/*File: FanAlm.c
 * Author: S-Tatsuno
 * Created on 2021/09/20, 13:07
 */
// PIC12F1840 Configuration Bit Settings
// 'C' source line config statements
// CONFIG1
#pragma config FOSC = INTOSC	// Oscillator Selection (INTOSC oscillator: I/O function on CLKIN pin)
#pragma config WDTE = OFF		// Watchdog Timer Enable (WDT disabled)
#pragma config PWRTE = OFF		// Power-up Timer Enable (PWRT disabled)
#pragma config MCLRE = ON		// MCLR Pin Function Select (MCLR/VPP pin function is MCLR)
#pragma config CP = OFF			// Flash Program Memory Code Protection (Program memory code protection is disabled)
#pragma config CPD = OFF		// Data Memory Code Protection (Data memory code protection is disabled)
#pragma config BOREN = ON		// Brown-out Reset Enable (Brown-out Reset enabled)
#pragma config CLKOUTEN = OFF	// Clock Out Enable (CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin)
#pragma config IESO = ON		// Internal/External Switchover (Internal/External Switchover mode is enabled)
#pragma config FCMEN = ON		// Fail-Safe Clock Monitor Enable (Fail-Safe Clock Monitor is enabled)

// CONFIG2
#pragma config WRT = OFF		// Flash Memory Self-Write Protection (Write protection off)
#pragma config PLLEN = ON		// PLL Enable (4x PLL enabled)
#pragma config STVREN = ON		// Stack Overflow/Underflow Reset Enable (Stack Overflow or Underflow will cause a Reset)
#pragma config BORV = LO		// Brown-out Reset Voltage Selection (Brown-out Reset Voltage (Vbor), low trip point selected.)
#pragma config LVP = ON			// Low-Voltage Programming Enable (Low-voltage programming enabled)

#include <xc.h>
#include <stdio.h>
#include <stdlib.h>
#include <pic12f1840.h>

typedef unsigned char	BYTE;
typedef unsigned int	WORD;

volatile	BYTE	Count1m;	// 1msec counter
volatile	BYTE	Count10m;	//10msec counter

BYTE	Pwm_frwq;				/* T1Gに入れる周波数をつくる。1msec単位	*/
WORD	T1data;					/* FAN PWM信号1周期時間　clk=32M/8		*/
float	T1data_LPF;				/* 平均化								*/

void	init_timer1(void);
void	init_timer2(void);
void	PIN_MANAGER_Initialize(void);
void	__interrupt() Isr(void);	// LEVEL

/* ****************************************************************** */
void	init_timer1(void)
{
	T1CON = 0x35;	/* 00:Fosc/4,11:1/8,0,0:nonSync,0,1:T1enabl 32MHz/4/8=1MHz　*/
	T1GCON= 0xF8;	/* 1:T1Genable,1:ActivH,1:Togle,1:single,1:T1Ggo 000 		*/
					/* Singleモードは計測後停止，T1Ggo=1でエッジ待ち			*/
	TMR1 = 0; 
	PIR1bits.TMR1GIF = 0;
	PIE1bits.TMR1GIE = 1;	/* T1G割込有効 */ 
	TMR1ON = 1 ;			// 
}
/* ------------------------------------------------------------------ */
void init_timer2(void)
{
	IRCF0 = 0;
	IRCF1 = 1;
	IRCF2 = 1;
	IRCF3 = 1;		// INTOSC = 8MHz
	SPLLEN = 1;		// PLL x4 = 32MHz　Configで定義しているのでなくても動く

	/* Intrrupt TIMER2 */
	T2CON = 0b00111101;		// Post 1/8,Pre_1/4 32M/4/8/4=250kHz
	PR2 = 249;				// Timer2 250k/250=1000Hz
	PIR1bits.TMR2IF = 0;	// Timer2 
	PIE1bits.TMR2IE = 1;	// Timer2 
	TMR2ON = 1 ;			// 
	PEIE   = 1 ;			// 
	GIE	= 1 ;				// 
}
/* ------------------------------------------------------------------ */
void PIN_MANAGER_Initialize(void)
{
	LATA = 0x00;
	TRISA = 0x1B;			// 0:output RA2 RA5  0001 1011
	ANSELA = 0x00;			// 0:digital 1:analog
	WPUA = 0x1B;			// Weak pllup 1:enable
	OPTION_REGbits.nWPUEN = 0;
	APFCON = 0x00;			// ペリフェラルpinを変える時使用。変えないので0　bit3 RA4 is T1G1
	APFCONbits.T1GSEL = 0;	// RA4=T1G
} 
/* ------------------------------------------------------------------ */
void __interrupt() Isr(void)	//One LEVEL　Only
{	// T1G割込でパルス1周期の時間を計測する
	if(PIR1bits.TMR1GIF)		// Timer1G  T1G割込
	{
		PIR1bits.TMR1GIF = 0;	// Clear TMR1GIF
		T1data = (WORD)TMR1;	// Tiner1 DATA 読込
		T1data_LPF = ((T1data_LPF * 0.99)+ (float)T1data*0.01 );	// LPF
			LATA2 ^=1;			// 周波数計測
		TMR1 = 0;				// Timer Counter Clear
		T1GGO = 1;				// T1Ggo=1でエッジ待ち READY状態にする
	}	/* END	PIR1bits.TMR1GIF */

	/*  ------  1msec interrupt ------------  */
	if(PIR1bits.TMR2IF)			// Timer2
	{
		PIR1bits.TMR2IF = 0;	// Reset Interrupt
		/*	FAN ﾊﾟﾙｽ信号模擬	*/
		if(++Pwm_frwq <= 4)
		{
			LATA5 = 0;			// １，２，３，４：4msecLOW出力
		}else if(Pwm_frwq <=8 )
		{
			LATA5 = 1;			// ５，６，７，８，０：5msecHigh出力　9msec周期=111Hz
		}else
		{
			Pwm_frwq = 0;
		}
	
		if(++Count1m >= 10)			// 10msec
		{
			Count1m = 0;
			if(++Count10m >= 10)	// 100msec
			{
				Count10m = 0;
			}
		}
	}	/* END	PIR1bits.TMR2IF */
}
/* ------------------------------------------------------------------ */
void main(void)
{
	PIN_MANAGER_Initialize();
	init_timer2();
	init_timer1();
	Pwm_frwq = 0;

	for(;;)
	{
	}
	return;
}