87 lines
1.5 KiB
Arduino
87 lines
1.5 KiB
Arduino
unsigned long tic_loop = 0;
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const unsigned int FRAME_TIME = 25; // 20 ms -> 50 FPS
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byte channels_buffer[512] = {0};
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unsigned int bytes_to_write = 512;
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const unsigned int START_ADDR = 10;
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const unsigned int NUM_CHANNELS = 9;
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byte dmx_data[] = {
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0,
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0,
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134,
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255,
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0,
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0,
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0,
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0,
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0,
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};
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void setup()
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{
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Serial.begin(115200); // USB
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Serial1.begin(250000, SERIAL_8N2); // DMX
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tic_loop = millis();
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for (int i = 0; i < NUM_CHANNELS; ++i)
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{
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channels_buffer[START_ADDR - 1 + i] = dmx_data[i];
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}
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}
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void loop()
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{
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// update_buffer();
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// this section gets executed at a maximum rate of around 40Hz
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if ((millis() - tic_loop) > FRAME_TIME)
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{
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tic_loop = millis();
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send_dmx_header();
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Serial1.write(channels_buffer, bytes_to_write);
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}
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delay(1);
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}
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void update_buffer()
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{
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int n = Serial.available();
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if (n < 1)
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return;
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n -= 1;
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if (Serial.read() == n)
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{
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Serial.read(channels_buffer, n);
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bytes_to_write = n;
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}
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else
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{
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// incomplete
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while (Serial.available())
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Serial.read();
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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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while (Serial1.available())
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Serial1.read();
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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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while (Serial1.available())
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Serial1.read();
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Serial1.write(0); // Start-Byte
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} |