hoverboard-firmware-hack-fo.../02_Arduino/hoverserial/hoverserial.ino

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// *******************************************************************
// Arduino Nano 3.3V example code
// for https://github.com/EmanuelFeru/hoverboard-firmware-hack-FOC
//
// Copyright (C) 2019-2020 Emanuel FERU <aerdronix@gmail.com>
//
// *******************************************************************
// INFO:
// • This sketch uses the the Serial Software interface to communicate and send commands to the hoverboard
// • The built-in (HW) Serial interface is used for debugging and visualization. In case the debugging is not needed,
// it is recommended to use the built-in Serial interface for full speed perfomace.
// • The data packaging includes a Start Frame, checksum, and re-syncronization capability for reliable communication
//
// CONFIGURATION on the hoverboard side in config.h:
// • Option 1: Serial on Left Sensor cable (long wired cable)
// #define CONTROL_SERIAL_USART2
// #define FEEDBACK_SERIAL_USART2
// // #define DEBUG_SERIAL_USART2
// • Option 2: Serial on Right Sensor cable (short wired cable) - recommended, so the ADCs on the other cable are still available
// #define CONTROL_SERIAL_USART3
// #define FEEDBACK_SERIAL_USART3
// // #define DEBUG_SERIAL_USART3
// *******************************************************************
// ########################## DEFINES ##########################
#define HOVER_SERIAL_BAUD 38400 // [-] Baud rate for HoverSerial (used to communicate with the hoverboard)
#define SERIAL_BAUD 115200 // [-] Baud rate for built-in Serial (used for the Serial Monitor)
#define START_FRAME 0xAAAA // [-] Start frme definition for reliable serial communication
#define TIME_SEND 100 // [ms] Sending time interval
#define SPEED_MAX_TEST 300 // [-] Maximum speed for testing
//#define DEBUG_RX // [-] Debug received data. Prints all bytes to serial (comment-out to disable)
#include <SoftwareSerial.h>
SoftwareSerial HoverSerial(2,3); // RX, TX
// Global variables
uint8_t idx = 0; // Index for new data pointer
uint16_t bufStartFrame; // Buffer Start Frame
byte *p; // Pointer declaration for the new received data
byte incomingByte;
byte incomingBytePrev;
typedef struct{
uint16_t start;
int16_t steer;
int16_t speed;
uint16_t checksum;
} SerialCommand;
SerialCommand Command;
typedef struct{
uint16_t start;
int16_t cmd1;
int16_t cmd2;
int16_t speedR;
int16_t speedL;
int16_t speedR_meas;
int16_t speedL_meas;
int16_t batVoltage;
int16_t boardTemp;
int16_t checksum;
} SerialFeedback;
SerialFeedback Feedback;
SerialFeedback NewFeedback;
// ########################## SETUP ##########################
void setup()
{
Serial.begin(SERIAL_BAUD);
Serial.println("Hoverboard Serial v1.0");
HoverSerial.begin(HOVER_SERIAL_BAUD);
pinMode(LED_BUILTIN, OUTPUT);
}
// ########################## SEND ##########################
void Send(int16_t uSteer, int16_t uSpeed)
{
// Create command
Command.start = (uint16_t)START_FRAME;
Command.steer = (int16_t)uSteer;
Command.speed = (int16_t)uSpeed;
Command.checksum = (uint16_t)(Command.start ^ Command.steer ^ Command.speed);
// Write to Serial
HoverSerial.write((uint8_t *) &Command, sizeof(Command));
}
// ########################## RECEIVE ##########################
void Receive()
{
// Check for new data availability in the Serial buffer
if (HoverSerial.available()) {
incomingByte = HoverSerial.read(); // Read the incoming byte
bufStartFrame = ((uint16_t)(incomingBytePrev) << 8) + incomingByte; // Construct the start marker
}
else {
return;
}
// If DEBUG_RX is defined print all incoming bytes
#ifdef DEBUG_RX
Serial.print(incomingByte);
return;
#endif
// Copy received data
if (bufStartFrame == START_FRAME) { // Initialize if new data is detected
p = (byte *)&NewFeedback;
*p++ = incomingBytePrev;
*p++ = incomingByte;
idx = 2;
} else if (idx >= 2 && idx < sizeof(SerialFeedback)) { // Save the new received data
*p++ = incomingByte;
idx++;
}
// Check if we reached the end of the package
if (idx == sizeof(SerialFeedback)) {
uint16_t checksum;
checksum = NewFeedback.start ^ NewFeedback.cmd1 ^ NewFeedback.cmd2 ^ NewFeedback.speedR ^ NewFeedback.speedL
^ NewFeedback.speedR_meas ^ NewFeedback.speedL_meas ^ NewFeedback.batVoltage ^ NewFeedback.boardTemp;
// Check validity of the new data
if (NewFeedback.start == START_FRAME && checksum == NewFeedback.checksum) {
// Copy the new data
memcpy(&Feedback, &NewFeedback, sizeof(SerialFeedback));
// Print data to built-in Serial
Serial.print("1: "); Serial.print(Feedback.cmd1);
Serial.print(" 2: "); Serial.print(Feedback.cmd2);
Serial.print(" 3: "); Serial.print(Feedback.speedR);
Serial.print(" 4: "); Serial.print(Feedback.speedL);
Serial.print(" 5: "); Serial.print(Feedback.speedR_meas);
Serial.print(" 6: "); Serial.print(Feedback.speedL_meas);
Serial.print(" 7: "); Serial.print(Feedback.batVoltage);
Serial.print(" 8: "); Serial.println(Feedback.boardTemp);
} else {
Serial.println("Non-valid data skipped");
}
idx = 0; // Reset the index (it prevents to enter in this if condition in the next cycle)
}
// Update previous states
incomingBytePrev = incomingByte;
}
// ########################## LOOP ##########################
unsigned long iTimeSend = 0;
int iTestMax = SPEED_MAX_TEST;
int iTest = 0;
void loop(void)
{
unsigned long timeNow = millis();
// Check for new received data
Receive();
// Send commands
if (iTimeSend > timeNow) return;
iTimeSend = timeNow + TIME_SEND;
Send(0, abs(iTest));
// Calculate test command signal
iTest += 10;
if (iTest > iTestMax) iTest = -iTestMax;
// Blink the LED
digitalWrite(LED_BUILTIN, (timeNow%2000)<1000);
}
// ########################## END ##########################