mirror of
https://github.com/sergeyyarkov/attiny2313a_thermostat.git
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172 lines
5.5 KiB
NASM
172 lines
5.5 KiB
NASM
;
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; Project name: thermostat
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; Description: Electronic thermostat on AVR Microcontroller
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; Source code: https://github.com/sergeyyarkov/attiny2313a_thermostat
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; Device: ATtiny2313A
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; Device Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/doc8246.pdf
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; Package: SOIC-20W_7.5x12.8mm_P1.27mm
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; Assembler: AVR macro assembler 2.2.7
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; Clock frequency: 8 MHz External Crystal Oscillator
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; Fuses: lfuse: 0xCF, hfuse: 0x9F, efuse: 0xFF, lock: 0xFF
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;
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; Written by Sergey Yarkov 22.01.2023
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.INCLUDE "tn2313Adef.inc"
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.LIST
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.DEF TEMP_REG_A = r16
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.DEF TEMP_REG_B = r17
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.DEF COUNTER = r20
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;========================================;
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; LABELS ;
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;========================================;
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.EQU LED_POWER_PORT = PD6
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.EQU USI_LATCH_PIN = PB0 ; ST_CP on 74HC595
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.EQU USI_DO_PIN = PB6 ; DS on 74HC595
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.EQU USI_CLK_PIN = PB7 ; SH_CP on 74HC595
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;========================================;
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; CODE SEGMENT ;
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;========================================;
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.CSEG
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.ORG 0x00
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;========================================;
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; VECTORS ;
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;========================================;
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rjmp RESET_vect ; Program start at RESET vector
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;reti ; External Interrupt Request 0 / inactive
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;reti ; External Interrupt Request 1 / inactive
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;reti ; Timer/Counter1 Capture Event / inactive
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;reti ; Timer/Counter1 Compare Match A / inactive
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;reti ; Timer/Counter1 Overflow / inactive
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;reti ; Timer/Counter0 Overflow / inactive
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;reti ; USART0, Rx Complete / inactive
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;reti ; USART0 Data Register Empty / inactive
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;reti ; USART0, Tx Complete / inactive
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;reti ; Analog Comparator / inactive
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;reti ; Pin Change Interrupt Request 0/ inactive
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;reti ; Timer/Counter1 Compare Match B / inactive
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;reti ; Timer/Counter0 Compare Match A / inactive
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;reti ; Timer/Counter0 Compare Match B / inactive
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;reti ; USI Start Condition/ inactive
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;reti ; USI Overflow / inactive
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;reti ; EEPROM Ready/ inactive
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;reti ; Watchdog Timer Overflow / inactive
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;reti ; Pin Change Interrupt Request 1 / inactive
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;reti ; Pin Change Interrupt Request 2 / inactive
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RESET_vect:
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;========================================;
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; INITIALIZE STACK POINTER ;
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;========================================;
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ldi TEMP_REG_A, low(RAMEND)
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out SPL, TEMP_REG_A
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MCU_INIT:
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;=======================================================
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; POWER LED <------------> PD6 ;
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; - This LED is used to indicate that device ;
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; is working correctly ;
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; ;
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;=======================================================
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rcall INIT_PORTS
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ldi COUNTER, 0b00000001
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rjmp LOOP
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INIT_PORTS:
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ldi r16, (1<<LED_POWER_PORT)
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out DDRD, r16
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ldi r16, (1<<USI_CLK_PIN) | (1<<USI_DO_PIN) | (1<<USI_LATCH_PIN)
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out DDRB, r16
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ret
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;========================================;
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; SEND BYTE TO 74HC595 ;
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;========================================;
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USI_TRANSMIT:
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mov r19, COUNTER
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out USIDR, r19 ; Move byte into USI Data Register
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; Enable USI Overflow Interrupt Flag (will be 0 if transfer is not compeleted)
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ldi r19, (1<<USIOIF)
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out USISR, r19
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; Load settings of USI into temp register
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; This will setup USI to Three-wire mode, Software clock strobe (USITC)
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; with External, positive edge and toggle USCK
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;
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; USIWM0 <--------------> USI Wire Mode
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; USICS1 <--------------> USI Clock Source Select
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; USICLK <--------------> USI Clock Strobe
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; USITC <--------------> USI Toggle Clock (Enable clock generation)
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ldi TEMP_REG_A, (1<<USIWM0) | (1<<USICS1) | (1<<USICLK) | (1<<USITC)
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_USI_TRANSMIT_LOOP:
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out USICR, TEMP_REG_A ; Load settings from temp register into USI Control Register
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sbis USISR, USIOIF ; If transfer is comleted then move out of loop
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rjmp _USI_TRANSMIT_LOOP
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; Send pulse into LATCH pin.
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; This will copy byte from 74hc595 shift register into 74hc595 storage register
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sbi PORTB, USI_LATCH_PIN
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cbi PORTB, USI_LATCH_PIN
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ret
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SUBPROGRAM_LED_SHIFTING:
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rcall USI_TRANSMIT
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rol COUNTER
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ret
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;========================================;
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; MAIN PROGRAM LOOP ;
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;========================================;
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LOOP:
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rcall TOGGLE_POWER_LED
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rcall SUBPROGRAM_LED_SHIFTING
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rcall DELAY
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rcall DELAY
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rjmp LOOP
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DELAY:
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push r16
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push r17
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cli
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ldi r16, 255
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_DELAY_1:
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ldi r17, 255
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_DELAY_2:
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dec r17
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nop
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nop
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nop
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brne _DELAY_2
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dec r16
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brne _DELAY_1
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sei
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pop r17
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pop r16
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ret
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TOGGLE_POWER_LED:
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ldi r16, (1<<LED_POWER_PORT)
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in r17, PORTD
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eor r17, r16
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out PORTD, r17
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ret
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;========================================;
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; EEPROM SEGMENT ;
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;========================================;
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.ESEG
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INFO: .DB "AVR Thermostat. Written by Sergey Yarkov 22.01.2023" |