mirror of
https://github.com/DCC-EX/CommandStation-EX.git
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335 lines
13 KiB
C++
335 lines
13 KiB
C++
/*
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* © 2024, Chris Harlow. All rights reserved.
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*
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* This file is part of EX-CommandStation
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*
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* This is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* It is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
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*/
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/*
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* The IO_NEOPIXEL.h device driver integrates with one or more Adafruit neopixel drivers.
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* This device driver will configure the device on startup, along with
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* interacting with the device for all input/output duties.
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*
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* To create NEOPIXEL devices, these are defined in myAutomation.h:
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* (Note the device driver is included by default)
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*
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* HAL(NEOPIXEL,first vpin, number of pixels,mode, i2c address)
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* e.g. HAL(NEOPIXEL,1000,64,NEO_RGB,0x60)
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* This gives each pixel in the chain an individual vpin
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* The number of pixels must match the physical pixels in the chain.
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*
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* This driver maintains a colour (rgb value in 5,5,5 bits only) plus an ON bit.
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* This can be written/read with an analog write/read call.
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* The ON bit can be set on and off with a digital write. This allows for
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* a pixel to be preset a colour and then turned on and off like any other light.
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*/
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#ifndef IO_EX_NeoPixel_H
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#define IO_EX_NeoPixel_H
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#include "IODevice.h"
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#include "I2CManager.h"
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#include "DIAG.h"
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#include "FSH.h"
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// The following macros to define the Neopixel String type
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// have been copied from the Adafruit Seesaw Library under the
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// terms of the GPL.
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// Credit to: https://github.com/adafruit/Adafruit_Seesaw
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// The order of primary colors in the NeoPixel data stream can vary
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// among device types, manufacturers and even different revisions of
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// the same item. The third parameter to the seesaw_NeoPixel
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// constructor encodes the per-pixel byte offsets of the red, green
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// and blue primaries (plus white, if present) in the data stream --
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// the following #defines provide an easier-to-use named version for
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// each permutation. e.g. NEO_GRB indicates a NeoPixel-compatible
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// device expecting three bytes per pixel, with the first byte
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// containing the green value, second containing red and third
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// containing blue. The in-memory representation of a chain of
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// NeoPixels is the same as the data-stream order; no re-ordering of
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// bytes is required when issuing data to the chain.
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// Bits 5,4 of this value are the offset (0-3) from the first byte of
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// a pixel to the location of the red color byte. Bits 3,2 are the
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// green offset and 1,0 are the blue offset. If it is an RGBW-type
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// device (supporting a white primary in addition to R,G,B), bits 7,6
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// are the offset to the white byte...otherwise, bits 7,6 are set to
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// the same value as 5,4 (red) to indicate an RGB (not RGBW) device.
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// i.e. binary representation:
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// 0bWWRRGGBB for RGBW devices
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// 0bRRRRGGBB for RGB
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// RGB NeoPixel permutations; white and red offsets are always same
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// Offset: W R G B
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#define NEO_RGB ((0 << 6) | (0 << 4) | (1 << 2) | (2))
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#define NEO_RBG ((0 << 6) | (0 << 4) | (2 << 2) | (1))
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#define NEO_GRB ((1 << 6) | (1 << 4) | (0 << 2) | (2))
