hoge.ino

const int pins[16][4] =  {
	{LOW,LOW,LOW,LOW},
	{LOW,LOW,LOW,HIGH},
	{LOW,LOW,HIGH,LOW},
	{LOW,LOW,HIGH,HIGH},
	{LOW,HIGH,LOW,LOW},
	{LOW,HIGH,LOW,HIGH},
	{LOW,HIGH,HIGH,LOW},
	{LOW,HIGH,HIGH,HIGH},
	{HIGH,LOW,LOW,LOW},
	{HIGH,LOW,LOW,HIGH},
	{HIGH,LOW,HIGH,LOW},
	{HIGH,LOW,HIGH,HIGH},
	{HIGH,HIGH,LOW,LOW},
	{HIGH,HIGH,LOW,HIGH},
	{HIGH,HIGH,HIGH,LOW},
	{HIGH,HIGH,HIGH,HIGH}
};

const unsigned char key_code[16][8] = {
	{0,0,0,0,0,0,0,0},
	{0,68,67,66,0,0,40,0},
	{8,7,6,5,4,47,10,9},
	{8,15,14,13,12,11,18,17},
	{24,23,22,21,20,19,26,50},
	{24,137,48,29,28,27,45,46},
	{55,33,32,31,30,39,36,35},
	{55,54,51,52,38,37,135,56},
	{0,227,42,79,82,76,224,229},
	{226,61,60,59,58,53,41,44},
	{0,0,70,80,81,43,57,65},
	{0,0,0,0,64,63,0,0},
	{0,0,0,0,0,0,0,0},
	{0,0,0,0,0,0,0,0},
	{0,0,0,0,0,0,0,0},
	{0,0,0,0,0,0,0,0}
};

void setup() {
	Serial.begin(9600);
	// set OUTPUT pins(analog in/out)
	for(int i=14;i<=17;i++){
		pinMode(i,OUTPUT);
	}
	// set INPUT pins(digital in/out)
	for(int i=2;i<=9;i++){
		pinMode(i,INPUT);
		digitalWrite(i,HIGH);
	}
}

void loop() {
	unsigned char buffer[8] = {0};
	int seek = 2;

	for(int column=0;column<16;column++){
		for(int i=14;i<=17;i++){
			digitalWrite(i,pins[column][i-14]);
		}
		for(int i=2,row=0;i<=9;i++,row++){
			if(digitalRead(i)==LOW)
			{
				if(key_code[column][row]==0xe1){buffer[0]+=0x02;continue;}//lsh
				if(key_code[column][row]==0xe0){buffer[0]+=0x01;continue;}//lct
				if(key_code[column][row]==0xe2){buffer[0]+=0x04;continue;}//lal
				if(key_code[column][row]==0xe5){buffer[0]+=0x20;continue;}//rsh
				if(searchBuffer(buffer,key_code[column][row]))continue;
				buffer[seek] = key_code[column][row];
				seek++;
			}
		}
	}
	Serial.write(buffer,8);
}

int searchBuffer(unsigned char *buffer,unsigned char c){
	for(int k=2;k<8;k++){
		if(buffer[k]==c)return 1;
	}
	return 0;
}