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// **********************************************************************************************************
// MightyHat gateway base unit sketch that works with MightyHat equipped with RFM69W/RFM69HW/RFM69CW/RFM69HCW
// This will relay all RF data over serial to the host computer (RaspberryPi, PC etc) and vice versa
// http://LowPowerLab.com/MightyHat
// Also see http://LowPowerLab.com/gateway
// **********************************************************************************
// Copyright Felix Rusu 2016, http://www.LowPowerLab.com/contact
// **********************************************************************************
// License
// **********************************************************************************
// This program is free software; you can redistribute it
// and/or modify it under the terms of the GNU General
// Public License as published by the Free Software
// Foundation; either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will
// be useful, but WITHOUT ANY WARRANTY; without even the
// implied warranty of MERCHANTABILITY or FITNESS FOR A
// PARTICULAR PURPOSE. See the GNU General Public
// License for more details.
//
// Licence can be viewed at
// http://www.gnu.org/licenses/gpl-3.0.txt
//
// Please maintain this license information along with authorship
// and copyright notices in any redistribution of this code
// **********************************************************************************
#define MHAT_VERSION 3 //latest version is R3, change to "2" if you have a MightyHat R2
// ****************************************************************************************
#include <RFM69.h> //get it here: https://github.com/lowpowerlab/rfm69
#include <RFM69_ATC.h> //get it here: https://github.com/lowpowerlab/RFM69
#include <RFM69_OTA.h> //get it here: https://github.com/lowpowerlab/RFM69
#include <SPIFlash.h> //get it here: https://github.com/lowpowerlab/spiflash
#include <SPI.h> //included with Arduino IDE (www.arduino.cc)
#include "U8glib.h" //https://bintray.com/olikraus/u8glib/Arduino
//u8g compared to adafruit lib: https://www.youtube.com/watch?v=lkWZuAnHa2Y
//draing bitmaps: https://www.coconauts.net/blog/2015/01/19/easy-draw-bitmaps-arduino/
//****************************************************************************************************************
//**** IMPORTANT RADIO SETTINGS - YOU MUST CHANGE/CONFIGURE TO MATCH YOUR HARDWARE TRANSCEIVER CONFIGURATION! ****
//****************************************************************************************************************
#define NODEID 1 //the gateway has ID=1
#define NETWORKID 100 //all nodes on the same network can talk to each other
//#define FREQUENCY RF69_433MHZ //Match this with the version of your Moteino! (others: RF69_433MHZ, RF69_868MHZ)
#define FREQUENCY RF69_915MHZ //Match this with the version of your Moteino! (others: RF69_433MHZ, RF69_868MHZ)
//#define FREQUENCY_EXACT 917000000 //uncomment and set to a specific frequency in Hz, if commented the center frequency is used
#define ENCRYPTKEY "sampleEncryptKey" //has to be same 16 characters/bytes on all nodes, not more not less!
#define IS_RFM69HW_HCW //uncomment only for RFM69HW/HCW! Leave out if you have RFM69W/CW!
#define ENABLE_ATC //comment out this line to disable AUTO TRANSMISSION CONTROL //more here: http://lowpowerlab.com/blog/2015/11/11/rfm69_atc-automatic-transmission-control/
//#define ENABLE_WIRELESS_PROGRAMMING //comment out this line to disable Wireless Programming of this gateway node
#define ENABLE_LCD //comment this out if you don't have or don't want to use the LCD
//*****************************************************************************************************************************
#define ACK_TIME 30 // # of ms to wait for an ack
#define SERIAL_BAUD 19200
#define DEBUG_EN //comment out if you don't want any serial verbose output (keep out in real use)
#define BTN_LED_RED 9
#define BTN_LED_GRN 6 // This will indicate when Pi has power
#define POWER_LED_RED() { digitalWrite(BTN_LED_RED, HIGH); digitalWrite(BTN_LED_GRN, LOW); }
#define POWER_LED_GRN() { digitalWrite(BTN_LED_RED, LOW); digitalWrite(BTN_LED_GRN, HIGH); }
#define POWER_LED_ORANGE() { digitalWrite(BTN_LED_RED, HIGH); digitalWrite(BTN_LED_GRN, HIGH); }
#define POWER_LED_OFF() { digitalWrite(BTN_LED_RED, LOW); digitalWrite(BTN_LED_GRN, LOW); }
#define ON 1
#define OFF 0
#define FLASH_CS 8
#define BUZZER 5 // Buzzer attached to D5 (PWM pin required for tones)
#define BUTTON A2 // Power button pin
#define BUTTON1 A4 // Backlight control button
#define BUTTON2 A5 // Backlight control button
#define LATCH_EN 4
#define LATCH_VAL 7
#define SIG_SHUTOFF A3 // Signal to Pi to ask for a shutdown
#define SIG_BOOTOK A6 // Signal from Pi that it's OK to cutoff power
// !!NOTE!! Originally this was D7 but it was moved to A0 at least temporarily.
