Adds IS31FL3731 RGB Matrix Implementation (#2910)

* adds is31fl3731 rgb matrix implementation

* fix build script for force pushes

* allow bootloader size to be overwritten

* adds planck light implementation

* split led config into 2 arrays

* idk

* betterize register handling

* update planck implementation

* update planck

* refine rgb interface

* cleanup names, rgb matrix

* start documentation

* finish up docs

* add effects list

* clean-up merge

* add RGB_MATRIX_SKIP_FRAMES

* add support for at90usb1286 to bootloader options

1 files changed, 232 insertions, 0 deletions

diff --git a/drivers/avr/TWIlib.c b/drivers/avr/TWIlib.c
new file mode 100644
index 0000000000..b39e3054a5
--- /dev/null
+++ b/drivers/avr/TWIlib.c
@@ -0,0 +1,232 @@
+/*
+ * TWIlib.c
+ *
+ *  Created: 6/01/2014 10:41:33 PM
+ *  Author: Chris Herring
+ *  http://www.chrisherring.net/all/tutorial-interrupt-driven-twi-interface-for-avr-part1/
+ */ 
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include "TWIlib.h"
+#include "util/delay.h"
+
+void TWIInit()
+{
+	TWIInfo.mode = Ready;
+	TWIInfo.errorCode = 0xFF;
+	TWIInfo.repStart = 0;
+	// Set pre-scalers (no pre-scaling)
+	TWSR = 0;
+	// Set bit rate
+	TWBR = ((F_CPU / TWI_FREQ) - 16) / 2;
+	// Enable TWI and interrupt
+	TWCR = (1 << TWIE) | (1 << TWEN);
+}
+
+uint8_t isTWIReady()
+{
+	if ( (TWIInfo.mode == Ready) | (TWIInfo.mode == RepeatedStartSent) )
+	{
+		return 1;
+	}
+	else
+	{
+		return 0;
+	}
+}
+
+uint8_t TWITransmitData(void *const TXdata, uint8_t dataLen, uint8_t repStart)
+{
+	if (dataLen <= TXMAXBUFLEN)
+	{
+		// Wait until ready
+		while (!isTWIReady()) {_delay_us(1);}
+		// Set repeated start mode
+		TWIInfo.repStart = repStart;
+		// Copy data into the transmit buffer
+		uint8_t *data = (uint8_t *)TXdata;
+		for (int i = 0; i < dataLen; i++)
+		{
+			TWITransmitBuffer[i] = data[i];
+		}
+		// Copy transmit info to global variables
+		TXBuffLen = dataLen;
+		TXBuffIndex = 0;
+		
+		// If a repeated start has been sent, then devices are already listening for an address
+		// and another start does not need to be sent. 
+		if (TWIInfo.mode == RepeatedStartSent)
+		{
+			TWIInfo.mode = Initializing;
+			TWDR = TWITransmitBuffer[TXBuffIndex++]; // Load data to transmit buffer
+			TWISendTransmit(); // Send the data
+		}
+		else // Otherwise, just send the normal start signal to begin transmission.
+		{
+			TWIInfo.mode = Initializing;
+			TWISendStart();
+		}
+		
+	}
+	else
+	{
+		return 1; // return an error if data length is longer than buffer
+	}
+	return 0;
+}
+
+uint8_t TWIReadData(uint8_t TWIaddr, uint8_t bytesToRead, uint8_t repStart)
+{
+	// Check if number of bytes to read can fit in the RXbuffer
+	if (bytesToRead < RXMAXBUFLEN)
+	{
+		// Reset buffer index and set RXBuffLen to the number of bytes to read
+		RXBuffIndex = 0;
+		RXBuffLen = bytesToRead;
+		// Create the one value array for the address to be transmitted
+		uint8_t TXdata[1];
+		// Shift the address and AND a 1 into the read write bit (set to write mode)
+		TXdata[0] = (TWIaddr << 1) | 0x01;
+		// Use the TWITransmitData function to initialize the transfer and address the slave
+		TWITransmitData(TXdata, 1, repStart);
+	}
+	else
+	{
+		return 0;
+	}
+	return 1;
+}
+
+ISR (TWI_vect)
+{
+	switch (TWI_STATUS)
+	{
+		// ----\/ ---- MASTER TRANSMITTER OR WRITING ADDRESS ----\/ ----  //
+		case TWI_MT_SLAW_ACK: // SLA+W transmitted and ACK received
+		// Set mode to Master Transmitter
+		TWIInfo.mode = MasterTransmitter;
+		case TWI_START_SENT: // Start condition has been transmitted
+		case TWI_MT_DATA_ACK: // Data byte has been transmitted, ACK received
