70 lines
3.5 KiB
NASM
70 lines
3.5 KiB
NASM
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;-------------------------------------------------------------------------------
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; MSP430 Assembler Code Template for use with TI Code Composer Studio
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;
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;
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;-------------------------------------------------------------------------------
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.cdecls C,LIST,"msp430.h" ; Include device header file
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;-------------------------------------------------------------------------------
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.def RESET ; Export program entry-point to
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; make it known to linker.
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;-------------------------------------------------------------------------------
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.data
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myStr: .cstring "!#$%&()*+,-./:;<=>?@[\\]^_`{|}~" ; Define cstring variable
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symb_count: .int 0 ; counter variable
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.text ; Assemble into program memory.
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.retain ; Override ELF conditional linking
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; and retain current section.
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.retainrefs ; And retain any sections that have
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; references to current section.
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;-------------------------------------------------------------------------------
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RESET mov.w #__STACK_END,SP ; Initialize stackpointer
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StopWDT mov.w #WDTPW|WDTHOLD,&WDTCTL ; Stop watchdog timer
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;-------------------------------------------------------------------------------
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; Main loop here
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;-------------------------------------------------------------------------------
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main: mov.w #myStr, R4 ; Move the starting address of myStr into register 4
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clr.b R5 ; Register 5 will serve as a counter
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gnext: mov.b @R4+, R6 ; get a new character
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cmp.b #0, R6 ; check for null character
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jeq lend ; if null, go to end
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cmp.b #97, R6 ; check if 'a'
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jeq gnext ; if equal, get next character
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jge range2 ; if greater or equal, jump to range2
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jl capitals ; if less than, jump to numbers label
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range2: cmp.b #123, R6 ; is it '{' char
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jge incr ; if it is, jump to incr
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jl gnext ; if less than, get next character
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capitals: cmp.b #91, R6 ; is it '['
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jge incr ; if it is or greater, jump to incr
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cmp.b #65, R6 ; is it 'A'
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jge gnext ; if equal or greater, get next character
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cmp.b #58, R6 ; is it ';'
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jge incr ; if greater or equal, jump to incr
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cmp.b #48, R6 ; is it '0'
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jge gnext ; if equal or greater, get next character
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incr: inc.w R5 ; increment counter
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jmp gnext ; get next character
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lend: mov.w R5,&P1OUT ; Write result in P1OUT (not visible on port pins)
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bis.w #LPM4, SR ; LPM4
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nop ; Required only for debugger
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;-------------------------------------------------------------------------------
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; Stack Pointer definition
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;-------------------------------------------------------------------------------
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.global __STACK_END
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.sect .stack
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;-------------------------------------------------------------------------------
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; Interrupt Vectors
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;-------------------------------------------------------------------------------
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.sect ".reset" ; MSP430 RESET Vector
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.short RESET
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