hyperion.ng/libsrc/leddevice/LedDeviceWs2812SPI.h
penfold42 a960894d14 Another option for Ws2812 - direct spi from the pi with 1 wire (#631)
* Removed -HUP so the default -TERM signal is sent instead.
- hyperiond only listens for TERM and INT. HUP is often used to get an exe to reread its config

Changed pgrep to add '-x' so it wont partial match on the exe name.
- I have multiple instances with multiple hyperiond-instance1 names
- this ensures the service script only kills the right process

* reversing errant change to hyperion.systemd.sh

* This add a new device type - ws2812spi.

I've (ab)used the SPI interface to send the correct timing pulses to keep the ws2812 happy.
THE RATE IS IMPORTANT!
A FIXED CORE_CLK IS IMPORTANT!

Attach the SPI MOSI pin on the Pi to the DIN pin on your ws2812

        "device" :
        {
                "name"       : "MyPi",
                "type"       : "ws2812spi",
                "colorOrder" : "grb",
                "output"     : "/dev/spidev0.0",
                "rate"       : 3800000
        },

* updated hyperiond.test-binary

* Updated default SPI speed to the "correct" value.
My Pi was undervolted so was dropping the core clock confusing everything

* Code cleanups
explicitly set the final 3 bytes to 0

* Removed latchtime option - not applicable

* updated test binary


Former-commit-id: d3c19c8374999f7a554bb25ca181a8a483f86289
2016-05-15 18:39:17 +02:00

53 lines
1.2 KiB
C++

#pragma once
// STL includes
#include <string>
// hyperion incluse
#include "LedSpiDevice.h"
///
/// Implementation of the LedDevice interface for writing to Ws2801 led device.
///
class LedDeviceWs2812SPI : public LedSpiDevice
{
public:
///
/// Constructs the LedDevice for a string containing leds of the type Ws2812SPI
///
/// @param outputDevice The name of the output device (eg '/etc/SpiDev.0.0')
/// @param baudrate The used baudrate for writing to the output device
///
LedDeviceWs2812SPI(const std::string& outputDevice,
const unsigned baudrate);
LedDeviceWs2812SPI(const std::string& outputDevice,
const unsigned baudrate,
const unsigned latchTime);
///
/// Writes the led color values to the led-device
///
/// @param ledValues The color-value per led
/// @return Zero on succes else negative
///
virtual int write(const std::vector<ColorRgb> &ledValues);
/// Switch the leds off
virtual int switchOff();
private:
/// the number of leds (needed when switching off)
size_t mLedCount;
std::vector<uint8_t> _spiBuffer;
uint8_t bitpair_to_byte[4] = {
0b10001000,
0b10001100,
0b11001000,
0b11001100,
};
};