+			if (TXBuffIndex < TXBuffLen) // If there is more data to send
+			{
+				TWDR = TWITransmitBuffer[TXBuffIndex++]; // Load data to transmit buffer
+				TWIInfo.errorCode = TWI_NO_RELEVANT_INFO;
+				TWISendTransmit(); // Send the data
+			}
+			// This transmission is complete however do not release bus yet
+			else if (TWIInfo.repStart)
+			{
+				TWIInfo.errorCode = 0xFF;
+				TWISendStart();
+			}
+			// All transmissions are complete, exit
+			else
+			{
+				TWIInfo.mode = Ready;
+				TWIInfo.errorCode = 0xFF;
+				TWISendStop();
+			}
+			break;
+		
+		// ----\/ ---- MASTER RECEIVER ----\/ ----  //
+		
+		case TWI_MR_SLAR_ACK: // SLA+R has been transmitted, ACK has been received
+			// Switch to Master Receiver mode
+			TWIInfo.mode = MasterReceiver;
+			// If there is more than one byte to be read, receive data byte and return an ACK
+			if (RXBuffIndex < RXBuffLen-1)
+			{
+				TWIInfo.errorCode = TWI_NO_RELEVANT_INFO;
+				TWISendACK();
+			}
+			// Otherwise when a data byte (the only data byte) is received, return NACK
+			else
+			{
+				TWIInfo.errorCode = TWI_NO_RELEVANT_INFO;
+				TWISendNACK();
+			}
+			break;
+		
+		case TWI_MR_DATA_ACK: // Data has been received, ACK has been transmitted.
+		
+			/// -- HANDLE DATA BYTE --- ///
+			TWIReceiveBuffer[RXBuffIndex++] = TWDR;
+			// If there is more than one byte to be read, receive data byte and return an ACK
+			if (RXBuffIndex < RXBuffLen-1)
+			{
+				TWIInfo.errorCode = TWI_NO_RELEVANT_INFO;
+				TWISendACK();
+			}
+			// Otherwise when a data byte (the only data byte) is received, return NACK
+			else
+			{
+				TWIInfo.errorCode = TWI_NO_RELEVANT_INFO;
+				TWISendNACK();
+			}
+			break;
+		
+		case TWI_MR_DATA_NACK: // Data byte has been received, NACK has been transmitted. End of transmission.
+		
+			/// -- HANDLE DATA BYTE --- ///
+			TWIReceiveBuffer[RXBuffIndex++] = TWDR;	
+			// This transmission is complete however do not release bus yet
+			if (TWIInfo.repStart)
+			{
+				TWIInfo.errorCode = 0xFF;
+				TWISendStart();
+			}
+			// All transmissions are complete, exit
+			else
+			{
+				TWIInfo.mode = Ready;
+				TWIInfo.errorCode = 0xFF;
+				TWISendStop();
+			}
+			break;
+		
+		// ----\/ ---- MT and MR common ----\/ ---- //
+		
+		case TWI_MR_SLAR_NACK: // SLA+R transmitted, NACK received
+		case TWI_MT_SLAW_NACK: // SLA+W transmitted, NACK received
+		case TWI_MT_DATA_NACK: // Data byte has been transmitted, NACK received
+		case TWI_LOST_ARBIT: // Arbitration has been lost
+			// Return error and send stop and set mode to ready
+			if (TWIInfo.repStart)
+			{				
+				TWIInfo.errorCode = TWI_STATUS;
+				TWISendStart();
+			}
+			// All transmissions are complete, exit
+			else
+			{
+				TWIInfo.mode = Ready;
+				TWIInfo.errorCode = TWI_STATUS;
+				TWISendStop();
+			}
+			break;
+		case TWI_REP_START_SENT: // Repeated start has been transmitted
+			// Set the mode but DO NOT clear TWINT as the next data is not yet ready
+			TWIInfo.mode = RepeatedStartSent;
+			break;
+		
+		// ----\/ ---- SLAVE RECEIVER ----\/ ----  //
+		
+		// TODO  IMPLEMENT SLAVE RECEIVER FUNCTIONALITY
+		
+		// ----\/ ---- SLAVE TRANSMITTER ----\/ ----  //
+		
+		// TODO  IMPLEMENT SLAVE TRANSMITTER FUNCTIONALITY
+		
+		// ----\/ ---- MISCELLANEOUS STATES ----\/ ----  //
+		case TWI_NO_RELEVANT_INFO: // It is not really possible to get into this ISR on this condition
+								   // Rather, it is there to be manually set between operations
+			break;
+		case TWI_ILLEGAL_START_STOP: // Illegal START/STOP, abort and return error
+			TWIInfo.errorCode = TWI_ILLEGAL_START_STOP;
+			TWIInfo.mode = Ready;
+			TWISendStop();
+			break;
+	}
+	
+}