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LDmicro Forum - Wrong Logic generated for PIC16f877A Microcontroller by LDmicro |
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Wrong Logic generated for PIC16f877A Microcontroller by LDmicro (by USMAN ALI BUTT(Pakistan))
Hi Jonathan Westhues!
I just made a simple logic in LDmicro. Its when ever Port-C Pin#0 is high. Then portB Pin#7 should accutated.. Push button is attached to port-c pin0 and output is at port-b pin7... When i run the simulation it is ok..... But when i download it in pic16f8777a microcontroller. It blinks the output led. I haven't pressed any button etc nor did i do any thing just downloaded the IHEX file in microcontroller, power it and it starts blinking. I cant figure it out whats the problem is... When i change the cycle time led starts blinking faster etc.... Can you figure it out... I write the same logic in c++ language, generated IHEX and downloaded it in microcontroller and its working fine.... I attacted both files.....
Wrong Logic generated for PIC16f877A Microcontroller by LDmicro (by USMAN ALI BUTT(Pakistan))
Heres c++ code which is working fine...
(no subject) (by MGP)
_____Port-C Pin#0 is high. Then portB Pin#7_____
I think you are confused RC0 = pin 15 RB7 = pin 40 And use a pullup resistor at the input and disconnect your programmer because RB7 is used for programming the chip.
(no subject) (by USMAN ALI BUTT(Pakistan))
MGP did you looked at my testing PLC.ld file... Is it ok? I think its ok.. But the IHEX file it generates is not working properly... Heres the IHEX file....
(no subject) (by Boris)
Look the size of this program and pic is 94% full and everything is working correctly.
Check programer and hardware.
(no subject) (by USMAN ALI BUTT(Pakistan))
One thing more i noticed that LDmicro is treating RA1 pin-3 of pic16f877a as RA0 pin-2 .... I think its a bug.....
But my question is still their.... Why pic16f877a is working by its own blinking etc.... I am not giving any input... I made ladder that if push button is pressed than their should be output(coil energized)... Please help me i have to show it working condition to my teachers..... Well Boris if i write logic in c++ and made IHEX its working fine... But LD-Micro IHEX is not working fine...
(no subject) (by MGP)
Can we see your schematic?
(no subject) (by USMAN ALI BUTT(Pakistan))
Yes why not its working fine when IHEX file is generated by writting C++ code in MPLAB-IDE by microchip......
(no subject) (by MGP)
Most of your problems are caused by your printed circuit board.
-No decoupling capacitors. -Floating controller inputs, no GND when the opto is not conducting. (see the 2 ways in the attached file) -+V and GND lines are to small and too long. It's not the software, but the oscillating hardware. Make your circuit on a breadboard with 1 input and 1 output, so you can test your software.
(no subject) (by David R)
Ldmicro NEVER makes incorrect code!
(no subject) (by USMAN ALI BUTT(Pakistan))
Thanks MGP
Previously i didn't pay mush attention on PULL down resistors.. Now when i put pull down resistors, circuit is working properly... Once again thanks.....
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