add simple TSL2591 illuminance / IR sensor driver

include/driver/tsl2591.h

+/*
+ * Copyright 2020 Daniel Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#ifndef TSL2591_H
+#define TSL2591_H
+
+class TSL2591 {
+	private:
+		TSL2591(const TSL2591 &copy);
+		unsigned char const address = 0x29;
+		unsigned char txbuf[2];
+		unsigned char rxbuf[4];
+
+	public:
+		TSL2591() {}
+
+		unsigned short ch0;
+		unsigned short ch1;
+
+		void init();
+
+		unsigned char getStatus();
+		void read();
+};
+
+extern TSL2591 tsl2591;
+
+#endif

src/app/datalogger/main.cc

@@ -42,6 +42,9 @@
 #ifdef DRIVER_MPU9250
 #include "driver/mpu9250.h"
 #endif
+#ifdef DRIVER_TSL2591
+#include "driver/tsl2591.h"
+#endif
 
 void loop(void)
 {
@@ -127,6 +130,12 @@ void loop(void)
 	kout.printf_float(max44009.getLux());
 	kout << endl;
 #endif
+
+#ifdef DRIVER_TSL2591
+	tsl2591.read();
+	kout << dec << "TSL2591 CH0: " << tsl2591.ch0 << " / CH1: " << tsl2591.ch1;
+	kout << hex << "   (status: 0x" << tsl2591.getStatus() << ")" << endl;
+#endif
 }
 
 int main(void)
@@ -211,6 +220,10 @@ int main(void)
 	mpu9250.init();
 #endif
 
+#ifdef DRIVER_TSL2591
+	tsl2591.init();
+#endif
+
 	arch.idle_loop();
 
 	return 0;

src/driver/tsl2591.cc

+/*
+ * Copyright 2020 Daniel Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include "driver/tsl2591.h"
+#if defined(MULTIPASS_ARCH_HAS_I2C) && !defined(DRIVER_SOFTI2C)
+#include "driver/i2c.h"
+#else
+#include "driver/soft_i2c.h"
+#endif
+
+void TSL2591::init()
+{
+	txbuf[0] = 0xa0;
+	txbuf[1] = 0x03;
+	i2c.xmit(address, 2, txbuf, 0, rxbuf);
+	txbuf[0] = 0xa1;
+	txbuf[1] = 0x01; // 200ms integration time
+	i2c.xmit(address, 2, txbuf, 0, rxbuf);
+}
+
+void TSL2591::read()
+{
+	txbuf[0] = 0xb4;
+	i2c.xmit(address, 1, txbuf, 4, rxbuf);
+	ch0 = (rxbuf[1] << 8) + rxbuf[0];
+	ch1 = (rxbuf[3] << 8) + rxbuf[2];
+}
+
+unsigned char TSL2591::getStatus()
+{
+	txbuf[0] = 0xb3;
+	i2c.xmit(address, 1, txbuf, 1, rxbuf);
+	return rxbuf[0];
+}
+
+TSL2591 tsl2591;