Apple-1-HW/RC6502-Apple-1-Replica
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Reorganized some code (still not working though)

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This commit is contained in:
Unknown 2017-05-30 22:33:47 +02:00
parent 4d2d7a3bf4
commit 58807dee46
1 changed files with 51 additions and 49 deletions
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100
RC6502 Serial IO/pia_bridge/pia_bridge.ino
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@ -2,13 +2,15 @@
#include <MCP23S17.h>
#define IO_SS 10
#define IO_VIDEO 0
#define IO_VIDEO_D0 0
#define IO_VIDEO_D6 6
#define IO_KBD 1
#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
@ -37,10 +39,10 @@ void configure_bridge() {
bridge.begin();
/* Configure video section */
for (int i = 0; i <= 6; i++) {
for (int i = IO_VIDEO_D0; i <= IO_VIDEO_D6; i++) {
bridge.pinMode(i, INPUT);
}
bridge.pinMode(7, OUTPUT);
bridge.pinMode(7, INPUT_PULLUP);
/* Configure keyboard section */
for (int i = 8; i <= 15; i++) {
@ -48,54 +50,17 @@ void configure_bridge() {
}
}
byte incomingByte;
void handle_input() {
void serial_receive() {
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);
}
pia_send( Serial.read() );
}
}
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() {
void serial_transmit() {
digitalWrite(VIDEO_RDA, HIGH);
delay(12);
if (digitalRead(VIDEO_DA) == HIGH) {
char incomingByte = bridge.readPort(0) & 127;
char incomingByte = bridge.readPort(IO_VIDEO) & 127;
digitalWrite(VIDEO_RDA, LOW);
delay(12);
@ -111,7 +76,44 @@ void print_chr(char c) {
Serial.println(")");
}
void pia_send(byte c) {
/* Make sure STROBE signal is off */
digitalWrite(KBD_STROBE, LOW);
/* Convert ESC key */
if (c == 203) {
c = 27;
}
/* Convert lowercase keys to UPPERCASE */
if (c > 96 && c < 123) {
c -= 32;
}
/* Output the actual keys as long as it's supported */
if (c < 96) {
bridge.writePort(IO_KBD, c | 128);
digitalWrite(KBD_STROBE, HIGH);
/*
while(digitalRead(KBD_READY) != LOW) {
Serial.print("-");
delay(1);
}
*/
delay(23);
digitalWrite(KBD_STROBE, LOW);
/*
while(digitalRead(KBD_READY) == HIGH) {
Serial.print(".");
delay(1);
}
*/
Serial.print("TX ");
print_chr(c);
}
}
void loop() {
handle_input();
handle_output();
serial_receive();
serial_transmit();
}