// On MightyBoost R1 you need to connect D7 and A0 with a jumper wire.
// The explanation for this is given here: http://lowpowerlab.com/mightyboost/#source
#define BATTERYSENSE A7 // Sense VBAT_COND signal (when powered externally should read ~3.25v/3.3v (1000-1023), when external power is cutoff it should start reading around 2.85v/3.3v * 1023 ~= 880 (ratio given by 10k+4.7K divider from VBAT_COND = 1.47 multiplier)
// hence the actual input voltage = analogRead(A7) * 0.00322 (3.3v/1024) * 1.47 (10k+4.7k voltage divider ratio)
// when plugged in this should be 4.80v, nothing to worry about
// when on battery power this should decrease from 4.15v (fully charged Lipoly) to 3.3v (discharged Lipoly)
// trigger a shutdown to the target device once voltage is around 3.4v to allow 30sec safe shutdown
#define BATTERY_VOLTS(analog_reading) analog_reading * 0.00322 * 1.51 // 100/66 is the inverse ratio of the voltage divider ( Batt > 1MEG > A7 > 2MEG > GND )
#define LOWBATTERYTHRESHOLD 3.5 // a shutdown will be triggered to the target device when battery voltage drops below this (Volts)
#define CHARGINGTHRESHOLD 4.3
#define RESETHOLDTIME 500 // Button must be hold this many mseconds before a reset is issued (should be much less than SHUTDOWNHOLDTIME)
#define SHUTDOWNHOLDTIME 2000 // Button must be hold this many mseconds before a shutdown sequence is started (should be much less than ForcedShutoffDelay)
#define ShutoffTriggerDelay 6000 // will start checking the SIG_BOOTOK line after this long
#define RESETPULSETIME 500 // When reset is issued, the SHUTOFF signal is held HIGH this many ms
#define ForcedShutoffDelay 7500 // when SIG_BOOTOK==0 (PI in unknown state): if button is held
// for this long, force shutdown (this should be less than RecycleTime)
#define ShutdownFinalDelay 4500 // after shutdown signal is received, delay for this long
// to allow all PI LEDs to stop activity (pulse LED faster)
#define RecycleTime 60000 // window of time in which SIG_BOOTOK is expected to go HIGH
// should be at least 3000 more than Min
// if nothing happens after this window, if button is
// still pressed, force cutoff power, otherwise switch back to normal ON state
#define BATTERYREADINTERVAL 2000
#ifdef DEBUG_EN
#define DEBUG(input) Serial.print(input)
#define DEBUGln(input) Serial.println(input)
#else
#define DEBUG(input)
#define DEBUGln(input)
#endif
//general variables
byte ackCount=0;
String inputstr;
byte inputLen=0;
char RSSIstr[] = "-100dBm";
char temp[64];
byte lastValidReading = 1;
unsigned long lastValidReadingTime = 0;
unsigned long NOW=0;
byte PowerState = OFF;
long lastPeriod = -1;
int rssi=0;
float systemVoltage = 5;
float systemVoltagePrevious = 5;
boolean batteryLow=false;
boolean batteryLowShutdown=false;
SPIFlash flash(FLASH_CS, 0xEF30); //EF30 for 4mbit Windbond FLASH MEM
#ifdef ENABLE_ATC
RFM69_ATC radio;
#else
RFM69 radio;
#endif
//******************************************** BEGIN LCD STUFF ********************************************************************************
char lcdbuff[80];
#ifdef ENABLE_LCD
#if defined(MHAT_VERSION) && (MHAT_VERSION == 3)
#define PIN_LCD_CS A1 //Pin 2 on LCD, lcd CS is shared with Latch value pin since they are both outputs and never HIGH at the same time
#define PIN_LCD_RST U8G_PIN_NONE //this is tied directly to the atmega RST
#else
