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mindflex
Dependencies: mbed Arduino millis
Brain.cpp
- Committer:
- harrisonstatham
- Date:
- 2018-10-11
- Revision:
- 1:c8dd92fc8aa8
- Parent:
- 0:6466440bff3a
File content as of revision 1:c8dd92fc8aa8:
#include "mbed.h" #include "Brain.h" Brain::Brain(Stream &_brainStream) { brainStream = &_brainStream; // Keep the rest of the initialization process in a separate method in case // we overload the constructor. init(); } void Brain::init() { // It's up to the calling code to start the stream // Usually Serial.begin(9600); freshPacket = false; inPacket = false; packetIndex = 0; packetLength = 0; eegPowerLength = 0; hasPower = false; checksum = 0; checksumAccumulator = 0; signalQuality = 200; attention = 0; meditation = 0; clearEegPower(); } boolean Brain::update() { if (brainStream->available()) { latestByte = brainStream->read(); // Build a packet if we know we're and not just listening for sync bytes. if (inPacket) { // First byte after the sync bytes is the length of the upcoming packet. if (packetIndex == 0) { packetLength = latestByte; // Catch error if packet is too long if (packetLength > MAX_PACKET_LENGTH) { // Packet exceeded max length // Send an error sprintf(latestError, "ERROR: Packet too long %i", packetLength); inPacket = false; } } else if (packetIndex <= packetLength) { // Run of the mill data bytes. // Print them here // Store the byte in an array for parsing later. packetData[packetIndex - 1] = latestByte; // Keep building the checksum. checksumAccumulator += latestByte; } else if (packetIndex > packetLength) { // We're at the end of the data payload. // Check the checksum. checksum = latestByte; checksumAccumulator = 255 - checksumAccumulator; // Do they match? if (checksum == checksumAccumulator) { boolean parseSuccess = parsePacket(); if (parseSuccess) { freshPacket = true; } else { // Parsing failed, send an error. sprintf(latestError, "ERROR: Could not parse"); // good place to print the packet if debugging } } else { // Checksum mismatch, send an error. sprintf(latestError, "ERROR: Checksum"); // good place to print the packet if debugging } // End of packet // Reset, prep for next packet inPacket = false; } packetIndex++; } // Look for the start of the packet if ((latestByte == 170) && (lastByte == 170) && !inPacket) { // Start of packet inPacket = true; packetIndex = 0; checksumAccumulator = 0; } // Keep track of the last byte so we can find the sync byte pairs. lastByte = latestByte; } if (freshPacket) { freshPacket = false; return true; } else { return false; } } void Brain::clearPacket() { for (uint8_t i = 0; i < MAX_PACKET_LENGTH; i++) { packetData[i] = 0; } } void Brain::clearEegPower() { // Zero the power bands. for(uint8_t i = 0; i < EEG_POWER_BANDS; i++) { eegPower[i] = 0; } } boolean Brain::parsePacket() { // Loop through the packet, extracting data. // Based on mindset_communications_protocol.pdf from the Neurosky Mindset SDK. // Returns true if passing succeeds hasPower = false; boolean parseSuccess = true; int rawValue = 0; clearEegPower(); // clear the eeg power to make sure we're honest about missing values for (uint8_t i = 0; i < packetLength; i++) { switch (packetData[i]) { case 0x2: signalQuality = packetData[++i]; break; case 0x4: attention = packetData[++i]; break; case 0x5: meditation = packetData[++i]; break; case 0x83: // ASIC_EEG_POWER: eight big-endian 3-uint8_t unsigned integer values representing delta, theta, low-alpha high-alpha, low-beta, high-beta, low-gamma, and mid-gamma EEG band power values // The next uint8_t sets the length, usually 24 (Eight 24-bit numbers... big endian?) // We dont' use this value so let's skip it and just increment i i++; // Extract the values for (int j = 0; j < EEG_POWER_BANDS; j++) { eegPower[j] = ((uint32_t)packetData[++i] << 16) | ((uint32_t)packetData[++i] << 