mirror of
https://github.com/sergeyyarkov/attiny26l_push-to-toggle.git
synced 2026-10-11 02:08:54 +03:00
156 lines
2.7 KiB
NASM
156 lines
2.7 KiB
NASM
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; Project name: attiny26l_push-to-toggle
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; Description: Example how to turn a push button into toggle button
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; Source code: https://github.com/sergeyyarkov/attiny26l_push-to-toggle
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; Device: ATtiny26L
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; Assembler: AVR macro assembler 2.2.7
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; Clock frequency: 1MHz
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; Fuses: lfuse: 0xD1, hfuse: 0xF7, efuse: 0xFF, lock: 0xFF
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;
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; Written by Sergey Yarkov 09.06.2023
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.INCLUDE "tn26def.inc"
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.LIST
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; **** REGISTERS *************************************************
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.DEF PC_HISTORY = r19
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; **** LABLES ****************************************************
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.EQU LED_PORT = PORTA
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.EQU LED_PIN = PINA
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.EQU LED_0_PIN = PA7
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.EQU LED_1_PIN = PA6
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.EQU LED_2_PIN = PA5
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.EQU SW_PORT = PORTA
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.EQU SW_PIN = PINA
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.EQU SW_0_PIN = PA4
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.EQU SW_1_PIN = PA3
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.EQU SW_2_PIN = PA2
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; **** CODE SEGMENT **********************************************
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.CSEG
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; **** VECTORS ***************************************************
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.ORG 0x00
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rjmp RESET_vect
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.ORG 0x02
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rjmp PIN_CHANGE_vect
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PIN_CHANGE_vect:
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push r16
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push r17
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in r17, SREG
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in r18, PINA
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eor r18, PC_HISTORY
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in PC_HISTORY, PINA
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_sw_0_check:
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sbrs r18, SW_0_PIN
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rjmp _sw_1_check
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rjmp _sw_0_handler
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_sw_0_handler:
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rcall DEBOUNCE_SW
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ldi r16, LED_0_PIN
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sbis SW_PIN, SW_0_PIN
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rcall TOGGLE_LED
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rjmp _sw_exit
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_sw_1_check:
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sbrs r18, SW_1_PIN
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rjmp _sw_2_check
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rjmp _sw_1_handler
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_sw_1_handler:
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rcall DEBOUNCE_SW
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ldi r16, LED_1_PIN
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sbis SW_PIN, SW_1_PIN
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rcall TOGGLE_LED
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rjmp _sw_exit
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_sw_2_check:
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sbrs r18, SW_2_PIN
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rjmp _sw_exit
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_sw_2_handler:
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rcall DEBOUNCE_SW
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ldi r16, LED_2_PIN
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sbis SW_PIN, SW_2_PIN
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rcall TOGGLE_LED
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_sw_exit:
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out SREG, r17
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pop r17
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pop r16
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reti
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RESET_vect:
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ldi r16, RAMEND
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out SP, r16
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MCU_INIT:
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ldi r16, (1<<LED_0_PIN) | (1<<LED_1_PIN) | (1<<LED_2_PIN) | (0<<SW_0_PIN) | (0<<SW_1_PIN) | (0<<SW_2_PIN)
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out DDRA, r16
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ldi r16, (1<<SW_0_PIN) | (1<<SW_1_PIN) | (1<<SW_2_PIN)
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out PORTA, r16
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ldi r16, (1<<PCIE0)
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out GIMSK, r16
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ldi PC_HISTORY, 0xff
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sei
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LOOP:
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nop
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rjmp LOOP
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DEBOUNCE_SW: ; FOR 1 MHz
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push r16
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push r17
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ldi r17, 255
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_loop_0:
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ldi r16, 150
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_dec_0:
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dec r16
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brne _dec_0
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_loop_1:
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dec r17
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brne _loop_0
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pop r17
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pop r16
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ret
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TOGGLE_LED:
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push r16
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push r17
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push r18
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in r17, PINA
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mov r18, r16
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ldi r16, 0x01
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_toggle_led_shift:
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lsl r16
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dec r18
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brne _toggle_led_shift
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eor r17, r16
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out PORTA, r17
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pop r18
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pop r17
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pop r16
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ret |