mDot / Mbed OS Honneywell_Dust_Simple

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Main.cpp@4:12dfd9a8ee76, 2017-08-07 (annotated)

Committer:
Roietronics
Date:
Mon Aug 07 23:36:40 2017 +0000
Revision:
4:12dfd9a8ee76
Parent:
3:1ba96949e2fd
Child:
5:7cabc36d4352
Debug trace;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Roietronics 1:8cad8f7852d4 1 /* Run Honeywell Dust Sensor in continous Sampling Mode on a mDot
Roietronics 3:1ba96949e2fd 2 Version 1.1
Roietronics 0:8326629a1b97 3 Steve Mylroie Roitronic August 1st 2017
Roietronics 0:8326629a1b97 4 @C Copyright Global Quality Corp
Roietronics 0:8326629a1b97 5 */
Roietronics 0:8326629a1b97 6
Roietronics 0:8326629a1b97 7 #include "mbed.h"
Roietronics 0:8326629a1b97 8 #include "stdlib.h"
Roietronics 0:8326629a1b97 9
Roietronics 4:12dfd9a8ee76 10 #define VERSION "1.2"
Roietronics 4:12dfd9a8ee76 11
Roietronics 4:12dfd9a8ee76 12
Roietronics 4:12dfd9a8ee76 13 #ifdef MDOT
Roietronics 4:12dfd9a8ee76 14 #define
Roietronics 4:12dfd9a8ee76 15 #define
Roietronics 4:12dfd9a8ee76 16 #define
Roietronics 4:12dfd9a8ee76 17 #define
Roietronics 4:12dfd9a8ee76 18 #endif
Roietronics 4:12dfd9a8ee76 19
Roietronics 4:12dfd9a8ee76 20 #ifdef FREEDOM
Roietronics 4:12dfd9a8ee76 21 #endif
Roietronics 4:12dfd9a8ee76 22
Roietronics 0:8326629a1b97 23 #define TRACE_MODE
Roietronics 0:8326629a1b97 24
Roietronics 0:8326629a1b97 25 //Turn on trace logging to the PC USB port
Roietronics 0:8326629a1b97 26 #ifdef TRACE_MODE
Roietronics 0:8326629a1b97 27 //Log level need to be set one level higher than the high level to be output
Roietronics 3:1ba96949e2fd 28 #define LOG_LEVEL 4
Roietronics 0:8326629a1b97 29 #define DEBUG
Roietronics 0:8326629a1b97 30 #endif
Roietronics 0:8326629a1b97 31
Roietronics 3:1ba96949e2fd 32
Roietronics 0:8326629a1b97 33 const uint8_t* measureCommand = "68014057";
Roietronics 0:8326629a1b97 34 const uint8_t* stopCommand = "68012077";
Roietronics 0:8326629a1b97 35
Roietronics 0:8326629a1b97 36 #define OK 0xA5A5
Roietronics 0:8326629a1b97 37 #define BAD 0x9696
Roietronics 0:8326629a1b97 38
Roietronics 0:8326629a1b97 39 #define MESSAGE_LEN 32
Roietronics 0:8326629a1b97 40 //sensor measurement cycle in millseconds
Roietronics 0:8326629a1b97 41 #define MEASURE_DELAY 1500
Roietronics 0:8326629a1b97 42
Roietronics 3:1ba96949e2fd 43 Serial pc(USBTX, USBRX, 115200);
Roietronics 3:1ba96949e2fd 44
Roietronics 0:8326629a1b97 45 //Use USB debug pott for the debug stream
Roietronics 0:8326629a1b97 46 #ifdef DEBUG
Roietronics 3:1ba96949e2fd 47 uint32_t debugLevel = LOG_LEVEL;
Roietronics 3:1ba96949e2fd 48 #else
Roietronics 3:1ba96949e2fd 49 uint32_t debugLevel = 0;
Roietronics 0:8326629a1b97 50 #endif
Roietronics 0:8326629a1b97 51
Roietronics 3:1ba96949e2fd 52 void logInfo(char* text) {
Roietronics 3:1ba96949e2fd 53 if ( debugLevel > 0 ) {
Roietronics 3:1ba96949e2fd 54 pc.printf("\n%s\n", text );
Roietronics 3:1ba96949e2fd 55 }
Roietronics 3:1ba96949e2fd 56 return;
Roietronics 3:1ba96949e2fd 57 }
Roietronics 3:1ba96949e2fd 58
Roietronics 3:1ba96949e2fd 59 void logTrace(uint8_t data) {