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#define NEO_GBR ((2 << 6) | (2 << 4) | (0 << 2) | (1))
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#define NEO_BRG ((1 << 6) | (1 << 4) | (2 << 2) | (0))
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#define NEO_BGR ((2 << 6) | (2 << 4) | (1 << 2) | (0))
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// RGBW NeoPixel permutations; all 4 offsets are distinct
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// Offset: W R G B
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#define NEO_WRGB ((0 << 6) | (1 << 4) | (2 << 2) | (3))
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#define NEO_WRBG ((0 << 6) | (1 << 4) | (3 << 2) | (2))
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#define NEO_WGRB ((0 << 6) | (2 << 4) | (1 << 2) | (3))
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#define NEO_WGBR ((0 << 6) | (3 << 4) | (1 << 2) | (2))
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#define NEO_WBRG ((0 << 6) | (2 << 4) | (3 << 2) | (1))
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#define NEO_WBGR ((0 << 6) | (3 << 4) | (2 << 2) | (1))
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#define NEO_RWGB ((1 << 6) | (0 << 4) | (2 << 2) | (3))
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#define NEO_RWBG ((1 << 6) | (0 << 4) | (3 << 2) | (2))
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#define NEO_RGWB ((2 << 6) | (0 << 4) | (1 << 2) | (3))
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#define NEO_RGBW ((3 << 6) | (0 << 4) | (1 << 2) | (2))
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#define NEO_RBWG ((2 << 6) | (0 << 4) | (3 << 2) | (1))
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#define NEO_RBGW ((3 << 6) | (0 << 4) | (2 << 2) | (1))
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#define NEO_GWRB ((1 << 6) | (2 << 4) | (0 << 2) | (3))
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#define NEO_GWBR ((1 << 6) | (3 << 4) | (0 << 2) | (2))
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#define NEO_GRWB ((2 << 6) | (1 << 4) | (0 << 2) | (3))
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#define NEO_GRBW ((3 << 6) | (1 << 4) | (0 << 2) | (2))
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#define NEO_GBWR ((2 << 6) | (3 << 4) | (0 << 2) | (1))
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#define NEO_GBRW ((3 << 6) | (2 << 4) | (0 << 2) | (1))
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#define NEO_BWRG ((1 << 6) | (2 << 4) | (3 << 2) | (0))
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#define NEO_BWGR ((1 << 6) | (3 << 4) | (2 << 2) | (0))
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#define NEO_BRWG ((2 << 6) | (1 << 4) | (3 << 2) | (0))
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#define NEO_BRGW ((3 << 6) | (1 << 4) | (2 << 2) | (0))
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#define NEO_BGWR ((2 << 6) | (3 << 4) | (1 << 2) | (0))
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#define NEO_BGRW ((3 << 6) | (2 << 4) | (1 << 2) | (0))
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// If 400 KHz support is enabled, the third parameter to the constructor
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// requires a 16-bit value (in order to select 400 vs 800 KHz speed).
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// If only 800 KHz is enabled (as is default on ATtiny), an 8-bit value
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// is sufficient to encode pixel color order, saving some space.
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#define NEO_KHZ800 0x0000 // 800 KHz datastream
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#define NEO_KHZ400 0x0100 // 400 KHz datastream
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/////////////////////////////////////////////////////////////////////////////////////////////////////
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/*
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* IODevice subclass for NeoPixel.
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*/
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class NeoPixel : public IODevice {
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public:
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static void create(VPIN vpin, int nPins, uint16_t mode=(NEO_GRB | NEO_KHZ800), I2CAddress i2cAddress=0x60) {
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if (checkNoOverlap(vpin, nPins, mode, i2cAddress)) new NeoPixel(vpin, nPins, mode, i2cAddress);
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}
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private:
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static const byte SEESAW_NEOPIXEL_BASE=0x0E;
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static const byte SEESAW_NEOPIXEL_STATUS = 0x00;
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static const byte SEESAW_NEOPIXEL_PIN = 0x01;
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static const byte SEESAW_NEOPIXEL_SPEED = 0x02;
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static const byte SEESAW_NEOPIXEL_BUF_LENGTH = 0x03;
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static const byte SEESAW_NEOPIXEL_BUF=0x04;
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static const byte SEESAW_NEOPIXEL_SHOW=0x05;
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// all adafruit examples say this pin. Presumably its hard wired
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// in the adapter anyway.
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static const byte SEESAW_PIN15 = 15;
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// Constructor
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NeoPixel(VPIN firstVpin, int nPins, uint16_t mode, I2CAddress i2cAddress) {
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_firstVpin = firstVpin;
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_nPins=nPins;
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_I2CAddress = i2cAddress;
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// calculate the offsets into the seesaw buffer for each colour depending
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// on the pixel strip type passed in mode.
