Add pubsub client

2015-09-20 22:59:27 +02:00
parent a304343433
commit 9d398154c7
476 changed files with 69941 additions and 0 deletions
@@ -0,0 +1,135 @@
+/*
+Copyright 2014 Marcus Sorensen <marcus@electron14.com>
+
+This program is licensed under the GNU GPL v2
+*/
+#include "Arduino.h"
+#include "SI7021.h"
+#include <Wire.h>
+
+#define I2C_ADDR 0x40
+
+// I2C commands
+byte RH_READ[]           = { 0xE5 };
+byte TEMP_READ[]         = { 0xE3 };
+byte POST_RH_TEMP_READ[] = { 0xE0 };
+byte RESET[]             = { 0xFE };
+byte USER1_READ[]        = { 0xE7 };
+byte USER1_WRITE[]       = { 0xE6 };
+byte SERIAL1_READ[]      = { 0xFA, 0x0F };
+byte SERIAL2_READ[]      = { 0xFC, 0xC9 };
+
+bool _si_exists = false;
+
+SI7021::SI7021() {
+}
+
+bool SI7021::begin() {
+    Wire.begin();
+    Wire.beginTransmission(I2C_ADDR);
+    if (Wire.endTransmission() == 0) {
+        _si_exists = true;
+    }
+    return _si_exists;
+}
+
+bool SI7021::sensorExists() {
+    return _si_exists;
+}
+
+int SI7021::getFahrenheitHundredths() {
+    unsigned int c = getCelsiusHundredths();
+    return (1.8 * c) + 3200;
+}
+
+int SI7021::getCelsiusHundredths() {
+    byte tempbytes[2];
+    _command(TEMP_READ, tempbytes);
+    long tempraw = (long)tempbytes[0] << 8 | tempbytes[1];
+    return ((17572 * tempraw) >> 16) - 4685;
+}
+
+int SI7021::_getCelsiusPostHumidity() {
+    byte tempbytes[2];
+    _command(POST_RH_TEMP_READ, tempbytes);
+    long tempraw = (long)tempbytes[0] << 8 | tempbytes[1];
+    return ((17572 * tempraw) >> 16) - 4685;
+}
+
+
+unsigned int SI7021::getHumidityPercent() {
+    byte humbytes[2];
+    _command(RH_READ, humbytes);
+    long humraw = (long)humbytes[0] << 8 | humbytes[1];
+    return ((125 * humraw) >> 16) - 6;
+}
+
+unsigned int SI7021::getHumidityBasisPoints() {
+    byte humbytes[2];
+    _command(RH_READ, humbytes);
+    long humraw = (long)humbytes[0] << 8 | humbytes[1];
+    return ((12500 * humraw) >> 16) - 600;
+}
+
+void SI7021::_command(byte * cmd, byte * buf ) {
+    _writeReg(cmd, sizeof cmd);
+    _readReg(buf, sizeof buf);
+}
+
+void SI7021::_writeReg(byte * reg, int reglen) {
+    Wire.beginTransmission(I2C_ADDR);
+    for(int i = 0; i < reglen; i++) {
+        reg += i;
+        Wire.write(*reg); 
+    }
+    Wire.endTransmission();
+}
+
+int SI7021::_readReg(byte * reg, int reglen) {
+    Wire.requestFrom(I2C_ADDR, reglen);
+    while(Wire.available() < reglen) {
+    }
+    for(int i = 0; i < reglen; i++) { 
+        reg[i] = Wire.read(); 
+    }
+    return 1;
+}
+
+//note this has crc bytes embedded, per datasheet, so provide 12 byte buf
+int SI7021::getSerialBytes(byte * buf) {
+    _writeReg(SERIAL1_READ, sizeof SERIAL1_READ);
+    _readReg(buf, 6);
+ 
+    _writeReg(SERIAL2_READ, sizeof SERIAL2_READ);
+    _readReg(buf + 6, 6);
+    
+    // could verify crc here and return only the 8 bytes that matter
+    return 1;
+}
+
+int SI7021::getDeviceId() {
+    byte serial[12];
+    getSerialBytes(serial);
+    int id = serial[6];
+    return id;
+}
+
+void SI7021::setHeater(bool on) {
+    byte userbyte;
+    if (on) {
+        userbyte = 0x3E;
+    } else {
+        userbyte = 0x3A;
+    }
+    byte userwrite[] = {USER1_WRITE[0], userbyte};
+    _writeReg(userwrite, sizeof userwrite);
+}
+
+// get humidity, then get temperature reading from humidity measurement
+struct si7021_env SI7021::getHumidityAndTemperature() {
+    si7021_env ret = {0, 0, 0};
+    ret.humidityPercent          = getHumidityPercent();
+    ret.celsiusHundredths        = _getCelsiusPostHumidity();
+    ret.fahrenheitHundredths     = (1.8 * ret.celsiusHundredths) + 3200;
+    return ret;
+}