Apple-1-HW/RC6502-Apple-1-Replica
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Non-functional version of serial communications

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Unknown 2017-05-29 22:19:38 +02:00
parent 995945b217
commit ac3dd4da15
2 changed files with 126 additions and 6 deletions
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15
RC6502 Serial IO/RC6502 Serial IO.sch
View File

@ -217,7 +217,7 @@ NoConn ~ 3900 4150
Text GLabel 2650 2850 0 60 Input ~ 0
VCC
Text GLabel 3950 950 2 60 Input ~ 0
KBD_DA
KBD_STROBE
Text GLabel 3950 1050 2 60 Output ~ 0
KBD_READY
NoConn ~ 3950 1150
@ -302,8 +302,6 @@ F 3 "" H 5950 2800 50 0001 C CNN
1 5700 1800
1 0 0 -1
$EndComp
Text GLabel 2650 1750 0 60 Output ~ 0
KBD_D7
Text GLabel 5200 1900 0 60 Input ~ 0
OUT_D0
Text GLabel 5200 2000 0 60 Input ~ 0
@ -463,12 +461,10 @@ Wire Wire Line
8350 1450 8350 1300
Wire Wire Line
8350 1300 8100 1300
Text GLabel 5200 2600 0 60 Output ~ 0
OUT_D7
Text GLabel 7400 1400 0 60 Input ~ 0
KBD_READY
Text GLabel 7400 1600 0 60 Output ~ 0
KBD_DA
KBD_STROBE
Text GLabel 7400 1700 0 60 Output ~ 0
OUT_READY
Text GLabel 7400 1500 0 60 Input ~ 0
@ -617,4 +613,11 @@ NoConn ~ 7400 1200
NoConn ~ 7400 1100
NoConn ~ 7400 1000
NoConn ~ 7400 1300
NoConn ~ 5200 2600
Text GLabel 2025 1600 1 60 Input ~ 0
VCC
Wire Wire Line
2025 1600 2025 1750
Wire Wire Line
2025 1750 2650 1750
$EndSCHEMATC

117
RC6502 Serial IO/pia_bridge/pia_bridge.ino Normal file
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@ -0,0 +1,117 @@
#include <SPI.h>
#include <MCP23S17.h>
#define IO_SS 10
#define IO_KBD_D0 8
#define IO_KBD_D6 14
#define IO_KBD_DA 15
#define IO_VIDEO_D0 0
#define IO_VIDEO_D6 6
#define IO_VIDEO_DA 7
#define KBD_READY 2
#define KBD_STROBE 4
#define VIDEO_RDA 5
#define VIDEO_DA 3
MCP23S17 bridge(&SPI, IO_SS, 0);
void setup() {
Serial.begin(115200);
Serial.println("Initializing...");
configure_pins();
configure_bridge();
Serial.println("Initialization done!");
}
void configure_pins() {
pinMode(KBD_READY, INPUT);
pinMode(VIDEO_DA, INPUT);
pinMode(KBD_STROBE, OUTPUT);
pinMode(VIDEO_RDA, OUTPUT);
}
void configure_bridge() {
bridge.begin();
/* Configure video section */
for (int i = 0; i <= 6; i++) {
bridge.pinMode(i, INPUT);
}
bridge.pinMode(7, OUTPUT);
/* Configure keyboard section */
for (int i = 8; i <= 15; i++) {
bridge.pinMode(i, OUTPUT);
}
}
byte incomingByte;
void handle_input() {
if (Serial.available() > 0) {
digitalWrite(KBD_STROBE, LOW);
incomingByte = Serial.read();
/* Convert ESC key */
if (incomingByte == 203) {
incomingByte = 27;
}
/* Convert lowercase keys to UPPERCASE */
if (incomingByte > 96 && incomingByte < 123) {
incomingByte -= 32;
}
if (incomingByte == 65) {
incomingByte = 10;
}
if (incomingByte == 66) {
incomingByte = 13;
}
/* Output the actual keys as long as it's supported */
if (incomingByte < 96) {
bridge.writePort(1, reverse(incomingByte));
digitalWrite(KBD_STROBE, HIGH);
delay(20);
digitalWrite(KBD_STROBE, LOW);
//Serial.print("TX ");
//print_chr(incomingByte);
}
}
}
unsigned char reverse( unsigned char x )
{
x = ((x >> 1) & 0x55) | ((x << 1) & 0xaa);
x = ((x >> 2) & 0x33) | ((x << 2) & 0xcc);
x = ((x >> 4) & 0x0f) | ((x << 4) & 0xf0);
return x;
}
void handle_output() {
digitalWrite(VIDEO_RDA, HIGH);
if (digitalRead(VIDEO_DA) == HIGH) {
char incomingByte = bridge.readPort(0) & 127;
digitalWrite(VIDEO_RDA, LOW);
delay(12);
Serial.print("RX ");
print_chr(incomingByte);
}
}
void print_chr(char c) {
Serial.print((char) c);
Serial.print(" (0x");
Serial.print(c, HEX);
Serial.println(")");
}
void loop() {
handle_input();
handle_output();
}