Andrea Longobardi / Mbed 2 deprecated Serial_Integer_Calculator

This simple program enable LPC11U24 MBED board to act as a simple integer calculator. Just type the operation you want to execute from the serial terminal. Admitted operations: +, -, * /, ^ (only positive exponent). Multiple operations in raw are supported as well as negative integer.

Dependencies:   mbed

Fork of Serial_HelloWorld_Mbed by mbed official

main.cpp@5:8bb67df511a3, 2014-09-22 (annotated)

Committer:
andrelongo85
Date:
Mon Sep 22 06:32:31 2014 +0000
Revision:
5:8bb67df511a3
Parent:
4:235e50314809 
Comments update

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:879aa9d0247b 1 #include "mbed.h"
andrelongo85 1:247161a5c5d6 2
andrelongo85 1:247161a5c5d6 3 #define FALSE 0
andrelongo85 1:247161a5c5d6 4 #define TRUE 1
andrelongo85 1:247161a5c5d6 5
mbed_official 0:879aa9d0247b 6 Serial pc(USBTX, USBRX); // tx, rx
andrelongo85 1:247161a5c5d6 7
andrelongo85 1:247161a5c5d6 8 // function to convert a char buffer to decimal inetger
andrelongo85 1:247161a5c5d6 9 int char_to_int (const char *char_p, const int size)
andrelongo85 1:247161a5c5d6 10 {
andrelongo85 1:247161a5c5d6 11 int tmp = 0;
andrelongo85 1:247161a5c5d6 12 int pot_ten=1;
andrelongo85 1:247161a5c5d6 13 for ( int i= (size -1); i >= 0 ; i-- ) {
andrelongo85 1:247161a5c5d6 14 tmp = int( tmp + ( ( int(char_p[i]) - 48 ) * pot_ten ));
andrelongo85 1:247161a5c5d6 15 pot_ten*=10;
andrelongo85 1:247161a5c5d6 16 }
andrelongo85 1:247161a5c5d6 17 return tmp;
andrelongo85 1:247161a5c5d6 18 }
andrelongo85 1:247161a5c5d6 19
andrelongo85 1:247161a5c5d6 20
andrelongo85 1:247161a5c5d6 21 // check if the input is valid
andrelongo85 1:247161a5c5d6 22 bool si_check_valid(const char & input)
andrelongo85 1:247161a5c5d6 23 {
andrelongo85 3:3bef1c4e42d4 24 if ( ( ( int(input) > 57) || ( int(input) < 48) ) && (input != '+') && (input != '-') && (input != '*') && (input != '/') && (input != '^') && (input != '=') ) {
andrelongo85 1:247161a5c5d6 25 return FALSE;
andrelongo85 1:247161a5c5d6 26 } else {
andrelongo85 1:247161a5c5d6 27 return TRUE;
andrelongo85 1:247161a5c5d6 28 }
andrelongo85 1:247161a5c5d6 29 }
andrelongo85 1:247161a5c5d6 30
andrelongo85 1:247161a5c5d6 31 //check if the input is a number
andrelongo85 1:247161a5c5d6 32 bool si_check_number(const char & input)
andrelongo85 1:247161a5c5d6 33 {
andrelongo85 1:247161a5c5d6 34 if ( (int(input) >= 48) && ( int(input) <= 57) ) {
andrelongo85 1:247161a5c5d6 35 return TRUE;
andrelongo85 1:247161a5c5d6 36 } else {
andrelongo85 1:247161a5c5d6 37 return FALSE;
andrelongo85 1:247161a5c5d6 38 }
andrelongo85 1:247161a5c5d6 39 }
andrelongo85 1:247161a5c5d6 40
andrelongo85 5:8bb67df511a3 41 //global variables
andrelongo85 3:3bef1c4e42d4 42 char c;
