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The following codes are for initializing the LCD display and directly copied from my program, but when those codes under debugging using software simulator, why the line 6 & line 12 always are non-executable code (invalid break points)? What are the possible reasons? void DispInit ( unsigned char maxrows, unsigned char maxcols) { 1. DispInitPort(); 2. DispMaxRows = maxrows; 3. DispMaxCols = maxcols; 4. OS_Delay(100); 5. DispSel(DISP_SEL_CMD_REG); 6. DispDataWr(0x30); 7. OS_Delay (2); 8. DispSel(DISP_SEL_CMD_REG); 9. DispDataWr(0x30); 10. OS_Delay(150); 11. DispSel(DISP_SEL_CMD_REG); 12. DispDataWr(0x30); 13. OS_Delay(2); 14. DispSel(DISP_SEL_CMD_REG); 15. DispDataWr(0x08); 16. OS_Delay(2); 17. DispSel(DISP_SEL_CMD_REG); 18. DispDataWr(0x08); 19. OS_Delay(2); } Please help me, it is time consuming & really killing
I've never used LCDs so this may be dumb question. Is DispDataWr() an actual function call or a macro that writes data to a variable? If it is a macro you might be able to fix the problem by declaring the variable as volatile so it is not obtimized out. -Walt
Thank you for your responds. The following codes is the DispDataWr() function: static void DispDataWr(unsigned char val) { P21_PIN = 0; // write operation P22_PIN = 1; // give operation start signal _nop_ (); _nop_ (); // wait P1 = val; // write value P22_PIN = 0; P1 = 0xff; // DATA_PORT is input [prevent I/O-Port from demage] } and the OS_Delay function is the following codes: void OS_Delay ( int n ) { int i; while( n --) { for(i == 0; i < 125; i++ ) {;} } }