GaZeLL Dongle

The RFDongleGZLL is easy to program using the RFduino extensions to the Arduino IDE. If you want to use the built-in LED you need to know it is a WS2812B Serial RGB LED connected to GPIO2. The WS2812B Serial RGB LED uses a specific serial protocol with rather strict timing requirements. A simple subroutine, loadWS2812(), that meets the required timing is provided in the examples below. No complicated library is needed for this simple use case.

RFduino example code to utilize the WS2812B RGB LED WS2812_GZLL_Dongle.ino // WS2812_GZLL_Dongle based on RFduino // By Thomas Olson // teo20140220.01 // teo20140719.01 Modified for Arduino 1.5.7 // verified still works with Arduino 1.5.8+, 1.6.x, and 1.8.1 // No complicated Pixel Library needed. // Tested with WS2812B 4 pin versions. // Modified for RFDdongleGZLL const int ws2812pin = 2; const int nPIXELS = 1; const int nLEDs = nPIXELS * 3; uint8_t ledBar[nLEDs]; int ledGREEN = 0; int ledRED = 1; int ledBLUE = 2; void setup() { pinMode(ws2812pin, OUTPUT); digitalWrite(ws2812pin, LOW); // Initialize the ledBar array - all LEDs OFF. clearWS2812(); } void loop() { for(int brightness = 0; brightness < 0x2c; brightness+=10){ flashRED(brightness, 100); } delay(1000); flashBLUE(0x2c, 150); delay(1000); flashGREEN(0x2c, 150); delay(1000); flashBLUE(0x2c, 150); delay(1000); twiddle(ledGREEN, ledRED); delay(1000); twiddle(ledRED, ledBLUE); delay(1000); twiddle(ledBLUE, ledGREEN); delay(1000); } // Twiddle (Twinkle between 2 colors) void twiddle(int led1, int led2){ // toggle between two colors for(int i=0; i<9; i++){ ledBar[led1] = 0x2c; ledBar[led2] = 0x00; loadWS2812(); delay(50); ledBar[led1] = 0x00; ledBar[led2] = 0x2c; loadWS2812(); delay(50); } ledBar[led2] = 0x00; loadWS2812(); } void flashRED(int pwm, int duration){ ledBar[ledRED] = pwm; loadWS2812(); delay(duration); ledBar[ledRED] = 0x00; loadWS2812(); } void flashBLUE(int pwm, int duration){ ledBar[ledBLUE] = pwm; loadWS2812(); delay(duration); ledBar[ledBLUE] = 0x00; loadWS2812(); } void flashGREEN(int pwm, int duration){ ledBar[ledGREEN] = pwm; loadWS2812(); delay(duration); ledBar[ledGREEN] = 0x00; loadWS2812(); } void setRED(int pwm){ ledBar[ledRED] = pwm; } void setGREEN(int pwm){ ledBar[ledGREEN] = pwm; } void setBLUE(int pwm){ ledBar[ledBLUE] = pwm; } void clearWS2812(){ bzero(ledBar,3); loadWS2812(); } // NOTE: The WS2812 serial LED requires critical timing. // The loadWS2812 subroutine handles this if no changes are // made to the subroutine. Works great with WS2812B used // on the RFDongleGZLL device. The subroutine can handle // strings of many WS2812 leds. But for the GZZL Dongle it // only uses 1 RGB LED consisting of three LEDs... nLEDs=3. // The variable nLEDs and array ledBAR[] are globally defined. void loadWS2812(){ noInterrupts(); for(int wsOut = 0; wsOut < nLEDs; wsOut++){ for(int x=7; x>=0; x--){ NRF_GPIO->OUTSET = (1UL << ws2812pin); if(ledBar[wsOut] & (0x01 << x)) { __ASM ( \ " NOP\n\t" \ " NOP\n\t" \ " NOP\n\t" \ " NOP\n\t" \ " NOP\n\t" \ ); NRF_GPIO->OUTCLR = (1UL << ws2812pin); }else{ NRF_GPIO->OUTCLR = (1UL << ws2812pin); __ASM ( \ " NOP\n\t" \ " NOP\n\t" \ " NOP\n\t" \ ); } } } delayMicroseconds(50); // latch and reset WS2812. interrupts(); }