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masterFunc.c
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/*
* CW spec: https://www.macs.hw.ac.uk/~hwloidl/Courses/F28HS/F28HS_CW2_2022.pdf
* This repo: https://gitlab-student.macs.hw.ac.uk/f28hs-2021-22/f28hs-2021-22-staff/f28hs-2021-22-cwk2-sys
* Compile:
gcc -c -o lcdBinary.o lcdBinary.c
gcc -c -o master-mind.o master-mind.c
gcc -o master-mind master-mind.o lcdBinary.o
* Run:
sudo ./master-mind
OR use the Makefile to build
> make all
and run
> make run
and test
> make test
***********************************************************************
* The Low-level interface to LED, button, and LCD is based on:
* wiringPi libraries by
* Copyright (c) 2012-2013 Gordon Henderson.
***********************************************************************
* See:
* https://projects.drogon.net/raspberry-pi/wiringpi/
*
* wiringPi is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* wiringPi is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
***********************************************************************
*/
/* ======================================================= */
/* SECTION: includes */
/* ------------------------------------------------------- */
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdarg.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <sys/time.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
/* --------------------------------------------------------------------------- */
/* Config settings */
/* you can use CPP flags to e.g. print extra debugging messages */
/* or switch between different versions of the code e.g. digitalWrite() in Assembler */
#define DEBUG
#undef ASM_CODE
// =======================================================
// Tunables
// PINs (based on BCM numbering)
// For wiring see CW spec: https://www.macs.hw.ac.uk/~hwloidl/Courses/F28HS/F28HS_CW2_2022.pdf
// GPIO pin for green LED
#define GREEN 13
// GPIO pin for red LED
#define RED 5
// GPIO pin for button
#define BUTTON 19
// =======================================================
// delay for loop iterations (mainly), in ms
// in mili-seconds: 0.2s
#define DELAY 200
// in micro-seconds: 3s
#define TIMEOUT 3000000
// =======================================================
// APP constants ---------------------------------
// number of colours and length of the sequence
#define COLS 3
#define SEQL 3
// =======================================================
// generic constants
#ifndef TRUE
#define TRUE (1 == 1)
#define FALSE (1 == 2)
#endif
#define PAGE_SIZE (4 * 1024)
#define BLOCK_SIZE (4 * 1024)
#define INPUT 0
#define OUTPUT 1
#define LOW 0
#define HIGH 1
// =======================================================
// Wiring (see inlined initialisation routine)
#define STRB_PIN 24
#define RS_PIN 25
#define DATA0_PIN 23
#define DATA1_PIN 10
#define DATA2_PIN 27
#define DATA3_PIN 22
/* ======================================================= */
/* SECTION: constants and prototypes */
/* ------------------------------------------------------- */
// =======================================================
// char data for the CGRAM, i.e. defining new characters for the display
static unsigned char newChar[8] =
{
0b11111,
0b10001,
0b10001,
0b10101,
0b11111,
0b10001,
0b10001,
0b11111,
};
static unsigned char hawoNewChar[8] =
{
0b11111,
0b10001,
0b10001,
0b10001,
0b10001,
0b10001,
0b10001,
0b11111,
};
/* Constants */
static const int colors = COLS;
static const int seqlen = SEQL;
static char *color_names[] = {"red", "green", "blue"};
static int *theSeq = NULL;
static int *seq1, *seq2, *cpy1, *cpy2;
/* --------------------------------------------------------------------------- */
// data structure holding data on the representation of the LCD
struct lcdDataStruct
{
int bits, rows, cols;
int rsPin, strbPin;
int dataPins[8];
int cx, cy;
};
static int lcdControl;
/* ***************************************************************************** */
/* INLINED fcts from wiringPi/devLib/lcd.c: */
// HD44780U Commands (see Fig 11, p28 of the Hitachi HD44780U datasheet)
#define LCD_CLEAR 0x01
#define LCD_HOME 0x02
#define LCD_ENTRY 0x04
#define LCD_CTRL 0x08
#define LCD_CDSHIFT 0x10
#define LCD_FUNC 0x20
#define LCD_CGRAM 0x40
#define LCD_DGRAM 0x80
// Bits in the entry register
#define LCD_ENTRY_SH 0x01
#define LCD_ENTRY_ID 0x02
// Bits in the control register
#define LCD_BLINK_CTRL 0x01
#define LCD_CURSOR_CTRL 0x02
#define LCD_DISPLAY_CTRL 0x04
// Bits in the function register
#define LCD_FUNC_F 0x04
#define LCD_FUNC_N 0x08
#define LCD_FUNC_DL 0x10
#define LCD_CDSHIFT_RL 0x04
// Mask for the bottom 64 pins which belong to the Raspberry Pi
// The others are available for the other devices
#define PI_GPIO_MASK (0xFFFFFFC0)
static unsigned int gpiobase;
static uint32_t *gpio;
static int timed_out = 0;
/* ======================================================= */
/* SECTION: Aux function */
/* ------------------------------------------------------- */
/* misc aux functions */
int failure(int fatal, const char *message, ...)
