mDot / Mbed OS Honneywell_Dust_Simple

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Main.cpp@6:6aa9d16e27bc, 2017-08-09 (annotated)

Committer:
Roietronics
Date:
Wed Aug 09 18:57:37 2017 +0000
Revision:
6:6aa9d16e27bc
Parent:
5:7cabc36d4352
Child:
7:5f612ed18852
Version 1.3

; Fixed bug in checksum calculation

; Removed commented out Arduino specific code

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 6:6aa9d16e27bc 10 #define VERSION "1.3"
Roietronics 4:12dfd9a8ee76 11
Roietronics 0:8326629a1b97 12 #define TRACE_MODE
Roietronics 0:8326629a1b97 13
Roietronics 0:8326629a1b97 14 //Turn on trace logging to the PC USB port
Roietronics 0:8326629a1b97 15 #ifdef TRACE_MODE
Roietronics 0:8326629a1b97 16 //Log level need to be set one level higher than the high level to be output
Roietronics 5:7cabc36d4352 17 #define LOG_LEVEL 2
Roietronics 0:8326629a1b97 18 #define DEBUG
Roietronics 0:8326629a1b97 19 #endif
Roietronics 0:8326629a1b97 20
Roietronics 3:1ba96949e2fd 21
Roietronics 0:8326629a1b97 22 const uint8_t* measureCommand = "68014057";
Roietronics 0:8326629a1b97 23 const uint8_t* stopCommand = "68012077";
Roietronics 0:8326629a1b97 24
Roietronics 5:7cabc36d4352 25 //Sensor command response codes
Roietronics 0:8326629a1b97 26 #define OK 0xA5A5
Roietronics 0:8326629a1b97 27 #define BAD 0x9696
Roietronics 0:8326629a1b97 28
Roietronics 5:7cabc36d4352 29 //Auto Mode measurement response lenght
Roietronics 0:8326629a1b97 30 #define MESSAGE_LEN 32
Roietronics 5:7cabc36d4352 31
Roietronics 0:8326629a1b97 32 //sensor measurement cycle in millseconds
Roietronics 0:8326629a1b97 33 #define MEASURE_DELAY 1500
Roietronics 0:8326629a1b97 34
Roietronics 3:1ba96949e2fd 35 Serial pc(USBTX, USBRX, 115200);
Roietronics 3:1ba96949e2fd 36
Roietronics 0:8326629a1b97 37 //Use USB debug pott for the debug stream
Roietronics 0:8326629a1b97 38 #ifdef DEBUG
Roietronics 3:1ba96949e2fd 39 uint32_t debugLevel = LOG_LEVEL;
Roietronics 3:1ba96949e2fd 40 #else
Roietronics 3:1ba96949e2fd 41 uint32_t debugLevel = 0;
Roietronics 0:8326629a1b97 42 #endif
Roietronics 0:8326629a1b97 43
Roietronics 3:1ba96949e2fd 44 void logInfo(char* text) {
Roietronics 3:1ba96949e2fd 45 if ( debugLevel > 0 ) {
Roietronics 3:1ba96949e2fd 46 pc.printf("\n%s\n", text );
Roietronics 3:1ba96949e2fd 47 }
Roietronics 3:1ba96949e2fd 48 return;
Roietronics 5:7cabc36d4352 49 }
Roietronics 3:1ba96949e2fd 50
Roietronics 3:1ba96949e2fd 51 void logTrace(uint8_t data) {
Roietronics 3:1ba96949e2fd 52 if (debugLevel > 2 ){ pc.putc( data );
Roietronics 3:1ba96949e2fd 53 }
Roietronics 3:1ba96949e2fd 54 return;
Roietronics 3:1ba96949e2fd 55 }
Roietronics 3:1ba96949e2fd 56
Roietronics 5:7cabc36d4352 57 //Board specfic serial port pin definitions
Roietronics 3:1ba96949e2fd 58
Roietronics 5:7cabc36d4352 59 #ifdef TARGET_Freescale //Freedom Board
Roietronics 5:7cabc36d4352 60
Roietronics 5:7cabc36d4352 61 #define SENSOR_XMT D1
Roietronics 5:7cabc36d4352 62 #define SENSOR_RCV D0
Roietronics 5:7cabc36d4352 63
Roietronics 5:7cabc36d4352 64 #endif
