mDot / Mbed OS Honneywell_Dust_Simple

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Main.cpp@3:1ba96949e2fd, 2017-08-05 (annotated)

Committer:
Roietronics
Date:
Sat Aug 05 06:59:15 2017 +0000
Revision:
3:1ba96949e2fd
Parent:
2:65f09ca5b557
Child:
4:12dfd9a8ee76
Added additional debug logging

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 0:8326629a1b97 10 #define TRACE_MODE
Roietronics 0:8326629a1b97 11
Roietronics 0:8326629a1b97 12 //Turn on trace logging to the PC USB port
Roietronics 0:8326629a1b97 13 #ifdef TRACE_MODE
Roietronics 0:8326629a1b97 14 //Log level need to be set one level higher than the high level to be output
Roietronics 3:1ba96949e2fd 15 #define LOG_LEVEL 4
Roietronics 0:8326629a1b97 16 #define DEBUG
Roietronics 0:8326629a1b97 17 #endif
Roietronics 0:8326629a1b97 18
Roietronics 3:1ba96949e2fd 19
Roietronics 0:8326629a1b97 20 const uint8_t* measureCommand = "68014057";
Roietronics 0:8326629a1b97 21 const uint8_t* stopCommand = "68012077";
Roietronics 0:8326629a1b97 22
Roietronics 0:8326629a1b97 23 #define OK 0xA5A5
Roietronics 0:8326629a1b97 24 #define BAD 0x9696
Roietronics 0:8326629a1b97 25
Roietronics 0:8326629a1b97 26 #define MESSAGE_LEN 32
Roietronics 0:8326629a1b97 27 //sensor measurement cycle in millseconds
Roietronics 0:8326629a1b97 28 #define MEASURE_DELAY 1500
Roietronics 0:8326629a1b97 29
Roietronics 3:1ba96949e2fd 30 Serial pc(USBTX, USBRX, 115200);
Roietronics 3:1ba96949e2fd 31
Roietronics 0:8326629a1b97 32 //Use USB debug pott for the debug stream
Roietronics 0:8326629a1b97 33 #ifdef DEBUG
Roietronics 3:1ba96949e2fd 34 uint32_t debugLevel = LOG_LEVEL;
Roietronics 3:1ba96949e2fd 35 #else
Roietronics 3:1ba96949e2fd 36 uint32_t debugLevel = 0;
Roietronics 0:8326629a1b97 37 #endif
Roietronics 0:8326629a1b97 38
Roietronics 3:1ba96949e2fd 39 void logInfo(char* text) {
Roietronics 3:1ba96949e2fd 40 if ( debugLevel > 0 ) {
Roietronics 3:1ba96949e2fd 41 pc.printf("\n%s\n", text );
Roietronics 3:1ba96949e2fd 42 }
Roietronics 3:1ba96949e2fd 43 return;
Roietronics 3:1ba96949e2fd 44 }
Roietronics 3:1ba96949e2fd 45
Roietronics 3:1ba96949e2fd 46 void logTrace(uint8_t data) {
Roietronics 3:1ba96949e2fd 47 if (debugLevel > 2 ){ pc.putc( data );
Roietronics 3:1ba96949e2fd 48 }
Roietronics 3:1ba96949e2fd 49 return;
Roietronics 3:1ba96949e2fd 50 }
Roietronics 3:1ba96949e2fd 51
Roietronics 3:1ba96949e2fd 52
Roietronics 3:1ba96949e2fd 53 //Use second UART to communicate witb the Honneywell sensor
Roietronics 0:8326629a1b97 54 //Default UART setting are 8,N,1
Roietronics 0:8326629a1b97 55 Serial sensor(PA_2, PA_3 , 9600);
Roietronics 0:8326629a1b97 56
Roietronics 0:8326629a1b97 57 Timer t;
Roietronics 0:8326629a1b97 58
Roietronics 3:1ba96949e2fd 59
Roietronics 0:8326629a1b97 60 //synchrnous serial read and writes
Roietronics 0:8326629a1b97 61 //Mbed 5 Serial class only supports single character read and writes or
Roietronics 0:8326629a1b97 62 // async buffer reads abd wrutes
Roietronics 0:8326629a1b97 63 void readBuffer(uint8_t* buffer, uint16_t count)
Roietronics 0:8326629a1b97 64 {
Roietronics 3:1ba96949e2fd 65 logInfo( "Receiving Data from sensor");
Roietronics 0:8326629a1b97 66 uint8_t* pointer = buffer;
Roietronics 0:8326629a1b97 67 uint16_t counter = count;
Roietronics 0:8326629a1b97 68 while(1)
Roietronics 0:8326629a1b97 69 {
Roietronics 0:8326629a1b97 70 if(sensor.readable())
Roietronics 0:8326629a1b97 71 {
Roietronics 0:8326629a1b97 72 *pointer++ = sensor.getc();
Roietronics 3:1ba96949e2fd 73 logTrace(*pointer);
Roietronics 0:8326629a1b97 74 counter--;
Roietronics 0:8326629a1b97 75 }
Roietronics 0:8326629a1b97 76 if(count == 0) {
Roietronics 0:8326629a1b97 77 return;