{
va_list argp;
char buffer[1024];
if (!fatal)
return -1;
va_start(argp, message);
vsnprintf(buffer, 1023, message, argp);
va_end(argp);
fprintf(stderr, "%s", buffer);
exit(EXIT_FAILURE);
return 0;
}
/*
* waitForEnter:
*********************************************************************************
*/
void waitForEnter(void)
{
printf("Press ENTER to continue: ");
(void)fgetc(stdin);
}
/* ======================================================= */
/* SECTION: TIMER code */
/* ------------------------------------------------------- */
/* TIMER code */
/* timestamps needed to implement a time-out mechanism */
static uint64_t startT, stopT;
/* you may need this function in timer_handler() below */
/* use the libc fct gettimeofday() to implement it */
uint64_t timeInMicroseconds()
{
struct timeval tv;
uint64_t now;
gettimeofday(&tv, NULL);
now = (uint64_t)tv.tv_sec * (uint64_t)1000000 + (uint64_t)tv.tv_usec; // in us
// now = (uint64_t)tv.tv_sec * (uint64_t)1000 + (uint64_t)(tv.tv_usec / 1000) ; // in ms
return (uint64_t)now;
}
/* this should be the callback, triggered via an interval timer, */
/* that is set-up through a call to sigaction() in the main fct. */
void timer_handler(int signum)
{
static int count = 0;
stopT = timeInMicroseconds();
count++;
fprintf(stderr, "timer expired %d times; (measured interval %f sec)\n", count, (stopT - startT) / 1000000.0);
startT = timeInMicroseconds();
}
/* initialise time-stamps, setup an interval timer, and install the timer_handler callback */
void initITimer(uint64_t timeout)
{
/* *** COMPLETE the code here *** */
}
/* From wiringPi code; comment by Gordon Henderson
* delayMicroseconds:
* This is somewhat intersting. It seems that on the Pi, a single call
* to nanosleep takes some 80 to 130 microseconds anyway, so while
* obeying the standards (may take longer), it's not always what we
* want!
*
* So what I'll do now is if the delay is less than 100uS we'll do it
* in a hard loop, watching a built-in counter on the ARM chip. This is
* somewhat sub-optimal in that it uses 100% CPU, something not an issue
* in a microcontroller, but under a multi-tasking, multi-user OS, it's
* wastefull, however we've no real choice )-:
*
* Plan B: It seems all might not be well with that plan, so changing it
* to use gettimeofday () and poll on that instead...