Roietronics 5:7cabc36d4352 65
Roietronics 5:7cabc36d4352 66 #ifdef TARGET_MTS_MDOT_F411RE //Multi Tech mDot
Roietronics 5:7cabc36d4352 67
Roietronics 5:7cabc36d4352 68 #define SENSOR_XMT PA_2
Roietronics 5:7cabc36d4352 69 #define SENSOR_RCV PA_3
Roietronics 5:7cabc36d4352 70
Roietronics 5:7cabc36d4352 71 #endif
Roietronics 5:7cabc36d4352 72
Roietronics 5:7cabc36d4352 73 //Use a boards second UART to communicate witb the Honneywell sensor
Roietronics 0:8326629a1b97 74 //Default UART setting are 8,N,1
Roietronics 5:7cabc36d4352 75 Serial sensor( SENSOR_XMT, SENSOR_RCV, 9600);
Roietronics 0:8326629a1b97 76
Roietronics 0:8326629a1b97 77 //synchrnous serial read and writes
Roietronics 0:8326629a1b97 78 //Mbed 5 Serial class only supports single character read and writes or
Roietronics 0:8326629a1b97 79 // async buffer reads abd wrutes
Roietronics 0:8326629a1b97 80 void readBuffer(uint8_t* buffer, uint16_t count)
Roietronics 0:8326629a1b97 81 {
Roietronics 5:7cabc36d4352 82 logInfo( "Receiving Data from sensor\n");
Roietronics 0:8326629a1b97 83 uint8_t* pointer = buffer;
Roietronics 0:8326629a1b97 84 uint16_t counter = count;
Roietronics 0:8326629a1b97 85 while(1)
Roietronics 0:8326629a1b97 86 {
Roietronics 0:8326629a1b97 87 if(sensor.readable())
Roietronics 0:8326629a1b97 88 {
Roietronics 0:8326629a1b97 89 *pointer++ = sensor.getc();
Roietronics 3:1ba96949e2fd 90 logTrace(*pointer);
Roietronics 0:8326629a1b97 91 counter--;
Roietronics 0:8326629a1b97 92 }
Roietronics 4:12dfd9a8ee76 93 if(counter == 0) {
Roietronics 0:8326629a1b97 94 return;
Roietronics 0:8326629a1b97 95 }
Roietronics 0:8326629a1b97 96 }
Roietronics 0:8326629a1b97 97 }
Roietronics 0:8326629a1b97 98
Roietronics 0:8326629a1b97 99 void writeBuffer(const uint8_t* buffer, uint16_t count)
Roietronics 0:8326629a1b97 100 {
Roietronics 5:7cabc36d4352 101 logInfo( "Sending Data to sensor\n");
Roietronics 0:8326629a1b97 102 uint8_t* pointer = (uint8_t*)buffer;
Roietronics 0:8326629a1b97 103 uint16_t counter = count;
Roietronics 0:8326629a1b97 104 while(1)
Roietronics 0:8326629a1b97 105 {
Roietronics 0:8326629a1b97 106 if(sensor.writeable())
Roietronics 0:8326629a1b97 107 {
Roietronics 3:1ba96949e2fd 108 logTrace(*pointer);
Roietronics 0:8326629a1b97 109 sensor.putc(*pointer++);
Roietronics 0:8326629a1b97 110 counter--;
Roietronics 0:8326629a1b97 111 }
Roietronics 4:12dfd9a8ee76 112 if(counter == 0) {
Roietronics 0:8326629a1b97 113 return;
Roietronics 0:8326629a1b97 114 }
Roietronics 0:8326629a1b97 115 }
Roietronics 0:8326629a1b97 116 }
Roietronics 0:8326629a1b97 117
Roietronics 4:12dfd9a8ee76 118 //Validate the received mesurements checksum
Roietronics 0:8326629a1b97 119
Roietronics 0:8326629a1b97 120 bool checkValue(uint8_t *thebuf, uint8_t leng)
Roietronics 0:8326629a1b97 121 {
Roietronics 0:8326629a1b97 122 bool receiveflag = false;
Roietronics 0:8326629a1b97 123 uint16_t receiveSum=0;
Roietronics 0:8326629a1b97 124
Roietronics 6:6aa9d16e27bc 125 //Don't include the checksum bytes in the sum
