From 30ec4f2975b0baf17c7a79003287dd99f10f8f5a Mon Sep 17 00:00:00 2001
From: "Daniele Verducci (ZenPenguin)" <danieleverducci@gmail.com>
Date: Sun, 22 Nov 2020 23:01:22 +0100
Subject: [PATCH] Added Arduino terminal, moved drivers config variables to
 each driver asm file

---
 assembly/bios/driver_arduino_terminal.asm | 23 +++++++++++++++++++++++
 assembly/bios/driver_hd44780.asm          |  8 ++++----
 assembly/bios/driver_keyboard.asm         |  6 ++++++
 assembly/bios/main.asm                    | 13 ++-----------
 4 files changed, 35 insertions(+), 15 deletions(-)
 create mode 100644 assembly/bios/driver_arduino_terminal.asm

diff --git a/assembly/bios/driver_arduino_terminal.asm b/assembly/bios/driver_arduino_terminal.asm
new file mode 100644
index 0000000..7a6f510
--- /dev/null
+++ b/assembly/bios/driver_arduino_terminal.asm
@@ -0,0 +1,23 @@
+; Arduino terminal driver
+; @author Daniele Verducci
+
+; config (IO port 0)
+DATA_REG: EQU IO_0
+
+; functions
+
+; Sends string
+; @param BC Pointer to a null-terminated string first character
+Term_print:
+    ld a, (bc)  ; bc is the pointer to passed string's first char
+    cp 0        ; compare A content with 0 (subtract 0 from value and set zero flag Z if result is 0)
+    ret z       ; if prev compare is true (Z flag set), string is finished, return
+    out (DATA_REG),a    ; output char
+    inc bc ; increment bc to move to next char
+    jp Term_print
+
+; Writes a single character
+; @param A Value of character to print
+Term_printc:
+    out (DATA_REG),a
+    ret
diff --git a/assembly/bios/driver_hd44780.asm b/assembly/bios/driver_hd44780.asm
index 7485c46..8b22530 100644
--- a/assembly/bios/driver_hd44780.asm
+++ b/assembly/bios/driver_hd44780.asm
@@ -1,9 +1,9 @@
 ; HD44780 20x4 characters LCD display driver
 ; @author Daniele Verducci
-;
-; Requires declaration of following pointers:
-; LCD_INSTR_REG
-; LCD_DATA_REG
+
+; LCD config (IO port 0)
+LCD_INSTR_REG: EQU IO_0
+LCD_DATA_REG: EQU IO_0 + 1
 
 ; constants
 LCD_LINES_LEFT: DB 0x80, 0xA8, 0x94, 0xBC  ;array defining lcd command codes for the first char of every line
diff --git a/assembly/bios/driver_keyboard.asm b/assembly/bios/driver_keyboard.asm
index f3c0340..2b0aac9 100644
--- a/assembly/bios/driver_keyboard.asm
+++ b/assembly/bios/driver_keyboard.asm
@@ -23,6 +23,12 @@
 ; KEYB_A3_REG = 0000011
 ; etc...
 
+; Keyboard config (IO port 1)
+KEYB_A0_REG: EQU IO_1 + %00000001
+KEYB_A1_REG: EQU IO_1 + %00000010
+KEYB_A2_REG: EQU IO_1 + %00000100
+KEYB_A3_REG: EQU IO_1 + %00001000
+KEYB_A4_REG: EQU IO_1 + %00010000
 
 ; Reads the keyboard
 ; @return: a 0-terminated array of keycodes representing the pressed keys
diff --git a/assembly/bios/main.asm b/assembly/bios/main.asm
index c0b7622..db1b42c 100644
--- a/assembly/bios/main.asm
+++ b/assembly/bios/main.asm
@@ -35,16 +35,6 @@ IO_5: EQU 0xA0
 IO_6: EQU 0xC0
 IO_7: EQU 0xE0
 
-; LCD config (IO port 0)
-LCD_INSTR_REG: EQU IO_0
-LCD_DATA_REG: EQU IO_0 + 1
-
-; Keyboard config (IO port 1)
-KEYB_A0_REG: EQU IO_1 + %00000001
-KEYB_A1_REG: EQU IO_1 + %00000010
-KEYB_A2_REG: EQU IO_1 + %00000100
-KEYB_A3_REG: EQU IO_1 + %00001000
-KEYB_A4_REG: EQU IO_1 + %00010000
 
 
 ; CONSTANTS
@@ -55,8 +45,9 @@ SYSINIT_GREETING:
 
 
 
-include 'driver_hd44780.asm'
+;include 'driver_hd44780.asm'
 ;include 'driver_keyboard.asm'
+include 'driver_arduino_terminal.asm'
 
 ; System initialization
 Sysinit: