Quick sketch to speed up the SK Pang Arduino DMX Shield serial in communication protocol.

gistfile1.c

#include <DmxSimple.h>
 
// 57600 baud rate
// unsigned char channel | unsigned char value | for 27 times then  | read                  |
// read                  | read                | for 27 times then  | unsigned char success |
 
 
// DMX devices typically need to receive a complete set of channels
// even if you only need to adjust the first channel. You can
// easily change the number of channels sent here. If you don't
// do this, DmxSimple will set the maximum channel number to the
// highest channel you DmxSimple.write() to.
int maxChannels = 64;
 
void setup() {
    // The most common pin for DMX output is pin 3, which DmxSimple
    // uses by default. If you need to change that, do it here.
    DmxSimple.usePin(2);
    DmxSimple.maxChannel(maxChannels);
     
    Serial.begin(115200);
    Serial.print('ready to go');
}
 
 void loop() {
     int c;
     int v;
     for (int i = 0; i < 27; ++i) {
        while(!Serial.available());
        c = Serial.read();
        while(!Serial.available());
        v = Serial.read();
        DmxSimple.write(c, v);
    }
    Serial.println();
}