/* ****************SCI1.H********
  Jonathan W. Valvano   April 17, 2000
  RS485 half-duplex multiport network  
  Hardware: 
     Adapt812 MC68HC812A4 SCI1 serial port
     RS-485 half-duplex network to other Adapt812s 
     6812 PS3/TXD1 connected to SP483 DI data in 
     6812 PS2/RXD1 connected to SP483 RO receive out
     6812 PE6      connected to SP483 DE 1 enables transmission 
     6812 PE5      connected to SP483 RE 0 enables receiver 
     SP483 A-A, B-B, ground-ground */
// transmission error codes 
#define OK 0
#define COLLISION 1
#define TIMEOUT 2
#define PARITYERROR 4
// receiver errors
#define OR  0x08
#define NF  0x04
#define FE  0x02
#define PF  0x01

//------------Initialization-------------------------------------
void SCI1Init(void);   // Initialize 38400 bits/sec 

//--------------Input/Receive from RS485 channel-------------------
char SCI1In(int *);      // Reads in a character, gadfly wait
// returns by value the ASCII character from the RS485 network
// returns by reference, 1-15 for errors, 0 for no error
//    receiver errors are Bit3=OR, Bit2=NF, Bit1=FE, Bit0=PF
int SCI1InStatus(void);   
// Returns TRUE if a call to SCI1In will return right away

//--------------Output/Transmit to RS485 channel-------------------
int SCI1Out(char);       // Output a character, gadfly wait
// returns OK(0), COLLISION(1), TIMEOUT(2) or PARITYERROR(4) 
int SCI1OutString(char *);   // Output a string, gadfly wait 
// returns OK(0), COLLISION(1), TIMEOUT(2) or PARITYERROR(4)