- renamed folder

git-svn-id: http://moon:8086/svn/projects/HendiControl@161 fda53097-d464-4ada-af97-ba876c37ca34
2019-03-30 00:53:10 +00:00
parent 9035753d6c
commit d2a116ce13
17 changed files with 0 additions and 0 deletions
@@ -0,0 +1,76 @@
+/*
+ * i2c.c
+ *
+ * Created: 20.02.2019 20:33:30
+ *  Author: jens
+ */ 
+
+#include <stdio.h>
+#include <avr/io.h>
+#include "i2c.h"
+
+void i2c_init()
+{
+	TWBR = 0xFF;
+	TWSR = 0x00;
+}
+
+void i2c_send(uint8_t addr, uint8_t rw, uint8_t *data, size_t size)
+{
+	TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);
+	// Send START condition
+	do
+	{
+		while (!(TWCR &(1<<TWINT)));	// Wait for TWINT Flag set. This indicates
+		// that the START condition has been
+		// transmitted.
+		if((TWSR & 0xF8) != I2C_START)
+		{
+			printf("Error I2C_START\n");
+			break;
+		}
+		TWDR = addr<<1 | rw;					// Load SLA_W into TWDR Register. Clear
+		// TWINT bit in TWCR to start transmission of
+		// address.
+		TWCR = (1<<TWINT) | (1<<TWEN);
+		while (!(TWCR &(1<<TWINT)));	// Wait for TWINT Flag set. This indicates
+		// that the SLA+W has been transmitted, and
+		// ACK/NACK has been received.
+
+
+		if ((TWSR & 0xF8) != I2C_SLA_ACK)
+		{
+			printf("Error I2C_SLA_ACK\n");
+			break;
+		}
+		// Check value of TWI Status Register. Mask
+		// prescaler bits. If status different from
+		// MT_SLA_ACK go to ERROR
+		for (size_t i=0; i < size; i++)
+		{
+			
+			TWDR = *(data++);
+			TWCR = (1<<TWINT) | (1<<TWEN);
+			// Load DATA into TWDR Register. Clear
+			// TWINT bit in TWCR to start transmission of
+			// data.
+
+			while (!(TWCR & (1<<TWINT)));
+			// Wait for TWINT Flag set. This indicates
+			// that the DATA has been transmitted, and
+			// ACK/NACK has been received}
+
+			if ((TWSR & 0xF8) != I2C_DATA_ACK)
+			{
+				printf("Error I2C_DATA_ACK\n");
+				break;
+			}
+			//	Check value of TWI Status Register. Mask
+			//	prescaler bits. If status different from
+			//	MT_DATA_ACK go to ERROR.
+		}
+		
+	} while (0);
+	TWCR = (1<<TWINT)| (1<<TWEN)|(1<<TWSTO);	// Transmit STOP condition.
+
+}