// standard ASCII symbols 
#define CR   0x0D
#define LF   0x0A
#define BS   0x08
#define ESC  0x1B
#define SP   0x20       
#define DEL  0x7F

//-------------------------SCI0_Init------------------------
// Initialize Serial port SCI0
// Output: none
extern void SCI0_Init(void);
 
//-------------------------SCI0_InStatus--------------------------
// Checks if new input is ready, TRUE if new input is ready
// Input: none
// Output: TRUE if a call to InChar will return right away with data
//         FALSE if a call to InChar will wait for input
extern char SCI0_InStatus(void);  

//-------------------------SCI0_InChar------------------------
// Wait for new serial port input, busy-waiting synchronization
// Input: none
// Output: ASCII code for key typed
extern char SCI0_InChar(void);

extern int SCI0_InString(char *, unsigned short); // Reads in a String of max length

//----------------------SCI0_InUDec-------------------------------
// InUDec accepts ASCII input in unsigned decimal format
//     and converts to a 16 bit unsigned number
//     valid range is 0 to 65535
// Input: none
// Output: 16-bit unsigned number
// If you enter a number above 65535, it will truncate without an error
// Backspace will remove last digit typed
extern unsigned short SCI0_InUDec(void);   

//---------------------SCI0_InUHex----------------------------------------
// Accepts ASCII input in unsigned hexadecimal (base 16) format
// Input: none
// Output: 16-bit unsigned number
// No '$' or '0x' need be entered, just the 1 to 4 hex digits
// It will convert lower case a-f to uppercase A-F
//     and converts to a 16 bit unsigned number
//     value range is 0 to FFFF
// If you enter a number above FFFF, it will truncate without an error
// Backspace will remove last digit typed
extern unsigned short SCI0_InUHex(void);  

//-----------------------SCI0_OutStatus----------------------------
// Checks if output data buffer is empty, TRUE if empty
// Input: none
// Output: TRUE if a call to OutChar will output and return right away
//         FALSE if a call to OutChar will wait for output to be ready
extern char SCI0_OutStatus(void);   

//-------------------------SCI0_OutChar------------------------
// Wait for buffer to be empty, output 8-bit to serial port
// busy-waiting synchronization
// Input: 8-bit data to be transferred
// Output: none
extern void SCI0_OutChar(char);  
 
//-----------------------SCI0_OutUDec-----------------------
// Output a 16-bit number in unsigned decimal format
// Input: 16-bit number to be transferred
// Output: none
// Variable format 1-5 digits with no space before or after
extern void SCI0_OutUDec(unsigned short);    

//-------------------------SCI0_OutString------------------------
// Output String (NULL termination), busy-waiting synchronization
// Input: pointer to a NULL-terminated string to be transferred
// Output: none
extern void SCI0_OutString(char *pt); 
 
//--------------------------SCI0_OutUHex----------------------------
// Output a 16 bit number in unsigned hexadecimal format
// Input: 16-bit number to be transferred
// Output: none
// Variable format 1 to 4 digits with no space before or after
extern void SCI0_OutUHex(unsigned short);