#define PIN_LCD_CS LATCH_VAL //Pin 2 on LCD, lcd CS is shared with Latch value pin since they are both outputs and never HIGH at the same time
#define PIN_LCD_RST A1 //Pin 1 on LCD
#endif
#define PIN_LCD_DC A0 //Pin 3 on LCD
#define PIN_LCD_LIGHT 3 //Backlight pin
#define xbmp_logo_width 30
#define xbmp_logo_height 27
#define BACKLIGHTLEVELS 5 //5 levels gives a nice round number that allows full brightness
void LCD_BACKLIGHT(byte level) { if (level>BACKLIGHTLEVELS) level=BACKLIGHTLEVELS; analogWrite(PIN_LCD_LIGHT, 255-level*255/BACKLIGHTLEVELS); }
byte backlightLevel=BACKLIGHTLEVELS; //max at startup
const uint8_t xbmp_logo[] PROGMEM = {
0xe0, 0xff, 0xff, 0x01, 0xf0, 0xff, 0xff, 0x03, 0x08, 0x00, 0x00, 0x04,
0x06, 0x00, 0x00, 0x18, 0xc3, 0x03, 0xf0, 0x30, 0x23, 0x04, 0x08, 0x31,
0x23, 0x04, 0x08, 0x31, 0x23, 0x0c, 0x0c, 0x31, 0xc3, 0x13, 0xf2, 0x30,
0x03, 0xe0, 0x01, 0x30, 0x03, 0xe0, 0x01, 0x30, 0xc3, 0xe3, 0xf1, 0x30,
0x23, 0xe4, 0x09, 0x31, 0x23, 0xfc, 0x0f, 0x31, 0x23, 0xe4, 0x09, 0x31,
0xc3, 0xe3, 0xf1, 0x30, 0x03, 0xe0, 0x01, 0x30, 0x03, 0xe0, 0x01, 0x30,
0xc3, 0x13, 0xf2, 0x30, 0x23, 0x0c, 0x0c, 0x31, 0x23, 0x04, 0x08, 0x31,
0x23, 0x04, 0x08, 0x31, 0xc3, 0x03, 0xf0, 0x30, 0x06, 0x00, 0x00, 0x18,
0x08, 0x00, 0x00, 0x04, 0xf0, 0xff, 0xff, 0x03, 0xe0, 0xff, 0xff, 0x01 };
#define xbmp_batt_width 9
#define xbmp_batt_height 6
const uint8_t xbmp_batt_c[] PROGMEM = { 0xff, 0x00, 0xbf, 0x00, 0x9f, 0x01, 0x8f, 0x01, 0x87, 0x00, 0xff, 0x00 };
const uint8_t xbmp_batt_x[] PROGMEM = { 0xff, 0x00, 0xa5, 0x00, 0x81, 0x01, 0x99, 0x01, 0xa5, 0x00, 0xff, 0x00 };
const uint8_t xbmp_batt_0[] PROGMEM = { };
const uint8_t xbmp_batt_1[] PROGMEM = { 0xff, 0x00, 0x83, 0x00, 0x83, 0x01, 0x83, 0x01, 0x83, 0x00, 0xff, 0x00 };
const uint8_t xbmp_batt_2[] PROGMEM = { 0xff, 0x00, 0x87, 0x00, 0x87, 0x01, 0x87, 0x01, 0x87, 0x00, 0xff, 0x00 };
const uint8_t xbmp_batt_3[] PROGMEM = { 0xff, 0x00, 0x8f, 0x00, 0x8f, 0x01, 0x8f, 0x01, 0x8f, 0x00, 0xff, 0x00 };
const uint8_t xbmp_batt_4[] PROGMEM = { 0xff, 0x00, 0x9f, 0x00, 0x9f, 0x01, 0x9f, 0x01, 0x9f, 0x00, 0xff, 0x00 };
const uint8_t xbmp_batt_5[] PROGMEM = { 0xff, 0x00, 0xbf, 0x00, 0xbf, 0x01, 0xbf, 0x01, 0xbf, 0x00, 0xff, 0x00 };
const uint8_t xbmp_batt_6[] PROGMEM = { 0xff, 0x00, 0xff, 0x00, 0xff, 0x01, 0xff, 0x01, 0xff, 0x00, 0xff, 0x00 };
#define xbmp_rssi_width 7
#define xbmp_rssi_height 6
const uint8_t xbmp_rssi_1[] PROGMEM = { 0x40, 0x10, 0x00, 0x04, 0x04, 0x05 };
const uint8_t xbmp_rssi_2[] PROGMEM = { 0x40, 0x10, 0x10, 0x14, 0x14, 0x15 };
const uint8_t xbmp_rssi_3[] PROGMEM = { 0x40, 0x50, 0x50, 0x54, 0x54, 0x55 };
const uint8_t xbmp_rssi_0[] PROGMEM = { 0x40, 0x10, 0x00, 0x04, 0x00, 0x01 };
U8GLIB_PCD8544 lcd(PIN_LCD_CS, PIN_LCD_DC, PIN_LCD_RST); //hardware SPI
//U8GLIB_PCD8544 lcd(SCK, MOSI, PIN_LCD_CS, PIN_LCD_DC , PIN_LCD_RST); //software SPI
//******************************************** LCD FUNCTIONS ********************************************************************************
void drawLogo() {
lcd.firstPage();
do {
lcd.drawXBMP((84-xbmp_logo_width)/2, (48-xbmp_logo_height)/2, xbmp_logo_width, xbmp_logo_height, xbmp_logo); //tutorial: https://www.coconauts.net/blog/2015/01/19/easy-draw-bitmaps-arduino/
} while(lcd.nextPage());
}
void clearDisplay() { lcd.firstPage(); do{}while(lcd.nextPage()); }
void refreshLCD() {
noInterrupts(); //while messing with LCD need to pause interrups from radio to avoid SPI conflicts!
