From e12fc5e3f0bec08274794f954fa114323c874e09 Mon Sep 17 00:00:00 2001
From: Stanley Huang <stanleyhuangyc@gmail.com>
Date: Wed, 25 Nov 2015 22:58:32 +1100
Subject: Add touch screen support

---
 megalogger/touch.h | 127 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 megalogger/touch.h

(limited to 'megalogger/touch.h')

diff --git a/megalogger/touch.h b/megalogger/touch.h
new file mode 100644
index 0000000..93ba740
--- /dev/null
+++ b/megalogger/touch.h
@@ -0,0 +1,127 @@
+#define T_CLK 6
+#define T_CS 5
+#define T_DIN 4
+#define T_DOUT 3
+#define T_IRQ 2
+
+#define X_CONST 240
+#define Y_CONST 320
+
+#define PREC_TOUCH_CONST 10
+
+#define PixSizeX	13.78
+#define PixOffsX	411
+
+#define PixSizeY	11.01
+#define PixOffsY	378
+
+class CTouch {
+public:
+	void init(void)
+	{
+		pinMode(T_CLK,  OUTPUT);
+		pinMode(T_CS,   OUTPUT);
+		pinMode(T_DIN,  OUTPUT);
+		pinMode(T_DOUT, INPUT);
+		pinMode(T_IRQ,  INPUT);
+
+		digitalWrite(T_CS,  HIGH);
+		digitalWrite(T_CLK, HIGH);
+		digitalWrite(T_DIN, HIGH);
+		digitalWrite(T_CLK, HIGH);
+	}
+
+	void writeData(unsigned char data)
+	{
+		unsigned char temp;
+		unsigned char nop;
+		unsigned char count;
+
+		temp=data;
+		digitalWrite(T_CLK,LOW);
+
+		for(count=0; count<8; count++)
+		{
+			if(temp & 0x80)
+				digitalWrite(T_DIN, HIGH);
+			else
+				digitalWrite(T_DIN, LOW);
+			temp = temp << 1; 
+			digitalWrite(T_CLK, LOW);                
+			nop++;
+			digitalWrite(T_CLK, HIGH);
+			nop++;
+		}
+	}
+
+	unsigned int readData()
+	{
+		unsigned char nop;
+		unsigned int data = 0;
+		unsigned char count;
+		for(count=0; count<12; count++)
+		{
+			data <<= 1;
+			digitalWrite(T_CLK, HIGH);               
+			nop++;
+			digitalWrite(T_CLK, LOW);
+			nop++;
+			if (digitalRead(T_DOUT))
+				data++;
+		}
+		return(data);
+	}
+
+	void read()
+	{
+		unsigned long tx=0;
+		unsigned long ty=0;
+
+		digitalWrite(T_CS,LOW);                    
+
+		for (int i=0; i<PREC_TOUCH_CONST; i++)
+		{
+			writeData(0x90);        
+			digitalWrite(T_CLK,HIGH);
+			digitalWrite(T_CLK,LOW); 
+			ty+=readData();
+
+			writeData(0xD0);      
+			digitalWrite(T_CLK,HIGH);
+			digitalWrite(T_CLK,LOW);
+			tx+=readData();
+		}
+
+		digitalWrite(T_CS,HIGH);
+
+		TP_X=tx/PREC_TOUCH_CONST;
+		TP_Y=ty/PREC_TOUCH_CONST;
+	}
+
+	bool available()
+	{
+		return digitalRead(T_IRQ) == 0;
+	}
+
+	int getX()
+	{
+		int value;
+		value = ((TP_X-PixOffsX)/PixSizeX);
+		if (value < 0)
+			value = 0;
+		return value;
+	}
+
+	int getY()
+	{
+		int value;
+		value = ((TP_Y-PixOffsY)/PixSizeY);
+		if (value < 0)
+			value = 0;
+		return value;
+	}
+private:
+	int TP_X,TP_Y;
+};
+
+CTouch touch;
-- 
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