mDot / Mbed OS Honneywell_Dust_Simple

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Main.cpp@2:65f09ca5b557, 2017-08-01 (annotated)

Committer:
Roietronics
Date:
Tue Aug 01 14:01:02 2017 +0000
Revision:
2:65f09ca5b557
Parent:
1:8cad8f7852d4
Child:
3:1ba96949e2fd
Fixed comment

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 0:8326629a1b97 2 Version 1.0
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 "mDot.h"
Roietronics 0:8326629a1b97 9 #include "MTSLog.h"
Roietronics 0:8326629a1b97 10 #include "stdlib.h"
Roietronics 0:8326629a1b97 11 #include <Stream.h>
Roietronics 0:8326629a1b97 12
Roietronics 0:8326629a1b97 13 #define TRACE_MODE
Roietronics 0:8326629a1b97 14
Roietronics 0:8326629a1b97 15 //Turn on trace logging to the PC USB port
Roietronics 0:8326629a1b97 16 #ifdef TRACE_MODE
Roietronics 0:8326629a1b97 17 //Log level need to be set one level higher than the high level to be output
Roietronics 0:8326629a1b97 18 #define LOG_LEVEL mts::MTSLog::TRACE_LEVEL + 1
Roietronics 0:8326629a1b97 19 #define DEBUG
Roietronics 0:8326629a1b97 20 #endif
Roietronics 0:8326629a1b97 21
Roietronics 0:8326629a1b97 22 const uint8_t* measureCommand = "68014057";
Roietronics 0:8326629a1b97 23 const uint8_t* stopCommand = "68012077";
Roietronics 0:8326629a1b97 24
Roietronics 0:8326629a1b97 25 #define OK 0xA5A5
Roietronics 0:8326629a1b97 26 #define BAD 0x9696
Roietronics 0:8326629a1b97 27
Roietronics 0:8326629a1b97 28 #define MESSAGE_LEN 32
Roietronics 0:8326629a1b97 29 //sensor measurement cycle in millseconds
Roietronics 0:8326629a1b97 30 #define MEASURE_DELAY 1500
Roietronics 0:8326629a1b97 31
Roietronics 0:8326629a1b97 32 //Use USB debug pott for the debug stream
Roietronics 0:8326629a1b97 33 #ifdef DEBUG
Roietronics 0:8326629a1b97 34 Serial pc(USBTX, USBRX, 115200);
Roietronics 0:8326629a1b97 35 #endif
Roietronics 0:8326629a1b97 36
Roietronics 2:65f09ca5b557 37 //Use second UART to communicate witb the Honneywell sensor
Roietronics 0:8326629a1b97 38 //Default UART setting are 8,N,1
Roietronics 0:8326629a1b97 39 Serial sensor(PA_2, PA_3 , 9600);
Roietronics 0:8326629a1b97 40
Roietronics 0:8326629a1b97 41 Timer t;
Roietronics 0:8326629a1b97 42
Roietronics 0:8326629a1b97 43 //synchrnous serial read and writes
Roietronics 0:8326629a1b97 44 //Mbed 5 Serial class only supports single character read and writes or
Roietronics 0:8326629a1b97 45 // async buffer reads abd wrutes
Roietronics 0:8326629a1b97 46 void readBuffer(uint8_t* buffer, uint16_t count)
Roietronics 0:8326629a1b97 47 {
Roietronics 0:8326629a1b97 48 uint8_t* pointer = buffer;
Roietronics 0:8326629a1b97 49 uint16_t counter = count;
Roietronics 0:8326629a1b97 50 while(1)
Roietronics 0:8326629a1b97 51 {
Roietronics 0:8326629a1b97 52 if(sensor.readable())
Roietronics 0:8326629a1b97 53 {
Roietronics 0:8326629a1b97 54 *pointer++ = sensor.getc();
Roietronics 0:8326629a1b97 55 counter--;
Roietronics 0:8326629a1b97 56 }
Roietronics 0:8326629a1b97 57 if(count == 0) {
Roietronics 0:8326629a1b97 58 return;
Roietronics 0:8326629a1b97 59 }
Roietronics 0:8326629a1b97 60 }
Roietronics 0:8326629a1b97 61 }
Roietronics 0:8326629a1b97 62
Roietronics 0:8326629a1b97 63 void writeBuffer(const uint8_t* buffer, uint16_t count)
Roietronics 0:8326629a1b97 64 {
Roietronics 0:8326629a1b97 65 uint8_t* pointer = (uint8_t*)buffer;
Roietronics 0:8326629a1b97 66 uint16_t counter = count;
Roietronics 0:8326629a1b97 67 while(1)
Roietronics 0:8326629a1b97 68 {
Roietronics 0:8326629a1b97 69 if(sensor.writeable())
Roietronics 0:8326629a1b97 70 {
Roietronics 0:8326629a1b97 71 sensor.putc(*pointer++);
Roietronics 0:8326629a1b97 72 counter--;
Roietronics 0:8326629a1b97 73 }
Roietronics 0:8326629a1b97 74 if(count == 0) {
Roietronics 0:8326629a1b97 75 return;
Roietronics 0:8326629a1b97 76 }
Roietronics 0:8326629a1b97 77 }
Roietronics 0:8326629a1b97 78 }
Roietronics 0:8326629a1b97 79
Roietronics 0:8326629a1b97 80 //Va;idate the received mesurements checksum
Roietronics 0:8326629a1b97 81
Roietronics 0:8326629a1b97 82 bool checkValue(uint8_t *thebuf, uint8_t leng)
Roietronics 0:8326629a1b97 83 {
Roietronics 0:8326629a1b97 84 bool receiveflag = false;
Roietronics 0:8326629a1b97 85 uint16_t receiveSum=0;
Roietronics 0:8326629a1b97 86
Roietronics 0:8326629a1b97 87 for(int i=0; i<(leng-2); i++){
Roietronics 0:8326629a1b97 88 receiveSum=receiveSum+thebuf[i];
Roietronics 0:8326629a1b97 89 }
Roietronics 0:8326629a1b97 90 receiveSum=receiveSum + 0x42;
Roietronics 0:8326629a1b97 91
Roietronics 0:8326629a1b97 92 if(receiveSum == ((thebuf[leng-2]<<8)+thebuf[leng-1])) //check the debug data
Roietronics 0:8326629a1b97 93 {
Roietronics 0:8326629a1b97 94 receiveSum = 0;
Roietronics 0:8326629a1b97 95 receiveflag = true;
Roietronics 0:8326629a1b97 96 }
Roietronics 0:8326629a1b97 97 return receiveflag;
Roietronics 0:8326629a1b97 98 }
Roietronics 0:8326629a1b97 99
Roietronics 0:8326629a1b97 100 //Extract the 1 micron particle count from the messaage
Roietronics 0:8326629a1b97 101 uint16_t transmitPM01(uint8_t *thebuf)
Roietronics 0:8326629a1b97 102 {
Roietronics 0:8326629a1b97 103 uint16_t PM01Val;
Roietronics 0:8326629a1b97 104 PM01Val=((thebuf[3]<<8) + thebuf[4]); //count PM1.0 value of the air detector module
Roietronics 0:8326629a1b97 105 return PM01Val;
Roietronics 0:8326629a1b97 106 }
Roietronics 0:8326629a1b97 107
Roietronics 0:8326629a1b97 108 //Extract the 2.5 micron particle count from the messaage
Roietronics 0:8326629a1b97 109 uint16_t transmitPM2_5(uint8_t *thebuf)
Roietronics 0:8326629a1b97 110 {
Roietronics 0:8326629a1b97 111 uint16_t PM2_5Val;
Roietronics 0:8326629a1b97 112 PM2_5Val=((thebuf[5]<<8) + thebuf[6]);//count PM2.5 value of the air detector module
Roietronics 0:8326629a1b97 113 return PM2_5Val;
Roietronics 0:8326629a1b97 114 }
Roietronics 0:8326629a1b97 115
Roietronics 0:8326629a1b97 116 //Extract the 10 micron particle count from the messaage
Roietronics 0:8326629a1b97 117 uint16_t transmitPM10(uint8_t *thebuf)
Roietronics 0:8326629a1b97 118 {
Roietronics 0:8326629a1b97 119 uint16_t PM10Val;
Roietronics 0:8326629a1b97 120 PM10Val=((thebuf[7]<<8) + thebuf[8]); //count PM10 value of the air detector module
Roietronics 0:8326629a1b97 121 return PM10Val;
Roietronics 0:8326629a1b97 122 }
Roietronics 0:8326629a1b97 123
Roietronics 0:8326629a1b97 124 int main()
Roietronics 0:8326629a1b97 125 {
Roietronics 0:8326629a1b97 126 uint8_t dataBuffer[32];
Roietronics 0:8326629a1b97 127 uint16_t response;
Roietronics 0:8326629a1b97 128 uint16_t PM01Value=0; //define PM1.0 value of the air detector module
Roietronics 0:8326629a1b97 129 uint16_t PM2_5Value=0; //define PM2.5 value of the air detector module
Roietronics 0:8326629a1b97 130 uint16_t PM10Value=0; //define PM10 value of the air detector module
Roietronics 0:8326629a1b97 131
Roietronics 0:8326629a1b97 132 //Send start command to the sensor