Roietronics 0:8326629a1b97 78 }
Roietronics 0:8326629a1b97 79 }
Roietronics 0:8326629a1b97 80 }
Roietronics 0:8326629a1b97 81
Roietronics 0:8326629a1b97 82 void writeBuffer(const uint8_t* buffer, uint16_t count)
Roietronics 0:8326629a1b97 83 {
Roietronics 3:1ba96949e2fd 84 logInfo( "Sending Data to sensor");
Roietronics 0:8326629a1b97 85 uint8_t* pointer = (uint8_t*)buffer;
Roietronics 0:8326629a1b97 86 uint16_t counter = count;
Roietronics 0:8326629a1b97 87 while(1)
Roietronics 0:8326629a1b97 88 {
Roietronics 0:8326629a1b97 89 if(sensor.writeable())
Roietronics 0:8326629a1b97 90 {
Roietronics 3:1ba96949e2fd 91 logTrace(*pointer);
Roietronics 0:8326629a1b97 92 sensor.putc(*pointer++);
Roietronics 0:8326629a1b97 93 counter--;
Roietronics 0:8326629a1b97 94 }
Roietronics 0:8326629a1b97 95 if(count == 0) {
Roietronics 0:8326629a1b97 96 return;
Roietronics 0:8326629a1b97 97 }
Roietronics 0:8326629a1b97 98 }
Roietronics 0:8326629a1b97 99 }
Roietronics 0:8326629a1b97 100
Roietronics 0:8326629a1b97 101 //Va;idate the received mesurements checksum
Roietronics 0:8326629a1b97 102
Roietronics 0:8326629a1b97 103 bool checkValue(uint8_t *thebuf, uint8_t leng)
Roietronics 0:8326629a1b97 104 {
Roietronics 0:8326629a1b97 105 bool receiveflag = false;
Roietronics 0:8326629a1b97 106 uint16_t receiveSum=0;
Roietronics 0:8326629a1b97 107
Roietronics 0:8326629a1b97 108 for(int i=0; i<(leng-2); i++){
Roietronics 0:8326629a1b97 109 receiveSum=receiveSum+thebuf[i];
Roietronics 0:8326629a1b97 110 }
Roietronics 0:8326629a1b97 111 receiveSum=receiveSum + 0x42;
Roietronics 0:8326629a1b97 112
Roietronics 0:8326629a1b97 113 if(receiveSum == ((thebuf[leng-2]<<8)+thebuf[leng-1])) //check the debug data
Roietronics 0:8326629a1b97 114 {
Roietronics 0:8326629a1b97 115 receiveSum = 0;
Roietronics 0:8326629a1b97 116 receiveflag = true;
Roietronics 0:8326629a1b97 117 }
Roietronics 0:8326629a1b97 118 return receiveflag;
Roietronics 0:8326629a1b97 119 }
Roietronics 0:8326629a1b97 120
Roietronics 0:8326629a1b97 121 //Extract the 1 micron particle count from the messaage
Roietronics 0:8326629a1b97 122 uint16_t transmitPM01(uint8_t *thebuf)
Roietronics 0:8326629a1b97 123 {
Roietronics 0:8326629a1b97 124 uint16_t PM01Val;
Roietronics 0:8326629a1b97 125 PM01Val=((thebuf[3]<<8) + thebuf[4]); //count PM1.0 value of the air detector module
Roietronics 0:8326629a1b97 126 return PM01Val;
Roietronics 0:8326629a1b97 127 }
Roietronics 0:8326629a1b97 128
Roietronics 0:8326629a1b97 129 //Extract the 2.5 micron particle count from the messaage
Roietronics 0:8326629a1b97 130 uint16_t transmitPM2_5(uint8_t *thebuf)
Roietronics 0:8326629a1b97 131 {
Roietronics 0:8326629a1b97 132 uint16_t PM2_5Val;
Roietronics 0:8326629a1b97 133 PM2_5Val=((thebuf[5]<<8) + thebuf[6]);//count PM2.5 value of the air detector module
Roietronics 0:8326629a1b97 134 return PM2_5Val;
Roietronics 0:8326629a1b97 135 }
Roietronics 0:8326629a1b97 136
Roietronics 0:8326629a1b97 137 //Extract the 10 micron particle count from the messaage
Roietronics 0:8326629a1b97 138 uint16_t transmitPM10(uint8_t *thebuf)
Roietronics 0:8326629a1b97 139 {
Roietronics 0:8326629a1b97 140 uint16_t PM10Val;
Roietronics 0:8326629a1b97 141 PM10Val=((thebuf[7]<<8) + thebuf[8]); //count PM10 value of the air detector module
Roietronics 0:8326629a1b97 142 return PM10Val;
Roietronics 0:8326629a1b97 143 }
Roietronics 0:8326629a1b97 144
Roietronics 0:8326629a1b97 145 int main()
Roietronics 0:8326629a1b97 146 {
Roietronics 0:8326629a1b97 147 uint8_t dataBuffer[32];
Roietronics 0:8326629a1b97 148 uint16_t response;
Roietronics 0:8326629a1b97 149 uint16_t PM01Value=0; //define PM1.0 value of the air detector module