Roietronics 6:6aa9d16e27bc 126 for(int i=0; i<(leng-3); i++){
Roietronics 0:8326629a1b97 127 receiveSum=receiveSum+thebuf[i];
Roietronics 0:8326629a1b97 128 }
Roietronics 0:8326629a1b97 129 receiveSum=receiveSum + 0x42;
Roietronics 0:8326629a1b97 130
Roietronics 0:8326629a1b97 131 if(receiveSum == ((thebuf[leng-2]<<8)+thebuf[leng-1])) //check the debug data
Roietronics 0:8326629a1b97 132 {
Roietronics 0:8326629a1b97 133 receiveSum = 0;
Roietronics 0:8326629a1b97 134 receiveflag = true;
Roietronics 0:8326629a1b97 135 }
Roietronics 0:8326629a1b97 136 return receiveflag;
Roietronics 0:8326629a1b97 137 }
Roietronics 0:8326629a1b97 138
Roietronics 0:8326629a1b97 139 //Extract the 1 micron particle count from the messaage
Roietronics 0:8326629a1b97 140 uint16_t transmitPM01(uint8_t *thebuf)
Roietronics 0:8326629a1b97 141 {
Roietronics 0:8326629a1b97 142 uint16_t PM01Val;
Roietronics 0:8326629a1b97 143 PM01Val=((thebuf[3]<<8) + thebuf[4]); //count PM1.0 value of the air detector module
Roietronics 0:8326629a1b97 144 return PM01Val;
Roietronics 0:8326629a1b97 145 }
Roietronics 0:8326629a1b97 146
Roietronics 0:8326629a1b97 147 //Extract the 2.5 micron particle count from the messaage
Roietronics 0:8326629a1b97 148 uint16_t transmitPM2_5(uint8_t *thebuf)
Roietronics 0:8326629a1b97 149 {
Roietronics 0:8326629a1b97 150 uint16_t PM2_5Val;
Roietronics 0:8326629a1b97 151 PM2_5Val=((thebuf[5]<<8) + thebuf[6]);//count PM2.5 value of the air detector module
Roietronics 0:8326629a1b97 152 return PM2_5Val;
Roietronics 0:8326629a1b97 153 }
Roietronics 0:8326629a1b97 154
Roietronics 0:8326629a1b97 155 //Extract the 10 micron particle count from the messaage
Roietronics 0:8326629a1b97 156 uint16_t transmitPM10(uint8_t *thebuf)
Roietronics 0:8326629a1b97 157 {
Roietronics 0:8326629a1b97 158 uint16_t PM10Val;
Roietronics 0:8326629a1b97 159 PM10Val=((thebuf[7]<<8) + thebuf[8]); //count PM10 value of the air detector module
Roietronics 0:8326629a1b97 160 return PM10Val;
Roietronics 0:8326629a1b97 161 }
Roietronics 0:8326629a1b97 162
Roietronics 0:8326629a1b97 163 int main()
Roietronics 0:8326629a1b97 164 {
Roietronics 5:7cabc36d4352 165 uint8_t dataBuffer[MESSAGE_LEN];
Roietronics 0:8326629a1b97 166 uint16_t response;
Roietronics 0:8326629a1b97 167 uint16_t PM01Value=0; //define PM1.0 value of the air detector module
Roietronics 0:8326629a1b97 168 uint16_t PM2_5Value=0; //define PM2.5 value of the air detector module
Roietronics 0:8326629a1b97 169 uint16_t PM10Value=0; //define PM10 value of the air detector module
Roietronics 4:12dfd9a8ee76 170
Roietronics 5:7cabc36d4352 171 pc.printf("Starting Honeywell Dust Sesor App version %s/n", VERSION);
Roietronics 0:8326629a1b97 172
Roietronics 0:8326629a1b97 173 //Send start command to the sensor
Roietronics 0:8326629a1b97 174 writeBuffer(measureCommand, 4);
Roietronics 5:7cabc36d4352 175 /*
Roietronics 5:7cabc36d4352 176 Not geting response from sensor - first characters received are measurement data
Roietronics 0:8326629a1b97 177 //Wait for sensors response
