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Hence, typecasting helps to determine the values in complex variables and structures that are not readily available. It’s possible while debugging a function, to use CCS’s typecast feature to expose the values of a structure or variable if you only have the pointer address. The term watch window is used till CCSv4 and all the updated versions call it expression window. This window displays and expands arrays, structures, and pointers. You can use a watch window or expression window to view and modify variables and expressions. Image 1.2 Typecasting variables in watch/expression window Image 1.2 shows the register value in B15 as the stack pointer (SP) in a stack and the address that it points to.
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In such scenarios, the stack pointer is fetched from the register and verified by checking each possible next function in the stack trace, getting the code flow, and the module names.Īs there are asynchronously executed tasks or functions in the stack trace, you can identify the bugs by cross-checking the addresses shown there. It may prompt the call stack to provide the wrong information. Or, the debugger may lose the return address of the original function if a call goes to an invalid or incorrect address location. Many a time it is difficult to trace the function by just looking at the call stack window.įor example, when a program comes across a function pointer, sometimes, it cannot get the direct function flow. Image 1.1 shows all core register values. Same way, other registers give information about the last executable function, loop counter, frame pointer, and program fetch pointer. If you know that register B15 holds the stack pointer address, you can check the value on this address in the stack memory. Suppose you have stored the stack pointer in register B15. These registers can hold the data, data address pointers, or core registers.Įach register holds values that you can check when you debug a problem in a code. General purpose register valuesĬode Composer Studio provides information on general-purpose register values.
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This feature is available till CCSv3 but you can get it in the above versions by keeping the target running when a breakpoint is set, and the breakpoint property is set up to update all windows. When you need to debug any feature, you can change the variable that controls it from the watch window and observe the output buffer as the values update according to that feature.
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It automatically resumes execution of the target application till it reaches a breakpoint and continues the process till it stops through manual intervention.Īnimation is useful in examining input buffers, output buffers, and any other kind of data that the program processes. This way, you can analyze the values getting updated in the window when the target application halts. You can use animation the same way as the run command with the difference that it continues execution even after hitting the breakpoints. It doesn’t matter if the program runs on RAM or ROM.
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You can use the software breakpoints in the volatile memory and the hardware breakpoints in the targeted memory location. On the other hand, you use a hardware breakpoint to stop a processor. If a data variable address is written with different data values multiple times in a program, you can use a hardware watchpoint to locate the desired place in a code. This access could be from the processor or DMA (Direct Memory Access) to a targeted memory location. Points to follow for Efficient Debugging Keeping Hardware Watchpoint or Hardware Breakpointĭebugging a program involves using a hardware watchpoint to halt the execution of a program just before a write or read access to a data variable address.