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_redOffset=4+(mode >> 4 & 0x03);
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_greenOffset=4+(mode >> 2 & 0x03);
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_blueOffset=4+(mode & 0x03);
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if (4+(mode >>6 & 0x03) == _redOffset) _bytesPerPixel=3;
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else _bytesPerPixel=4; // string has a white byte.
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_kHz800=(mode & NEO_KHZ400)==0;
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_showPendimg=false;
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// Each pixel requires 3 bytes RGB memory.
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// Although the driver device can remember this, it cant do off/on without
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// forgetting what the on colour was!
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pixelBuffer=(RGB *) malloc(_nPins*sizeof(RGB));
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stateBuffer=(byte *) calloc((_nPins+7)/8,sizeof(byte)); // all pixels off
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if (pixelBuffer==nullptr || stateBuffer==nullptr) {
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DIAG(F("NeoPixel I2C:%s not enough RAM"), _I2CAddress.toString());
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return;
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}
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// preset all pins to white so a digital on/off will do something even if no colour set.
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memset(pixelBuffer,0xFF,_nPins*sizeof(RGB));
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addDevice(this);
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}
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void _begin() {
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// Initialise Neopixel device
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I2CManager.begin();
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if (!I2CManager.exists(_I2CAddress)) {
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DIAG(F("NeoPixel I2C:%s device not found"), _I2CAddress.toString());
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_deviceState = DEVSTATE_FAILED;
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return;
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}
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byte speedBuffer[]={SEESAW_NEOPIXEL_BASE, SEESAW_NEOPIXEL_SPEED,_kHz800};
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I2CManager.write(_I2CAddress, speedBuffer, sizeof(speedBuffer));
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// In the driver there are 3 of 4 byts per pixel
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auto numBytes=_bytesPerPixel * _nPins;
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byte setbuffer[] = {SEESAW_NEOPIXEL_BASE, SEESAW_NEOPIXEL_BUF_LENGTH,
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(byte)(numBytes >> 8), (byte)(numBytes & 0xFF)};
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I2CManager.write(_I2CAddress, setbuffer, sizeof(setbuffer));
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const byte pinbuffer[] = {SEESAW_NEOPIXEL_BASE, SEESAW_NEOPIXEL_PIN,SEESAW_PIN15};
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I2CManager.write(_I2CAddress, pinbuffer, sizeof(pinbuffer));
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for (auto pin=0;pin<_nPins;pin++) transmit(pin);
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_display();
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}
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// loop called by HAL supervisor
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void _loop(unsigned long currentMicros) override {
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(void)currentMicros;
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if (!_showPendimg) return;
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byte showBuffer[]={SEESAW_NEOPIXEL_BASE,SEESAW_NEOPIXEL_SHOW};
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I2CManager.write(_I2CAddress,showBuffer,sizeof(showBuffer));
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_showPendimg=false;
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}
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// read back pixel on/off
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int _read(VPIN vpin) override {
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if (_deviceState == DEVSTATE_FAILED) return 0;
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return isPixelOn(vpin-_firstVpin);
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}
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// Write digital value. Sets pixel on or off
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void _write(VPIN vpin, int value) override {
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if (_deviceState == DEVSTATE_FAILED) return;
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auto pixel=vpin-_firstVpin;
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if (value) {
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if (isPixelOn(pixel)) return;
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setPixelOn(pixel);
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}
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else { // set off
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if (!isPixelOn(pixel)) return;
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setPixelOff(pixel);
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}
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transmit(pixel);
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}
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VPIN _writeRange(VPIN vpin,int value, int count) {
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// using write range cuts out the constant vpin to driver lookup so
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// we can update multiple pixels much faster.
