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MC3446_Tester.ino
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MC3446_Tester.ino
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/*
MC3446 Quadruple Bus Transceiver
Arduino code to test MC3446 bus transceiver chips which are used on the Commodore PET
I build this circuit on my Mega but if you change the Arduino pin numbering there is no reason why it should not work on the Uno.
26 August
Version 1.0
myretrostore.co.uk
Compile with Arduido IDE 1.8.19
Pin Mappings:
MC3446 Arduino | MC3446 Arduino
Pin 1 (1R) D22 | Pin 16 (VCC)
Pin 2 (1B) D23 | Pin 15 (4R) D11
Pin 3 (1D) D30 | Pin 14 (4B) D10
Pin 4 (1,2,3S) D25 | Pin 13 (4D) D9
Pin 5 (2D) D26 | Pin 12 (4S) D8
Pin 6 (2B) D27 | Pin 11 (3D) D7
Pin 7 (2R) D28 | Pin 10 (3B) D6
Pin 8 (GND) | Pin 9 (3R) D5
Datasheet: https://www.alldatasheet.com/datasheet-pdf/pdf/127175/TI/MC3446.html
Dependencies: DIO2
https://github.com/Locoduino/DIO2
*/
#include <DIO2.h>
#define VERSION "Version 1.0"
// Pin definitions
#define Pin_1R 22
#define Pin_1B 23
#define Pin_1D 30
#define Pin_123S 25
#define Pin_2D 26
#define Pin_2B 27
#define Pin_2R 28
#define Pin_3R 5
#define Pin_3B 6
#define Pin_3D 7
#define Pin_4S 8
#define Pin_4D 9
#define Pin_4B 10
#define Pin_4R 11
byte InputD[] = {Pin_1D, Pin_2D, Pin_3D, Pin_4D };
byte OutputR[] = {Pin_1R, Pin_2R, Pin_3R, Pin_4R };
byte IO_B[] = {Pin_1B, Pin_2B, Pin_3B, Pin_4B};
int readPin;
//---------------------------------------------------
// Set B pins as output
//---------------------------------------------------
void B_Output()
{
for (int i = 0; i < sizeof(IO_B); i++) {
pinMode2(IO_B[i], OUTPUT);
}
}
//---------------------------------------------------
// Set B pins as input
//---------------------------------------------------
void B_Input()
{
for (int i = 0; i < sizeof(IO_B); i++) {
pinMode2(IO_B[i], INPUT_PULLUP);
}
}
//---------------------------------------------------
// Initialise pins as innput/ouput
//---------------------------------------------------
void InitialisePins()
{
//Sets to default transmit S & D low so all outputs are low
pinMode2(Pin_123S, OUTPUT); //Set pin a output
pinMode2(Pin_4S, OUTPUT); //Set pin a output
digitalWrite2(Pin_123S, LOW);
digitalWrite2(Pin_4S, LOW);
//Set 1D, 2D, 3D, 4D as outputs
for (int i = 0; i < sizeof(InputD); i++) {
pinMode2(InputD[i], OUTPUT);
digitalWrite2(InputD[i], LOW);
}
//Set 1R, 2R, 3R, 4R as input
for (int i = 0; i < sizeof(OutputR); i++) {
pinMode2(OutputR[i], INPUT_PULLUP);
}
}
//---------------------------------------------------
// There was a error. Print info and pin number
//---------------------------------------------------
void Error(byte pin_number, boolean pin_result, byte output_type) {
//output_type=0 for B
//output_type=1 for R
String Type;
if (output_type == 0) {
Type = "B";
} else {
Type = "R";
}
Serial.print("\nError: Output ");
Serial.print(pin_number+1);
Serial.print(Type);
Serial.print(" reading ");
if (pin_result) {
Serial.print("HIGH");
} else {
Serial.print("LOW");
}
while (1);
}
//---------------------------------------------------
// Test transmit
//---------------------------------------------------
void testTransmit()
{
Serial.println("Testing transmitting");
//With defaults to transmit and inputs LOW, check that outputs are LOW
// Test that outputs are LOW
Serial.println("Testing R is LOW when S&D set LOW");
for (byte i = 0; i < sizeof(OutputR); i++) {
readPin = digitalRead2(OutputR[i]);
if (readPin == HIGH) {
Error(i, HIGH, 1);
}
}
Serial.println("Testing B is LOW when S&D set LOW");
for (int i = 0; i < sizeof(IO_B); i++) {
readPin = digitalRead2(IO_B[i]);
if (readPin == HIGH) {
Error(i, HIGH, 0);
}
}
// Set D HIGH
for (int i = 0; i < sizeof(InputD); i++) {
digitalWrite2(InputD[i], HIGH);
}
B_Input();
//B and R should now be HIGH
Serial.println("Testing R is HIGH when D set HIGH");
for (int i = 0; i < sizeof(OutputR); i++) {
readPin = digitalRead2(OutputR[i]);
if (readPin == LOW) {
Error(i, LOW, 1);
}
}
Serial.println("Testing B is HIGH when D set HIGH");
for (int i = 0; i < sizeof(IO_B); i++) {
readPin = digitalRead2(IO_B[i]);
if (readPin == LOW) {
Error(i, LOW, 0);
}
}
Serial.println("Transmit test completed");
}
//---------------------------------------------------
// Test receive
//---------------------------------------------------
void testReceive()
{
Serial.println("\nTesting receiving");
B_Output();
//Set S HIGH
digitalWrite2(Pin_123S, HIGH);
digitalWrite2(Pin_4S, HIGH);
//Set B HIGH
for (int i = 0; i < sizeof(IO_B); i++) {
digitalWrite2(IO_B[i], HIGH);
}
//Check that R is HIGH
Serial.println("Testing R is HIGH when S&B set HIGH");
for (int i = 0; i < sizeof(OutputR); i++) {
readPin = digitalRead2(OutputR[i]);
if (readPin == LOW) {
Error(i, LOW, 1);
}
}
//Set B LOW
for (int i = 0; i < sizeof(IO_B); i++) {
digitalWrite2(IO_B[i], LOW);
}
//Check that R is LOW
Serial.println("Checking that R is LOW when B set LOW");
for (int i = 0; i < sizeof(OutputR); i++) {
readPin = digitalRead2(OutputR[i]);
if (readPin == HIGH) { //H
Error(i, HIGH, 1);
}
}
Serial.println("Receiving tests complete");
}
//---------------------------------------------------
// Setup
//---------------------------------------------------
void setup() {
Serial.begin(115200);
while (!Serial)
; // wait for serial port to connect. Needed for native USB port only
Serial.println("\n===========================");
Serial.println(" MC3446 Chip Tester");
Serial.println(" myretrostore.co.uk");
Serial.print(" "); Serial.println(VERSION);
Serial.println("===========================");
InitialisePins();
}
//---------------------------------------------------
// Main program
//---------------------------------------------------
void loop() {
for (byte pass = 1; pass < 11; pass++)
{
Serial.print("\nPass: ");
Serial.println(pass);
testTransmit();
testReceive();
}
Serial.println("\nAll tests passed!");
while (1);
}