Roietronics 3:1ba96949e2fd 60 if (debugLevel > 2 ){ pc.putc( data );
Roietronics 3:1ba96949e2fd 61 }
Roietronics 3:1ba96949e2fd 62 return;
Roietronics 3:1ba96949e2fd 63 }
Roietronics 3:1ba96949e2fd 64
Roietronics 3:1ba96949e2fd 65
Roietronics 3:1ba96949e2fd 66 //Use second UART to communicate witb the Honneywell sensor
Roietronics 0:8326629a1b97 67 //Default UART setting are 8,N,1
Roietronics 4:12dfd9a8ee76 68 Serial sensor(D1, D0, 9600);
Roietronics 0:8326629a1b97 69
Roietronics 0:8326629a1b97 70 Timer t;
Roietronics 0:8326629a1b97 71
Roietronics 3:1ba96949e2fd 72
Roietronics 0:8326629a1b97 73 //synchrnous serial read and writes
Roietronics 0:8326629a1b97 74 //Mbed 5 Serial class only supports single character read and writes or
Roietronics 0:8326629a1b97 75 // async buffer reads abd wrutes
Roietronics 0:8326629a1b97 76 void readBuffer(uint8_t* buffer, uint16_t count)
Roietronics 0:8326629a1b97 77 {
Roietronics 3:1ba96949e2fd 78 logInfo( "Receiving Data from sensor");
Roietronics 0:8326629a1b97 79 uint8_t* pointer = buffer;
Roietronics 0:8326629a1b97 80 uint16_t counter = count;
Roietronics 0:8326629a1b97 81 while(1)
Roietronics 0:8326629a1b97 82 {
Roietronics 0:8326629a1b97 83 if(sensor.readable())
Roietronics 0:8326629a1b97 84 {
Roietronics 0:8326629a1b97 85 *pointer++ = sensor.getc();
Roietronics 3:1ba96949e2fd 86 logTrace(*pointer);
Roietronics 0:8326629a1b97 87 counter--;
Roietronics 0:8326629a1b97 88 }
Roietronics 4:12dfd9a8ee76 89 if(counter == 0) {
Roietronics 0:8326629a1b97 90 return;
Roietronics 0:8326629a1b97 91 }
Roietronics 0:8326629a1b97 92 }
Roietronics 0:8326629a1b97 93 }
Roietronics 0:8326629a1b97 94
Roietronics 0:8326629a1b97 95 void writeBuffer(const uint8_t* buffer, uint16_t count)
Roietronics 0:8326629a1b97 96 {
Roietronics 3:1ba96949e2fd 97 logInfo( "Sending Data to sensor");
Roietronics 0:8326629a1b97 98 uint8_t* pointer = (uint8_t*)buffer;
Roietronics 0:8326629a1b97 99 uint16_t counter = count;
Roietronics 0:8326629a1b97 100 while(1)
Roietronics 0:8326629a1b97 101 {
Roietronics 0:8326629a1b97 102 if(sensor.writeable())
Roietronics 0:8326629a1b97 103 {
Roietronics 3:1ba96949e2fd 104 logTrace(*pointer);
Roietronics 0:8326629a1b97 105 sensor.putc(*pointer++);
Roietronics 0:8326629a1b97 106 counter--;
Roietronics 0:8326629a1b97 107 }
Roietronics 4:12dfd9a8ee76 108 if(counter == 0) {
Roietronics 0:8326629a1b97 109 return;
Roietronics 0:8326629a1b97 110 }
Roietronics 0:8326629a1b97 111 }
Roietronics 0:8326629a1b97 112 }
Roietronics 0:8326629a1b97 113
Roietronics 4:12dfd9a8ee76 114 //Validate the received mesurements checksum
Roietronics 0:8326629a1b97 115
Roietronics 0:8326629a1b97 116 bool checkValue(uint8_t *thebuf, uint8_t leng)
Roietronics 0:8326629a1b97 117 {
Roietronics 0:8326629a1b97 118 bool receiveflag = false;
Roietronics 0:8326629a1b97 119 uint16_t receiveSum=0;
Roietronics 0:8326629a1b97 120
Roietronics 0:8326629a1b97 121 for(int i=0; i<(leng-2); i++){
Roietronics 0:8326629a1b97 122 receiveSum=receiveSum+thebuf[i];
Roietronics 0:8326629a1b97 123 }