*********************************************************************************
*/
void delayMicroseconds(unsigned int howLong)
{
struct timespec sleeper;
unsigned int uSecs = howLong % 1000000;
unsigned int wSecs = howLong / 1000000;
/**/ if (howLong == 0)
return;
#if 0
else if (howLong < 100)
delayMicrosecondsHard (howLong) ;
#endif
else
{
sleeper.tv_sec = wSecs;
sleeper.tv_nsec = (long)(uSecs * 1000L);
nanosleep(&sleeper, NULL);
}
}
/*
* delay:
* Wait for some number of milliseconds
*********************************************************************************
*/
void delay(unsigned int howLong)
{
struct timespec sleeper, dummy;
sleeper.tv_sec = (time_t)(howLong / 1000);
sleeper.tv_nsec = (long)(howLong % 1000) * 1000000;
nanosleep(&sleeper, &dummy);
}
/* ======================================================= */
/* SECTION: hardware interface (LED, button, LCD display) */
/* ------------------------------------------------------- */
/* low-level interface to the hardware */
/* sends a @value (LOW or HIGH) on pin number @pin; @gpio@ is the mmaped GPIO base address */
void digitalWrite(uint32_t *gpio, int pin, int value)
{
int off, res;
off = (value == LOW) ? 10 : 7;
asm volatile(
"\tLDR R1, %[gpio]\n"
"\tADD R0, R1, %[off]\n"
"\tMOV R2, #1\n"
"\tMOV R1, %[pin]\n"
"\tAND R1, #31\n"
"\tLSL R2, R1\n"
"\tSTR R2, [R0, #0]\n"
"\tMOV %[result], R2\n"
: [result] "=r"(res)
: [pin] "r"(pin), [gpio] "m"(gpio), [off] "r"(off * 4)
: "r0", "r1", "r2", "cc");
}
/* sets the @mode of a GPIO @pin to INPUT or OUTPUT; @gpio is the mmaped GPIO base address */
void pinMode(uint32_t *gpio, int pin, int mode)
{
int fSel = pin / 10;
int shift = (pin % 10) * 3;
int res;
// output
if (mode == OUTPUT)
{
asm(/* inline assembler version of setting to ouput" */
"\tLDR R1, %[gpio]\n"
"\tADD R0, R1, %[fSel]\n"
"\tLDR R1, [R0, #0]\n"
"\tMOV R2, #0b111\n"
"\tLSL R2, %[shift]\n"
"\tBIC R1, R1, R2\n"
"\tMOV R2, #1\n"
"\tLSL R2, %[shift]\n"
"\tORR R1, R2\n"
"\tSTR R1, [R0, #0]\n"
"\tMOV %[result], R1\n"
: [result] "=r"(res)
: [pin] "r"(pin), [gpio] "m"(gpio), [fSel] "r"(fSel * 4), [shift] "r"(shift)
: "r0", "r1", "r2", "cc");
}
// input
else if (mode == INPUT)
{
asm(/* inline assembler version of setting to input" */
"\tLDR R1, %[gpio]\n"
"\tADD R0, R1, %[fSel]\n"
"\tLDR R1, [R0, #0]\n"
"\tMOV R2, #0b111\n"
"\tLSL R2, %[shift]\n"
"\tBIC R1, R1, R2\n"
"\tSTR R1, [R0, #0]\n"
"\tMOV %[result], R1\n"
: [result] "=r"(res)
: [pin] "r"(pin), [gpio] "m"(gpio), [fSel] "r"(fSel * 4), [shift] "r"(shift)
: "r0", "r1", "r2", "cc");
}
else
{
fprintf(stderr, "Invalid mode");
}
}
/* sends a @value (LOW or HIGH) on pin number @pin; @gpio is the mmaped GPIO base address */
void writeLED(uint32_t *gpio, int led, int value)
{
int off, res;
if (value == LOW)
{
off = 10;
asm volatile(
/*inline assembler version of clearing LED*/
"\tLDR R1, %[gpio]\n"
"\tADD R0, R1, %[off]\n"
"\tMOV R2, #1\n"
"\tMOV R1, %[pin]\n"
"\tAND R1, #31\n"
"\tLSL R2, R1\n"
"\tSTR R2, [R0,#0]\n"
"\tMOV %[result], R2\n"
: [result] "=r"(res)
: [pin] "r"(led), [gpio] "m"(gpio), [off] "r"(off * 4)
: "r0", "r1", "r2", "cc");
}
else
{
off = 7;
asm volatile(
/*inline assembler version of setting LED*/
"\tLDR R1, %[gpio]\n"
"\tADD R0, R1, %[off]\n"
"\tMOV R2, #1\n"
"\tMOV R1, %[pin]\n"
"\tAND R1, #31\n"
"\tLSL R2, R1\n"
"\tSTR R2, [R0,#0]\n"
"\tMOV %[result], R2\n"
: [result] "=r"(res)
