GCBASIC / Discussion / Open Discussion: PIC16F1455 Hardware Serial to PC example.

Randall Young - 2015-05-13

Hi Folks,

I have the "Send_to_PC_Terminal_Example_via_TTL_Converter_HardwareUART" working perfectly with a PIC16F688, and a low cost CH340G USB2TLL converter, but with the PIC16F1455 at default clock setting I just get gibberish.

very simple config...

; ----- Configuration ;#chip 16F688, 4 ; WORKS! ;#config MCLRE = ON ;#chip 16F1455 ; DOES NOT...

Any ideas what I've done wrong?

Best,

Randy

Last edit: Randall Young 2016-05-15
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- Anobium - 2015-05-13
  
  @Randall. I am glad to here the demos are working for you. Nice to hear this. 😃
  
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Chuck Hellebuyck - 2015-05-13

You need to add the 4 for 4 MHz.

#chip 16F1455,4

Otherwise it will default to the internal oscillator default setting of 500KHz on the PIC16F1455 (per the data sheet).
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- Anobium - 2015-05-13
  
  @Chuck. Spot on answer. I will update the Help File to explain this a little more clearly.
  
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All,

Well a continuing oddity! 4 Mhz is the one setting that doesn't output and characters at all. I know the clock is pretty complicated on the chip to support auto-tuning from USB, I'm wondering if I'm missing a config bit setting.

Here's the slightly modified demo code:

; ----- Configuration
;#chip 16F688, 4
;#config MCLRE = ON
;exclamation is to suppress display large font on posting.
!#chip 16F1455, 4

; ----- Define Hardware settings
' THIS CONFIG OF THE SERIAL PORT TO A PC TERMINAL via a TTL Converter
' USART settings
#define USART_BAUD_RATE 9600
Dir PORTc.4 Out
Dir PORTc.3 In
#define USART_DELAY 5 ms
#define USART_BLOCKING

; ----- Variables
' No Variables specified in this example. All byte variables are defined upon use.

; ----- Main body of program commences here.
'Message after reset
wait 500 ms

HSerPrint "First Time!"
' "Carriage Return"
HSerSend 13
' "Line Feed"
HSerSend 10

wait 3 sec

do Forever
HSerPrint "Hello World, Randall Young"
' "Carriage Return"
HSerSend 13
' "Line Feed"
HSerSend 10
wait 2 sec
Loop

Last edit: Randall Young 2016-05-15

Randall Young - 2015-05-14

;Set up the assembler options (Chip type, clock source, other bits and pieces) LIST p=16F1455, r=DEC #include <P16F1455.inc> __CONFIG _CONFIG1, _MCLRE_OFF & _WDTE_OFF & _FOSC_INTOSC __CONFIG _CONFIG2, _LVP_OFF & _PLLEN_DISABLED & _CPUDIV_NOCLKDIV

What clock speed should this result in. No PLL (not 3X) no CPUDIV. HS clock source for FOSC_INTOSC?

Last edit: Randall Young 2016-03-22
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All,

The PIC16F1847 was more cooperative this morning. Running on a 18-pin PIC Demo LPC board.

; NOTE: remove all ! signs for cut and paste.

'''A demonstration program for GCGB and GCB.
'''--------------------------------------------------------------------------------------------------------------------------------
'''This program sends characters from microprocess using the GCB Hardware-UART methods via a TTL converter.
'''You have to add SCKP - Synchronous Clock Polarity Select bit acts differently depending on EUSART mode.
'''Asynchronous mode:
'''-1 - Transmit inverted data to the RC6/TX/CK pin; and
'''-0 - Transmit non-inverted data to the same pin.
'''@author  Evan R. Venn
'''@licence GPL
'''@version 1.0a
'''@date    31.01.2015
'''********************************************************************************

' ----- Alternate Configuration
'#chip 16F688, 4
'#config MCLRE = ON
'#chip 16F1455, 16

'----- Define Hardware settings

!#chip 16F1847, 4 
' THIS CONFIG OF THE SERIAL PORT TO A PC TERMINAL via a TTL Converter USART settings

#define USART_BAUD_RATE 9600

 Dir PORTB.2 Out
 Dir PORTB.1 In


#define USART_DELAY 5 ms
#define USART_BLOCKING

'Potentiometer on AN0, Part Number DM164120-4 - PICkit 18-Pin Demo Board
'set jumper 5, closed. Adjusting POT changes voltage reported by AN0

#define POT_PORT PORTA.0
#define POT_AN AN0


' ----- Variables
' No Variables specified in this example. All byte variables are defined upon use.

