BobBurns

;demo program to learn how the avr can talk to another device with SPI
;in this case the 25LC256 eeprom
;
;based on the example code in c from Elliot Williams AVR Programming
;this example writes a string to the eeprom and then read it into sram to be sent over USART
;
;compile with gavrasm SPI-hello_eeprom.asm
;flash with avrdude -c avrisp -p m168 -P /dev/tty.useyourmodem -b 19200 -U flash:w:SPI-hello_eeprom.hex
;
;there are a couple extra convenience routines to use later

BobBurns

;
;reaction timer program from AVR programming
;button on PD2  // leds on PORTB
;
.equ UBBRvalue = 12
.equ UCSR0C = 0xc2      ;SRAM address of UCSR0C
.def temp = r16 
.def count = r17 
.def temp2 = r18 
.def xL = r26           ;x reg used as global counter

BobBurns

;Capacitive sensor demo in avr assembly
;compile with gavrasm capSense.asm
;flash with avrdude -c avrisp -p m168 -P /dev/tty.usbmodem1411 -b 19200 -U flash:w:capSense.hex
;
;
;what I learned from this program:
; always save the status reg when using interrupts
; and use the right jump vector for interrupt calls
; and keep track of registers used in subroutines
;

BobBurns

;Interrupt 0 Example
; Flashes LED0 at a fixed rate, interrupting whenever button is pressed
;
.device atmega 168 
.def temp = r16 
.def temp2 = r17 
.org 0
;
;Interrupt Vector Table
        jmp     reset

BobBurns

;Night Light program from p.148
;
;example program using adc, mux, and sram variable storage
;
;compile with gavrasm serial_assembly.asm
;flash with avrdude -c avrisp -p m168 -P /dev/tty.usbmodem1411 -b 19200 -U flash:w:serial_assembly.hex
;
;program to utilize adc mux
.device atmega 168
        rjmp    start

BobBurns

;Light Meter assembly version
;based on E.Williams AVR Programming lightSensor.c p.135
;compile with gavrasm lightMeter.asm
;
.device atmega 168 
.cseg
.org 0
.def temp = r16 
;--- Inits ---
        ldi     temp,0xff

BobBurns

;example program using debouncing
;from AVR Programming by Elliot Williams p.115
;
;compile with gavrasm debouncer.asm
;flash with avrdude -c avrisp -p m168 -P /dev/tty.usbmodem1411 -b 19200 -U flash:w:debouncer.hex
;
.def temp = r16 
.device atmega168
;--- inits ---
.def b_pressed = r17 

BobBurns

;Serial Organ program p.100
;compile with gavrasm organAssembly.asm
;flash with avrdude -c avrisp -p m168 -P /dev/tty.usbmodem1411 -b 19200 -U flash:w:organAssembly.hex;
;USART configure: 2x 1Mhz clock speed, 9600 baud UBBR = 12
.equ UBBRvalue = 12
.def temp = r16
.def zL = r30 
.def zH = r31           ;not defined
.def byte_tx = r18          
.def inB = r20

BobBurns

;serial io echo program from AVR Programming p.81 by Elliot Williams
;help from T. Margush Some Assembly Required
;compile with gavrasm serial_assembly.asm
;flash with avrdude -c avrisp -p m168 -P /dev/tty.usbmodem1411 -b 19200 -U flash:w:serial_assembly.hex
;
; cpu_f = 1,000,000 baud = 9600 use 2x(USX0 = 1)
;Programmer: Me
;2 mhz clock speed, 9600 baud UBBR = 12
.equ UBBRvalue = 12
.equ UCSR0C = 0xc2  ; SRAM address of UCSR0C

BobBurns

;serial io echo program from AVR Programming p.81 by Elliot Williams
;help from T. Margush Some Assembly Required
;compile with gavrasm serial_assembly.asm
;flash with avrdude -c avrisp -p m168 -P /dev/tty.XXXXXXX -b 19200 -U flash:w:serial_assembly.hex
;
; cpu_f = 1,000,000 baud = 9600 use 2x(USX0 = 1)
;Programmer: Me
;2 mhz clock speed, 9600 baud UBBR = 12
.equ UBBRvalue = 12
.equ UCSR0C = 0xc2  ; SRAM address of UCSR0C