/*
* 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;
}
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