Some doubts regarding PCM 3.169 USART Bug ??

arunb · Joined: 08 Sep 2003 Posts: 492 Location: India

Hi,

MCU: 16F648A
PCM ver.: 3.169

I am aware that the PCM 3.169 compiler has a bug, when used with 16F648A, the USART functions like getc, putc etc. do not work, I have implemented the workaround for this (posted by PCM Programmer ina earlier post).

Now I am using RS 485 instead of RS 232, does the workaround need any changes (in RS 485 an enable pin is used, in my case it is pin_b5).

Kindly advise..

thanks
arunb

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

When you refer to some posted code, you should provide a link to it:
http://www.ccsinfo.com/forum/viewtopic.php?t=26631&start=8

arunb · Joined: 08 Sep 2003 Posts: 492 Location: India

Thanks for the tip...

Will the code work for RS 485 as well...

arunb

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

No it won't. RS-485 uses an enable pin for the transmit driver.

You need to create a routine similar to the one shown in this post:
http://www.ccsinfo.com/forum/viewtopic.php?t=14445&highlight=trmt

arunb · Joined: 08 Sep 2003 Posts: 492 Location: India

Hi,

I just noticed a problem in the receive routine using interrupt (INT_RDA).

While sending a stream of characters from the PC the PIC does not receive them correctly... but if the stream is slowed down , then the PIC receives the data correctly, is there any way to speed up the receive process. In the built-in getc function I didi not have this problem....

thanks
arunb