8) | (uint32_t)packetData[++i]; } hasPower = true; // This seems to happen once during start-up on the force trainer. Strange. Wise to wait a couple of packets before // you start reading. break; case 0x80: // We dont' use this value so let's skip it and just increment i // uint8_t packetLength = packetData[++i]; i++; rawValue = ((int)packetData[++i] << 8) | packetData[++i]; break; default: // Broken packet ? /* Serial.print(F("parsePacket UNMATCHED data 0x")); Serial.print(packetData[i], HEX); Serial.print(F(" in position ")); Serial.print(i, DEC); printPacket(); */ parseSuccess = false; break; } } return parseSuccess; } // Keeping this around for debug use void Brain::printCSV() { // Print the CSV over serial brainStream->print(signalQuality, DEC); brainStream->print(","); brainStream->print(attention, DEC); brainStream->print(","); brainStream->print(meditation, DEC); if (hasPower) { for(int i = 0; i < EEG_POWER_BANDS; i++) { brainStream->print(","); brainStream->print(eegPower[i], DEC); } } brainStream->println(""); } char* Brain::readErrors() { return latestError; } char* Brain::readCSV() { // spit out a big string? // find out how big this really needs to be // should be popped off the stack once it goes out of scope? // make the character array as small as possible if(hasPower) { sprintf(csvBuffer,"%d,%d,%d,%lu,%lu,%lu,%lu,%lu,%lu,%lu,%lu", signalQuality, attention, meditation, eegPower[0], eegPower[1], eegPower[2], eegPower[3], eegPower[4], eegPower[5], eegPower[6], eegPower[7] ); return csvBuffer; } else { sprintf(csvBuffer,"%d,%d,%d", signalQuality, attention, meditation ); return csvBuffer; } } // For debugging, print the entire contents of the packet data array. void Brain::printPacket() { brainStream->print("["); for (uint8_t i = 0; i < MAX_PACKET_LENGTH; i++) { brainStream->print(packetData[i], DEC); if (i < MAX_PACKET_LENGTH - 1) { brainStream->print(", "); } } brainStream->println("]"); } void Brain::printDebug() { brainStream->println(""); brainStream->println("--- Start Packet ---"); brainStream->print("Signal Quality: "); brainStream->println(signalQuality, DEC); brainStream->print("Attention: "); brainStream->println(attention, DEC); brainStream->print("Meditation: "); brainStream->println(meditation, DEC); if (hasPower) { brainStream->println(""); brainStream->println("EEG POWER:"); brainStream->print("Delta: "); brainStream->println(eegPower[0], DEC); brainStream->print("Theta: "); brainStream->println(eegPower[1], DEC); brainStream->print("Low Alpha: "); brainStream->println(eegPower[2], DEC); brainStream->print("High Alpha: "); brainStream->println(eegPower[3], DEC); brainStream->print("Low Beta: "); brainStream->println(eegPower[4], DEC); brainStream->print("High Beta: "); brainStream->println(eegPower[5], DEC); brainStream->print("Low Gamma: "); brainStream->println(eegPower[6], DEC); brainStream->print("Mid Gamma: "); brainStream->println(eegPower[7], DEC); } brainStream->println(""); brainStream->print("Checksum Calculated: "); brainStream->println(checksumAccumulator, DEC); brainStream->print("Checksum Expected: "); brainStream->println(checksum, DEC); brainStream->println("--- End Packet ---"); brainStream->println(""); } uint8_t Brain::readSignalQuality() { return signalQuality; } uint8_t Brain::readAttention() { return attention; } uint8_t Brain::readMeditation() { return meditation; } uint32_t* Brain::readPowerArray() { return eegPower; } uint32_t Brain::readDelta() { return eegPower[0]; } uint32_t Brain::readTheta() { return eegPower[1]; } uint32_t Brain::readLowAlpha() { return eegPower[2]; } uint32_t Brain::readHighAlpha() { return eegPower[3]; } uint32_t Brain::readLowBeta() { return eegPower[4]; } uint32_t Brain::readHighBeta() { return eegPower[5]; } uint32_t Brain::readLowGamma() { return eegPower[6]; } uint32_t Brain::readMidGamma() { return eegPower[7]; }