Serial Baudrate 115200

[kblim]

Hi all,
I was previously using the SerOut2 to send data, but the data line was sharing by few PICs and I have used Open Mode.
Recently porting my code by replacing SerOut2 with the Debug command to save same space. But later found out that there are no way to setup the Debug in the open mode.
Please help! Is there neccessary to use Open mode to share the data? or the Debug doesn't need the Open mode even sharing the data line.

Regards

[dhouston]

I have an application where a PIC12F683 has to communicate with an external peripheral. I need SerIn/SerOut because the external device may be 4800 or 9600 bps.

The PIC12F683 also needs to communicate with a PIC16F876A.

Is there any advantage to using Debug/DebugIn for the PIC2PIC comms given that the PIC12F683 already uses SerIn/SerOut?

[Dave]

dhouston, Serin/out provide software type communications and can have the baudrate's and port's changed on the fly during program execution. Therefore the compiled code overhead is quite large, whereas Debigin/out commands after the compile are the smallest for software type usart emulation. The port and baudrate used for Debugin/out can not be changed during program execution therefor they must be DEFINE'd at the start of the source program. There are some other functions that are lost in the use of Debugin/out but for the most part it was designed for program debugging with a terminal. I have used Debugout for PIC micros that have no internal usart and still use it today for programming debug functions. The limitations of Debugin/out are covered in the manual. LOL

Dave Purola,
N8NTA

[dhouston]

Dave,

I understand all of that.

My question is, given that I have to use SerIn/SerOut for the external link, will I take another overhead hit if I also use it for the internal link or can I gain by using Debug for the internal link?

[Dave]

dhouston , If you are already using Serin/out on your program there is no need to add the extra code overhead in using Debugin/out unless you need the serial speed.

Dave Purola,
N8NTA

[flotulopex]

I'm having difficulties making my PIC's HSEROUT working at all. I need to get 115200bps.

I can reach 38400bps with the SEROUT2 command without any trouble.

For 115200bps, I go with HSEROUT. I use the MCS Serial Communicator and the PIC has a 20MHz crystal.

SEROUT2 is okay, HSEROUT is not working at all (not even @1200bps).

I've been trying to make it work for hours and hours, redoing the cabling (see picture) different ways as suggested in other threads, modifying the code also many times but no success until now. I just always get garbage on the serial terminal's screen.

' SEROUT2
  
' PIC 16F690 Fuses
@ __Config _FCMEN_OFF &_IESO_OFF &_BOR_OFF &_CPD_OFF &_CP_OFF &_MCLRE_OFF &_PWRTE_OFF &_WDT_OFF &_HS_OSC
 
OPTION_REG = 000000 'PORT A&B Pull-Ups (look WPUA & WPUB)
ADCON0     = 000000 'A/D Module
ANSEL      = 000000 'Select analog inputs Channels 0 to 7
ANSELH     = 000000 'Select analog inputs Channels 8 to 11
INTCON     = 000000 'INTERRUPT Control
'WPUA       = 000000 'Select PORTA weak pull-ups
'IOCA       = 000000 'Interrupt On Change selection
CM1CON0    = 000000 'Comparator1 Module
CM2CON0    = 000000 'Comparator2 Module
TRISA      = 000000 'Set Input/Output (0 to 5)
PORTA      = 000000 'Ports High/Low (0 to 5)
TRISB      = 000000 'Set Input/Output (4 to 7)
PORTB      = 000000 'Ports High/Low (4 to 7)
TRISC      = 000000 'Set Input/Output (0 to 7)
PORTC      = 000000 'Ports High/Low (0 to 7)
 
'-------------------------------------------------------------------------------
' DEFINEs
DEFINE OSC 20
DEFINE LCD_COMMANDUS 2000
DEFINE LCD_DATAUS 50
 
'-------------------------------------------------------------------------------
LED1    VAR PORTA.2
Counter VAR WORD
Counter = 0
 
TEST:
  TOGGLE LED1
  'serout2 PORTB.7,16416,[dec counter,13,10]'19200 DIN with MAX232
  SEROUT2 PORTB.7,16390,[DEC Counter,13,10]'38400 DIN with MAX232
  PAUSE 500
  Counter = Counter + 1
  GOTO TEST
  
  END

' HSEROUT
  
' PIC 16F690 Fuses
@ __Config _FCMEN_OFF &_IESO_OFF &_BOR_OFF &_CPD_OFF &_CP_OFF &_MCLRE_OFF &_PWRTE_OFF &_WDT_OFF &_HS_OSC
 
OPTION_REG = 000000 'PORT A&B Pull-Ups (look WPUA & WPUB)
ADCON0     = 000000 'A/D Module
ANSEL      = 000000 'Select analog inputs Channels 0 to 7
ANSELH     = 000000 'Select analog inputs Channels 8 to 11
INTCON     = 000000 'INTERRUPT Control
'WPUA       = 000000 'Select PORTA weak pull-ups
'IOCA       = 000000 'Interrupt On Change selection
CM1CON0    = 000000 'Comparator1 Module
CM2CON0    = 000000 'Comparator2 Module
TRISA      = 000000 'Set Input/Output (0 to 5)
PORTA      = 000000 'Ports High/Low (0 to 5)
TRISB      = 000000 'Set Input/Output (4 to 7)
PORTB      = 000000 'Ports High/Low (4 to 7)
TRISC      = 000000 'Set Input/Output (0 to 7)
PORTC      = 000000 'Ports High/Low (0 to 7)
 
'-------------------------------------------------------------------------------
' DEFINEs
DEFINE OSC 20
DEFINE HSER_RCSTA 90h
DEFINE HSER_TXSTA 24h
DEFINE HSER_BAUD 19200
'DEFINE HSER_SPBRG 64
DEFINE HSER_CLOERR 1
 
'-------------------------------------------------------------------------------
LED1    VAR PORTA.2
Counter VAR WORD
Counter = 0
 
TEST:
  TOGGLE LED1
  HSEROUT [DEC Counter,13,10]
  PAUSE 500
  Counter = Counter + 1
  GOTO TEST
  
  END  

There's a MAX232 close to the PIC making me think the lines are as short as possible. But is it enough on the hw side?

[Charles Linquis]

Try changing

DEFINE HSER_TXSTA 24h to

DEFINE HSER_TXSTA 20h