Macros for reading, writing and testing registers

In order to simplify the code, the assembly code is interfaced through macros.

Macros
#define	CLASSB_RegClear_IO(reg)
	Clear IO-register. More...
#define	CLASSB_RegClear_R(reg)
	Clear R register. More...
#define	CLASSB_RegRestore_IO(reg)
	Restore IO-register content. More...
#define	CLASSB_RegRestore_R(reg)
	Load R register content from R31. More...
#define	CLASSB_RegSet_IO(reg, value)
	Set IO-register to specified value. More...
#define	CLASSB_RegSet_R_HI(reg, value)
	Set high R-register to specified value. More...
#define	CLASSB_RegSet_R_LO(reg, value)
	Set low R-register to specified value. More...
#define	CLASSB_RegStore_IO(reg)
	Store IO-register content. More...
#define	CLASSB_RegStore_R(reg)
	Save R register content to R31. More...
#define	CLASSB_RegTest_IO(reg, value, label)
	Test IO register with specified value, jump to specified label on fault. More...
#define	CLASSB_RegTest_R_HI(reg, value, label)
	Test R16-31 with specified value, jump to specified label on fault. More...
#define	CLASSB_RegTest_R_LO(reg, value, label)
	Test R0-15 with specified value, jump to specified label on fault. More...

#define CLASSB_RegClear_IO

(

reg

)

Value:

ASSEMBLY( \
    "clr r30 \n" \
    "out " #reg ", r30 \n" \
    )

Clear IO-register.

Parameters

reg	IO-address of register to clear.

Note

The IO-register is cleared via R30.

#define CLASSB_RegClear_R

(

reg

)

Value:

ASSEMBLY( \
    "clr " #reg " \n" \
    )

Clear R register.

Parameters

reg	R-register to clear.

Note

This macro works for any R-register (R0-R31).

#define CLASSB_RegRestore_IO

(

reg

)

Value:

ASSEMBLY( \
    "out " #reg ", r31 \n" \
    )

Restore IO-register content.

Parameters

reg	IO-address of register to restore.

Note

The value of the IO-register is restored from R31.

Referenced by classb_register_test().

#define CLASSB_RegRestore_R

(

reg

)

Value:

ASSEMBLY( \
    "mov " #reg ", r31 \n" \
    )

Load R register content from R31.

Parameters

reg	R-register to restore from R31.

Referenced by classb_register_test().

#define CLASSB_RegSet_IO	(		reg,
			value
	)

Value:

ASSEMBLY( \
    "ldi r30, " #value " \n" \
    "out " #reg ", r30 \n" \
    )

Set IO-register to specified value.

Parameters

reg	IO-address of register to set.
value	Value to set register to.

Note

The value is copied into the specified register via R30.

Referenced by classb_register_test().

#define CLASSB_RegSet_R_HI	(		reg,
			value
	)

Value:

ASSEMBLY( \
    "ldi " #reg ", " #value " \n" \
    )

Set high R-register to specified value.

Parameters

reg	R-register to set (R16-R31).
value	Value to set R-register to.

Referenced by classb_register_test().

#define CLASSB_RegSet_R_LO	(		reg,
			value
	)

Value:

ASSEMBLY( \
    "ldi r30, " #value " \n" \
    "mov " #reg ", r30 \n" \
    )

Set low R-register to specified value.

Parameters

reg	R-register to set (R0-R15).
value	Value to set R-register to.

Note

The value is copied into the specified register via R30.

Referenced by classb_register_test().

#define CLASSB_RegStore_IO

(

reg

)

Value:

ASSEMBLY( \
    "in r31, " #reg " \n" \
    )

Store IO-register content.

Parameters

reg	IO-address of register to store.

Note

The value of the IO-register is stored in R31.

Referenced by classb_register_test().

#define CLASSB_RegStore_R

(

reg

)

Value:

ASSEMBLY( \
    "mov r31, " #reg " \n" \
    )

Save R register content to R31.

Parameters

reg	R-register to store in R31.

Referenced by classb_register_test().

#define CLASSB_RegTest_IO	(		reg,
			value,
			label
	)

Value:

ASSEMBLY( \
    "ldi r30, " #value " \n" \
    "out " #reg ", r30 \n" \
    "in r30, " #reg " \n" \
    "cpi r30, " #value " \n" \
    "breq A_" STRINGIZE(LABEL(reg,value,__LINE__)) " \n" \
    "jmp " STRINGIZE(label) " \n" \
    "A_" STRINGIZE(LABEL(reg,value,__LINE__)) ": \n" \
    )

Test IO register with specified value, jump to specified label on fault.

Note

R30 is used in the copying of values to the register.

Parameters

reg	Address of IO register to test.
value	Value to test register with.
label	Label to jump to if test fails.

Referenced by classb_register_test().

#define CLASSB_RegTest_R_HI	(		reg,
			value,
			label
	)

Value:

ASSEMBLY( \
    "ldi " #reg ", " #value " \n" \
    "cpi " #reg ", " #value " \n" \
    "breq A_" STRINGIZE(LABEL(reg,value,__LINE__)) " \n" \
    "jmp " STRINGIZE(label) " \n" \
    "A_" STRINGIZE(LABEL(reg,value,__LINE__))  ": \n" \
    )

Test R16-31 with specified value, jump to specified label on fault.

Parameters

reg	Register to test (R16..R31).
value	Value to test register with.
label	Label to jump to if test fails.

Referenced by classb_register_test().

#define CLASSB_RegTest_R_LO	(		reg,
			value,
			label
	)

Value:

ASSEMBLY( \
    "ldi r30, " #value " \n" \
    "mov " #reg ", r30 \n" \
    "mov r30, " #reg " \n" \
    "cpi r30, " #value " \n" \
    "breq A_" STRINGIZE(LABEL(reg,value,__LINE__)) " \n" \
    "jmp " STRINGIZE(label) " \n" \
    "A_" STRINGIZE(LABEL(reg,value,__LINE__)) ": \n" \
    )

Test R0-15 with specified value, jump to specified label on fault.

Note

R30 is used in the copying values to the register.

Parameters

reg	Register to test (R0..R15).
value	Value to test register with.
label	Label to jump to if test fails.

Referenced by classb_register_test().