* Enable GPIOC clock. */
	rcc_peripheral_enable_clock(&RCC_APB2ENR, IOPCEN);

	/* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
	rcc_peripheral_enable_clock(&RCC_APB2ENR, IOPAEN);
	rcc_peripheral_enable_clock(&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);
	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 GPIO12 (in GPIO port C) to 'output push-pull'. */
	gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
		      GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
}

void nvic_setup()
{
	/* 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, GPIO12);
	/*Let c be the currecnt counter value */
	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(USART1, '1');
		} else {
			usart_send(USART1, '0');
		}
	}	
	usart_send(USART1, '\n');
}

int main(void)
{
	/* Start the clocks */
	clock_setup();
	/* Setup the GPIOs */
	gpio_setup();
	/* Setup the USART module */
	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);
	/* 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;
}