RS232-MUX

/* Microchip Technology Inc. and its subsidiaries.  You may use this software 

 * and any derivatives exclusively with Microchip products. 

 * 

 * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS".  NO WARRANTIES, WHETHER 

 * EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, INCLUDING ANY IMPLIED 

 * WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A 

 * PARTICULAR PURPOSE, OR ITS INTERACTION WITH MICROCHIP PRODUCTS, COMBINATION 

 * WITH ANY OTHER PRODUCTS, OR USE IN ANY APPLICATION. 

 *

 * IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, 

 * INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND 

 * WHATSOEVER RELATED TO THE SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS 

 * BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE 

 * FULLEST EXTENT ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS 

 * IN ANY WAY RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF 

 * ANY, THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.

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 * MICROCHIP PROVIDES THIS SOFTWARE CONDITIONALLY UPON YOUR ACCEPTANCE OF THESE 

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 */

/* 

 * File: hardware_timer.h

 * Author: Enzo Niro 

 * Comments: Library made for RS232 MUX board

 * Revision history: 1.0

 */

// This is a guard condition so that contents of this file are not included

// more than once.  

#ifndef RS232_HARDWARETIMER_H

#define        RS232_HARDWARETIMER_H

#include <xc.h> // include processor files - each processor file is guarded.  

#define CLK_DIV1            0x00

#define CLK_DIV2            0x01

#define CLK_DIV4            0x02

#define CLK_DIV8            0x03

#define CLK_DIV16           0x04

#define CLK_DIV64           0x05

#define CLK_DIV256          0x06

#define CLK_DIV1024         0x07

#define SEL_CLK             CLK_DIV1

#ifdef        __cplusplus

extern "C" {

#endif /* __cplusplus */

    uint32_t _timerA0Cnt = 0;

    //Timer interrupt init

    void timerInterruptInit(uint16_t maxCounts)

    {

        //Init Timer interrupt type A

        //To avoid fast interruption that slow main program, divide clock by 2 !

        //We use here timer interrupt 0 in normal mode

        //At first, define the timer period

        TCA0.SINGLE.PERH = maxCounts >> 8;

        TCA0.SINGLE.PERL = maxCounts & 0xFF;

        TCA0.SINGLE.CTRLA = (SEL_CLK << 1) | 1; //Enable and CLK_DIV2

        TCA0.SINGLE.CTRLB = 0x00; //Set Normal operation for timer, no autolock, no waveform output

        TCA0.SINGLE.EVCTRL = 0x00; //No specific action and counter event input

        TCA0.SINGLE.INTCTRL = 0x01; //Set interrupt on timer overflow

    }

    //Get number of subcounts made

    uint32_t getTimerCounts(void)

    {

        return _timerA0Cnt;

    }

    //Timer interrupt callback

    ISR(TCA0_OVF_vect)

    {

        _timerA0Cnt++;

        TCA0.SINGLE.INTFLAGS = 1; //Must clear the flag by writing 1 on this bit (datasheet p.232)

    }

#ifdef        __cplusplus

}

#endif /* __cplusplus */

#endif        /* XC_HEADER_TEMPLATE_H */