andrelongo85 3:3bef1c4e42d4 43 char op = '=';
andrelongo85 3:3bef1c4e42d4 44 char operand [100];
andrelongo85 3:3bef1c4e42d4 45 char buf[10];
andrelongo85 3:3bef1c4e42d4 46 int result =0;
andrelongo85 3:3bef1c4e42d4 47 int result_copy=0;
andrelongo85 3:3bef1c4e42d4 48 int index = 0;
andrelongo85 3:3bef1c4e42d4 49 int ioperand =0;
andrelongo85 3:3bef1c4e42d4 50 bool first = TRUE;
andrelongo85 3:3bef1c4e42d4 51 bool sign_check = TRUE;
andrelongo85 3:3bef1c4e42d4 52 bool neg_operand = FALSE;
andrelongo85 3:3bef1c4e42d4 53 bool error=FALSE;
andrelongo85 2:0baf535ed8f8 54
andrelongo85 5:8bb67df511a3 55 // serial interrupt callback function
andrelongo85 3:3bef1c4e42d4 56 void callback()
andrelongo85 1:247161a5c5d6 57 {
mbed_official 0:879aa9d0247b 58 while(1) {
andrelongo85 2:0baf535ed8f8 59
andrelongo85 1:247161a5c5d6 60 c=pc.getc(); //get serial input
andrelongo85 1:247161a5c5d6 61
andrelongo85 1:247161a5c5d6 62 if (!si_check_valid(c)) { // Invalid Input
andrelongo85 1:247161a5c5d6 63 pc.putc(c);
andrelongo85 1:247161a5c5d6 64 printf ("Invalid Input!\n");
andrelongo85 1:247161a5c5d6 65 } else if (si_check_number(c)) { // Operand has been entered
andrelongo85 1:247161a5c5d6 66 pc.putc(c);
andrelongo85 1:247161a5c5d6 67 operand[index] = c;
andrelongo85 1:247161a5c5d6 68 index++;
andrelongo85 2:0baf535ed8f8 69 sign_check = FALSE; //sign check disactivated
andrelongo85 1:247161a5c5d6 70 } else { //Operator has been entered
andrelongo85 2:0baf535ed8f8 71
andrelongo85 2:0baf535ed8f8 72 if(!sign_check) {
andrelongo85 2:0baf535ed8f8 73 pc.putc('\n');
andrelongo85 2:0baf535ed8f8 74 pc.putc(c);
andrelongo85 2:0baf535ed8f8 75 pc.putc('\n');
andrelongo85 1:247161a5c5d6 76
andrelongo85 2:0baf535ed8f8 77 // sign adjustment
andrelongo85 2:0baf535ed8f8 78 if(neg_operand) {
andrelongo85 2:0baf535ed8f8 79 ioperand = -(char_to_int(operand,index));
andrelongo85 2:0baf535ed8f8 80 } else {
andrelongo85 2:0baf535ed8f8 81 ioperand = char_to_int(operand,index);
andrelongo85 2:0baf535ed8f8 82 }
andrelongo85 3:3bef1c4e42d4 83
andrelongo85 3:3bef1c4e42d4 84
andrelongo85 5:8bb67df511a3 85 if (first) { //First operator
andrelongo85 2:0baf535ed8f8 86 result = ioperand;
andrelongo85 2:0baf535ed8f8 87 first = FALSE;
andrelongo85 5:8bb67df511a3 88 } else { //Do calculation
andrelongo85 1:247161a5c5d6 89
andrelongo85 2:0baf535ed8f8 90 if(op == '+') {
andrelongo85 2:0baf535ed8f8 91 result = int (result + ioperand);
andrelongo85 2:0baf535ed8f8 92 } else if (op == '-') {
andrelongo85 2:0baf535ed8f8 93 result = int (result - ioperand);
andrelongo85 2:0baf535ed8f8 94 } else if (op == '/') {
andrelongo85 2:0baf535ed8f8 95 result = int (result / ioperand);
andrelongo85 2:0baf535ed8f8 96 } else if (op == '*') {
andrelongo85 2:0baf535ed8f8 97 result = int (result * ioperand);
