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/* LAB 2 Part A */  /* This program displays the number of times each of the Timer A interrupts have occured on the computer monitor */  /* Definitions */  #define MAX_COUNT 100 // Maximum Count Value  #define TMA5_MASK 0x20 // Mask for Timer A5 in TACSR  #define TMA6_MASK 0x40 // Mask for Timer A6 in TACSR  #define TMA7_MASK 0x80 // MAsk for Timer A7 in TACSR  /* Variable declarations */  char count_TMRA5; // This variable will count the number of times Timer A5 has triggered an interrupted  char count_TMRA6; // This variable will count the number of times Timer A6 has triggered an interrupted  char count_TMRA7; // This variable will count the number of times Timer A7 has triggered an interrupted  int display_count[3]; // This variable will hold the count values divided by 100  char i; // iterator  /* function prototype */  void Tmr_A_isr(); // Timer A interrupt service routine  void DispStr(int x, int y, char *s); // display strings on computer monitor  main()  {  /* Initializations */  auto char display[128];  auto char key;  brdInit();  count_TMRA5 = 0; // initialize counters to zero  count_TMRA6 = 0; // initialize counters to zero  count_TMRA7 = 0; // initialize counters to zero  for (i = 0; i < 3; i++) // initialize display counters to zero  display_count[i] = 0;  /*************** FILL IN CODE TO REPLACE '------'. CODE SHOULD BE CONSISTENT WITH COMMENTS. REFER TO FIGURE 5. IN LAB MANUAL. *******************/  /* set up timer A interrupt */  SetVectIntern(0x0A, Tmr_A_isr); // set up timer A interrupt vector  WrPortI(TAT7R, &TAT7RShadow, 0x3F); // set TMRA7 to count down from 63  ----------------------------------- // set TMRA6 to count down from 127  ----------------------------------- // set TMRA5 to count down from 255  ----------------------------------- // set TMRA1 to count down from 255  WrPortI(TACR, &TACRShadow, ----); // Clock TMRA5,TMRA6,TMRA7 by TMRA1. Clock TMRA4 by PCLK/2. Set Timer A to trigger priority 1 interrupts  WrPortI(TACSR, &TACSRShadow,----); // Enable interrupts for TMRA5,TMRA6,TMRA7 only. Enable main clock for Timer A  /************************************************************************************************************************************************/  DispStr(5, 10, "<-PRESS 'Q' TO QUIT->");  /* This is the background process. It repeatedly updates the computer monitor with the values in the display_count array */  while(1) {  for(i = 0; i < 3; i++) {  display[0] = '\0';  sprintf(display, "Number of TMRA%d interrupts: %d\ (x100)",i+5, display_count[i]);  DispStr(5, i+1, display);  }  if (kbhit()) { // See if key has been pressed  key = getchar();  if (key == 0x71 || key == 0x51) // Yes, see if it's the q or Q key  exit(0);  }  }  }  /* Timer A interrupt service routine */  nodebug root interrupt void Tmr_A_isr()  {  char TMRA_status; // This will hold the interrupt flags  TMRA_status = RdPortI(TACSR); // Read interrupt flags and store to TMRA_status  /* There are three possible events leading to this service routine being called. Write code to determine which of the three  timers has triggered the interrupt. Note it is possible for more than one timer to expire at the same time, thus \begin{lstlisting}[frame=single] % Start  your code must service  all triggers. By testing the interrupt flags in TMRA_status, you can determine which counters have expired. Use  three count variables count_TMRAX (X is 5, 6 and 7) to count the number of interrupts. For each Timer AX interrupt you must increment the corresponding count variable.  i.e., if Timer A5 has expired then increment count_TMRA5. */  /*** During your lab session, you will replace the following code to perform as specified above ***/  count_TMRA5++;  count_TMRA6++;  count_TMRA7++;  /**************************************************************************************************/  /* The following code increment the display array for every 100 interrupts code-block  for a respective timer, and resets the count variable */  if (count_TMRA5 == MAX_COUNT){ // if Timer A5 has interrupted the CPU 100 times  display_count[0]++; // increment the display counter  count_TMRA5 = 0; // clear the Timer A5 counter  }  if (count_TMRA6 == MAX_COUNT){ // if Timer A6 has interrupted the CPU 100 times  display_count[1]++; // increment the display counter  count_TMRA6 = 0; // clear the Timer A6 counter  }  if (count_TMRA7 == MAX_COUNT){ // if Timer A6 has interrupted the CPU 100 times  display_count[2]++; // increment the display counter  count_TMRA7 = 0; // clear the Timer A6 counter  }  }  /* set the STDIO cursor location and display a string */  void DispStr(int x, int y, char *s) i:=maxint to 0 do  begin  { x += 0x20;  y += 0x20;  printf ("\x1B=%c%c%s", x, y, s);  } do nothing }  end;  Write('Case insensitive ');  Write('Pascal keywords.');  \end{lstlisting}  \textit{Oh, an empty article!}