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Author: ParthBasole

TWISLAVE.c

@@ -0,0 +1,69 @@
+/*
+ * TWISLAVE.c
+ *
+ * Created: 10-09-2018 16:04:50
+ *  Author: HP
+ */ 
+
+#include <avr/io.h>
+#ifndef TWI_FREQ
+#define TWI_FREQ 100000L
+#define F_CPU 16000000
+#endif
+void I2C_Init()			/* I2C initialize function */
+{
+	TWBR=((F_CPU / TWI_FREQ) - 16) / 2;	/* Get bit rate register value by formula */
+}
+uint8_t I2C_Start(void)/* I2C start function */
+{
+    uint8_t status;
+	int x;
+	DDRB=0b11111111;		/* Declare variable */
+    TWCR=(1<<TWSTA)|(1<<TWEN)|(1<<TWINT); /* Enable TWI, generate START */
+    while(!(TWCR&(1<<TWINT)))
+	{PORTB|=4;
+}	/* Wait until TWI finish its current job */
+    status=TWSR&0xF8;		/* Read TWI status register */
+    if(status!=0x08)		/* Check weather START transmitted or not? */
+    return 0;			/* Return 0 to indicate start condition fail */
+    TWDR=0b01111110;		/* Write SLA+W in TWI data register */
+    TWCR=(1<<TWEN)|(1<<TWINT);
+		/* Enable TWI & clear interrupt flag */
+    while(!(TWCR&(1<<TWINT)));
+	/* Wait until TWI finish its current job */
+    status=TWSR&0xF8;		/* Read TWI status register */	
+    if(status==0x18)		/* Check for SLA+W transmitted &ack received */
+    PORTB|=1;			
+	    if(status==0x20)		
+	   PORTB=2;	
+   			
+}
+void I2C_Stop()			
+{
+    TWCR=(1<<TWSTO)|(1<<TWINT)|(1<<TWEN);
+    while(TWCR&(1<<TWSTO));	
+}
+void I2C_Send(char x)
+{ uint8_t stat;
+	TWDR=x;
+	TWCR=(1<<TWINT)|(1<<TWEN);
+	
+	while(!(TWCR&(1<<TWINT)));
+	stat=TWSR&0xF8;
+	if(stat==0x28)
+	PORTB|=8;
+	if(stat==0x30)
+	PORTB|=16;
+}
+int main()
+{I2C_Init();
+	
+		I2C_Start();
+		I2C_Send();
+		I2C_Stop();
+		
+	
+	
+}	
+
+