Roietronics 0:8326629a1b97 124 receiveSum=receiveSum + 0x42;
Roietronics 0:8326629a1b97 125
Roietronics 0:8326629a1b97 126 if(receiveSum == ((thebuf[leng-2]<<8)+thebuf[leng-1])) //check the debug data
Roietronics 0:8326629a1b97 127 {
Roietronics 0:8326629a1b97 128 receiveSum = 0;
Roietronics 0:8326629a1b97 129 receiveflag = true;
Roietronics 0:8326629a1b97 130 }
Roietronics 0:8326629a1b97 131 return receiveflag;
Roietronics 0:8326629a1b97 132 }
Roietronics 0:8326629a1b97 133
Roietronics 0:8326629a1b97 134 //Extract the 1 micron particle count from the messaage
Roietronics 0:8326629a1b97 135 uint16_t transmitPM01(uint8_t *thebuf)
Roietronics 0:8326629a1b97 136 {
Roietronics 0:8326629a1b97 137 uint16_t PM01Val;
Roietronics 0:8326629a1b97 138 PM01Val=((thebuf[3]<<8) + thebuf[4]); //count PM1.0 value of the air detector module
Roietronics 0:8326629a1b97 139 return PM01Val;
Roietronics 0:8326629a1b97 140 }
Roietronics 0:8326629a1b97 141
Roietronics 0:8326629a1b97 142 //Extract the 2.5 micron particle count from the messaage
Roietronics 0:8326629a1b97 143 uint16_t transmitPM2_5(uint8_t *thebuf)
Roietronics 0:8326629a1b97 144 {
Roietronics 0:8326629a1b97 145 uint16_t PM2_5Val;
Roietronics 0:8326629a1b97 146 PM2_5Val=((thebuf[5]<<8) + thebuf[6]);//count PM2.5 value of the air detector module
Roietronics 0:8326629a1b97 147 return PM2_5Val;
Roietronics 0:8326629a1b97 148 }
Roietronics 0:8326629a1b97 149
Roietronics 0:8326629a1b97 150 //Extract the 10 micron particle count from the messaage
Roietronics 0:8326629a1b97 151 uint16_t transmitPM10(uint8_t *thebuf)
Roietronics 0:8326629a1b97 152 {
Roietronics 0:8326629a1b97 153 uint16_t PM10Val;
Roietronics 0:8326629a1b97 154 PM10Val=((thebuf[7]<<8) + thebuf[8]); //count PM10 value of the air detector module
Roietronics 0:8326629a1b97 155 return PM10Val;
Roietronics 0:8326629a1b97 156 }
Roietronics 0:8326629a1b97 157
Roietronics 0:8326629a1b97 158 int main()
Roietronics 0:8326629a1b97 159 {
Roietronics 0:8326629a1b97 160 uint8_t dataBuffer[32];
Roietronics 0:8326629a1b97 161 uint16_t response;
Roietronics 0:8326629a1b97 162 uint16_t PM01Value=0; //define PM1.0 value of the air detector module
Roietronics 0:8326629a1b97 163 uint16_t PM2_5Value=0; //define PM2.5 value of the air detector module
Roietronics 0:8326629a1b97 164 uint16_t PM10Value=0; //define PM10 value of the air detector module
Roietronics 4:12dfd9a8ee76 165
Roietronics 4:12dfd9a8ee76 166 pc.printf("Starting Honeywell Dust Sesor App version %s", VERSION);
Roietronics 0:8326629a1b97 167
Roietronics 0:8326629a1b97 168 //Send start command to the sensor
Roietronics 0:8326629a1b97 169 writeBuffer(measureCommand, 4);
Roietronics 0:8326629a1b97 170 //Wait for sensors response
Roietronics 0:8326629a1b97 171 //while(!sensor.readable());
Roietronics 0:8326629a1b97 172 readBuffer(dataBuffer, 2);
Roietronics 0:8326629a1b97 173 response = dataBuffer[0] << 8 || dataBuffer[1];
Roietronics 0:8326629a1b97 174
Roietronics 0:8326629a1b97 175 switch(response) {
Roietronics 0:8326629a1b97 176 case OK:
Roietronics 0:8326629a1b97 177 logInfo("Sensor Auto Measurement Started");
Roietronics 0:8326629a1b97 178 break;
Roietronics 0:8326629a1b97 179 case BAD:
Roietronics 0:8326629a1b97 180 logInfo("Sensor rejected Start Measurement Commmand");
Roietronics 0:8326629a1b97 181 return -1;
Roietronics 0:8326629a1b97 182 default:
Roietronics 0:8326629a1b97 183 logInfo("Communication Error: Invalid Sensor Response");
Roietronics 0:8326629a1b97 184 return -2;
Roietronics 0:8326629a1b97 185 }
Roietronics 0:8326629a1b97 186 t.start();
Roietronics 4:12dfd9a8ee76 187
Roietronics 0:8326629a1b97 188 //Start continous loop
Roietronics 4:12dfd9a8ee76 189 uint32_t count = 0;
Roietronics 4:12dfd9a8ee76 190 while(count++ < 4)
Roietronics 0:8326629a1b97 191 {
Roietronics 0:8326629a1b97 192 if(sensor.getc() == 0x42){ //start to read when detect 0x42
Roietronics 0:8326629a1b97 193 readBuffer(dataBuffer,MESSAGE_LEN -1);
Roietronics 0:8326629a1b97 194
Roietronics 0:8326629a1b97 195 if(dataBuffer[0] == 0x4d){
Roietronics 4:12dfd9a8ee76 196 if(checkValue(dataBuffer,MESSAGE_LEN-1)){
Roietronics 0:8326629a1b97 197 PM01Value=transmitPM01(dataBuffer); //count PM1.0 value of the air detector module
Roietronics 0:8326629a1b97 198 PM2_5Value=transmitPM2_5(dataBuffer);//count PM2.5 value of the air detector module
Roietronics 0:8326629a1b97 199 PM10Value=transmitPM10(dataBuffer); //count PM10 value of the air detector module
Roietronics 0:8326629a1b97 200 }
Roietronics 0:8326629a1b97 201 }
Roietronics 0:8326629a1b97 202 }
Roietronics 0:8326629a1b97 203
Roietronics 0:8326629a1b97 204 char input = pc.getc();
Roietronics 0:8326629a1b97 205 if(input == 'Q' || input == 'q')
Roietronics 0:8326629a1b97 206 {
Roietronics 0:8326629a1b97 207 t.stop();
Roietronics 0:8326629a1b97 208 writeBuffer(stopCommand, 4);
Roietronics 0:8326629a1b97 209 logInfo("Exit request received");
Roietronics 0:8326629a1b97 210 return 0;
Roietronics 0:8326629a1b97 211 }
Roietronics 0:8326629a1b97 212 static unsigned long OledTimer= t.read_ms();
Roietronics 0:8326629a1b97 213 if (t.read_ms() - OledTimer >=1000)
Roietronics 0:8326629a1b97 214 {
Roietronics 0:8326629a1b97 215 OledTimer= t.read_ms();
Roietronics 0:8326629a1b97 216
Roietronics 1:8cad8f7852d4 217 pc.printf("PM1.0: %d ug/m3", PM01Value);
Roietronics 0:8326629a1b97 218 // debug.print(PM01Value);
Roietronics 0:8326629a1b97 219 // debug.println(" ug/m3");
Roietronics 0:8326629a1b97 220
Roietronics 1:8cad8f7852d4 221 pc.printf("PM2.5: %d ug/m3", PM2_5Value);
Roietronics 0:8326629a1b97 222 // debug.print(PM2_5Value);
Roietronics 0:8326629a1b97 223 // debug.println(" ug/m3");
Roietronics 0:8326629a1b97 224
Roietronics 1:8cad8f7852d4 225 pc.printf("PM10: %d ug/m3", PM10Value);
Roietronics 0:8326629a1b97 226 // debug.print(PM10Value);
Roietronics 0:8326629a1b97 227 // debug.println(" ug/m3");
Roietronics 1:8cad8f7852d4 228 pc.printf("\n");
Roietronics 0:8326629a1b97 229
Roietronics 0:8326629a1b97 230 }
Roietronics 0:8326629a1b97 231 }
Roietronics 4:12dfd9a8ee76 232 pc.printf("Honeywell Dust Sensor exiting");
Roietronics 0:8326629a1b97 233 }