: [pin] "r"(led), [gpio] "m"(gpio), [off] "r"(off * 4)
: "r0", "r1", "r2", "cc");
}
}
/* reads a @value (LOW or HIGH) from pin number @pin (a button device); @gpio is the mmaped GPIO base address */
int readButton(uint32_t *gpio, int button)
{
int state = 0;
asm volatile(
"MOV R1, %[gpio]\n"
"LDR R2, [R1, #0x34]\n"
"MOV R3, %[pin]\n"
"MOV R4, #1\n"
"LSL R4, R3\n"
"AND %[state], R2, R4\n"
: [state] "=r"(state)
: [pin] "r"(button), [gpio] "r"(gpio)
: "r0", "r1", "r2", "r3", "r4", "cc");
return state > 0;
}
/* waits for a button input on pin number @button; @gpio@ is the mmaped GPIO base address */
/* uses readButton() */
void waitForButton(uint32_t *gpio, int button)
{
for (int j = 0; j < 13; j++)
{
if (readButton(gpio, button))
break;
delay(DELAY);
}
}
/* ======================================================= */
/* SECTION: aux functions for game logic */
/* ------------------------------------------------------- */
/* --------------------------------------------------------------------------- */
/* interface on top of the low-level pin I/O code */
/* blink the led on pin @led, @c times */
void blinkN(uint32_t *gpio, int led, int c)
{
for (int i = 0; i < c; i++)
{
writeLED(gpio, led, HIGH);
delay(700);
writeLED(gpio, led, LOW);
delay(700);
}
}
/* ======================================================= */
/* SECTION: LCD functions */
/* ------------------------------------------------------- */
/* medium-level interface functions (all in C) */
/* from wiringPi:
* strobe:
* Toggle the strobe (Really the "E") pin to the device.
* According to the docs, data is latched on the falling edge.
*********************************************************************************
*/
void strobe(const struct lcdDataStruct *lcd)
{
// timing changes for new version of delayMicroseconds ()
digitalWrite(gpio, lcd->strbPin, 1);
delayMicroseconds(50);
digitalWrite(gpio, lcd->strbPin, 0);
delayMicroseconds(50);
}
/*
* sentDataCmd:
* Send some data or command byte to the display.
*********************************************************************************
*/
void sendDataCmd(const struct lcdDataStruct *lcd, unsigned char data)
{
register unsigned char myData = data;
unsigned char i, d4;
if (lcd->bits == 4)
{
d4 = (myData >> 4) & 0x0F;
for (i = 0; i < 4; ++i)
{
digitalWrite(gpio, lcd->dataPins[i], (d4 & 1));
d4 >>= 1;
}
strobe(lcd);
d4 = myData & 0x0F;
for (i = 0; i < 4; ++i)
{
digitalWrite(gpio, lcd->dataPins[i], (d4 & 1));
d4 >>= 1;
}
}
else
{
for (i = 0; i < 8; ++i)
{
digitalWrite(gpio, lcd->dataPins[i], (myData & 1));
myData >>= 1;
}
}
strobe(lcd);
}
/*
* lcdPutCommand:
* Send a command byte to the display
*********************************************************************************
*/
void lcdPutCommand(const struct lcdDataStruct *lcd, unsigned char command)
{
// #ifdef DEBUG
// fprintf(stderr, "lcdPutCommand: digitalWrite(%d,%d) and sendDataCmd(%d,%d)\n", lcd->rsPin, 0, lcd, command);
// #endif
digitalWrite(gpio, lcd->rsPin, 0);
sendDataCmd(lcd, command);
delay(2);
}
void lcdPut4Command(const struct lcdDataStruct *lcd, unsigned char command)
{
register unsigned char myCommand = command;
register unsigned char i;
digitalWrite(gpio, lcd->rsPin, 0);
for (i = 0; i < 4; ++i)
{
digitalWrite(gpio, lcd->dataPins[i], (myCommand & 1));
myCommand >>= 1;
}
strobe(lcd);
}
/*
* lcdHome: lcdClear:
* Home the cursor or clear the screen.
