Revision 0:b5dbfc21185d, committed 2017-06-27

Comitter:

johnathanlyu

Date:

Tue Jun 27 05:17:02 2017 +0000

Child:

1:4acc5b63a984

Commit message:

initial MtConnect04s with MtSense02 version

Changed in this revision

--- /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;
+      
+}
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CCS811.h	Tue Jun 27 05:17:02 2017 +0000
@@ -0,0 +1,50 @@
+#ifndef CCS811_H
+#define CCS811_H
+
+//CCS811 register define
+#define CCS811_I2C_ADDR                 0xB4
+#define CCS811_REG_STATUS               0x00    //Status.
+#define CCS811_REG_MEAS_MODE            0x01    //Mesurement mode and conditions register.
+#define CCS811_REG_ALG_RESULT_DATA      0x02    //Algorithm result. 2 bytes co2 ppm next 2 bytes ppb VOC level.
+#define CCS811_REG_RAW_DATA             0x03    //Raw ADC data.
+#define CCS811_REG_ENV_DATA             0x05    //Temperature and humidity data can be write to enavle compensation.
+#define CCS811_REG_NTC                  0x06    //Provides the voltage across the reference registor and the voltage across the NTC resistor.
+#define CCS811_REG_THRESHOLDS           0x10    //Thresholds for operation when interrupts are only generated when eCO2 ppm crosses a threshold.
+#define CCS811_REG_BASELINE             0x11    //The encoded current baseline value can be read.A previously saved encoded baseline can be written.
+#define CCS811_REG_HW_ID                0x20    //Hardware ID. The value is 0x81.
+#define CCS811_REG_HW_VERSION           0x21    //Hardware version. The value is 0x1X.
+#define CCS811_REG_BOOT_VERSION         0x23    //Firmware boot version. The First 2 bytes contain the firmware version number for the boot code.
+#define CCS811_REG_APP_VERSION          0x24    //Firmware application version. The first 2 bytes contain the firmware version number for the application code.
+#define CCS811_REG_ERROR_ID             0xE0    //Error ID. When the status register reports and error its source is lcated in this register.
+#define CCS811_REG_APP_START            0xF4    //Application start. Used to transition the CCS811 state from boot to application mode, a write with no data is required. Before performing a write to APP_START the Status register should be accessed to check if there is a valid application present.
+#define CCS811_REG_SW_RESET             0xFF    //If the correct 4 byres (0x11, 0xE5, 0x72, 0x8A)are written to this register in a single sequence the device will reset and return to BOOT bode.
+
+//mode setting
+#define CCS811_MEASUREMENT_MODE0        0x00    //Idle(Measurements are disabled in this mode).
+#define CCS811_MEASUREMENT_MODE1        0x10    //Constant power mode, IAQ measurement every second.
+#define CCS811_MEASUREMENT_MODE2        0x20    //Pulse heating mode IAQ measurement every 10 seconds.
+#define CCS811_MEASUREMENT_MODE3        0x30    //Low power pulse heating mode IAQ measurement every 60 seconds.
+#define CCS811_MEASUREMENT_MODE4        0x40    //Constant power mode, sensor measurement every 250ms. 1xx: Reserved modes (For future use).
+
+//Interrupt control 
+#define CCS811_INT_DATARDY              0x08    //At the end of each measurement cycle (250ms, 1s, 10s, 60s) a flag is set in the STATUS register regardless of the setting of this bit.
+#define CCS811_INT_THRESH               0x04    //0: Interrupt mode (if enabled) operates normally 1: Interrupt mode (if enabled) only asserts the nINT signal (driven low) if the new ALG_RESULT_DATA crosses one of the thresholds set in the THRESHOLDS register by more than the hysteresis value (also in the THRESHOLDS register).
+
+#include "mbed.h"
+
+class CCS811 {
+    public:
+        CCS811(I2C& i2c);
+        void init();
+        int setMeasureMode(char mode);
+        int readData(uint16_t *ECO2, uint16_t *TVOC);
+        bool checkHW();
+        bool softRest();
+    protected:
+        I2C m_i2c;
+        Serial pc;
+    private:
+};
+
+
+#endif
\ No newline at end of file