inital commit working

dht11.cpp

@@ -0,0 +1,79 @@
+#include "dht11.h"
+
+Dht11::Dht11(volatile unsigned char *port, volatile unsigned char *inPort, volatile unsigned char *port_ctl, const unsigned char pin): _port(port), _inPort(inPort), _port_ctl(port_ctl), _pin(pin)
+{}
+
+uint8_t Dht11::read()
+{
+	// BUFFER TO RECEIVE
+	uint8_t bits[5];
+	uint8_t cnt = 7;
+	uint8_t idx = 0;
+
+	// EMPTY BUFFER
+	for (uint8_t i=0; i< 5; i++) bits[i] = 0;
+
+	// REQUEST SAMPLE
+	setDirection(_port_ctl, _pin, true);
+	writePin(_port, _pin, false);
+	_delay_ms(2);
+	writePin(_port, _pin, true);
+	setDirection(_port_ctl, _pin, false);
+	_delay_us(42);
+	
+
+	// ACKNOWLEDGE or TIMEOUT
+	unsigned int loopCnt = LOOP_TIMEOUT_COUNT;
+	while(!readPin(_inPort, _pin))
+		if (loopCnt-- == 0) return 1;
+
+	loopCnt = LOOP_TIMEOUT_COUNT;
+	while(readPin(_inPort, _pin) )
+		if (loopCnt-- == 0) return 2;
+
+	// READ OUTPUT - 40 BITS => 5 BYTES or TIMEOUT
+	for (uint8_t i=0; i<40; i++)
+	{
+		loopCnt = LOOP_TIMEOUT_COUNT;
+		while(!readPin(_inPort, _pin))
+			if (loopCnt-- == 0) return 3;
+
+		loopCnt = 0;
+		while(readPin(_inPort, _pin))
+		{
+			_delay_us(10);
+			if (loopCnt++ > LOOP_TIMEOUT_SMALL_COUNT) return 4;
+		}
+
+		if( loopCnt > BIT_COUNT )bits[idx] |= (1 << cnt);
+		if (cnt == 0)   // next byte?
+		{
+			cnt = 7;    // restart at MSB
+			idx++;      // next byte!
+		}
+		else cnt--;
+	}
+
+	// WRITE TO RIGHT VARS
+        // as bits[1] and bits[3] are allways zero they are omitted in formulas.
+	uint8_t sum;
+	if constexpr(DHT22) sum= bits[0] + bits[1] + bits[2] + bits[3];
+	else sum = bits[1] + bits[3];
+	
+	if(bits[4] == sum && sum != 0)
+	{
+		if constexpr(DHT22)
+		{
+			humidity    = (static_cast<uint16_t>(bits[0]) << 8) + bits[1]; 
+			temperature = (static_cast<uint16_t>((bits[2] & 0b01111111) << 8) + bits[3]);
+			if(bits[2] & 0b10000000) temperature=temperature*-1;
+		}
+		else
+		{
+			humidity = bits[1];
+			temperature = bits[3]*10;
+		}
+		return 0;
+	}
+	else return 5;
+}