byte lcdwidth = lcd.getWidth();
byte lcdheight = lcd.getHeight();
char c;
byte i,pos,swidth;
byte * bmpPtr;
//u8glib picture loop
lcd.firstPage();
do {
lcd.setFont(u8g_font_profont10);
lcd.setFontRefHeightText();
lcd.setFontPosTop();
byte fontheight = lcd.getFontAscent()-lcd.getFontDescent();
char * textp = lcdbuff;
byte textLength = strlen(textp);
byte line=0;
byte done = false;
//this section splits the textp string into chunks that fit on the screen width and prints each to a new line
while(textLength && !done)
{
for (i=1;i<=textLength;i++)
{
c = textp[i];
textp[i]=0;
swidth = lcd.getStrWidth(textp);
textp[i] = c;
if (c=='\n') { pos = i; break; } //newline char found, skip it and go to next line
if (swidth > lcdwidth) { pos = i-1; break; } //line is full, go to next line
else if (i==textLength) { done = true; }
}
if (!done)
{
c = textp[pos];
textp[pos]=0;
}
lcd.drawStr(0, line * fontheight, textp);
if (done) break;
textp[pos] = c;
textp += pos;
textLength -= pos;
line++;
}
lcd.setFontPosBaseline();
//print battery voltage and icon
if (systemVoltage >= 4.3) bmpPtr = (byte*)xbmp_batt_c;
else if (systemVoltage >= 4) bmpPtr = (byte*)xbmp_batt_6;
else if (systemVoltage >= 3.9) bmpPtr = (byte*)xbmp_batt_5;
else if (systemVoltage >= 3.8) bmpPtr = (byte*)xbmp_batt_4;
else if (systemVoltage >= 3.7) bmpPtr = (byte*)xbmp_batt_3;
else if (systemVoltage >= 3.6) bmpPtr = (byte*)xbmp_batt_2;
else if (systemVoltage >= 3.5) bmpPtr = (byte*)xbmp_batt_1;
else bmpPtr = (byte*)xbmp_batt_x;
lcd.drawXBMP(lcdwidth-xbmp_batt_width, lcdheight-xbmp_batt_height, xbmp_batt_width, xbmp_batt_height, bmpPtr);
lcd.setPrintPos(54, 48);
if (systemVoltage >= CHARGINGTHRESHOLD)
lcd.print("CHRG");
else
lcd.print(systemVoltage); //sprintf(BATvstr, "%sv", BATstr);
lcd.setPrintPos(0, 40);
uint16_t uptimeSeconds = millis()/1000;
if (uptimeSeconds<60)
sprintf(temp, "up:%us", uptimeSeconds);
else
sprintf(temp, "up:%um", uptimeSeconds/60);
lcd.print(temp);
lcd.setPrintPos(45, 40);
sprintf(temp, "RAM:%u", checkFreeRAM());
lcd.print(temp);
//print rssi and icon
if (rssi > -70) bmpPtr = (byte*)xbmp_rssi_3;
else if (rssi > -80) bmpPtr = (byte*)xbmp_rssi_2;
else if (rssi > -90) bmpPtr = (byte*)xbmp_rssi_1;
else if (rssi > -95) bmpPtr = (byte*)xbmp_rssi_0;
lcd.drawXBMP(0, lcdheight-xbmp_rssi_height, xbmp_rssi_width, xbmp_rssi_height, bmpPtr);
lcd.drawStr(xbmp_rssi_width+1, 48, RSSIstr);
} while(lcd.nextPage());
digitalWrite(PIN_LCD_CS, HIGH);
interrupts(); //re-enable interrupts
}
#endif
//******************************************** END LCD STUFF ********************************************************************************
//******************************************** MESSAGE HISTORY ******************************************************************************
#define MSG_MAX_LEN 32 //truncate message at 32 chars since most are shorter than that anyway
