Is the serial object limited to 19k2

John_B

Hi,
I've been using the full serial object without a problem up to 19k2 for some time, but trying to use it above that and input char's are sometimes missed. Transmitted char's are fine.
What is the max reliable baud rate for this object?
I'm running at 16Mhz.
Thanks
Jon

StefanL38

Hello John,

Do you mean the FullDuplexSerial-object or the simple-serial-object ?

you wrote that you are running at 16 MHz. This is very uncommon. Most common is chrystal frequency 5 MHz and a PLL-factor of 16 = 80MHz
Some boards have a 10MHz chystal and a PLL-facor of 8 to reach 80 MHz

So wich propeller-board are you using ?

How does your setup for the frequency-constants in the SPIN-code look like ?

example of what is most common 5 MHz and PLL-factor 16

CON
  _clkmode        = xtal1 + pll16x
  _xinfreq        = 5_000_000

some boards have 10 MHz and PLL-factor 8

CON
  _clkmode        = xtal1 + pll8x
  _xinfreq        = 10_000_000

best thing to do is if you use the Post reply-button
create a ZIP-archive with your complete code by clicking File - Archive - Project ....
and attach this ZIP-file to a posting

best regards

Stefan

photomankc

Off the cuff I'm guessing you'd have more success at higher clock rates.

Cluso99

I use FDX at 115200 all the time - but no RS232 chips involved - just to the FTDI chip which converts to USB. I know a lot of others do this too.
Dracula is using 38400 and RS232 using MAX chips.

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Mike Green

The FullDuplexSerial object will work well over 115200 Baud with an 80MHz system clock (5Mhz crystal + x16 PLL).· Assume that·maximum Baud will be roughly proportional to the system clock speed, so a system clock speed of 16MHz should work for Bauds slightly in excess of 19200 Baud.