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View Code? Open in Web Editor NEWRaspberry Pi library to drive APA102 RGB led over SPI
Raspberry Pi library to drive APA102 RGB led over SPI
In apa102-spi.js the function sendLeds is not sending the 'endframe' to the ledstrip. It seems the behaviour of the final led, or leds, is inconsistent without it. Adding 1 bits at the end is required. According to the datasheet it should be 32 bits with the value 1. But I've read online that it actually needs to be at least 0.5*nrOfLeds. So 32 will work up to 64 leds.
For me (60 leds) this works (I added only the first two lines in the function):
Apa102spi.prototype.sendLeds = function () {
this.bufferLength += 4;
this.writeBuffer = Buffer.concat([this.writeBuffer, Buffer.alloc(4, '11111111', 'hex')], this.bufferLength);
rpio.spiWrite(this.writeBuffer, this.bufferLength)
}
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