#define HISTORY_LEN 10 //hold this many past messages (IMPORTANT: 10 records needs about 330 bytes of RAM so be careful about making this too large)
typedef struct {
char data[MSG_MAX_LEN];
int rssi;
} Message;
Message * messageHistory = new Message[HISTORY_LEN];
byte lastMessageIndex = HISTORY_LEN;
byte currMessageIndex = HISTORY_LEN;
byte historyLength = 0;
void saveToHistory(char * msg, int rssi)
{
byte length = strlen(msg);
byte i = 0;
if (lastMessageIndex >= HISTORY_LEN-1) lastMessageIndex = 0;
else lastMessageIndex++;
if (historyLength < HISTORY_LEN) historyLength++;
currMessageIndex = historyLength-1; //reset history pointer back to latest message
for (; i<(MSG_MAX_LEN-1) && (i < length); i++)
messageHistory[lastMessageIndex].data[i] = msg[i];
messageHistory[lastMessageIndex].data[i] = '\0'; //terminate string
messageHistory[lastMessageIndex].rssi = rssi;
}
//******************************************** END MESSAGE HISTORY **************************************************************************
//parse through any serial commands from the host (Pi)
void handleSerialInput() {
inputLen = readSerialLine(temp, 10, 64, 10); //readSerialLine(char* input, char endOfLineChar=10, byte maxLength=64, uint16_t timeout=10);
if (inputLen > 0)
{
DEBUG("GTWCMD:");DEBUGln(temp);
inputstr = String(temp);
inputstr.toUpperCase();
if (inputstr.equals("BEEP")) Beep(5, false);
if (inputstr.equals("BEEP2")) Beep(10, true);
if (inputstr.equals("RAM")) { DEBUG(F("Free RAM bytes: "));DEBUGln(checkFreeRAM()); }
if (inputstr.equals("KEY?")) { Serial.print(F("ENCRYPTKEY:"));Serial.println(ENCRYPTKEY); }
byte targetId = inputstr.toInt(); //extract ID if any
byte colonIndex = inputstr.indexOf(":"); //find position of first colon
if (targetId > 0) inputstr = inputstr.substring(colonIndex+1); //trim "ID:" if any
if (targetId > 0 && targetId != NODEID && targetId != RF69_BROADCAST_ADDR && colonIndex>0 && colonIndex<4 && inputstr.length()>0)
{
inputstr.getBytes((byte*)temp, 61);
if (radio.sendWithRetry(targetId, (byte*)temp, inputstr.length()))
DEBUGln(F("ACK:OK"));
else
DEBUGln(F("ACK:NOK"));
}
}
}
void Blink(byte PIN, int DELAY_MS)
{
pinMode(PIN, OUTPUT);
digitalWrite(PIN,HIGH);
delay(DELAY_MS);
digitalWrite(PIN,LOW);
}
void setupPowerControl(){
pinMode(BUTTON, INPUT_PULLUP);
pinMode(SIG_BOOTOK, INPUT);
pinMode(SIG_SHUTOFF, OUTPUT);
pinMode(BTN_LED_RED, OUTPUT);
pinMode(BTN_LED_GRN, OUTPUT);
pinMode(LATCH_EN, OUTPUT);
digitalWrite(LATCH_EN, LOW);
pinMode(PIN_LCD_CS, OUTPUT);
digitalWrite(PIN_LCD_CS, HIGH);
pinMode(LATCH_VAL, OUTPUT);
pinMode(BUTTON1, INPUT_PULLUP);
pinMode(BUTTON2, INPUT_PULLUP);
pinMode(BATTERYSENSE, INPUT);
digitalWrite(SIG_SHUTOFF, LOW);//added after sudden shutdown quirks, DO NOT REMOVE!
}
void handlePowerControl() {
byte reading = digitalRead(BUTTON);
NOW = millis();
digitalWrite(SIG_SHUTOFF, LOW);//added after sudden shutdown quirks, DO NOT REMOVE!
