Commit cf97c185 authored by Birte Kristina Friesel's avatar Birte Kristina Friesel
Browse files

add initialization and readout to CCS811 driver

parent 1f1d47d6

include/driver/ccs811.h

+19 −5
Original line number Diff line number Diff line
@@ -9,15 +9,29 @@ 
class CCS811 {

	private:

		CCS811(const CCS811 &copy);

		unsigned char const address;

		unsigned char txbuf[3];

		unsigned char rxbuf[2];

		unsigned char const address = 0x5a;

		unsigned char txbuf[5];

		unsigned char rxbuf[8];



	public:

		CCS811(unsigned char const addr) : address(addr) {}

		CCS811() {}



		unsigned short eco2;

		unsigned short tvoc;

		unsigned char status;

		unsigned char error_id;

		unsigned char raw_current;

		unsigned short raw_voltage;



		void init();

		short check();

		unsigned char getStatus();

		unsigned char getError();

		unsigned char getManufacturerID();

		void startFirmware();

		void setMode(unsigned char mode);

		void read();

		void setEnv(unsigned char humi, unsigned char humi_fraction, unsigned char temp, unsigned char temp_fraction);

		void reset();

};



extern CCS811 ccs811;

src/app/i2cdetect/main.cc

+17 −1
Original line number Diff line number Diff line
@@ -125,7 +125,13 @@ void loop(void) 
	kout << "BME680 gas resistance " << data.gas_resistance << endl;

#endif

#ifdef DRIVER_CCS811

	kout << "CCS811 status is " << ccs811.check() << endl;

	ccs811.read();

	kout << "CCS811 eCO₂ : " << ccs811.eco2 << " ppm" << endl;

	kout << "CCS811 tVOC : " << ccs811.tvoc << " ppb" << endl;

	kout << bin;

	kout << "CCS811 status: " << ccs811.status << endl;

	kout << "CCS811 error: " << ccs811.error_id << endl;

	kout << dec;

#endif

#ifdef DRIVER_HDC1080

	/*
@@ -186,7 +192,17 @@ int main(void) 
	kout << "I2C setup OK" << endl;



#ifdef DRIVER_CCS811

	kout << hex;

	kout << "CCS811 HWID: " << ccs811.getManufacturerID() << endl;

	arch.delay_ms(65);

	kout << "CCS811 status: " << ccs811.getStatus() << endl;

	arch.delay_ms(65);

	ccs811.init();

	arch.delay_ms(65);

	kout << "CCS811 status: " << ccs811.getStatus() << endl;

	kout << dec;

	ccs811.setMode(1);

	//arch.delay_ms(50);

#endif

#ifdef DRIVER_HDC1080

	hdc1080.init();

src/driver/ccs811.cc

+65 −7
Original line number Diff line number Diff line
@@ -17,18 +17,76 @@ 


void CCS811::init()

{

	gpio.output(nWAKE);

	gpio.write(nWAKE, 1);

	startFirmware();

	//setMode(1);

	//setEnv(50, 0, 0, 0);

}



short CCS811::check()

// switch to Application mode

void CCS811::startFirmware()

{

	if (getStatus() & 0x10) {

		txbuf[0] = 0xf4;

		i2c.xmit(address, 1, txbuf, 0, rxbuf);

	}

}



unsigned char CCS811::getManufacturerID()

{

	gpio.write(nWAKE, 0);

	txbuf[0] = 0x20;

	rxbuf[0] = 0;

	i2c.xmit(address, 1, txbuf, 1, rxbuf);

	gpio.write(nWAKE, 1);

	return rxbuf[0];

}



CCS811 ccs811(0x5a);
 
void CCS811::setMode(unsigned char mode)

{

	txbuf[0] = 0x01;

	txbuf[1] = (mode & 0x07) << 4;

	i2c.xmit(address, 2, txbuf, 0, rxbuf);

}



void CCS811::read()

{

	txbuf[0] = 0x02;

	i2c.xmit(address, 1, txbuf, 8, rxbuf);

	eco2 = (rxbuf[0] << 8) + rxbuf[1];

	tvoc = (rxbuf[2] << 8) + rxbuf[3];

	status = rxbuf[4];

	error_id = rxbuf[5];

}



void CCS811::setEnv(unsigned char humi, unsigned char humi_fraction, unsigned char temp, unsigned char temp_fraction)

{

	txbuf[0] = 0x05;

	txbuf[1] = humi;

	txbuf[2] = humi_fraction;

	txbuf[3] = temp; //((temp - 25) << 1) + (((temp - 25) & 0x80) >> 7);

	txbuf[4] = temp_fraction; //(temp << 1) + ((temp & 0x80) >> 7);

	i2c.xmit(address, 5, txbuf, 0, rxbuf);

}



unsigned char CCS811::getStatus()

{

	txbuf[0] = 0x00;

	i2c.xmit(address, 1, txbuf, 1, rxbuf);

	return rxbuf[0];

}



unsigned char CCS811::getError()

{

	txbuf[0] = 0xe0;

	i2c.xmit(address, 1, txbuf, 1, rxbuf);

	return rxbuf[0];

}



// switch to Bootloader mode

void CCS811::reset()

{

	txbuf[0] = 0xff;

	txbuf[1] = 0x11;

	txbuf[2] = 0xe5;

	txbuf[3] = 0x72;

	txbuf[4] = 0x8a;

}



CCS811 ccs811;