/*
 * timerA_input_capture_example.c
 *
 *  Created on: 10/9/18
 *      Author: johnsontimoj
 */
//////////////////////////////////////
//
//  Timer A setup to capture on pin 35
//  Captures data in an array and then prints
//  the array out - this is to prevent the printing
//  from impacting the access to the register
//
////////////////////////////////////
//
//  Pin 35 is P6.7
//  P6.7 is TimerA_2, Input 4
//
//  Use SMCLK for timer clock
//      SMCLK defaults to HSMCLK which defaults to HFXTCLK
//      all with a default of divide by 1
//          --> SMCLK = 3MHz
//      set divide on the Timer
//      to get 4us resolution need 3MHz/12
//          /12 --> /4/3
//
///////////////////////////////////
#include "msp.h"
#include <stdio.h>

void setup_timer(void);

int main(){

    int data[100];

    setup_timer();

    int i;
    for(i=0; i<100; i++){
      data[i] = TIMER_A2->CCR[4];
    }
    for(i=0; i<100; i++){
      printf("%i\n", data[i]);
    }

    return 0;
} // end main

void setup_timer(void){
    //
    // setup pins
    //
    // P6.7 in PSEL=01 mode and set as input
    P6->SEL0 |= 0x80;
    P6->SEL1 &= ~0x80;
    P6->DIR &= ~0x80;

    //
    // TIMER_A2
    // CTL
    //        SMCLK   /4   cont    noclr  no int
    // xxxx xx 10     10    10  x   0       0     x
    TIMER_A2->CTL = 0x02A0;

    //
    // EX0
    //  xxxx xxxx xxxx  x  /3
    //  0000 0000 0000  0 010
    TIMER_A2->EX0 = 0x0002;

    //
    // CCTL[4]
    // both  CCIxA  sync  x  x  cap  xxx  no int  x  x  x  x
    //  11    00      1   0  0   1   000    0     0  0  0  0
    TIMER_A2->CCTL[4] = 0xC900;

    return;
 } // end setup_timer