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Note As you will see later in this example, methods that use JIT activation do not work correctly if they

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The thing to keep in mind is that even though we mere humans think about the layout of the LCD in terms of rows and columns, inside the controller the Display Register is just a single long row of memory addresses Different sections of that memory space map to different rows on the display, so to set the desired location on the display, we need to figure out the offset in the Display Register corresponding to that location The base memory address of the Display Register is 0x80, corresponding to the very first character position on the very first row Other positions on the display are all offset from this base address.

maintain state between calls. A stateful method is used in this example only to demonstrate this; it is not meant as the recommended way to implement this method.

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To position the cursor we, therefore, need to send a command to the LCD telling it to select Display Register address 0x80 plus the necessary offset, so we need to process the requested X/Y position to determine what that offset needs to be The actual memory addresses for the first character position in each of the four rows on a four-row display are as follows, starting from the top and including the 0x80 base memory address for the Display Register: 0x80 + 0x00 (row 0) 0x80 + 0x40 (row 1) 0x80 + 0x14 (row 2) 0x80 + 0x54 (row 3) The simplest scenario is to jump to a character position on the first row, in which case the address offset is simply the number of positions along that we want to move the cursor.

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Next, we develop two classes that implement this interface. One does not use JIT activation, and the other does. The goal of this example is to see the difference that JIT activation makes on the state of an object between method calls. Here is the non-JIT class implementation: [ClassInterface(ClassInterfaceType.None)] public class DniScNotJITObj : ServicedComponent, IJITMethods { private int m_Number; public void AddNumber(int number) { m_Number += number; } public int GetTotal() { return m_Number; } public int AddSomeNumbers(int numA, int numB) { return numA + numB; } } and here is the JIT version: [ClassInterface(ClassInterfaceType.None)] [JustInTimeActivation] public class DniScJITObj : ServicedComponent, IJITMethods { private int m_Number; [AutoComplete] public void AddNumber(int number) { m_Number += number; }

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[AutoComplete] public int GetTotal() { return m_Number; } [AutoComplete] public int AddSomeNumbers(int numA, int numB) { return numA + numB; } } The only difference (other than class name) is the addition of the JustInTimeActivation and AutoComplete attributes as discussed earlier. Without the AutoComplete attribute, the object would not be considered done when the method returns. If it isn t done, then it won t be deactivated and the benefits of JIT activation won t be seen.

We can totally ignore the Y value because the row offset is 0, simply adding the 0x80 Display Register base address to the X value to get the memory address So the function starts by simply adding the base address and the X position into the variable dr to calculate the initial required Display Register address This stage is the same no matter which row is required, so this calculation is always performed void lcd_gotoXY(byte x, byte y) { byte dr = 0x80 + x; If the Y value is 0 and the required position is, therefore, on the first row, that s it! Job done The dr variable will now hold the correct Display Register address However, if Y is greater than zero it means we need to add an extra offset depending on the required row.

Note As an alternative to the AutoComplete attribute, the ContextUtil.DeactivateOnReturn property could have been set to true. For example, the AddNumber method could have been implemented like this with the same effect:

This can be done using a couple of simple bitwise operators applied to the requested Y value It might look cryptic, but it ll all make sense in a moment..

public void AddNumber(int number) { m_Number += number; ContextUtil.DeactivateOnReturn = true; }

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