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Great! I'll have to see if my 30 days of compiler updates is still valid or order an update package.

Thanks!

Wow, that has to be it. I will correct my code to handle this problem. I appreciate your help, you have saved me alot of time and made me aware of this Read-Modify-Write problem.

Should I send CC ...

In my diagram the source of the fet is grounded and the drain connects to the cathode of the led.

I have changed my enable_led() function to accomodate this problem and everything is working smoothly.

void enable_led( int value, int time_ms, int number )
{
int i, j = 0;
...

It looks like it is the read-modify-write problem you have previously mentioned. I was able to turn all the LED's on.

I have a question though, even if I put a 500ms delay in between successive bi ...

Alright I will try that. If it is a read-modify-write problem, wouldn't a 500ms delay between port reads be enouph to allow that pin to settle to the correct value? The only load on that pin is the ...

I tried the delay and it acts the same, the two leds connected to A3 and A4 blink for a very belief moment while all the other leds come on.

I am lost...

I have the following circuit, one for each of the following pins: A0, A1, A2, A3, A4, A5, C1 (7 total LEDs).

I also have pin C2 used for to turn on the 5V supply for all of the LED's.

...

I have attached the following LEDs, resistors and transistors to the following pins: A0, A1, A2, A3, A4, A5, C1 (all wired the same).

I have a power enable for the power source to the leds, which i ...

Its seems like I have no problem turning them on individually, but when I turn all of the leds on two of them only pulse and won't come on.

I believe that when I turn one of the ports on (either A4 ...

I have tried your main for both pins A3 and A4 and they work! Both output_high(PIN_A3) and output_bit(PIN_A3, 1) work.

Let me look more into my function call enable_led() to see where things get m ...

Thanks for the quick response.

I reviewed the data sheet and all I find is that RA4 is TTL Input type, CMOS output type, and General Purpose I/O, without saying anything about the Open Drain only. ...

Hello,

I am using a PIC16LF722 for a project and I am have difficulty with two pins RA3 and RA4.

When I may the call output_bit(PIN_A3, 1) or output_bit(PIN_A4, 1) they turn on for about 1 ms, ...

Ttelmah,

Thanks for the correction. I won't have much overhead between reads from SPI and writes to UART. I'll start working on it.

Thanks again!

-Chris

Hello,

I have an SPI signal coming to my PIC with at above 8kHz. Will a PIC18F14K22 be able to read this and pass it out the UART in time? This is with a 16MHz external clock with a 4x PLL.

1 ...