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serial.asm
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;;*************************************************************************************************
;;
;; 88 88
;; 88 ""
;; 88
;; 88,dPPPba, ,adPPPba, 8b, ,d8 ,adPPPPba, ,adPPPb,d8 ,adPPPba, 8b,dPPPba, 88 8b, ,d8
;; 88P' "88 a8P 88 `P8, ,8P' "" `P8 a8" `P88 a8" "8a 88P' `"88 88 `P8, ,8P'
;; 88 88 8PP""""""" )888( ,adPPPPP88 8b 88 8b d8 88 88 88 )888(
;; 88 88 "8b, ,aa ,d8" "8b, 88, ,88 "8a, ,d88 "8a, ,a8" 88 88 88 ,d8" "8b,
;; 88 88 `"Pbbd8"' 8P' `P8 `"8bbdP"P8 `"PbbdP"P8 `"PbbdP"' 88 88 88 8P' `P8
;; aa, ,88
;; "P8bbdP"
;;
;; Sistema Operacional Hexagonix - Hexagonix Operating System
;;
;; Copyright (c) 2015-2025 Felipe Miguel Nery Lunkes
;; Todos os direitos reservados - All rights reserved.
;;
;;*************************************************************************************************
;;
;; Português:
;;
;; O Hexagonix e seus componentes são licenciados sob licença BSD-3-Clause. Leia abaixo
;; a licença que governa este arquivo e verifique a licença de cada repositório para
;; obter mais informações sobre seus direitos e obrigações ao utilizar e reutilizar
;; o código deste ou de outros arquivos.
;;
;; English:
;;
;; Hexagonix and its components are licensed under a BSD-3-Clause license. Read below
;; the license that governs this file and check each repository's license for
;; obtain more information about your rights and obligations when using and reusing
;; the code of this or other files.
;;
;;*************************************************************************************************
;;
;; BSD 3-Clause License
;;
;; Copyright (c) 2015-2025, Felipe Miguel Nery Lunkes
;; All rights reserved.
;;
;; Redistribution and use in source and binary forms, with or without
;; modification, are permitted provided that the following conditions are met:
;;
;; 1. Redistributions of source code must retain the above copyright notice, this
;; list of conditions and the following disclaimer.
;;
;; 2. Redistributions in binary form must reproduce the above copyright notice,
;; this list of conditions and the following disclaimer in the documentation
;; and/or other materials provided with the distribution.
;;
;; 3. Neither the name of the copyright holder nor the names of its
;; contributors may be used to endorse or promote products derived from
;; this software without specific prior written permission.
;;
;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
;; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
;; DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
;; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
;; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
;; CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
;; OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
;; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;
;; $HexagonixOS$
HBoot.Serial.initSerialPort: ;; This method is used to initialize a serial port
mov ah, 0 ;; Moves the value 0 to the AH register
;; Function 0 is used to initialize the COM1 serial port
mov al, 0xE3 ;; Serial port parameters
mov dx, 0 ;; Port number (COM 1) - Serial Port 1
int 14h ;; Initialize port - activates the port to receive and send data
ret
;;************************************************************************************
HBoot.Serial.sendCOM1: ;; This method is used to transfer data over the open serial port
lodsb ;; Load the next character to be sent
or al, al ;; Compares the character with the end of the message
jz .done ;; If equal to end, jump to .done
mov ah, 01h ;; BIOS character sending function via serial port
int 14h ;; Calls the BIOS and performs the action
jc near .error
jmp HBoot.Serial.sendCOM1 ;; If it is not finished, return to the function and load the next character
.done: ;; If it's over...
ret ;; Returns the function that called it
.error:
stc
ret