Merge pull request #3 from armku/master

增加NPA数字压力传感器驱动，IIC 型号：NPA_700B_015A

Drivers/I2C/NPA/NPA_700B_015A.cpp

@@ -0,0 +1,42 @@
+#include "NPA_700B_015A.h"
+
+NPA_700B_015A::NPA_700B_015A()
+{
+	this->IIC = nullptr;
+	this->Address = 0X51;
+}
+
+void NPA_700B_015A::Init()
+{
+	debug_printf("\r\nAT24CXX::Init Address=0x%02X \r\n", Address);
+
+	this->IIC->SubWidth = 1;
+	this->IIC->Address = this->Address;
+	this->IIC->Open();
+}
+
+int NPA_700B_015A::Read()
+{
+	byte buf1, buf2;
+	int buf;
+	buf1 = 0;
+	buf2 = 0;
+	this->IIC->Start();
+	this->IIC->WriteByte(Address);
+	if (!this->IIC->WaitAck(true))
+	{
+		return  -1;
+	}
+	buf1 = this->IIC->ReadByte();
+	this->IIC->Ack(true);
+	buf2 = this->IIC->ReadByte();
+	this->IIC->Ack(false);
+	this->IIC->Stop();
+	buf = (buf1 << 8) | buf2;
+	return buf;
+}
+//¶ÁÈ¡´óÆøѹֵ
+float NPA_700B_015A::ReadP()
+{
+	return this->Read() * 0.007278646;
+}

Drivers/I2C/NPA/NPA_700B_015A.h

@@ -0,0 +1,18 @@
+#ifndef _NPA_H
+#define _NPA_H
+
+#include "I2C.h"
+//压力传感器 NPA-700B-015A
+class NPA_700B_015A
+{
+public:
+	SoftI2C* IIC;
+
+	NPA_700B_015A();
+	int Read();
+	float ReadP();//读取大气压值
+	void Init();
+private:	
+	byte Address; //设备地址
+};
+#endif