87 lines
1.7 KiB
C++
87 lines
1.7 KiB
C++
unsigned long tic_loop = 0;
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unsigned long time_since_last_sync;
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const unsigned long SYNC_TIMEOUT = 1000;
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const unsigned int FRAME_TIME = 20; // 20 ms -> 50 FPS
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const size_t UNIVERSE_SIZE = 512;
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byte channels_buffer[UNIVERSE_SIZE] = {0};
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size_t bytes_read = 0;
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void setup()
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{
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Serial.begin(115200); // USB
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while (!Serial)
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{
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// spin until serial is up
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}
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Serial.println();
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Serial.println("Sync.");
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time_since_last_sync = millis();
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Serial1.begin(250000, SERIAL_8N2); // DMX
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}
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void loop()
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{
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bool packet_ready = update_buffer();
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if (packet_ready)
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{
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send_packet();
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}
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}
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void send_packet()
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{
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send_dmx_header();
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Serial1.write(channels_buffer, UNIVERSE_SIZE);
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}
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bool update_buffer()
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{
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unsigned long now = millis();
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size_t n = Serial.available();
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if (!n)
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{
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// nothing available to read
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if (now - time_since_last_sync > SYNC_TIMEOUT)
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{
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// re-sync
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bytes_read = 0;
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Serial.println("Sync.");
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time_since_last_sync = now;
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}
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return false;
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}
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time_since_last_sync = now;
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int bytes_received = Serial.read(channels_buffer + bytes_read, std::min(n, UNIVERSE_SIZE - bytes_read));
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bytes_read += bytes_received;
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if (bytes_read == UNIVERSE_SIZE)
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{
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bytes_read = 0;
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Serial.println("Ack.");
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return true;
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}
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else
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{
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return false;
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}
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}
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void send_dmx_header()
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{
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Serial1.flush();
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Serial1.begin(90000, SERIAL_8N2);
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// send the break as a "slow" byte
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Serial1.write(0);
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// switch back to the original baud rate
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Serial1.flush();
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Serial1.begin(250000, SERIAL_8N2);
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Serial1.write(0); // Start-Byte
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} |