C »ã±à»ìºÏ±à³Ì
As is Known to us,the function Main is the entry point of all programs.Therefore, we are usually neglecting all that we don't do,which makes us not understanding it more clearly.Now there is a sample arm program which will provide something that opration system usually do.
asm:
IMPORT main
area test,CODE,READONLY
ENTRY
bl start
start
bl main
C:
#define rGPBCON (*(volatile unsigned *)0x56000010) //Port B control
#define rGPBDAT (*(volatile unsigned *)0x56000014) //Port B data
#define rGPBUP (*(volatile unsigned *)0x56000018) //Pull-up control B
int main(int argc, char *argv[])
{
unsigned int temp = 0x0e;
rGPBCON = 0x00555555;
rGPBUP = 0xffff;
rGPBDAT = 0XE1F;
return 0;
}
The code very sample,but it is very useful.
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