Created
June 20, 2014 17:42
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Assembly Code to search for a value in memory
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| /* | |
| * midterm.asm | |
| * | |
| * Created: 6/20/2014 11:41:46 AM | |
| * Author: Josh | |
| */ | |
| .org 0x0 | |
| ldi r29,0x00 | |
| ldi r30,0x10 | |
| ldi r31,0xFF | |
| start: | |
| // sets PORTE data direction to read | |
| sts PORTE_DIR, r29 | |
| // loads the contents of PORTE to r16 | |
| lds r16, PORTE_IN | |
| // sets X pointer register to 0 | |
| clr XL | |
| clr XH | |
| search: | |
| // load to r17 from X pointer register | |
| ld r17,X+ | |
| // check to make sure it isn't comparing r17 with r16 | |
| cpi r17, 0x10 // 0x10 is the location of r16 | |
| breq search | |
| // compare r16 and r17 | |
| cp r16,r17 | |
| // if equal, light led | |
| breq lightLED | |
| // if at end of memory, restart | |
| rjmp start | |
| // go back to search | |
| rjmp search | |
| lightLED: | |
| // sets PORTF data direction to write | |
| sts PORTF_DIR, r30 | |
| // loads the contents of PORTE to r16 | |
| sts PORTF_OUT, r31 | |
| // infinite loop | |
| rjmp lightLED |
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