Created
June 20, 2014 16:10
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Assembly Code To Read In From Ports
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| /* | |
| * midterm.asm | |
| * | |
| * Created: 6/20/2014 11:41:46 AM | |
| * Author: Josh | |
| */ | |
| .org 0x0 | |
| ldi r30,0x00 | |
| ldi r31,0x10 | |
| // sets PORTC and PORTE data direction to read | |
| sts PORTC_DIR, r30 | |
| sts PORTE_DIR, r30 | |
| // loads the contents of PORTC and PORTE to r16 and r17 | |
| lds r16, PORTC_IN | |
| lds r17, PORTE_IN | |
| // adds r17 to r16 | |
| add r16,r17 | |
| // conditionally turn on led if carry flag is set | |
| brcs turnLedOn | |
| setPORTR: | |
| // sets PORTR data direction to write | |
| sts PORTR_DIR, r31 | |
| // writes the contents of r16 to PORTR | |
| sts PORTR_OUT, r16 | |
| label: rjmp label | |
| turnLedOn: | |
| // sets PORTF data direction to write | |
| sts PORTF_DIR, r31 | |
| // turns led on | |
| sts PORTF_OUT, r31 | |
| rjmp setPORTR |
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