Updated Readme with example

twi/twi_master.h

@@ -0,0 +1,39 @@
+/*
+ * twi_master.h
+ *
+ * Created: 09-Jun-19 11:20:04 AM
+ *  Author: TEP SOVICHEA
+ */ 
+
+
+#ifndef TWI_MASTER_H_
+#define TWI_MASTER_H_
+
+#include <avr/io.h>
+#include <util/twi.h>
+#include <stdbool.h>
+
+#define DEBUG_LOG			0
+#define SUCCESS				0
+
+#define TW_SCL_PIN			PORTC5
+#define TW_SDA_PIN			PORTC4
+
+#define TW_SLA_W(ADDR)		((ADDR << 1) | TW_WRITE)
+#define TW_SLA_R(ADDR)		((ADDR << 1) | TW_READ)
+#define TW_READ_ACK			1
+#define TW_READ_NACK		0
+
+typedef uint16_t ret_code_t;
+
+typedef enum {
+	TW_FREQ_100K,
+	TW_FREQ_250K,
+	TW_FREQ_400K
+} twi_freq_mode_t;
+
+void tw_init(twi_freq_mode_t twi_freq, bool pullup_en);
+ret_code_t tw_master_transmit(uint8_t slave_addr, uint8_t* p_data, uint8_t len, bool repeat_start);
+ret_code_t tw_master_receive(uint8_t slave_addr, uint8_t* p_data, uint8_t len);
+
+#endif /* TWI_MASTER_H_ */