Roietronics 0:8326629a1b97 150 uint16_t PM2_5Value=0; //define PM2.5 value of the air detector module
Roietronics 0:8326629a1b97 151 uint16_t PM10Value=0; //define PM10 value of the air detector module
Roietronics 0:8326629a1b97 152
Roietronics 0:8326629a1b97 153 //Send start command to the sensor
Roietronics 0:8326629a1b97 154 writeBuffer(measureCommand, 4);
Roietronics 0:8326629a1b97 155 //Wait for sensors response
Roietronics 0:8326629a1b97 156 //while(!sensor.readable());
Roietronics 0:8326629a1b97 157 readBuffer(dataBuffer, 2);
Roietronics 0:8326629a1b97 158 response = dataBuffer[0] << 8 || dataBuffer[1];
Roietronics 0:8326629a1b97 159
Roietronics 0:8326629a1b97 160 switch(response) {
Roietronics 0:8326629a1b97 161 case OK:
Roietronics 0:8326629a1b97 162 logInfo("Sensor Auto Measurement Started");
Roietronics 0:8326629a1b97 163 break;
Roietronics 0:8326629a1b97 164 case BAD:
Roietronics 0:8326629a1b97 165 logInfo("Sensor rejected Start Measurement Commmand");
Roietronics 0:8326629a1b97 166 return -1;
Roietronics 0:8326629a1b97 167 default:
Roietronics 0:8326629a1b97 168 logInfo("Communication Error: Invalid Sensor Response");
Roietronics 0:8326629a1b97 169 return -2;
Roietronics 0:8326629a1b97 170 }
Roietronics 0:8326629a1b97 171 t.start();
Roietronics 0:8326629a1b97 172
Roietronics 0:8326629a1b97 173 //Start continous loop
Roietronics 0:8326629a1b97 174 while(1)
Roietronics 0:8326629a1b97 175 {
Roietronics 0:8326629a1b97 176 if(sensor.getc() == 0x42){ //start to read when detect 0x42
Roietronics 0:8326629a1b97 177 readBuffer(dataBuffer,MESSAGE_LEN -1);
Roietronics 0:8326629a1b97 178
Roietronics 0:8326629a1b97 179 if(dataBuffer[0] == 0x4d){
Roietronics 0:8326629a1b97 180 if(checkValue(dataBuffer,MESSAGE_LEN)){
Roietronics 0:8326629a1b97 181 PM01Value=transmitPM01(dataBuffer); //count PM1.0 value of the air detector module
Roietronics 0:8326629a1b97 182 PM2_5Value=transmitPM2_5(dataBuffer);//count PM2.5 value of the air detector module
Roietronics 0:8326629a1b97 183 PM10Value=transmitPM10(dataBuffer); //count PM10 value of the air detector module
Roietronics 0:8326629a1b97 184 }
Roietronics 0:8326629a1b97 185 }
Roietronics 0:8326629a1b97 186 }
Roietronics 0:8326629a1b97 187
Roietronics 0:8326629a1b97 188 char input = pc.getc();
Roietronics 0:8326629a1b97 189 if(input == 'Q' || input == 'q')
Roietronics 0:8326629a1b97 190 {
Roietronics 0:8326629a1b97 191 t.stop();
Roietronics 0:8326629a1b97 192 writeBuffer(stopCommand, 4);
Roietronics 0:8326629a1b97 193 logInfo("Exit request received");
Roietronics 0:8326629a1b97 194 return 0;
Roietronics 0:8326629a1b97 195 }
Roietronics 0:8326629a1b97 196 static unsigned long OledTimer= t.read_ms();
Roietronics 0:8326629a1b97 197 if (t.read_ms() - OledTimer >=1000)
Roietronics 0:8326629a1b97 198 {
Roietronics 0:8326629a1b97 199 OledTimer= t.read_ms();
Roietronics 0:8326629a1b97 200
Roietronics 1:8cad8f7852d4 201 pc.printf("PM1.0: %d ug/m3", PM01Value);
Roietronics 0:8326629a1b97 202 // debug.print(PM01Value);
Roietronics 0:8326629a1b97 203 // debug.println(" ug/m3");
Roietronics 0:8326629a1b97 204
Roietronics 1:8cad8f7852d4 205 pc.printf("PM2.5: %d ug/m3", PM2_5Value);
Roietronics 0:8326629a1b97 206 // debug.print(PM2_5Value);
Roietronics 0:8326629a1b97 207 // debug.println(" ug/m3");
Roietronics 0:8326629a1b97 208
Roietronics 1:8cad8f7852d4 209 pc.printf("PM10: %d ug/m3", PM10Value);
Roietronics 0:8326629a1b97 210 // debug.print(PM10Value);
Roietronics 0:8326629a1b97 211 // debug.println(" ug/m3");
Roietronics 1:8cad8f7852d4 212 pc.printf("\n");
Roietronics 0:8326629a1b97 213
Roietronics 0:8326629a1b97 214 }
Roietronics 0:8326629a1b97 215 }
Roietronics 0:8326629a1b97 216 }