#include <p16f88.inc>
;Program Configuration Register 1
__CONFIG _CONFIG1, _CP_OFF & _CCP1_RB0 & _DEBUG_OFF & _WRT_PROTECT_OFF & _CPD_OFF & _LVP_OFF & _BODEN_ON & _MCLR_ON & _PWRTE_ON & _WDT_OFF & _INTRC_IO
;Program Configuration Register 2
__CONFIG _CONFIG2, _IESO_OFF & _FCMEN_OFF
#define T0IF TMR0IF
#define T0IE TMR0IE
endif
ifdef __16F628A
#include <p16f628A.inc> ; Standard include file
; defines processor specific variable definitions
; See MPASM UG Section 4.41
;------------------------------------------------------------------------------------
; '__CONFIG' directive is used to embed configuration data within .asm file.
; The lables following the directive are located in the respective .inc file.
; See respective data sheet for additional information on configuration word.
; and also see MPASM UG Section 4.12
__CONFIG _CP_OFF & _WDT_ON & _PWRTE_ON & _INTRC_OSC_NOCLKOUT & _LVP_OFF
endif
ifdef __16F628
#include <p16f628.inc>
__CONFIG _CP_OFF & _WDT_ON & _PWRTE_ON & _INTRC_OSC_NOCLKOUT & _LVP_OFF
endif
ifdef __16F84A
; **** 16F84A only has 1K of program memory - the default pwm_SeqData.inc file ****
; **** will not fit into the available memory, you must remove some of the ****
; **** the sequence data from the file before assembling the code ****
#include <p16f84a.inc>
__CONFIG _CP_OFF & _WDT_ON & _PWRTE_ON & _HS_OSC
; Code protect off
; Watch Dog timer off
; Power-up timer delay on
; change to _RC_OSC for resistor/capacitor
; change to _XT_OSC for crystal/resonator <3.5Mhz
; change to _HS_OSC for high speed crystal/resonator >3.5Mhz
endif
;------------------------------------------------------------------------------------
; Suppress specific warning messages
; see MPASM UG Section 4.29 for errorlevel directive
; see MPASM UG Section 8.4 for assembler message descriptions
;
errorlevel -302 ; suppress banksel warning messages during assembly
;------------------------------------------------------------------------------------
; define variables in General Purpose Register (GPR) memory
; See MPASM UG Section 4.8
; note: 16F84A GPR start at 0x0C but most other mid-range PICs start at 0x20
; We use 0x20 here for compatibilty with newer PICs
cblock 0x20
firstGPR:0 ; mark start of GPR memory used
state ; used by function state selector
copyPORTB ; working variable, holds copy of PORTB
vc0,vc1,vc2,vc3,vc4 ; vertical counter bits
hiReload ; vertical counter reload hi
loReload ; vertical counter reload lo
pwm ; pwm counter
holdTime ; sequence line hold time
repeatCount 3
; repeat seqeunce count
RandMask ; mask to AND random number with
seqIdxLo ; Lo byte address index pointer to start of selected sequence
seqIdxHi ; Hi byte address index pointer to start of selected sequence
seqTotal ; Total number of sequences in data
seqMatch ; working variable
seqCount ; working variable
forward ; working regsiter for mirroring data
reverse ; working regsiter for mirroring data
reloadTemp ; temporary holding variable for loReload
tick ; timer0 ticks
swTimer ; switch hold down timer
flags ; function flags register
mode ; mode flags register
indexLo ; Lo byte sequence line data address pointer
indexHi ; Hi byte sequence line data address pointer
save_W ; save W during interupt
save_Status ; save STATUS during interupt
save_PCLATH ; save PCLATH
saveModeTimerL ; holdoff timer for saving opmode to EEPROM high
saveModeTimerH ; holdoff timer for saving opmode to EEPROM low
eesave_W ; temp register used in EEPROM routings
LFSRH ; Random number shift regsiter high byte
LFSRL:0 ; Random number shift register low byte
lastGPR ; mark last GPR register used
; (required by GPR initialisation code)
endc
Write, Run & Share Assembly code online using OneCompiler's Assembly online compiler for free. It's one of the robust, feature-rich online compilers for Assembly language. Getting started with the OneCompiler's Assembly compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as Assembly and start coding.
Assembly language(asm) is a low-level programming language, where the language instructions will be more similar to machine code instructions.
Every assembler may have it's own assembly language designed for a specific computers or an operating system.
Assembly language requires less execution time and memory. It is more helful for direct hardware manipulation, real-time critical applications. It is used in device drivers, low-level embedded systems etc.
Assembly language usually consists of three sections,
Data section
To initialize variables and constants, buffer size these values doesn't change at runtime.
bss section
To declare variables
text section
_start specifies the starting of this section where the actually code is written.
There are various define directives to allocate space for variables for both initialized and uninitialized data.
variable-name define-directive initial-value
| Define Directive | Description | Allocated Space |
|---|---|---|
| DB | Define Byte | 1 byte |
| DW | Define Word | 2 bytes |
| DD | Define Doubleword | 4 bytes |
| DQ | Define Quadword | 8 bytes |
| DT | Define Ten Bytes | 10 bytes |
| Define Directive | Description |
|---|---|
| RESB | Reserve a Byte |
| RESW | Reserve a Word |
| RESD | Reserve a Doubleword |
| RESQ | Reserve a Quadword |
| REST | Reserve a Ten Bytes |
Constants can be defined using
CONSTANT_NAME EQU regular-exp or value
%assign constant_name value
%define constant_name value
Loops are used to iterate a set of statements for a specific number of times.
mov ECX,n
L1:
;<loop body>
loop L1
where n specifies the no of times loops should iterate.
Procedure is a sub-routine which contains set of statements. Usually procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
procedure_name:
;procedure body
ret