//artificial power ON after a low battery shutdown
if (PowerState == OFF && batteryLowShutdown && systemVoltage >= CHARGINGTHRESHOLD)
reading = HIGH;
if ((PowerState == ON && batteryLow) || (reading != lastValidReading && NOW - lastValidReadingTime > 200))
{
lastValidReading = reading;
lastValidReadingTime = NOW;
if ((PowerState == ON && batteryLow) || reading == LOW)
{
radio.sleep();
//make sure the button is held down for at least 'RESETHOLDTIME' before taking action (this is to avoid accidental button presses and consequently Pi shutdowns)
NOW = millis();
while (!batteryLow && (PowerState == ON && millis()-NOW < RESETHOLDTIME)) { delay(10); if (digitalRead(BUTTON) != 0) return; }
//RESETHOLDTIME is satisfied, now check if button still held until SHUTDOWNHOLDTIME is satisfied
POWER_LED_ORANGE(); //make the button LED orange to show something's going on
while (!batteryLow && (PowerState == ON && millis()-NOW < SHUTDOWNHOLDTIME))
{
if (digitalRead(BUTTON) != 0)
{
if (BOOTOK()) //SIG_BOOTOK is HIGH so Pi is running the shutdowncheck.sh script, ready to intercept the RESET PULSE
{
#ifdef ENABLE_LCD
sprintf(lcdbuff, "Rebooting Pi..");
refreshLCD();
#endif
digitalWrite(SIG_SHUTOFF, HIGH);
delay(RESETPULSETIME);
digitalWrite(SIG_SHUTOFF, LOW);
NOW = millis();
boolean recycleDetected=false;
while (millis()-NOW < RecycleTime) //blink LED while waiting for BOOTOK to go high
{
//blink 3 times and pause
POWER_LED_OFF(); //digitalWrite(POWER_LED, LOW);
delay(100);
POWER_LED_ORANGE(); //digitalWrite(POWER_LED, HIGH);
delay(100);
POWER_LED_OFF(); //digitalWrite(POWER_LED, LOW);
delay(100);
POWER_LED_ORANGE(); //digitalWrite(POWER_LED, HIGH);
delay(100);
POWER_LED_OFF(); //digitalWrite(POWER_LED, LOW);
delay(100);
POWER_LED_ORANGE(); //digitalWrite(POWER_LED, HIGH);
delay(500);
if (!BOOTOK()) recycleDetected = true;
else if (BOOTOK() && recycleDetected)
{
#ifdef ENABLE_LCD
sprintf(lcdbuff, "Reboot OK!");
refreshLCD();
#endif
return;
}
}
return; //reboot pulse sent but it appears a reboot failed; exit all checks
}
else return; //ignore everything else (button was held for RESETHOLDTIME, but SIG_BOOTOK was LOW)
}
}
//SIG_BOOTOK must be HIGH when Pi is ON. During boot, this will take a while to happen (till it executes the "shutdowncheck" script)
//so I dont want to cutoff power before it had a chance to fully boot up
if ((batteryLow || PowerState == ON) && BOOTOK())
{
if (batteryLow) {
#ifdef ENABLE_LCD
sprintf(lcdbuff, "Battery low! Shutting down Pi..");
#endif
batteryLowShutdown = true;
}
#ifdef ENABLE_LCD
else
sprintf(lcdbuff, "Shutting down Pi..");
refreshLCD();
#endif
// signal Pi to shutdown
digitalWrite(SIG_SHUTOFF, HIGH);
//DEBUGln("SIG_SHUTOFF - HIGH - if(batteryLow || (PowerState == 1 && BOOTOK())");
//now wait for the Pi to signal back
NOW = millis();
float in, out;
boolean forceShutdown = true;
POWER_LED_OFF();
while (millis()-NOW < RecycleTime)
{
if (in > 6.283) in = 0;
