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Figure 3.21 The Watch window allows you to observe and change the contents of various registers (and variables) during program simulation, debugging, or emulation.
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MPLAB has the capability of displaying speci c register and bit contents in the PIC microcontroller. The Watch windows, such as the one shown in Fig. 3.21, allow you to select the registers to monitor and optionally update. The format of the data displayed in the Watch window can be speci ed to best illustrate the contents of the register or variable. Along with the Watch window, you could specify the File Registers window, but this one takes the guesswork out of guring out which register you want to look at and the actual value of its contents. By clicking on the value of the register, a cursor will appear and you can change the contents of the register in the Watch window. The Watch window is a very useful tool when you are debugging an application and will help you understand exactly what is going on in the PIC microcontroller when your code is running. Creating a Watch window is very simple: click on the View pull-down menu and then select Watch. Once you have the window up and placed on your MPLAB IDE desktop, you can add registers by simply selecting them from the two lists (next to Add SFR and Add Symbol) and then clicking on the buttons to their left. Don t worry if you don t get them in the order you are comfortable in you can drag and drop the register entries in the Watch window to rearrange them. Similarly, if you don t like the data format used for the register or variable, you can change it by right-clicking on the symbol and clicking on Properties, which will give you the dialog box shown in Fig. 3.22. Watch windows should only be started after the application has assembled without any errors, warnings, or messages. If there are errors when the Watch window is created, the
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Figure 3.22 Changing the data format of a Watch window register is accomplished by right-clicking on the symbol and clicking on Properties.
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le register information is not available to MPLAB IDE, and the list of registers available is restricted to the basic set available to the device and will not include any of the registers and variables de ned in the application.
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Stimulus There are very few computer applications of any type, not just PIC micro-
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controller ones, that can run without input of some kind and the ones that do really aren t that interesting. Responding to external events is what makes microcontrollers so important. To demonstrate how an application responds to an external event, you must provide stimulus to the simulated part while the application is running. Unfortunately, when simulating an application, it probably seems overwhelming to learn how to add various inputs, and if you have worked with preversion 7.50 of MPLAB IDE, it probably seemed quite dif cult. After 7.50, though, it is simple and easy to work with. Regardless of the dif culty in creating stimulus for PIC microcontrollers, it s a good idea to do everything in your power to ensure that your applications work correctly before you burn them into a chip. There are four methods of providing stimulus to the PIC microcontroller in MPLAB IDE:
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Asynchronous: Setting a pin, a set of pins, or a register to be driven with a speci c
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value at an arbitrary time, initiated by something like a mouse click.
Synchronous (known as pin/register access): Pins and registers are driven at a spe-
ci c value starting at a speci c point in time (or cycles) for a speci c number of cycles
MICROCHIP MPLAB IDE
(or length of time). Multiple inputs can be made this way. This method is excellent for testing xes to an application to make sure that a speci c set of inputs will not cause a problem. Driving a clock input into the PIC microcontroller: This could be used as either a clock input or as a repeating input. Providing a hardware special function register read, which isn t simulated by MPLAB IDE with a value inserted which can be used to test the operation of the application All of these methods are enabled in the stimulus dialog box by clicking on the Debugger menu and selecting Stimulus and then New Workbook. By doing this, you are enabling stimulus and displaying an input box that you can take advantage of. The most useful form of stimulus when you are rst learning about the PIC microcontroller is the Asynchronous input, shown in Fig. 3.23. This option allows you to click on a button on the Stimulus dialog box and set a pin value. In Fig. 3.23, I have set up an application in which one button sets RB1 high and the other sets this pin low. To enable a pin, you simply click on the rst open element below Pin/SFR and then select the pin or register you want the input to drive. Next, select what you want to do when the button is pressed; for pins, you are given the choice of Set High, Set Low, Toggle, Pulse High, and Pulse Low. For the last two options, you have to select the length of time the pulse is active. When you are nished adding the necessary information for the pin, the gray button to the left gets a chevron (>) added to it as shown in Fig. 3.23 to indicate that it is an active asynchronous stimulus control. Synchronous stimulus (Pin/Register Actions) is a similar process, but instead of responding to a mouse click, the MPLAB IDE simulator produces stimulus based on the number of cycles or how long the application has been running. This is my favorite stimulus option because it is completely repeatable (basically by de nition) and allows
Figure 3.23 The asynchronous stimulus option allows you to set the values of input pins at arbitrary times.
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