Hi,
There are a couple of ways to use i/o address in assymbly.
Below i used a some:
#define _EEARL_ "0x1E"
uint8_t portFSReadByte(unsigned char * pAddress)
{ uint8_t result;
asm volatile ( \
"in r26, __SREG__ \n\t"
"cli \n\t"
"out %2, %A0 \n\t"
"out "_EEARL_", %B0 \n\t"
"sbi __EECR__, 0 \n\t"
"in %A0, 0x1D \n\t"
"out __SREG__, r26 \n\t"
"" :"=r" (result) :"0" (pAddress), "I" (_SFR_IO_ADDR(EEARH)) : "r26" );
return result; }
(1) You can define a constant, like i did for _EEARL_
This is nice but no so portable.
(2) You can use the asm paramter list, like for EEARH
Also nice, but errorprone, since i keep making mistakes in
numbering, especially when you have many parameters and
have to change something.
(3) The best thing to have would be something like __EECR__,
resembling the definition for __SREG__, but that does not
compile right now.
Is the latter possible somehow? Or are there other solutions?
greetings
Ruud.
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