Add preliminary version of HDC1080 driver (not working reliably yet)

Makefile

@@ -63,6 +63,11 @@ ifneq ($(findstring max44009,${drivers}), )
 	COMMON_FLAGS += -DDRIVER_MAX44009
 endif
 
+ifneq ($(findstring hdc1080,${drivers}), )
+	CXX_TARGETS += src/driver/hdc1080.cc
+	COMMON_FLAGS += -DDRIVER_HDC1080
+endif
+
 ifneq ($(findstring mmsimple,${drivers}), )
 	CXX_TARGETS += src/driver/mmsimple.cc
 	COMMON_FLAGS += -DDRIVER_MMSIMPLE

include/driver/hdc1080.h

+#ifndef HDC1080_H
+#define HDC1080_H
+
+class HDC1080 {
+	private:
+		HDC1080(const HDC1080 &copy);
+		unsigned char const address = 0x40;
+		unsigned char txbuf[3];
+		unsigned char rxbuf[2];
+
+	public:
+		HDC1080() {}
+
+		float getTemp();
+		float getRH();
+		unsigned int getManufacturerID();
+		void init();
+};
+
+extern HDC1080 hdc1080;
+
+#endif

src/app/i2cdetect/main.cc

@@ -25,6 +25,9 @@
 #ifdef DRIVER_MAX44009
 #include "driver/max44009.h"
 #endif
+#ifdef DRIVER_HDC1080
+#include "driver/hdc1080.h"
+#endif
 #ifdef DRIVER_MMSIMPLE
 #include "driver/mmsimple.h"
 #endif
@@ -81,6 +84,10 @@ void loop(void)
 #ifdef DRIVER_CCS811
 	kout << "CCS811 status is " << ccs811.check() << endl;
 #endif
+#ifdef DRIVER_HDC1080
+	kout << "HDC1080 temperature " << hdc1080.getTemp() << " degC" << endl;
+	kout << "HDC1080 humidity " << hdc1080.getRH() << " %H" << endl;
+#endif
 #ifdef DRIVER_MAX44009
 	kout.printf_float(max44009.getLux());
 	kout << endl;
@@ -118,6 +125,12 @@ int main(void)
 #ifdef DRIVER_CCS811
 	ccs811.init();
 #endif
+#ifdef DRIVER_HDC1080
+	hdc1080.init();
+	if (hdc1080.getManufacturerID() != 0x5449) {
+		kout << "[!] invalid HDC1080 manufacturer ID: " << hex << hdc1080.getManufacturerID() << endl;
+	}
+#endif
 
 	for (unsigned char i = 0; i < sizeof(i2c_status)/sizeof(unsigned int); i++) {
 		i2c_status[i] = 0;

src/driver/hdc1080.cc

+#include "driver/hdc1080.h"
+#include "arch.h"
+#if defined(MULTIPASS_ARCH_HAS_I2C) && !defined(DRIVER_SOFTI2C)
+#include "driver/i2c.h"
+#else
+#include "driver/soft_i2c.h"
+#endif
+
+float HDC1080::getTemp()
+{
+	txbuf[0] = 0x00;
+
+	i2c.xmit(address, 1, txbuf, 0, rxbuf);
+
+	arch.delay_ms(10);
+
+	i2c.xmit(address, 0, txbuf, 2, rxbuf);
+
+	return (((unsigned int)rxbuf[0] << 8) | rxbuf[1]) * .00251770019531250000 - 40.;
+}
+
+float HDC1080::getRH()
+{
+	txbuf[0] = 0x01;
+
+	i2c.xmit(address, 1, txbuf, 0, rxbuf);
+
+	arch.delay_ms(10);
+
+	i2c.xmit(address, 0, txbuf, 2, rxbuf);
+
+	return (((unsigned int)rxbuf[0] << 8) | rxbuf[1]) * .00152587890625000000;
+}
+
+unsigned int HDC1080::getManufacturerID()
+{
+	txbuf[0] = 0xfe;
+	i2c.xmit(address, 1, txbuf, 2, rxbuf);
+	return (unsigned int)rxbuf[0] << 8 | rxbuf[1];
+}
+
+void HDC1080::init()
+{
+	txbuf[0] = 0x02;
+	txbuf[1] = 0x08;
+	txbuf[2] = 0x00;
+	i2c.xmit(address, 3, txbuf, 0, rxbuf);
+	arch.delay_ms(15);
+}
+
+HDC1080 hdc1080;