Diff: CCS811.cpp

Revision:

0:b5dbfc21185d

Child:

1:57eb62ded32d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CCS811.cpp	Tue Jun 27 05:17:02 2017 +0000
@@ -0,0 +1,108 @@
+#include "CCS811.h"
+
+CCS811::CCS811(I2C& i2c) : m_i2c(i2c), pc(p5, p4) {
+    
+}
+
+/**
+ ** Initial CCS811 need write MODE register and should Write APP START register to begin measurement.
+ **/
+void CCS811::init() {
+    char send[2];
+    
+    if (!checkHW()) {
+        return;
+    }else {
+        pc.printf("CCS811 is confirm!\r\n");    
+    }
+    
+    send[0] = CCS811_REG_MEAS_MODE;
+    send[1] = CCS811_MEASUREMENT_MODE1;
+    
+    m_i2c.write(CCS811_I2C_ADDR, send, 2);
+    
+    send[0] = CCS811_REG_APP_START;
+    send[1] = 0x00;
+    
+    m_i2c.write(CCS811_I2C_ADDR, send, 2);
+    
+}
+
+int CCS811::setMeasureMode(char mode) {
+    
+    char send[2];
+    
+    send[0] = CCS811_MEASUREMENT_MODE1;
+    send[1] = mode;
+    
+    m_i2c.write(CCS811_I2C_ADDR, send, 2);
+    
+    send[0] = CCS811_REG_APP_START;
+    send[1] = 0x00;
+    
+    m_i2c.write(CCS811_I2C_ADDR, send, 2);
+    
+    return 0;
+}
+
+/**
+ ** Here is that you can read CCS811 with co2 ppm and tvoc bbm is unsigned value
+ **/
+int CCS811::readData(uint16_t *ECO2, uint16_t *TVOC) {
+    
+    char recv[8];
+    
+    
+    
+    recv[0] = CCS811_REG_ALG_RESULT_DATA;
+    m_i2c.write(CCS811_I2C_ADDR, recv, 1);
+    m_i2c.read( CCS811_I2C_ADDR, recv, 8);
+
+//    pc.printf("%X %X\r\n", recv[0], recv[1]);
+//    pc.printf("%X %X\r\n", recv[2], recv[3]);
+//    pc.printf("%X %X\r\n", recv[4], recv[5]);
+//    pc.printf("%X %X\r\n", recv[6], recv[7]);
+    
+    *ECO2 = (uint16_t) (recv[0] <<8) + recv[1];
+    *TVOC = (uint16_t) (recv[2] <<8) + recv[3];
+    
+    return 0;
+    
+}
+
+/**
+ ** Here for check is CCS811 hardware from i2c bus
+ **/
+bool CCS811::checkHW() {
+
+    char read[1];
+    char hid[1];
+    
+    read[0] = CCS811_REG_HW_ID;
+    
+    m_i2c.write(CCS811_I2C_ADDR, read, 1, false);
+    m_i2c.read(CCS811_I2C_ADDR, hid, 1, false);
+    
+//    pc.printf("%X\r\n", hid[0]);
+    
+    if (hid[0] == 0x81) {
+        return true;
+    } else {
+        return false;
+    }
+    
+}
+
+/**
+ **  Here is provide you soft reset CCS811 module 
+ **/
+bool CCS811::softRest() {
+     
+    char rstCMD[5] = {CCS811_REG_SW_RESET, 0x11,0xE5,0x72,0x8A};
+
+    m_i2c.write(CCS811_I2C_ADDR, rstCMD, 5);
+    
+    return false;
+      
+}
+