Roietronics 0:8326629a1b97 178 //while(!sensor.readable());
Roietronics 0:8326629a1b97 179 readBuffer(dataBuffer, 2);
Roietronics 0:8326629a1b97 180 response = dataBuffer[0] << 8 || dataBuffer[1];
Roietronics 0:8326629a1b97 181
Roietronics 0:8326629a1b97 182 switch(response) {
Roietronics 0:8326629a1b97 183 case OK:
Roietronics 0:8326629a1b97 184 logInfo("Sensor Auto Measurement Started");
Roietronics 0:8326629a1b97 185 break;
Roietronics 0:8326629a1b97 186 case BAD:
Roietronics 0:8326629a1b97 187 logInfo("Sensor rejected Start Measurement Commmand");
Roietronics 0:8326629a1b97 188 return -1;
Roietronics 0:8326629a1b97 189 default:
Roietronics 0:8326629a1b97 190 logInfo("Communication Error: Invalid Sensor Response");
Roietronics 0:8326629a1b97 191 return -2;
Roietronics 0:8326629a1b97 192 }
Roietronics 5:7cabc36d4352 193 */
Roietronics 4:12dfd9a8ee76 194
Roietronics 0:8326629a1b97 195 //Start continous loop
Roietronics 5:7cabc36d4352 196 while(1)
Roietronics 0:8326629a1b97 197 {
Roietronics 0:8326629a1b97 198 if(sensor.getc() == 0x42){ //start to read when detect 0x42
Roietronics 0:8326629a1b97 199 readBuffer(dataBuffer,MESSAGE_LEN -1);
Roietronics 0:8326629a1b97 200
Roietronics 0:8326629a1b97 201 if(dataBuffer[0] == 0x4d){
Roietronics 6:6aa9d16e27bc 202 if(checkValue(dataBuffer, MESSAGE_LEN-1)){
Roietronics 0:8326629a1b97 203 PM01Value=transmitPM01(dataBuffer); //count PM1.0 value of the air detector module
Roietronics 0:8326629a1b97 204 PM2_5Value=transmitPM2_5(dataBuffer);//count PM2.5 value of the air detector module
Roietronics 0:8326629a1b97 205 PM10Value=transmitPM10(dataBuffer); //count PM10 value of the air detector module
Roietronics 0:8326629a1b97 206 }
Roietronics 6:6aa9d16e27bc 207 else {
Roietronics 6:6aa9d16e27bc 208 pc.printf("Message checksum error\n");
Roietronics 6:6aa9d16e27bc 209 }
Roietronics 6:6aa9d16e27bc 210
Roietronics 0:8326629a1b97 211 }
Roietronics 0:8326629a1b97 212 }
Roietronics 5:7cabc36d4352 213 //Check for exit request
Roietronics 5:7cabc36d4352 214 if(pc.readable()) {
Roietronics 5:7cabc36d4352 215 char input = pc.getc();
Roietronics 5:7cabc36d4352 216 if(input == 'Q' || input == 'q')
Roietronics 5:7cabc36d4352 217 {
Roietronics 5:7cabc36d4352 218 writeBuffer(stopCommand, 4);
Roietronics 5:7cabc36d4352 219 pc.printf("Exit request received\n");
Roietronics 5:7cabc36d4352 220 return 0;
Roietronics 5:7cabc36d4352 221 }
Roietronics 0:8326629a1b97 222 }
Roietronics 6:6aa9d16e27bc 223 // Use MBed wait function instead of Arduino delay loop
Roietronics 5:7cabc36d4352 224 wait_ms(1000);
Roietronics 0:8326629a1b97 225
Roietronics 5:7cabc36d4352 226 pc.printf("PM1.0: %d ug/m3", PM01Value);
Roietronics 0:8326629a1b97 227
Roietronics 5:7cabc36d4352 228 pc.printf("PM2.5: %d ug/m3", PM2_5Value);
Roietronics 0:8326629a1b97 229
Roietronics 6:6aa9d16e27bc 230 pc.printf("PM10: %d ug/m3", PM10Value);
Roietronics 6:6aa9d16e27bc 231
Roietronics 5:7cabc36d4352 232 pc.printf("\n");
Roietronics 0:8326629a1b97 233
Roietronics 0:8326629a1b97 234 }
Roietronics 0:8326629a1b97 235 }