111 lines
3.4 KiB
NASM
111 lines
3.4 KiB
NASM
# riscv assembly raspberry pico2 rp2350
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# program lenstring.s
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# connexion putty com3
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/*********************************************/
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/* CONSTANTES */
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/********************************************/
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/* for this file see risc-v task include a file */
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.include "../../constantesRiscv.inc"
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.equ BUFFERSIZE, 255
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/*******************************************/
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/* INITIALED DATAS */
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/*******************************************/
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.data
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szMessStart: .asciz "Program riscv start.\r\n"
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szMessEndOk: .asciz "Program riscv end OK.\r\n"
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szCariageReturn: .asciz "\r\n"
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szMessLenString: .asciz "The lenght of string "
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szMessLenString1: .asciz " is "
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szString1: .asciz "Apple"
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szString2: .asciz "Orange"
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.align 2
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/*******************************************/
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/* UNINITIALED DATA */
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/*******************************************/
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.bss
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sConvArea: .skip 24
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.align 2
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/**********************************************/
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/* SECTION CODE */
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/**********************************************/
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.text
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.global main
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main:
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call stdio_init_all # général init
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1: # start loop connexion
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li a0,0 # raz argument register
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call tud_cdc_n_connected # waiting for USB connection
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beqz a0,1b # return code = zero ?
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la a0,szMessStart # message address
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call writeString # display message
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la s0,szString1 # adresse string 1
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mv a0,s0
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call stringlength # len string
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la a1,sConvArea
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call conversion10 # call decimal conversion
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la a0,szMessLenString
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call writeString
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mv a0,s0
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call writeString
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la a0,szMessLenString1
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call writeString
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la a0,sConvArea # display result message
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call writeString
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la a0,szCariageReturn
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call writeString
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la s0,szString2 # adresse string 2
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mv a0,s0
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call stringlength # len string
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la a1,sConvArea
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call conversion10 # call decimal conversion
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la a0,szMessLenString
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call writeString
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mv a0,s0
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call writeString
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la a0,szMessLenString1
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call writeString
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la a0,sConvArea # display result message
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call writeString
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la a0,szCariageReturn
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call writeString
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la a0,szMessEndOk # message address
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call writeString # display message
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call getchar
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100: # final loop
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j 100b
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/***************************************************/
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/* compute string length */
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/***************************************************/
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# a0 contains string e
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# a0 return length
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stringlength:
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addi sp, sp, -4 # reserve stack
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sw ra, 0(sp) # save registers @ save registers
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li t1,-1 # init counter
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1: # loop
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addi t1,t1,1 # increment counter
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add t0,a0,t1 # compute byte address
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lbu t2,(t0) # load byte string
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bnez t2,1b # zero final ?
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mv a0,t1 #return length
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100:
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lw ra, 0(sp)
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addi sp, sp, 4
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ret
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/************************************/
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/* file include Fonctions */
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/***********************************/
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/* for this file see risc-v task include a file */
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.include "../../includeFunctions.s"
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