EaserCAT-7000 initial

Cards/EaserCAT-7000-DIO+THCAD+I2C/Firmware/include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

Cards/EaserCAT-7000-DIO+THCAD+I2C/Firmware/include/extend32to64.h

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+#ifndef EXTEND32TO64
+#define EXTEND32TO54
+
+#include <Arduino.h>
+
+class extend32to64
+{
+public:
+    int64_t previousTimeValue = 0;
+    const uint64_t ONE_PERIOD = 4294967296;  // almost UINT32_MAX;
+    const uint64_t HALF_PERIOD = 2147483648; // Half of that
+    int64_t extendTime(uint32_t in);
+};
+#endif