Diff: CCS811.cpp

Revision:

2:ec392b3a49f2

Parent:

1:57eb62ded32d

Child:

3:423f2830684e

--- a/CCS811.cpp	Fri Apr 27 09:51:20 2018 +0000
+++ b/CCS811.cpp	Thu Mar 05 08:27:24 2020 +0000
@@ -7,25 +7,62 @@
 /**
  ** Initial CCS811 need write MODE register and should Write APP START register to begin measurement.
  **/
-void CCS811::init() {
+int CCS811::init() {
     char send[2];
     
     if (!checkHW()) {
-        return;
+        m_pc.printf("ERROR: CCS811 does not have a correct hardware id.\r\n");
+        return CCS811_ERR_HWID;
     }else {
         m_pc.printf("CCS811 is confirm!\r\n");    
     }
     
+    // check valid app
+    send[0] = CCS811_REG_STATUS;
+    m_i2c.write(CCS811_I2C_ADDR, send, 1);
+    m_i2c.read(CCS811_I2C_ADDR, send, 1);
+    if (!(send[0] & 0x10)){
+        return CCS811_ERR_INVALID_APP;
+    }
+    
+    // send app start
     send[0] = CCS811_REG_APP_START;
     send[1] = 0x00;
+    m_i2c.write(CCS811_I2C_ADDR, send, 1);
     
-    m_i2c.write(CCS811_I2C_ADDR, send, 2);
+    m_pc.printf("done setting app start\r\n");
+    {
+        char status = readStatus();
+        if (status & 0x01){
+            char errid = readErr();
+            printerr_reg1(m_pc, errid);
+        }
+    }
+    
+    // check fw mode
+    send[0] = CCS811_REG_STATUS;
+    m_i2c.write(CCS811_I2C_ADDR, send, 1);
+    m_i2c.read(CCS811_I2C_ADDR, send, 1);
+    if (!(send[0] & 0x90)){
+        return CCS811_ERR_INVALID_APPMODE;
+    }
+    
+
     
     send[0] = CCS811_REG_MEAS_MODE;
     send[1] = CCS811_MEASUREMENT_MODE1;
     
     m_i2c.write(CCS811_I2C_ADDR, send, 2);
-    
+    m_pc.printf("setting meas mode\r\n");
+    {
+        char status = readStatus();
+        if (status & 0x01){
+            char errid = readErr();
+            printerr_reg1(m_pc, errid);
+        }
+    }
+    m_pc.printf("done set meas mode\r\n");
+    return 0;
 }
 
 int CCS811::setMeasureMode(char mode) {
@@ -66,6 +103,11 @@
     *ECO2 = (uint16_t) (recv[0] <<8) + recv[1];
     *TVOC = (uint16_t) (recv[2] <<8) + recv[3];
     
+    char err_id = recv[5];
+    if(err_id != 0){
+        printerr_reg1(m_pc, err_id);
+    }
+    
     return 0;
     
 }
@@ -83,8 +125,6 @@
     m_i2c.write(CCS811_I2C_ADDR, read, 1, false);
     m_i2c.read(CCS811_I2C_ADDR, hid, 1, false);
     
-//    m_pc.printf("%X\r\n", hid[0]);
-    
     if (hid[0] == 0x81) {
         return true;
     } else {
@@ -106,3 +146,41 @@
       
 }
 
+int CCS811::readErr(){
+    char i2c_buf[2];
+    
+    i2c_buf[0] = CCS811_REG_ERROR_ID;
+    m_i2c.write(CCS811_I2C_ADDR, i2c_buf, 1);
+    m_i2c.read(CCS811_I2C_ADDR, i2c_buf, 1);
+    return i2c_buf[0];
+}
+
+int CCS811::readStatus(){
+    char i2c_buf[2];
+    
+    i2c_buf[0] = CCS811_REG_STATUS;
+    m_i2c.write(CCS811_I2C_ADDR, i2c_buf, 1);
+    m_i2c.read(CCS811_I2C_ADDR, i2c_buf, 1);
+    return i2c_buf[0];
+}
+
+void printerr(Serial& m_pc, int errid){
+    if (errid == CCS811_ERR_HWID){
+        m_pc.printf("CCS811_ERR_HWID\r\n");
+    }else if(errid == CCS811_ERR_INVALID_APP){
+        m_pc.printf("CCS811_ERR_INVALID_APP\r\n");
+    }else if(errid == CCS811_ERR_INVALID_APPMODE){
+        m_pc.printf("CCS811_ERR_INVALID_APPMODE\r\n");
+    }else if(errid == 0){
+        m_pc.printf("printerr called but no error\r\n");
+        return;
+    }else{
+        m_pc.printf("Unknown error: %d\r\n", errid);
+    }
+    exit(errid);
+}
+
+void printerr_reg1(Serial& m_pc, int errid){
+    m_pc.printf("err reg: %X\r\n", errid);
+    exit(errid);
+}
\ No newline at end of file