andrelongo85 3:3bef1c4e42d4 98 } else if (op == '^') {
andrelongo85 3:3bef1c4e42d4 99 if(!neg_operand) {
andrelongo85 3:3bef1c4e42d4 100 result_copy = result;
andrelongo85 3:3bef1c4e42d4 101 for(int i = (abs(ioperand) -1); i>0; i--) {
andrelongo85 3:3bef1c4e42d4 102 result *=result_copy;
andrelongo85 3:3bef1c4e42d4 103 }
andrelongo85 3:3bef1c4e42d4 104 } else {
andrelongo85 3:3bef1c4e42d4 105 pc.printf("ERROR:Negative exponent");
andrelongo85 3:3bef1c4e42d4 106 error = TRUE;
andrelongo85 3:3bef1c4e42d4 107 }
andrelongo85 2:0baf535ed8f8 108 }
andrelongo85 2:0baf535ed8f8 109
andrelongo85 2:0baf535ed8f8 110 if (c == '=') { // Operator = has been entered--> Print result and reset calculator
andrelongo85 2:0baf535ed8f8 111 for (int j =9; j>=0; j--) {
andrelongo85 2:0baf535ed8f8 112 buf[j]='\0';
andrelongo85 2:0baf535ed8f8 113 }
andrelongo85 3:3bef1c4e42d4 114 if(!error) {
andrelongo85 3:3bef1c4e42d4 115 sprintf(buf, "%d", result);
andrelongo85 3:3bef1c4e42d4 116 pc.printf("%s", buf);
andrelongo85 3:3bef1c4e42d4 117 }
andrelongo85 2:0baf535ed8f8 118 pc.printf("\n\n");
andrelongo85 4:235e50314809 119 pc.printf("Please enter a new operation:\n");
andrelongo85 2:0baf535ed8f8 120 first = TRUE;
andrelongo85 3:3bef1c4e42d4 121 error = FALSE;
andrelongo85 2:0baf535ed8f8 122 }
andrelongo85 1:247161a5c5d6 123 }
andrelongo85 5:8bb67df511a3 124 op = c; // assign the operator
andrelongo85 2:0baf535ed8f8 125 index=0; // reset the operand
andrelongo85 2:0baf535ed8f8 126 sign_check = TRUE; // sign check activated
andrelongo85 3:3bef1c4e42d4 127 neg_operand=FALSE;
andrelongo85 2:0baf535ed8f8 128 } else {
andrelongo85 2:0baf535ed8f8 129 pc.putc(c);
andrelongo85 2:0baf535ed8f8 130 if (c=='-') {
andrelongo85 2:0baf535ed8f8 131 neg_operand=TRUE;
andrelongo85 2:0baf535ed8f8 132 sign_check = FALSE;
andrelongo85 2:0baf535ed8f8 133 } else if (c=='+') {
andrelongo85 2:0baf535ed8f8 134 neg_operand=FALSE;
andrelongo85 2:0baf535ed8f8 135 sign_check = FALSE;
andrelongo85 3:3bef1c4e42d4 136 } else {
andrelongo85 3:3bef1c4e42d4 137 pc.printf("ERROR:Two consecutive Operators entered");
andrelongo85 3:3bef1c4e42d4 138 error = TRUE;
andrelongo85 1:247161a5c5d6 139 }
andrelongo85 1:247161a5c5d6 140 }
andrelongo85 1:247161a5c5d6 141 }
mbed_official 0:879aa9d0247b 142 }
andrelongo85 1:247161a5c5d6 143 }
andrelongo85 1:247161a5c5d6 144
andrelongo85 5:8bb67df511a3 145 // MAIN
andrelongo85 3:3bef1c4e42d4 146 int main()
andrelongo85 3:3bef1c4e42d4 147 {
andrelongo85 3:3bef1c4e42d4 148 pc.attach(&callback,Serial::RxIrq);
andrelongo85 3:3bef1c4e42d4 149
andrelongo85 3:3bef1c4e42d4 150 pc.printf("LPC Integer Calculator!\n");
andrelongo85 4:235e50314809 151 pc.printf("Please enter a new operation:\n");
andrelongo85 3:3bef1c4e42d4 152 while (1) {}
andrelongo85 3:3bef1c4e42d4 153 }