Roietronics 0:8326629a1b97 133 writeBuffer(measureCommand, 4);
Roietronics 0:8326629a1b97 134 //Wait for sensors response
Roietronics 0:8326629a1b97 135 //while(!sensor.readable());
Roietronics 0:8326629a1b97 136 readBuffer(dataBuffer, 2);
Roietronics 0:8326629a1b97 137 response = dataBuffer[0] << 8 || dataBuffer[1];
Roietronics 0:8326629a1b97 138
Roietronics 0:8326629a1b97 139 switch(response) {
Roietronics 0:8326629a1b97 140 case OK:
Roietronics 0:8326629a1b97 141 logInfo("Sensor Auto Measurement Started");
Roietronics 0:8326629a1b97 142 break;
Roietronics 0:8326629a1b97 143 case BAD:
Roietronics 0:8326629a1b97 144 logInfo("Sensor rejected Start Measurement Commmand");
Roietronics 0:8326629a1b97 145 return -1;
Roietronics 0:8326629a1b97 146 default:
Roietronics 0:8326629a1b97 147 logInfo("Communication Error: Invalid Sensor Response");
Roietronics 0:8326629a1b97 148 return -2;
Roietronics 0:8326629a1b97 149 }
Roietronics 0:8326629a1b97 150 t.start();
Roietronics 0:8326629a1b97 151
Roietronics 0:8326629a1b97 152 //Start continous loop
Roietronics 0:8326629a1b97 153 while(1)
Roietronics 0:8326629a1b97 154 {
Roietronics 0:8326629a1b97 155 if(sensor.getc() == 0x42){ //start to read when detect 0x42
Roietronics 0:8326629a1b97 156 readBuffer(dataBuffer,MESSAGE_LEN -1);
Roietronics 0:8326629a1b97 157
Roietronics 0:8326629a1b97 158 if(dataBuffer[0] == 0x4d){
Roietronics 0:8326629a1b97 159 if(checkValue(dataBuffer,MESSAGE_LEN)){
Roietronics 0:8326629a1b97 160 PM01Value=transmitPM01(dataBuffer); //count PM1.0 value of the air detector module
Roietronics 0:8326629a1b97 161 PM2_5Value=transmitPM2_5(dataBuffer);//count PM2.5 value of the air detector module
Roietronics 0:8326629a1b97 162 PM10Value=transmitPM10(dataBuffer); //count PM10 value of the air detector module
Roietronics 0:8326629a1b97 163 }
Roietronics 0:8326629a1b97 164 }
Roietronics 0:8326629a1b97 165 }
Roietronics 0:8326629a1b97 166
Roietronics 0:8326629a1b97 167 char input = pc.getc();
Roietronics 0:8326629a1b97 168 if(input == 'Q' || input == 'q')
Roietronics 0:8326629a1b97 169 {
Roietronics 0:8326629a1b97 170 t.stop();
Roietronics 0:8326629a1b97 171 writeBuffer(stopCommand, 4);
Roietronics 0:8326629a1b97 172 logInfo("Exit request received");
Roietronics 0:8326629a1b97 173 return 0;
Roietronics 0:8326629a1b97 174 }
Roietronics 0:8326629a1b97 175 static unsigned long OledTimer= t.read_ms();
Roietronics 0:8326629a1b97 176 if (t.read_ms() - OledTimer >=1000)
Roietronics 0:8326629a1b97 177 {
Roietronics 0:8326629a1b97 178 OledTimer= t.read_ms();
Roietronics 0:8326629a1b97 179
Roietronics 1:8cad8f7852d4 180 pc.printf("PM1.0: %d ug/m3", PM01Value);
Roietronics 0:8326629a1b97 181 // debug.print(PM01Value);
Roietronics 0:8326629a1b97 182 // debug.println(" ug/m3");
Roietronics 0:8326629a1b97 183
Roietronics 1:8cad8f7852d4 184 pc.printf("PM2.5: %d ug/m3", PM2_5Value);
Roietronics 0:8326629a1b97 185 // debug.print(PM2_5Value);
Roietronics 0:8326629a1b97 186 // debug.println(" ug/m3");
Roietronics 0:8326629a1b97 187
Roietronics 1:8cad8f7852d4 188 pc.printf("PM10: %d ug/m3", PM10Value);
Roietronics 0:8326629a1b97 189 // debug.print(PM10Value);
Roietronics 0:8326629a1b97 190 // debug.println(" ug/m3");
Roietronics 1:8cad8f7852d4 191 pc.printf("\n");
Roietronics 0:8326629a1b97 192
Roietronics 0:8326629a1b97 193 }
Roietronics 0:8326629a1b97 194 }
Roietronics 0:8326629a1b97 195 }