hi:
As shown in the figure，There are two program debug diagrams(wrong version and Correct version). The two versions of the program are similar,the only difference is at F red box. The wrong version is the first figure,The correct version is the second figure. The error appears at C ( D) red box.(C red box is expressed by assembly, D red box is expressed in C language;the two are the same. )
The location of the error is the value of the global variable USART2_RX_STA ,in the first figure. The value of the global variable is stored in the address that R29 points to ,in the first figure.The address (R29 000020E4)that R29 points to is in the Code flash memory region in the first figure; It is error. The address (R30 40001348)that R30 points to is in the SRAM region in the second figure; It is correct.
The only difference between the two programs is at F, Why does the error version of the program go wrong ? Why is the value of a global variable stored USART2_RX_STA in the Code flash memory region ? The actual value is error and fixed. But The values you see through the debug window are correct (E red box).(The code is attached, software version: CodeWarrior IDE 2.10)
thank you