' ----- Main body of program commences here.
  'Message after reset
  wait 500 ms

  HSerPrint "One Time!"
   ' "Carriage Return"
   HSerSend 13
   ' "Line Feed"
   HSerSend 10

  wait 3 sec

  do Forever
   HSerPrint "Hello World, GCB & PIC16F1847"
   ' "Carriage Return"
   HSerSend 13
   ' "Line Feed"
   HSerSend 10
   wait 3 sec

   ;pump data out serial
   HSerPrint "Sensor Reading: "
   HSerPrint ReadAD10(POT_AN)
   HSerSend  13
   HSerSend  10

    wait 3 sec
  Loop

Last edit: Randall Young 2016-03-22

Randall Young - 2015-05-14

Here's a screen cap of it working...

Simple is good.

Success '1847 TX RB_2.JPG

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Anobium - 2015-05-14

Nice job. Any idea what 'fixed' the issue?

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Randall Young - 2015-05-15

A.,

No sir I do not, my thought is/was to get it working with some flavor of PIC or another then, then take a look at the ASM file, and see if I could determine as much as possible considering the subtle differences between the PICS themselves, what the problem is. So, I have it up on '1847 but not on the '1455...

I've had good luck on the PIC16FXXXX and Great Cow on a recent LCD project I need to post and share, the manifold and complex timing issues, just seem to work correctly on the mid-range extended products.

R.

Last edit: Randall Young 2015-05-15

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All,

Here's the source slightly adapted to work with PIC18F14k22, shows the true power of Great Cow to port across the PIC ecosystem, with just a few simple changes. Hosted on PICkit2 LPC demo board for test. Communicating to 2$ CH340G USB2TLL converter.

'' slight modification to host PIC18F14k22
'''@author Randall Young

Remove all !, used to deal with display issues.

; --- configuration

*#chip 18f14K22, 16 #config WDTEOFF , MCLREOFF , CPDOFF , BORENON, IESOOFF, FCMENOFF

!#config PLLENOFF , STVRENOFF , LVPOFF

 ; --- uart setup, TX Data out RB.7 via Black wire
!#define USARTBAUDRATE 57600

 Dir PORTB.7 Out
 Dir PORTB.5 In

!#define USARTDELAY 5 ms
!#define USARTBLOCKING

 'Potentiometer on AN0, Part Number DM164120-4 - PICkit 18-Pin Demo Board
 'set jumper 5, closed. Adjusting POT changes voltage reported by AN0

!#define POTPORT PORTA.0
!#define POTAN AN0


; ----- Variables
  ' No Variables specified in this example. All byte variables are defined upon use.

; ----- Main body of program commences here.
  'Message after reset
  wait 500 ms

  HSerPrint "One Time"
   ' "Carriage Return"
   HSerSend 13
   ' "Line Feed"
   HSerSend 10

  wait 3 sec

  do Forever
   HSerPrint "Hello World, GCB & PIC18F14k22"
   ' "Carriage Return"
   HSerSend 13
   ' "Line Feed"
   HSerSend 10
   wait 3 sec

   ;pump data out serial
   HSerPrint "Sensor Reading: "
   HSerPrint ReadAD10(POTAN)
   HSerSend  13
   HSerSend  10

    wait 3 sec
  Loop

Last edit: Randall Young 2016-03-22

WP_20150517_003(1).jpg

Anobium - 2015-05-17

Good job. May I edit and publish?

@Randall. I edited to add '~~~~ to your posting to correct the formatting errors. :-)

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PIC16F1455 Hardware Serial to PC example.

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PIC16F1455 Hardware Serial to PC example.