132 lines
2.2 KiB
C++
132 lines
2.2 KiB
C++
#define OE 3
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// PGM is also WE# according to data sheet
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#define PGM 2
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// 18 pin address line
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#define Addr0 22
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#define Addr18 40
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// 8 pin data line
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#define Data0 44
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#define Data7 51
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void setCtrlPins() {
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pinMode(OE, OUTPUT);
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pinMode(PGM, OUTPUT);
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}
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void setAddrPinsOut() {
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for(int a = Addr0; a <= Addr18; a++) {
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pinMode(a, OUTPUT);
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digitalWrite(a, LOW);
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}
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}
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void setDataPinsOut() {
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for(int d = Data0; d <= Data7; d++) {
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pinMode(d, OUTPUT);
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digitalWrite(Data0 + d, LOW);
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}
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}
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void setDataPinsIn() {
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for(int d = Data0; d <= Data7; d++) {
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pinMode(Data0 + d, INPUT);
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}
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}
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void setByte(byte out) {
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for(int i = 0; i < 8; i++) {
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digitalWrite(Data0 + i, bitRead(out,i));
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}
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}
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void setAddress(unsigned long addr) {
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for(int i = 0; i < 19; i++) {
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digitalWrite(Addr0 + i, bitRead(addr, i) );
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}
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}
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byte readByte() {
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byte temp_in = 0;
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for(int i = 0; i < 8; i++) {
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if(digitalRead(Data0 + i)) {
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bitSet(temp_in, i);
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}
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}
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return temp_in;
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}
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byte readData(unsigned long address) {
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byte temp_read;
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setDataPinsIn();
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digitalWrite(PGM, HIGH);
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digitalWrite(OE, HIGH);
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setAddress(address);
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digitalWrite(OE, LOW);
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delayMicroseconds(1);
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temp_read = readByte();
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return temp_read;
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}
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void writeByte(byte data, unsigned long address) {
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setAddress(address);
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setByte(data);
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digitalWrite(OE, HIGH);
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digitalWrite(PGM, HIGH);
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delayMicroseconds(2);
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digitalWrite(PGM, LOW);
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delayMicroseconds(1);
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digitalWrite(PGM, HIGH);
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}
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void programData(byte data, unsigned long address) {
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setDataPinsOut();
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writeByte(0xAA, 0x5555);
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writeByte(0x55, 0x2AAA);
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writeByte(0xA0, 0x5555);
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writeByte(data, address);
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delayMicroseconds(30);
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Serial.println(data, HEX);
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Serial.println(address, HEX);
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}
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void setup() {
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// Debug trigger
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pinMode(10, OUTPUT);
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digitalWrite(10, LOW);
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// put your setup code here, to run once:
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setCtrlPins();
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setAddrPinsOut();
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setDataPinsOut();
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Serial.begin(9600);
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delay(2);
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Serial.println("Started Serial COM.");
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}
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void loop() {
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// put your main code here, to run repeatedly:
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programData(0x3F, 0x0000);
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byte data = readData(0x0000);
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// Serial.print("data: ");
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Serial.print("Data returned: ");
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Serial.println(data, HEX);
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// Serial.println("\n");
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delay(1);
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}
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