in += .00628;
out = sin(in) * 127.5 + 127.5;
analogWrite(BTN_LED_RED, out);
delayMicroseconds(1500);
//account for force-shutdown action (if button held for ForcedShutoffDelay, then force shutdown regardless)
if (millis()-NOW <= (ForcedShutoffDelay-SHUTDOWNHOLDTIME) && digitalRead(BUTTON) != 0)
forceShutdown = false;
if (millis()-NOW >= (ForcedShutoffDelay-SHUTDOWNHOLDTIME) && forceShutdown)
{
PowerState = OFF;
POWER_LED_OFF(); //digitalWrite(POWER_LED, PowerState); //turn off LED to indicate power is being cutoff
POWER(PowerState);
break;
}
if (millis() - NOW > ShutoffTriggerDelay)
{
// Pi signaling OK to turn off
if (!BOOTOK())
{
PowerState = OFF;
POWER_LED_OFF(); //digitalWrite(POWER_LED, PowerState); //turn off LED to indicate power is being cutoff
NOW = millis();
while (millis()-NOW < ShutdownFinalDelay)
{
if (in > 6.283) in = 0;
in += .00628;
out = sin(in) * 127.5 + 127.5;
analogWrite(BTN_LED_RED,out);
delayMicroseconds(300);
}
POWER(PowerState);
break;
}
}
}
// last chance: if power still on but button still pressed, force cutoff power
if (PowerState == ON && digitalRead(BUTTON) == 0)
{
PowerState = OFF;
POWER(PowerState);
}
#ifdef ENABLE_LCD
if (PowerState == OFF)
{
sprintf(lcdbuff, "Pi is now OFF");
refreshLCD();
}
#endif
digitalWrite(SIG_SHUTOFF, LOW);
//DEBUGln("SIG_SHUTOFF - LOW");
}
else if (PowerState == ON && !BOOTOK())
{
#ifdef ENABLE_LCD
sprintf(lcdbuff, "Forced shutdown..");
refreshLCD();
#endif
NOW = millis();
unsigned long NOW2 = millis();
int analogstep = 255 / ((ForcedShutoffDelay-SHUTDOWNHOLDTIME)/100); //every 500ms decrease LED intensity
while (digitalRead(BUTTON) == 0)
{
if (millis()-NOW2 > 100)
{
analogWrite(BTN_LED_RED, 255 - ((millis()-NOW)/100)*analogstep);
NOW2 = millis();
}
if (millis()-NOW > ForcedShutoffDelay-SHUTDOWNHOLDTIME)
{
//TODO: add blinking here to signal final shutdown delay
PowerState = OFF;
POWER(PowerState);
#ifdef ENABLE_LCD
sprintf(lcdbuff, "Pi is now OFF");
refreshLCD();
#endif
break;
}
}
}
else if (PowerState == OFF)
{
PowerState = ON;
batteryLowShutdown=false;
POWER(PowerState);
#ifdef ENABLE_LCD
sprintf(lcdbuff, "Pi is now ON");
refreshLCD();
#endif
}
}
if (PowerState == ON) POWER_LED_GRN() else POWER_LED_OFF(); //digitalWrite(POWER_LED, PowerState);
}
}
uint32_t buttonsLastChanged;
void handle2Buttons()
{
if (millis() - buttonsLastChanged < 200) return; //basic button debouncing & prevent changing level too fast
//button 1 - backlight
if (digitalRead(BUTTON1)==LOW)
{
buttonsLastChanged=millis();
Beep(3, false);
#ifdef ENABLE_LCD
if (backlightLevel==BACKLIGHTLEVELS) backlightLevel=0;
else backlightLevel++;
LCD_BACKLIGHT(backlightLevel);
sprintf(lcdbuff, "LCDlight:%d/100", 100*backlightLevel/BACKLIGHTLEVELS);
refreshLCD();
#endif
}
//button 2 - message history
if (digitalRead(BUTTON2)==LOW)
{
buttonsLastChanged=millis();
Beep(3, false);
if (historyLength > 0) //if at least 1 data packet was received and saved to history...