*********************************************************************************
*/
void lcdHome(struct lcdDataStruct *lcd)
{
#ifdef DEBUG
fprintf(stderr, "lcdHome: lcdPutCommand(%d,%d)\n", lcd, LCD_HOME);
#endif
lcdPutCommand(lcd, LCD_HOME);
lcd->cx = lcd->cy = 0;
delay(5);
}
void lcdClear(struct lcdDataStruct *lcd)
{
// #ifdef DEBUG
// fprintf(stderr, "lcdClear: lcdPutCommand(%d,%d) and lcdPutCommand(%d,%d)\n", lcd, LCD_CLEAR, lcd, LCD_HOME);
// #endif
lcdPutCommand(lcd, LCD_CLEAR);
lcdPutCommand(lcd, LCD_HOME);
lcd->cx = lcd->cy = 0;
delay(5);
}
/*
* lcdPosition:
* Updates the position of the cursor on the display.
* Ignores invalid locations.
*********************************************************************************
*/
void lcdPosition(struct lcdDataStruct *lcd, int x, int y)
{
if ((x > lcd->cols) || (x < 0))
return;
if ((y > lcd->rows) || (y < 0))
return;
lcdPutCommand(lcd, x + (LCD_DGRAM | (y > 0 ? 0x40 : 0x00) /* rowOff [y] */));
lcd->cx = x;
lcd->cy = y;
}
/*
* lcdDisplay: lcdCursor: lcdCursorBlink:
* Turn the display, cursor, cursor blinking on/off
*********************************************************************************
*/
void lcdDisplay(struct lcdDataStruct *lcd, int state)
{
if (state)
lcdControl |= LCD_DISPLAY_CTRL;
else
lcdControl &= ~LCD_DISPLAY_CTRL;
lcdPutCommand(lcd, LCD_CTRL | lcdControl);
}
void lcdCursor(struct lcdDataStruct *lcd, int state)
{
if (state)
lcdControl |= LCD_CURSOR_CTRL;
else
lcdControl &= ~LCD_CURSOR_CTRL;
lcdPutCommand(lcd, LCD_CTRL | lcdControl);
}
void lcdCursorBlink(struct lcdDataStruct *lcd, int state)
{
if (state)
lcdControl |= LCD_BLINK_CTRL;
else
lcdControl &= ~LCD_BLINK_CTRL;
lcdPutCommand(lcd, LCD_CTRL | lcdControl);
}
/*
* lcdPutchar:
* Send a data byte to be displayed on the display. We implement a very
* simple terminal here - with line wrapping, but no scrolling. Yet.
