/*
 * rsbus.h
 *
 *  Created on: 2014-4-26
 *      Author: Tuowen
 */

// DE RSOUT.RSPIN HIGH ENABLE
// RE LOW ENABLE -> ALWAYS ENABLE
// RECEIVE QUERY -> Conditional FNC call
//		Process -> Output (Done in main program)
// SMCLK set to 4MHZ


#ifndef RSBUS_H_
#define RSBUS_H_

#include<msp430g2553.h>
#include"precomp.h"

// MAXIMUM length to be send
#define RS_MAX   (14)

#define ST_BUSY (0x04)
#define ST_RUN (0x02)
#define ST_RES (0x01)
#define ST_REST (0x00)

// Switch the machine to a new state specified above
// This will shown on the network -> must call
#define SWITCH_STATE(STATE) (mac_stat[0]=STATE)

// Changing the state value (unsigned char) ->
//		Available indices 0,1,2
#define STATE(X) (mac_stat[X+1])

// Start and Stop bits definition
// 		Every message sent that does not agree with it will be ignored
// 		Please avoid this pattern in STATE(X)
#define STBIT0 (0x5B)
#define STBIT1 (0xAD)
#define EDBIT0 (0xA4)
#define EDBIT1 (0x52)

// Receieve handler ->
//	Received message and it's length
typedef void (*rshdlr)(unsigned char* msg,unsigned int len);

// RSBUS init function
// Setting up UART, DE pin, receieve handler
void rsbus_init(rshdlr);

// Send something to the rs422 bus
// Length must not exceeds RS_MAX
void rsbus_w(int,unsigned char*,unsigned int);

// Machine status -> change it to change the auto respond status
// 		0 is reserved for machine state specification
// 		1-3 used for mac_type specific state
// recommend using SWITCH_STATE & STATE
extern volatile unsigned char mac_stat[4];

#endif /* RSBUS_H_ */