SEROUT Just Garbage!

[geckogrotto]

geckogrotto,

I'm actually trying to understand a little bit more about serial communication and making some tests on my side too.

I had to use a level converter (MAX232) to make the communication work.

Looking at some posts, I have understand you connected your PIC directly to the PC's serial port (= without converter)?

I must be wrong, no?

Nope not wrong. I have pic output GPIO.0 connected to a 1K resistor then to serial pin 2 and GPIO.1 directly to serial pin 3. Serial pin 5 to ground.
Also have a 0.1uF from pin 1 to 8 of the PIC + and ground. Thats it using the last bit of code Mister_e posted and its working fine.

I should already be in bed now, I'm crashing now but if I can help I will tomorrow.

[flotulopex]

Ah!? (which means I'm very surprised!!!)

I thought it was mandatory to use a level converter to transmit data from a PIC to a PC and vice-versa.

I will try to connect my 12F675 as you did.

In fact, my first try was with a 16F88 having an AUSART module and it didn't worked whithout the level converter (but I didn't use a resistor neither - I'll have to try this too). Data where transferred but it was unreadable - fuzzy characters and RX counter on PC never stopped. Is this (module) making a difference?

Get "regenerated" first...

Thanks

[geckogrotto]

Ah!? (which means I'm very surprised!!!)

I thought it was mandatory to use a level converter to transmit data from a PIC to a PC and vice-versa.

I will try to connect my 12F675 as you did.

In fact, my first try was with a 16F88 having an AUSART module and it didn't worked whithout the level converter (but I didn't use a resistor neither - I'll have to try this too). Data where transferred but it was unreadable - fuzzy characters and RX counter on PC never stopped. Is this (module) making a difference?

Get "regenerated" first...

Thanks

Let me know how it goes. I was getting weird chars at first but turned out my OSCAL was messed up. I believe you have to have
DEFINE OSCCAL_1K 1
ANSEL = 0 'disable ADCs
CMCON = 7 'disable comparator
in there for sure too.

[flotulopex]

OSCCAL is not valid for 16F88.

Even with ANSEL and CMCON set, I still get strange characters on the terminal's screen.

When I connect to my level converter, no problem.

I'm goint to try with my 12F675...

[Charles Linquis]

Since the level converter provides inversion, and it works with the level converter, it follows that if you are not using a level converter, you need to send the data inverted.

[flotulopex]

I just can't find the setting to "invert" data on Hyperterminal for Windows XP. Same for the Terminal emulator within Micro Code Studio.

Since I'm always getting these same bizarre characters, it might effectively be because of this missing signal invertion.

Can someone suggest any terminal emulator I could use?

[SteveB]

Can someone suggest any terminal emulator I could use?

I use Tera Term. I find it much easier to use than hyperterminal. But, and I am speaking in the blind a little hear, I don't know if you can invert the singnals from the terminal software. Either way, you may find you like Tera Term, and it's FREE!

Steve