Fix Sniffer tool

Author: NaejEL

README.md

@@ -1 +1,129 @@
-# flipperzero-i2ctools
+# flipperzero-i2ctools
+
+```c
+typedef struct 
+{
+  unsigned int PIN0:1;
+  unsigned int PIN1:1;
+  unsigned int PIN2:1;
+  unsigned int PIN3:1;
+  unsigned int PIN4:1;
+  unsigned int PIN5:1;
+  unsigned int PIN6:1;
+  unsigned int PIN7:1;
+} PORT;
+
+/* TODO: Example address shown, but the proper address */
+#define PORT0 *(volatile PORT *)0x1234
+
+/* Define the port used for I2C data and clk as shown above to access them pin wise */
+#define I2C_DATA PORT0.PIN0
+#define I2C_CLK  PORT0.PIN1
+
+#define HIGH 1
+#define LOW  0
+
+/* I2C Start - bit bang */
+void I2C_START(void)
+{
+    /* I2C Start condition, data line goes low when clock is high */
+    I2C_DATA = HIGH;
+    I2C_CLK = HIGH;
+    I2C_DATA = LOW;
+    I2C_CLK = LOW;
+}
+
+/* I2C Stop - bit bang */
+void I2C_STOP (void)
+{
+    /* I2C Stop condition, clock goes high when data is low */
+    I2C_CLK = LOW;
+    I2C_DATA = LOW;
+    I2C_CLK = HIGH;
+    I2C_DATA = HIGH;
+}
+
+/* I2C Write - bit bang */
+void I2C_WRITE(unsigned char data)
+{
+	unsigned char outBits;
+	unsigned char inBit;
+	
+ 	/* 8 bits */
+	for(outBits = 0; outBits < 8; outBits++) 
+	{
+	    if(data & 0x80)
+		    I2C_DATA = 1;
+		else
+		    I2C_DATA = 0;
+      	data  <<= 1;
+		/* Generate clock for 8 data bits */
+		SCLK = HIGH;
+		SCLK = LOW;					
+	}
+	
+	/* Generate clock for ACK */
+	I2C_CLK = HIGH;
+        /* Wait for clock to go high, clock stretching */
+        while(I2C_CLK);
+        /* Clock high, valid ACK */
+	inBit = I2C_DATA;
+	I2C_CLK = LOW;					
+}
+
+unsigned char I2C_READ (void)
+{
+	unsigned char inData, inBits;
+
+	inData = 0x00;
+	/* 8 bits */
+	for(inBits = 0; inBits < 8; inBits++)
+	{
+		inData <<= 1;
+		I2C_CLK = HIGH;
+      	inData |= I2C_DATA;
+		I2C_CLK = LOW;					
+	}
+
+   return inData;
+}
+
+/* Examble for writing to I2C Slave */
+void writeI2CSlave (unsigned char data)	
+{
+    /* Start */
+  	I2C_START();
+	/* Slave address */
+   	I2C_WRITE(0xAA)
+	/* Slave control byte */
+   	I2C_WRITE(0xBB);
+	/* Slave data */
+   	I2C_WRITE(data);
+	/* Stop */
+   	I2C_STOP();
+}
+
+/* Examble for reading from I2C Slave */
+unsigned char readI2CSlave(unsigned char data)
+{
+   	unsigned char inData;
+
+	/* Start */
+  	I2C_START(); 
+	/* Slave address */
+   	I2C_WRITE(0xAA);
+	/* Slave control byte */
+   	I2C_WRITE(data);
+	/* Stop */
+   	I2C_STOP();
+	
+	/* Start */
+   	I2C_START();
+	/* Slave address + read */
+   	I2C_WRITE(0xAA | 1);
+	/* Read */
+	inData = I2C_READ();
+
+   	return inData;                 
+}
+```