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VPIN nextVpin=vpin + (count>_nPins ? _nPins : count);
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if (_deviceState != DEVSTATE_FAILED) while(vpin<nextVpin) {
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_write(vpin,value);
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vpin++;
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}
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return nextVpin; // next pin we cant
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}
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// Write analogue value.
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// The convoluted parameter mashing here is to allow passing the RGB and on/off
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// information through the generic HAL _writeAnalog interface which was originally
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// designed for servos and short integers
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void _writeAnalogue(VPIN vpin, int colour_RG, uint8_t onoff, uint16_t colour_B) override {
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if (_deviceState == DEVSTATE_FAILED) return;
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RGB newColour={(byte)((colour_RG>>8) & 0xFF), (byte)(colour_RG & 0xFF), (byte)(colour_B & 0xFF)};
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auto pixel=vpin-_firstVpin;
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if (pixelBuffer[pixel]==newColour && isPixelOn(pixel)==(bool)onoff) return; // no change
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if (onoff) setPixelOn(pixel); else setPixelOff(pixel);
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pixelBuffer[pixel]=newColour;
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transmit(pixel);
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}
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VPIN _writeAnalogueRange(VPIN vpin, int colour_RG, uint8_t onoff, uint16_t colour_B, int count) override {
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// using write range cuts out the constant vpin to driver lookup so
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VPIN nextVpin=vpin + (count>_nPins ? _nPins : count);
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if (_deviceState != DEVSTATE_FAILED) while(vpin<nextVpin) {
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_writeAnalogue(vpin,colour_RG, onoff,colour_B);
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vpin++;
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}
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return nextVpin; // next pin we cant
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}
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// Display device information and status.
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void _display() override {
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DIAG(F("NeoPixel I2C:%s Vpins %u-%u %S"),
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_I2CAddress.toString(),
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(int)_firstVpin, (int)_firstVpin+_nPins-1,
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_deviceState == DEVSTATE_FAILED ? F("OFFLINE") : F(""));
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}
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bool isPixelOn(int16_t pixel) {return stateBuffer[pixel/8] & (0x80>>(pixel%8));}
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void setPixelOn(int16_t pixel) {stateBuffer[pixel/8] |= (0x80>>(pixel%8));}
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void setPixelOff(int16_t pixel) {stateBuffer[pixel/8] &= ~(0x80>>(pixel%8));}
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// Helper function for error handling
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void reportError(uint8_t status, bool fail=true) {
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DIAG(F("NeoPixel I2C:%s Error:%d (%S)"), _I2CAddress.toString(),
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status, I2CManager.getErrorMessage(status));
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if (fail)
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_deviceState = DEVSTATE_FAILED;
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}
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void transmit(uint16_t pixel) {
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byte buffer[]={SEESAW_NEOPIXEL_BASE,SEESAW_NEOPIXEL_BUF,0x00,0x00,0x00,0x00,0x00};
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uint16_t offset= pixel * _bytesPerPixel;
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buffer[2]=(byte)(offset>>8);
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buffer[3]=(byte)(offset & 0xFF);
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if (isPixelOn(pixel)) {
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auto colour=pixelBuffer[pixel];
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buffer[_redOffset]=colour.red;
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buffer[_greenOffset]=colour.green;
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buffer[_blueOffset]=colour.blue;
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} // else leave buffer black (in buffer preset to zeros above)
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// Transmit pixel to driver
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I2CManager.write(_I2CAddress,buffer,4 +_bytesPerPixel);
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_showPendimg=true;
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}
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struct RGB {
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byte red;
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byte green;
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byte blue;
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bool operator==(const RGB& other) const {
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return red == other.red && green == other.green && blue == other.blue;
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}
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};
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RGB* pixelBuffer = nullptr;
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byte* stateBuffer = nullptr; // 1 bit per pixel
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bool _showPendimg;
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// mapping of RGB onto pixel buffer for seesaw.
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byte _bytesPerPixel;
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byte _redOffset;
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byte _greenOffset;
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byte _blueOffset;
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bool _kHz800;
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};
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#endif
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