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en:pfw:assemblers_msp430-assembler [2023-09-04 18:10] – gelöscht - Externe Bearbeitung (Unbekanntes Datum) 127.0.0.1en:pfw:assemblers_msp430-assembler [2023-09-05 06:33] (current) – ↷ Links angepasst, weil Seiten im Wiki verschoben wurden 157.90.7.32
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 +{{pfw:banner.png}}
 +====== Assembler for MSP430 ======
  
 +===== The idea: =====
 +
 +A compact universal MSP430 assembler
 +
 +===== Implementation =====
 +
 +The example asumes a 16-bit machine and compile actions. Also a Flash environment is assumed, for RAM only systems ''%%ROM!%%'' can be replaced by ''%%!%%'' and ''%%CHERE%%'' by ''%%HERE%%''. Examples of macros are in the source file. An implementation example for ''%%CODE%%'' and ''%%END-CODE%%'' is showed too. Missing words in Generic Forth are:
 +
 +<code forth>
 +CHERE ROM! ?ABORT
 +
 +: CHERE  ( -- a )    Leave flash or FRAM address on the stack ; 
 +: {W     ( -- )      enable write access to flash or FRAM ;
 +: W}     ( -- )      disable write access to flash or FRAM ;
 +: ROM!   ( x -- )    {W  !  W} ;       \ Store 'x' in flash or FRAM
 +: ?ABORT ( f -- )    if  abort  then ;  \ Replace noForth style compact error message
 +</code>
 +
 +**27 instructions (16b, .B = 8b)**
 +
 +<code>
 +✦ 6 instructions with 1 operand
 +   RRA RRC SWPB SXT PUSH CALL
 +  
 +✦ 12 instructions with 2 operands
 +   MOV CMP ADD SUB ADDC SUBC DADD
 +   BIT BIS BIC BIA (AND) BIX (XOR)
 +  
 +✦ 8 jump instructions with relative inline addresses
 +   JNZ JZ JNC JC JN JGE JL JMP
 +  
 +✦ return from interrupt
 +   RETI
 +</code>
 +
 +Example of it's use:
 +
 +<code forth>
 +code LSHIFT ( x1 n -- x2 )
 +  tos w mov
 +  sp )+ tos mov
 +  #0 w cmp  <>? if, 
 +    begin, 
 +      tos tos add
 +      #1 w sub
 +  =? until,
 +then, 
 +next  end-code
 +</code>
 +
 +<code></code>
 +| File name | Commands | Purpose | on Github (external link) |
 +| [[pfw:system_software:msp430-assembler-doc.pdf]] | DEMO2 | Documentation | [[https://github.com/project-forth-works/project-forth-works/blob/main/System-Software/Assemblers/MSP430-assembler/MSP430-assembler-doc.pdf|Assembler documentation]] |
 +| [[pfw:system_software:msp430-asm-v0.2.f]] | DEMO3 | universal MSP430 assembler | [[https://github.com/project-forth-works/project-forth-works/blob/main/System-Software/Assemblers/MSP430-assembler/MSP430-asm-v0.2.f|MSP430 assembler]] |
 +
 +==== Contributions ====
 +
 +<html><h2 style="background-color:yellow">Alternative Implementations</h2></html>
 +
 +
 +[[en:pfw:welcome|Back to PFW page]]