Longan Nano RTC PA8 Interrupts

main.cpp

/****************************************************************************
**	OrangeBot  Project
*****************************************************************************
**        /
**       /
**      /
** ______ \
**         \
**          \
*****************************************************************************
**	Longan Nano Example - Blink RTC IST
*****************************************************************************
**	Author: 			Orso Eric
**	Version:
****************************************************************************/

/****************************************************************************
**	DESCRIPTION
*****************************************************************************
**	Blink the LEDs using the interrupt service rutine generated by the RTC timer
****************************************************************************/

/****************************************************************************
**	HYSTORY VERSION
*****************************************************************************
**		2020-07-05
**	Interrupt Service Routine working!
**		2020-07-06
**	Format source code
****************************************************************************/

/****************************************************************************
**	KNOWN BUG
*****************************************************************************
**
****************************************************************************/

/****************************************************************************
**	INCLUDE
****************************************************************************/

#include <gd32vf103.h>
//Onboard RBG LEDs of the Longan Nano
#include "longan_nano_led.hpp"

/****************************************************************************
**	NAMESPACES
****************************************************************************/

//using namespace std; 

/****************************************************************************
**	DEFINES
****************************************************************************/

//forEVER
#define EVER (;;)

/****************************************************************************
**	GLOBAL VARIABILE
****************************************************************************/

/****************************************************************************
**	FUNCTION PROTOTYPES
****************************************************************************/

//Initialize the board
extern bool init( void );
//Busy delay using the SysTick timer
extern void delay_us(unsigned int us);

/****************************************************************************
**	FUNCTION
****************************************************************************/

/***************************************************************************/
//!	@brief maim
//!	main | void
/***************************************************************************/
//!	@param delay | unsigned int | how long to wait for in microseconds
//! @return void |
//! @details \n
//!	Handles the ISR lines generated by the GPIO lines 5 to 9
/***************************************************************************/

int main( void )
{
	//----------------------------------------------------------------
	//	VARS
	//----------------------------------------------------------------

	bool f_ret = false;

	//----------------------------------------------------------------
	//	INIT
	//----------------------------------------------------------------

	//Initialize the board and return success status
	f_ret |= init();

	//----------------------------------------------------------------
	//	MAIN LOOP
	//----------------------------------------------------------------

	for EVER
	{
		//Toggle the RED LED
		//Longan_nano::Leds::toggle( Longan_nano::Led_color::RED );
		//2Hz blink
		//delay_us(250000);
	}

	//----------------------------------------------------------------
	//	RETURN
	//----------------------------------------------------------------

	return 0;
}	//End function: main

/***************************************************************************/
//!	@brief utility
//!	delay_us
/***************************************************************************/
//!	@param delay | unsigned int | how long to wait for in microseconds
//! @return void |
//! @details \n
//!	Use the SysTic timer counter to busy wait for the correct number of microseconds
/***************************************************************************/

void delay_us(unsigned int delay)
{
	//----------------------------------------------------------------
	//	VARS
	//----------------------------------------------------------------

	uint64_t start_mtime, delta_mtime;

	//----------------------------------------------------------------
	//	BODY
	//----------------------------------------------------------------
	//	Wait for the first tick
	//	Wait for the correct number of ticks

	uint64_t tmp = get_timer_value();
	do
	{
		start_mtime = get_timer_value();
	}
	while (start_mtime == tmp);

	do
	{
		delta_mtime = get_timer_value() - start_mtime;
	}
	while(delta_mtime <(SystemCoreClock/4000000.0 *delay ));

	//----------------------------------------------------------------
	//	RETURN
	//----------------------------------------------------------------

	return;
}	//End function: main