*********************************************************************************
*/
void lcdPutchar(struct lcdDataStruct *lcd, unsigned char data)
{
digitalWrite(gpio, lcd->rsPin, 1);
sendDataCmd(lcd, data);
if (++lcd->cx == lcd->cols)
{
lcd->cx = 0;
if (++lcd->cy == lcd->rows)
lcd->cy = 0;
// inline computation of address
lcdPutCommand(lcd, lcd->cx + (LCD_DGRAM | (lcd->cy > 0 ? 0x40 : 0x00) /* rowOff [lcd->cy] */));
}
}
/*
* lcdPuts:
* Send a string to be displayed on the display
*********************************************************************************
*/
void lcdPuts(struct lcdDataStruct *lcd, const char *string)
{
while (*string)
lcdPutchar(lcd, *string++);
}
/* ======================================================= */
/* SECTION: helper functions */
/* ------------------------------------------------------- */
/* Helper functions for help with game logic */
/* Function to concat two individual digits
Reference: https://stackoverflow.com/questions/12700497/how-to-concatenate-two-integers-in-c*/
int concat(int x, int y)
{
int temp = y;
do
{
x *= 10;
y /= 10;
} while (y != 0);
return x + temp;
}
/* Function to reverse arr[] from start to end*/
void reverse(int arr[], int start, int end)
{
int temp;
while (start < end)
{
temp = arr[start];
arr[start] = arr[end];
arr[end] = temp;
start++;
end--;
}
}
/* Helper function to show user guess on terminal */
void showGuess(int colorNum, struct lcdDataStruct *lcd)
{
switch (colorNum)
{
case 1:
lcdPuts(lcd, " R");
fprintf(stderr, " R");
break;
case 2:
lcdPuts(lcd, " G");
fprintf(stderr, " G");
break;
case 3:
lcdPuts(lcd, " B");
fprintf(stderr, " B");
break;
}
}
void showMatchesLCD(int code, struct lcdDataStruct *lcd)
{
// Variable as index value
int index = 0;
// Temporary array to store encoded values
int *temp = (int *)malloc(2 * sizeof(int));
char *text = (char *)malloc(3 * sizeof(char)); // rifrof
// While loop to split code digits into array
// If passed argument 'code' is not 0, and the current index is less than the length of secret sequence
while (code != 0 && index < seqlen)
{
temp[index] = code % 10;
++index;
code /= 10;
}
// Store digits in respective int values
int approx = temp[0];
int correct = temp[1];
// Print out correct and approximate values to terminal
// printf("Exact: %d Approximate: %d\n\n", correct, approx);
printf("%d exact\n", correct);
printf("%d approximate\n", approx);
// Free temp array
free(temp);
lcdPosition(lcd, 0, 1);
lcdPuts(lcd, "Exact: ");
sprintf(text, "%d", correct);
lcdPosition(lcd, 6, 1);
lcdPuts(lcd, text);
blinkN(gpio, GREEN, correct);
blinkN(gpio, RED, 1);
lcdPosition(lcd, 8, 1);
lcdPuts(lcd, "Approx: ");
sprintf(text, "%d", approx);
lcdPosition(lcd, 15, 1);
lcdPuts(lcd, text);
blinkN(gpio, GREEN, approx);
}
/* ======================================================= */
/* SECTION: game logic */
/* ------------------------------------------------------- */
/* AUX fcts of the game logic */
/* initialise the secret sequence; by default it should be a random sequence */
void initSeq()
{
// Allocating memory for array
theSeq = (int *)malloc(seqlen * sizeof(int));
// Exit program if array is null
if (theSeq == NULL)
{
printf("Array is null i.e., memory not allocated!");
exit(0);
}
// If array is not null
else
{
// Loop through sequence length, and add random values between 1 to 3
for (int i = 0; i < seqlen; ++i)
theSeq[i] = rand() % 3 + 1;
}
}
