Hello,
I am new to MikroC, since now I've used CCS C compiler.
I have MikroProg, and Microchip Ethernet starter kit + starter kit I/O expansion board.
Pic32MX795F512L
Used pins: RD0, RD1, RD2 (leds)
Because I am new, I started with very simple code posted below:
FIRST:
void main() {
AD1PCFG = 0xFFFF;
TRISD = 0xFFF8;
PORTD = 0x0000;
while(1){
PORTD = 0x01;
Delay_ms(100);
PORTD = 0x02;
Delay_ms(100);
PORTD = 0x04;
Delay_ms(100);
}
}
SECOND:
void main() {
AD1PCFG = 0xFFFF;
TRISD = 0xFFF8;
PORTD = 0x0000;
while(1){
RD0_bit = 1;
RD1_bit = 0;
RD2_bit = 0;
Delay_ms(100);
RD0_bit = 0;
RD1_bit = 1;
RD2_bit = 0;
Delay_ms(100);
RD0_bit = 0;
RD1_bit = 0;
RD2_bit = 1;
Delay_ms(100);
}
}
When I use first code led blinking works as it should, but when I use second code where led blinking should be almost the same, it's not.
RD0 and RD2 are blinking correctly but RD1 is all the time off.
If I tray the second program in debug mode it works correctly.
What I am missing?
Thanks in advance!
Port bit manipulation
General discussion on mikroC PRO for PIC32.
Author
Message
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- Posts: 1
- Joined: 01 Sep 2011 11:44
Re: Port bit manipulation
#2 Post by filip » 19 Sep 2011 15:49
Hi,
This seems to be a Read/Modify/Write issue.
There is a difference when writing to the whole port (PORTD = 0x02) and when writing to the single pin (RD1_bit = 1).
In the second example, more steps are needed to be performed and this may cause this issue.
For writing to port, I suggest you using LAT register.
Also, it would be helpful if you can read about Read/Modify/Write problem in the Help file.
Regards,
Filip.
This seems to be a Read/Modify/Write issue.
There is a difference when writing to the whole port (PORTD = 0x02) and when writing to the single pin (RD1_bit = 1).
In the second example, more steps are needed to be performed and this may cause this issue.
For writing to port, I suggest you using LAT register.
Also, it would be helpful if you can read about Read/Modify/Write problem in the Help file.
Regards,
Filip.
Re: Port bit manipulation
#3 Post by basowsky » 29 Jan 2012 21:43
hi
i have notice the same problem; with pic18f26k22 i have solve the problem by setting to 0 the SLRCON (SLEW RATE CONTROL) register,
in this case the problem is similar???
thank you
i have notice the same problem; with pic18f26k22 i have solve the problem by setting to 0 the SLRCON (SLEW RATE CONTROL) register,
in this case the problem is similar???
thank you
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