Diff: CCS811.cpp

Revision:

0:2c1dce3543ae

Child:

1:d0abe05bc21e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CCS811.cpp	Mon Sep 06 09:17:14 2021 +0000
@@ -0,0 +1,187 @@
+#include "CCS811.h"
+
+// Constructeur
+CCS811::CCS811(PinName sda, PinName scl) : _i2c(sda, scl) {}
+
+/**
+ ** Initial CCS811 need write MODE register and should Write APP START register to begin measurement.
+ **/
+
+void CCS811::init()
+{
+    wait_us(50);
+
+    char send[2];
+    char read[8];
+    char hwv[8];
+    char hwd[8];
+
+    read[0] = CCS811_REG_STATUS; //0x00
+
+    _i2c.write(CCS811_I2C_ADDR, read, 1);
+    _i2c.read(CCS811_I2C_ADDR, hwv, 1);
+
+    wait_us(50);
+
+    send[0] = CCS811_REG_APP_START; //0xF4
+
+    wait_us(50);
+
+    _i2c.write(CCS811_I2C_ADDR, send, 1);
+
+    wait_us(50);
+
+    read[0] = CCS811_REG_STATUS; //0x00
+
+    wait_us(50);
+
+    _i2c.write(CCS811_I2C_ADDR, read, 1);
+    _i2c.read(CCS811_I2C_ADDR, hwd, 1);
+
+    wait_us(50);
+
+
+    send[0] = CCS811_REG_MEAS_MODE; //0x01
+    send[1] = CCS811_MEASUREMENT_MODE1; //0x10
+
+    _i2c.write(CCS811_I2C_ADDR, send, 2);
+    wait_us(50);
+
+    wait_us(50);
+
+
+    read[0] = CCS811_REG_STATUS; //0x00
+
+    wait_us(50);
+
+
+    _i2c.write(CCS811_I2C_ADDR, read, 1);
+    _i2c.read(CCS811_I2C_ADDR, hwd, 1);
+
+    wait_us(50);
+}
+
+int CCS811::setMeasureMode(char mode)
+{
+
+    char send[2];
+
+    send[0] = CCS811_REG_MEAS_MODE;
+    send[1] = mode;
+
+    _i2c.write(CCS811_I2C_ADDR, send, 2);
+
+//  send[0] = CCS811_REG_APP_START;
+//  send[1] = 0x00;
+
+//  _i2c.write(CCS811_I2C_ADDR, send, 2);
+
+    return 0;
+}
+
+bool CCS811::readstatus()
+{
+
+    char read[8];
+    char hwd[8];
+
+    read[0] = CCS811_REG_STATUS; //0x00
+
+    _i2c.write(CCS811_I2C_ADDR, read, 1);
+    _i2c.read(CCS811_I2C_ADDR, hwd, 1);
+
+    printf("STATUS 0x%X\r\n", hwd[0]);
+
+    return 0;
+}
+
+bool CCS811::readmeas()
+{
+
+    char read[8];
+    char hwd[8];
+
+    read[0] = CCS811_REG_MEAS_MODE; //0x01
+
+    _i2c.write(CCS811_I2C_ADDR, read, 1);
+    _i2c.read(CCS811_I2C_ADDR, hwd, 1);
+
+    printf("meas 0x%X\r\n", hwd[0]);
+
+    return 0;
+}
+
+bool CCS811::readerror()
+{
+
+    char read[8];
+    char hwv[8];
+
+    read[0] = CCS811_REG_ERROR_ID; //0xE0
+
+    _i2c.write(CCS811_I2C_ADDR, read, 1);
+    _i2c.read(CCS811_I2C_ADDR, hwv, 1);
+
+    printf("error 0x%X \r\n", hwv[0]);
+
+    return 0;
+}
+
+//Lecture de CCS811 : taux de CO2 en ppm et taux de tvos en bbm (unsigned)
+
+int CCS811::readData(uint16_t *ECO2, uint16_t *TVOC)
+{
+    char recv[8];
+    char send[1];
+
+    send[0] = CCS811_REG_ALG_RESULT_DATA;
+    _i2c.write(CCS811_I2C_ADDR, send, 1, true);
+    _i2c.read(CCS811_I2C_ADDR, recv, 8, false);
+    wait_us(1);
+
+//    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;
+
+}
+
+
+//vérifier CCS811 du bus i2c
+
+bool CCS811::checkHW()
+{
+    char read[1];
+    char hid[1];
+
+    read[0] = CCS811_REG_HW_ID;
+
+    _i2c.write(CCS811_I2C_ADDR, read, 1, false);
+    _i2c.read(CCS811_I2C_ADDR, hid, 1, false);
+
+//    pc.printf("%X\r\n", hid[0]);
+
+    if (hid[0] == 0x81) {
+        return true;
+    } else {
+        return false;
+    }
+
+}
+
+
+bool CCS811::softRest()
+{
+
+    char rstCMD[5] = {CCS811_REG_SW_RESET, 0x11,0xE5,0x72,0x8A};
+
+    _i2c.write(CCS811_I2C_ADDR, rstCMD, 5);
+
+    return false;
+
+}