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Clean up special serial port cases

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Assume SERIAL_PORT 0 if not defined. Collapse un-numbered register
special case. Clarify comments.
This commit is contained in:
Robert F-C 2012-11-07 09:00:21 +11:00
parent 5a998558a9
commit 99692dc99e
1 changed files with 7 additions and 15 deletions
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22
Marlin/MarlinSerial.h
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@ -24,7 +24,7 @@
#include "Marlin.h"
#if !defined(SERIAL_PORT)
#error SERIAL_PORT not set
#define SERIAL_PORT 0
#endif
// The presence of the UBRRH register is used to detect a UART.
@ -35,29 +35,21 @@
// These are macros to build serial port register names for the selected SERIAL_PORT (C preprocessor
// requires two levels of indirection to expand macro values properly)
#define SERIAL_REGNAME(registerbase,number,suffix) SERIAL_REGNAME_INTERNAL(registerbase,number,suffix)
#if SERIAL_PORT == 0 && !defined(UBRR0H)
#if SERIAL_PORT == 0 && (!defined(UBRR0H) || !defined(UDR0)) // use un-numbered registers if necessary
#define SERIAL_REGNAME_INTERNAL(registerbase,number,suffix) registerbase##suffix
#else
#else
#define SERIAL_REGNAME_INTERNAL(registerbase,number,suffix) registerbase##number##suffix
#endif
#endif
// Registers used by MarlinSerial class (these are expanded
// depending on selected serial port
#define M_UCSRxA SERIAL_REGNAME(UCSR,SERIAL_PORT,A) // defines M_UCSRxA to be UCSRxA where x is the serial port number
#define M_UCSRxA SERIAL_REGNAME(UCSR,SERIAL_PORT,A) // defines M_UCSRxA to be UCSRnA where n is the serial port number
#define M_UCSRxB SERIAL_REGNAME(UCSR,SERIAL_PORT,B)
#define M_RXENx SERIAL_REGNAME(RXEN,SERIAL_PORT,)
#define M_TXENx SERIAL_REGNAME(TXEN,SERIAL_PORT,)
#define M_RXCIEx SERIAL_REGNAME(RXCIE,SERIAL_PORT,)
#define M_UDREx SERIAL_REGNAME(UDRE,SERIAL_PORT,)
#if SERIAL_PORT == 0 && !defined(UDR0)
#if defined(UDR)
#define M_UDRx UDR // atmega8, atmega32
#else
#error UDR not defined
#endif
#else
#define M_UDRx SERIAL_REGNAME(UDR,SERIAL_PORT,)
#endif
#define M_UDRx SERIAL_REGNAME(UDR,SERIAL_PORT,)
#define M_UBRRxH SERIAL_REGNAME(UBRR,SERIAL_PORT,H)
#define M_UBRRxL SERIAL_REGNAME(UBRR,SERIAL_PORT,L)
#define M_RXCx SERIAL_REGNAME(RXC,SERIAL_PORT,)
@ -189,4 +181,4 @@ class MarlinSerial //: public Stream
extern MarlinSerial MSerial;
#endif // ! teensylu
#endif
#endif