Hi,
I am using the AT89C5131A MCU. I have an issue related to the HEX code generated by keil. Actually I was testing the output level(1 or 0) from each 4 ports using a simple HEX code.
IF I write an assembly code and generate its equivalent HEX code ( purpose - as stated above) and burn it to MCU then it works as expected. But if I write same logic in keil(C program) then use the HEX code generated by it and burn it to MCU then is also works as expected for PORT 1 and PORT 3 only. There are some fluctuations in PORT 0 and PORT 2 if I use the HEX code generated by Keil(c program) but with the Assembly's HEX code, all ports works fine. I have checked all settings in Keil, all are correct.
Could anyone please tell me the solution for same.
Thanks in advance! Mohit
What then send the code you wrote? It's hard to advise when not disclose how your program looks
Hi Sheldoniq,
There is nothing in the code that I can't disclose. Its a simple LED blinking code. There you go -
//code #include<AT89C5131.h>
void delay(unsigned int); void main(void) { P0_0=0; P0_1=0; P0_2=0; P0_3=0; P0_4=0; P0_5=0; P0_6=0; P0_7=0; delay(500); P0_0=1; P0_1=1; P0_2=1; P0_3=1; P0_4=1; P0_5=1; P0_6=1; P0_7=1; delay(500); } void delay(unsigned int itime) { int i,j; for(i=0;i<itime;i++); for(j=0;j<5000;j++); }
If I burn this code then there are some flaws in Ports P0 and P2 but if I write similar logic in Assembly language then all ports works fine. One more thing, the code shown above is for Port P0, if I write same thing for any other port even then this problem persists. If you need Assembly code or any other info please let me know.
Thanks!