penguin86/pato-z80-home-computer
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

hd44780 display debugger

Browse Source
This commit is contained in:
Daniele Verducci su MatissePenguin 2020-10-18 14:47:46 +02:00
parent 63974b148c
commit c833911cad
6 changed files with 61 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
.gitignore vendored Normal file
View File

@ -0,0 +1,2 @@
*.bin

34
arduino/hd44780_debugger/hd44780_debugger.ino Normal file
View File

@ -0,0 +1,34 @@
/* HD44780 Character display debugger */
#define EN 2
#define RS 11
const byte DATA_BUS[] = {10, 9, 8, 7, 6, 5, 4, 3};
void setup() {
pinMode(RS, INPUT);
pinMode(EN, INPUT);
for(int pin=0; pin < 8; pin++) {
pinMode(DATA_BUS[pin], INPUT);
}
Serial.begin(57600);
Serial.println("HD44780 debugger");
Serial.println("DATA BUS HEX RS EN");
attachInterrupt(digitalPinToInterrupt(EN), onClk, CHANGE);
}
void loop() {}
void onClk() {
unsigned int data = 0;
for(int pin=0; pin < 8; pin++) {
byte b = digitalRead(DATA_BUS[pin]) ? 1 : 0;
Serial.print(b);
data = (data << 1) + b; // Shifta di 1 e aggiunge il bit corrente. Serve per ricostruire il numero da binario
}
char output[30] = {};
sprintf(output, " 0x%02x %c %c", data, digitalRead(RS) ? 'D' : 'I', digitalRead(EN) ? 'H' : 'L');
Serial.println(output);
}

5
z80_debugger/z80_debugger.ino → arduino/z80_debugger/z80_debugger.ino
View File

@ -55,7 +55,8 @@ const byte MODE_ROM_EMULATOR = 1;
const byte MODE_ROM_RAM_EMULATOR = 2;
const byte ADDR_BUS[] = {50, 52, A11, A9, A8, A12, A15, A14, 53, 51, 49, 47, 45, 43, 41, 39};
const byte DATA_BUS[] = {34, 40, 42, 44, 46, 36, 30, 32};
//const byte DATA_BUS[] = {34, 40, 42, 44, 46, 36, 30, 32};
const byte DATA_BUS[] = {3, 4, 5, 6, 7, 8, 9,10};
//const byte CTRL_BUS_RD = 20;
const byte CTRL_BUS_RD = 3;
const byte CTRL_BUS_WR = 23;
@ -88,7 +89,7 @@ const byte PWR_VCC = 38;
* MODE_ROM_EMULATOR = Emulates rom with the contents of ROM_DATA
* MODE_ROM_RAM_EMULATOR = Emulates ram
*/
const byte MODE = MODE_ROM_EMULATOR;
const byte MODE = MODE_DEBUGGER;
const byte ROM_DATA[] = {0x00, 0x00, 0x00, 0x00, 0xC3, 0x00, 0x00};
//const byte ROM_DATA[] = {0x00, 0x00, 0x00, 0x00, 0x76, 0x00, 0x00};

7
assembly/README.txt Normal file
View File

@ -0,0 +1,7 @@
Compilare assembly:
z80asm -i hd44780_lcd_test_procedure.asm -o rom.bin
Portare binario alla dimensione dell eeprom:
dd if=/dev/zero of=rom.bin bs=1 count=0 seek=8192
Scrivere su EEPROM:
minipro -w rom.bin -p "AT28C64B"

BIN
assembly/a.bin
View File

Binary file not shown.

31
assembly/hd44780_lcd_test_procedure.asm
View File

@ -1,40 +1,39 @@
;hd44780 lcd test procedure
ld hl,$4000 ;address reg points to lcd instruction address
LCD_INSTR_REG: EQU %00000000
LCD_DATA_REG: EQU %00000001
;reset procedure
ld a,%00111000
ld (hl),a
out (LCD_INSTR_REG),a
ld a,%00001000
ld (hl),a
out (LCD_INSTR_REG),a
ld a,%00000001
ld (hl),a
out (LCD_INSTR_REG),a
;init procedure
ld a,%00111000
ld (hl),a
out (LCD_INSTR_REG),a
ld a,%00001110
ld (hl),a
out (LCD_INSTR_REG),a
;write characters to display
ld hl,$4001 ;address reg points to lcd data address
ld a,%01000100
ld (hl),a
out (LCD_DATA_REG),a
ld a,%01100001
ld (hl),a
out (LCD_DATA_REG),a
ld a,%01101110
ld (hl),a
out (LCD_DATA_REG),a
ld a,%01101001
ld (hl),a
out (LCD_DATA_REG),a
ld a,%01100101
ld (hl),a
out (LCD_DATA_REG),a
ld a,%01101100
ld (hl),a
out (LCD_DATA_REG),a
ld a,%01100101
ld (hl),a
out (LCD_DATA_REG),a
ld a,%00100001
ld (hl),a
out (LCD_DATA_REG),a
halt