Seven-segment display using 595 - c

Question

I am having some trouble coding my seven-segment display using a shift register and push button. The aim is for the display to count up when the button is pressed. 0-9 then; A, B, C, D, E, and F. I did manage to get this working at first but the task was changed so the "shiftOut" command was not allowed to be used.
With my adjusted code my seven-segment display doesn't seem to be working at all now. I have tried to do a lot of my own troubleshooting (i.e. looking into debouncing, arrays, and bit-banging). Any help would be appreciated. Thanks. PS: this is my first question so sorry if the format is wrong.
/* Pins to connect to common-cathode LED display via a 74HC595:
DP-7, A-6, B-5, C-4, D-3, E-2, F-1, G-15
*/
const byte ledCharSet[128] = {
// 00-0F: Hex digits
B10000001, B11001111, B10010010, B10000110, // 0123
B11001100, B10100100, B10100000, B10001111, // 4567
B10000000, B10000100, // 89
B10001000, B11100000, B10110001, B11000010, // AbCd
B10110000, B10111000, // EF
};
//// Pin connected to latch pin (ST_CP) of 74HC595
const int latchPin = 8;
//// Pin connected to clock pin (SH_CP) of 74HC595
const int clockPin = 12;
//// Pin connected to Data in (DS) of 74HC595
const int dataPin = 11;
//// Pin connected to display's common annode
const int faderPin = 10;
int _B = 7;
bool b;
int count=0;
int value;
long time = 0;
long debounce = 500;
void setup() {
pinMode(latchPin, OUTPUT);
pinMode(clockPin, OUTPUT);
pinMode(dataPin, OUTPUT);
pinMode(_B, INPUT_PULLUP);
b = true;
toggleLatch();
toggleCLK();
Serial.begin(9600);
}
void toggleLatch() {
digitalWrite(latchPin, HIGH); digitalWrite(latchPin, OUTPUT);
}
void toggleCLK() {
digitalWrite(clockPin, HIGH); digitalWrite(clockPin, LOW);
}
void loop() {
unsigned char count; // debounce counter
if (b != digitalRead(_B)) {
for(count = 0; count<20 && b != digitalRead(_B); count++);
//register the change if we have confirmed it 20 consecutive times
b=((count>=20 && b!=digitalRead(_B))?!b:b);
if(!b) {
count--;
} // button is pushed
}
toggleLatch();
void shiftBit(bool dataPin) { digitalWrite(ledCharSet,dataPin); toggleCLK(); }
void shiftByteMSF(unsigned char b) {
unsigned char b = ledCharSet[count];
unsigned char m; // use m to select the bits in b one at a time
m = 1;
for (m = B10000000; m>0; m <<= 1) {
if (b & m) {
digitalWrite(dataPin, HIGH);
} else {
digitalWrite(dataPin, LOW);
}
}
toggleLatch();
}
if (count==16) {
count=0; //reset
}
}
This is the first code I used, which worked fine.
/* Pins to connect to common-cathode LED display via a 74HC595:
DP-7, A-6, B-5, C-4, D-3, E-2, F-1, G-15 (shiftOut using MSBFIRST)
*/
const byte ledCharSet[128] = {
// 00-0F: Hex digits
B10000001, B11001111, B10010010, B10000110, // 0123
B11001100, B10100100, B10100000, B10001111, // 4567
B10000000, B10000100, // 89
B10001000, B11100000, B10110001, B11000010, // AbCd
B10110000, B10111000, // EF
};
//// Pin connected to latch pin (ST_CP) of 74HC595
const int latchPin = 8;
//// Pin connected to clock pin (SH_CP) of 74HC595
const int clockPin = 12;
//// Pin connected to Data in (DS) of 74HC595
const int dataPin = 11;
//// Pin connected to display's common annode
const int faderPin = 10;
int _B = 7;
int reading;
int previous = LOW;
int counter=0;
long time = 0;
long debounce = 500;
void setup() {
pinMode(latchPin, OUTPUT);
pinMode(clockPin, OUTPUT);
pinMode(dataPin, OUTPUT);
pinMode(_B, INPUT_PULLUP);
Serial.begin(9600);
}
void loop() {
reading = digitalRead(_B);
Serial.print(counter);
if (reading == HIGH && previous == LOW && millis() - time > debounce) {
counter++;
time = millis();
}
previous = reading;
byte bitsToSend = ledCharSet[counter];
bitsToSend = bitsToSend ^ B11111111;
digitalWrite(latchPin, LOW);
shiftOut(dataPin, clockPin, MSBFIRST, bitsToSend);
digitalWrite(latchPin, HIGH);
digitalWrite(11, 255);
digitalWrite(11, 0);
if (counter==16) {
counter=0; //reset count
}
}