setup ports

.gitignore

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+.vscode
+firmware.asm~
+firmware.pro
+firmware.lst

Makefile

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+SRCFILE = firmware
+ 
+compile: $(SRCFILE).asm
+	gavrasm $(SRCFILE)
+ 
+clean:
+	rm -f $(SRCFILE).asm~ $(SRCFILE).hex $(SRCFILE).obj $(SRCFILE).lst $(SRCFILE).cof

README.md

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+##led-blink-example

firmware.asm

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+; Project name: led-blink-example
+; Description: Blink an led every one second
+; Source code: https://github.com/sergeyyarkov/attiny24a_led-blink-example
+; Device: ATtiny24A
+; Package: 14-pin-PDIP/SOIC
+; Assembler: gavrasm v5.0
+;
+; Written by Sergey Yarkov 23.09.2021
+
+.device ATtiny24A
+.list                       ; Enable listing
+
+.macro init_stack_p         ; Setup stack pointer
+  ldi @0, low(@1),
+  out SPL, @0
+.endm
+
+.equ LED_DIR = DDRA         ; LED Direction
+.equ LED_PORT = PORTA       ; LED Port
+.equ LED_PIN = PINA0        ; LED Pin
+
+.equ delay_cycles = 250 
+
+.org 0x00                   ; Start program at 0x00
+.cseg                       ; Code segment
+
+ldi r17, delay_cycles
+ldi r18, delay_cycles
+ldi r19, delay_cycles
+
+main:                       ; Start up program
+  init_stack_p r16, RAMEND
+  rcall init_ports          ; Initialize MCU ports
+
+loop:                       ; Program loop
+  rjmp loop
+
+init_ports:                 ; Init MCU ports
+  ldi r16, (1<<LED_PIN)
+  ldi r17, (0<<LED_PIN)
+  nop
+  out LED_DIR, r16
+  out LED_PORT, r17
+ret

firmware.hex

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+:020000020000FC
+:100000001AEF2AEF3AEF0FED0DBF01D0FFCF01E05D
+:0A00100010E000000ABB1BBB0895BE
+:00000001FF