RS485.h

00001 #include "mbed.h"
00002 
00003 
00004 //---------------------------------------
00005 // Definitions
00006 //---------------------------------------
00007 #define RS485_BUFFER_LENGTH      512
00008 #define RS485_RX_TIMEOUT_US      300
00009 #define RS485_TX_TIMEOUT_US      300
00010 #define RS485_BAUDRATE           38400  // Same as Display
00011 #define RS485_BITS               8
00012 #define RS485_STOPBIT            1
00013 
00014 //---------------------------------------
00015 // Enums
00016 //---------------------------------------
00017 typedef enum
00018 {
00019     RS485_MODE_LISTEN,
00020     RS485_MODE_RX_READY,
00021     //-----------------
00022     CNT_eRS485_mode
00023 }eRS485_mode;
00024 
00025 
00026 //---------------------------------------
00027 // Structures
00028 //---------------------------------------
00029 typedef struct
00030 {
00031     eRS485_mode mode;       // mode of RS485 hardware
00032     char *ptrRXBuffer;      // actual read position in buffer
00033     char bytesToRead;       // Number of received bytes
00034 }sRS485_handler;
00035 
00036 
00037 
00038 //---------------------------------------
00039 // Global Variables
00040 //---------------------------------------
00041 extern sRS485_handler RS485_handler;
00042 extern char RS485Buffer[RS485_BUFFER_LENGTH];
00043 
00044 
00045 //---------------------------------------
00046 // Global Functions
00047 //---------------------------------------
00048 void RS485_init( void );
00049 void RS485_reset( void );            // clear all RS485 registers, --> restart    
00050 int RS485_receiveData( char *& ptrData, int *ptrNumBytes );
00051 int RS485_sendData( char *ptrDataToSend, int NumBytes );
00052 int RS485_sendDataWithCRC( char *ptrDataToSend, int NumBytes );