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Sound working at very low cpu frequencies

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This commit is contained in:
Daniele Verducci su MatissePenguin
2020-12-05 12:45:18 +01:00
parent 7c6300af8a
commit 3d4d5360c1
4 changed files with 106 additions and 32 deletions
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15
arduino/SN76489-test/SN76489-test.ino
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@ -16,7 +16,7 @@ void setup() {
pinMode(WE, OUTPUT);
digitalWrite(WE, HIGH);
/* Init device (silence all channels)
/* Init device (silence all channels)
* Bits meaning:
* 1 R0 R1 R2 A0 A1 A2 A3
* Bit0 is 1
@ -32,7 +32,7 @@ void setup() {
// Channel 1 to max volume
SendByte(B10010000);
/* Play note on channel 1
* Requires sending 2 bytes.
* Bits meaning:
@ -50,7 +50,7 @@ void setup() {
SendByte(B10000000); SendByte(B00001000);
delay(500);
SendByte(B10011111); // Sil ch 1
SendByte(B10011111); // Sil ch 1
delay(1000);
@ -65,7 +65,7 @@ void setup() {
SendByte(B11000000); SendByte(B00001000); // Note on ch3
delay(500);
SendByte(B10011111); // Sil ch 1
SendByte(B10011111); // Sil ch 1
SendByte(B10111111); // Sil ch 2
SendByte(B11011111); // Sil ch 3
@ -73,13 +73,10 @@ void setup() {
/*
* Play noise on channel 4
*/
}
void loop() {
}
void loop() {}
void SendByte(byte b) {
digitalWrite(DATA_BUS[0], (b&1)?HIGH:LOW);