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Altera_Forum's avatar
Altera_Forum
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20 years ago

Asm code and C imme

Hi, In my project, I define a imme in *.c file: #define SPI_0_BASE 0x00800980 In one of my asm routine, I wanna use this imme, how could I do? asm("movhi r15,%hi(SPI_0_BASE...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

Maybe try like this example : 

#define CUSTOM_INSTRUCTION_TEST 6
//expand the contents of val to "xxx"# define _str_(val)# val# define __str__(val) _str_(val)
__asm__ volatile ("custom " __str__(CUSTOM_INSTRUCTION_TEST) ", r0, r0, r0");

This generates : 

custom 6,r0,r0,r0

For your problem, maybe this should work in the same way 

__asm__ volatile ("movhi r15,%hi" __str__(SPI_0_BASE));