/* display the sequence on the terminal window, using the format from the sample run in the spec */
void showSeq(int *seq)
{
printf("Secret : ");
for (int i = 0; i < seqlen; ++i)
{
// printf(" %d ", theSeq[i]);
switch (theSeq[i])
{
case 1:
printf("R ");
break;
case 2:
printf("G ");
break;
case 3:
printf("B ");
break;
}
}
printf("\n");
}
#define NAN1 8
#define NAN2 9
// Count matches in ARM Assembly
/* counts how many entries in seq2 match entries in seq1 */
/* returns exact and approximate matches, either both encoded in one value, */
/* or as a pointer to a pair of values */
// int countMatches(int *seq1, int *seq2)
// {
// int correct = 0, approx = 0;
// int *check = (int *)malloc(SEQL * sizeof(int));
// asm(
// "\tMOV R0, #0 \n" // correct
// "\tMOV R1, %[seq1]\n" // A
// "\tMOV R2, %[seq2]\n" // B
// "\tMOV R3, %[check]\n" // C
// "\tMOV R4, #0\n" // counter
// "exactLoop:\n"
// "\tLDR R5, [R1], #4\n" // loading array value and incrementing index by 8 to access values at even positions
// "\tLDR R6, [R2], #4\n"
// "\tCMP R5, R6\n"
// "\tBNE check\n"
// "\tBL exactValue\n" // loop again if they are not equal
// "increment:\n"
// "\tADD R4, #1\n" // counter + 1
// "\tCMP R4, #3\n" // counter > 3
// "\tBLT exactLoop\n"
// "\tB exitE\n"
// "check:\n"
// "\tMOV R5, #0\n"
// "\tSTR R5, [R3]\n"
// "\tADD R3, #4\n"
// "\tB increment\n"
// "exactValue:\n"
// "\tADD R0, #1\n"
// "\tMOV R5, #1\n"
// "\tSTR R5, [R3]\n"
// "\tADD R3, #4\n"
// "\tBX LR\n"
// "exitE:\n"
// "\tMOV %[result], R0\n"
// : [result] "=r"(correct)
// : [seq1] "r"(seq1), [seq2] "r"(seq2), [check] "r"(check)
// : "r0", "r1", "r2", "r3", "r4","r5", "r6", "cc");
// if (correct != 3) {
// asm (
// "\tMOV R0, #0 \n" //appox
// "\tMOV R1,%[seq1]\n" //A
// "\tMOV R2,%[seq2]\n" // B
// "\tMOV R5, #0\n" //counter
// "outerLoop:\n"
// "\tADD R5, #1\n" // counter + 1
// "\tCMP R5, #4\n" // counter > 4
// "\tBGE exitA\n"
// "\tLDR R6, [R1], #4\n" // A[i]
// "\tLDR R7, [R2], #4\n" // B[i]
// "\tCMP R6, R7\n" // A[i] == B[i]
// "\tBEQ outerLoop\n" // repeat
// "\tMOV R3, %[check]\n" // C
// "\tMOV R4, %[seq2]\n" // B
// "\tMOV R7, #0\n" // j
// "innerLoop:\n"
// "\tADD R7, #1\n"
// "\tCMP R7, #4\n"
// "\tBGE innerLoop\n"
// "\tLDR R8, [R3], #4\n" // check[j]
// "\tADD R4, #4\n" // B[j]
// "\tCMP R8, #0\n"
// "\tBEQ condition2\n"
// "\tB innerLoop\n"
// "condition2:\n"
// "\tCMP R5, R7\n"
// "\tBNE condition3\n"
// "\tB innerLoop\n"
// "condition3:\n"
// "\tSUB R4, #4\n"
// "\tLDR R8, [R4]\n"
// "\tADD R4, #4\n"
// "\tCMP R6, R8\n"
// "\tBEQ approxValue\n"
// "\tB innerLoop\n"
// "approxValue:\n"
// "\tADD R0, #1\n"
// "\tMOV R8, #1\n"
// "\tSUB R3, #4\n"
// "\tSTR R8, [R3]\n"
// "\tADD R3, #4\n"
// "\tB outerLoop\n"
// "exitA:\n"
// "\tMOV %[result], R0\n"
// : [result] "=r"(approx)
// : [seq1] "r"(seq1), [seq2] "r"(seq2), [check] "r"(check)
// : "r0", "r1", "r2", "r3", "r4","r5", "r6", "r7", "r8", "cc");
// }
// free(check);
// int result = concat(correct, approx);
// return result;
// }
// Count matches in C
int /* or int* */ countMatches(int *seq1, int *seq2)
{
/* *** COMPLETE the code here *** */
// Loop index variables
int i, j, k, m;
// Temporary array for flagging seen colours
int *check = (int *)malloc(seqlen * sizeof(int));
// Variables for holding correct and approximate guesses
int correct = 0, approx = 0;
// Fill initial check flag array with 0's
for (i = 0; i < seqlen; i++)
check[i] = 0;