{
sprintf(RSSIstr, "%ddBm", messageHistory[currMessageIndex].rssi); //paint the history rssi string for the LCDRefresh
rssi = messageHistory[currMessageIndex].rssi; //save the history rssi for the LCDRefresh signal icon
#ifdef ENABLE_LCD
sprintf(lcdbuff, "<HISTORY[%d/%d]>\n%s", currMessageIndex+1, historyLength, messageHistory[currMessageIndex].data); //fill the LCD string buffer with the history data string
refreshLCD(); //paint the screen
#endif
if (currMessageIndex==0) currMessageIndex=historyLength-1; else currMessageIndex--; //this makes it cycle from the latest message towards oldest as you press BTN2
}
}
}
boolean BOOTOK() {
return analogRead(SIG_BOOTOK) > 800; //the BOOTOK signal is on an analog pin because a digital may not always pick it up (its less than 3.3v)
}
void POWER(uint8_t ON_OFF) {
digitalWrite(LATCH_EN, HIGH);
digitalWrite(LATCH_VAL, ON_OFF);
delay(5);
digitalWrite(LATCH_EN, LOW);
delay(5);
#ifdef ENABLE_LCD
digitalWrite(PIN_LCD_CS, HIGH); //if shared with LATCH_VAL, should be HIGH when not used by latch
#endif
}
void Beep(byte theDelay, boolean twoSounds)
{
if (theDelay > 20) theDelay = 20;
tone(BUZZER, 4200); //4200
delay(theDelay);
noTone(BUZZER);
delay(10);
if (twoSounds)
{
tone(BUZZER, 4500); //4500
delay(theDelay);
noTone(BUZZER);
}
}
int checkFreeRAM()
{
extern int __heap_start, *__brkval;
int v;
return (int) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval);
}
boolean readBattery() {
//periodically read the battery voltage
int currPeriod = millis()/BATTERYREADINTERVAL;
if (currPeriod != lastPeriod)
{
lastPeriod=currPeriod;
systemVoltage = BATTERY_VOLTS(analogRead(BATTERYSENSE));
//dtostrf(systemVoltage, 3,2, BATstr);
batteryLow = systemVoltage < LOWBATTERYTHRESHOLD;
return true; //signal that batt has been read
}
return false;
}
void setup() {
Beep(20, false);delay(50);Beep(20, false);delay(50);Beep(20, false);
setupPowerControl();
Serial.begin(SERIAL_BAUD);
radio.initialize(FREQUENCY,NODEID,NETWORKID);
radio.encrypt(ENCRYPTKEY);
#ifdef IS_RFM69HW_HCW
radio.setHighPower(); //must include this only for RFM69HW/HCW!
#endif
sprintf(lcdbuff, "Listening @ %dmhz...", FREQUENCY==RF69_433MHZ ? 433 : FREQUENCY==RF69_868MHZ ? 868 : 915);
DEBUGln(lcdbuff);
if (flash.initialize()) DEBUGln("SPI Flash Init OK!");
else DEBUGln(F("SPI Flash MEM FAIL!"));
#ifdef FREQUENCY_EXACT
radio.setFrequency(FREQUENCY_EXACT); //set frequency to some custom frequency
#endif
#ifdef ENABLE_ATC
DEBUGln(F("RFM69_ATC Enabled (Auto Transmission Control)"));
#endif
readBattery();
DEBUG(F("Free RAM bytes: "));DEBUG(checkFreeRAM());
#ifdef ENABLE_LCD
pinMode(PIN_LCD_LIGHT, OUTPUT); //LCD backlight, LOW = backlight ON
lcd.setRot180(); //rotate screen 180 degrees
lcd.setContrast(140); //120-160 seems to be usable range
drawLogo();
LCD_BACKLIGHT(backlightLevel);
delay(2000);
refreshLCD();
delay(1000);
#endif
}
boolean newPacketReceived;
void loop() {
handlePowerControl(); //checks any button presses and takes action
handle2Buttons(); //checks the general purpose buttons next to the LCD (R2+)
handleSerialInput(); //checks for any serial input from the Pi computer
//process any received radio packets
if (radio.receiveDone())
{
rssi = radio.RSSI;
if (radio.DATALEN > 0) //data packets have a payload
{
sprintf(lcdbuff, "[%d] %s", radio.SENDERID, radio.DATA);
sprintf(RSSIstr, "%ddBm", rssi);
Serial.print(lcdbuff); //this passes data to MightyHat / RaspberryPi
Serial.print(F(" [RSSI:"));Serial.print(rssi);Serial.print(']');
saveToHistory(lcdbuff, rssi);
}
//check if the packet is a wireless programming request
//removing this line will save 3kb+ of flash space
#ifdef ENABLE_WIRELESS_PROGRAMMING
CheckForWirelessHEX(radio, flash, false); //non verbose DEBUG
#endif
//respond to any ACK if requested
if (radio.ACKRequested())
{
radio.sendACK();
DEBUG(F("[ACK-sent]"));
}
//DEBUG(F("Free RAM bytes: "));DEBUG(checkFreeRAM());
Serial.println();
Blink(LED,2);
newPacketReceived = true;
}
readBattery();
#ifdef ENABLE_LCD
if (newPacketReceived || systemVoltagePrevious-systemVoltage > 0.01 || systemVoltagePrevious-systemVoltage < -0.1)
{
systemVoltagePrevious = systemVoltage;
newPacketReceived = false;
refreshLCD();
}
LCD_BACKLIGHT(batteryLow ? 0 : backlightLevel);
#endif
}
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