PIC16F18854 Internal Oscillator .. Tx pin

[ashimotok0]

I am thinking of using a PIC16F18854 on my working PIC16F1827 project, in order to get increased I/O . I understand that the 16F18854 is supported by GCB but if I assemble my code, as that device selected it errors
"Warning: Configuration setting not valid: OSC = INTOSC"

Also I cannot find which pin is Tx for the UART ... I assume it must be RC6 CK but is there anything special I need to do in GCB to assign this as the TX pin ?

Is my choice of the 16F18854 a reasonable one .. I chose it as I am using the 5 bit DAC.

chip 16F18854, 4

#config Osc = intOSC

Best wishes .. Ash ... I have come on leaps and bounds using GCB over the last two weeks .. it truly is a remarkable programming tool for a newbie to get to grips with.

[Chris Roper]

You may find this useful.
https://sourceforge.net/p/gcbasic/discussion/projects&guides/thread/3fa399ca/

It introduces PPS and the PPSTool with a walkthrough of assigning SPI and USART on the 16f18855, yours is the same.

I see you are running at 4Mhz, just so you know you can run that device at 32Mhz.

Cheers
Chris

[Anobium]

You dont need to specify the internal oscillator source.

So, this works.

chip 16F18854, 4

As this now generators the correct ASM - where _RSTOSC_HFINT32 is the correct config.

#include <P16F18854.inc>
 __CONFIG _CONFIG1, _RSTOSC_HFINT32
 __CONFIG _CONFIG2, _MCLRE_OFF
 __CONFIG _CONFIG3, _WDTE_OFF
 __CONFIG _CONFIG4, _LVP_OFF

There any many, many demonstrations for the 16f18855 which is a sister chip. And, the serial demos will show you how to use PPS to setup the serial port.

Welcome the the world of PPS - but, the demos show you how PPS works. Use this URL https://github.com/Anobium/Great-Cow-BASIC-Demonstration-Sources/tree/master/Vendor%20Boards/Xpress%20Evaluation%20Board then search the page for serial. Demo #20 shows on line 67... 80.

'Set the PPS of the PWM and the RS232 ports.
'Set the PPS for this solution.
#startup InitPPS, 85

Sub InitPPS
UNLOCKPPS
    RC0PPS = 0x0010       'RC0->EUSART:TX;
    RXPPS  = 0x0011       'RC1->EUSART:RX;

    RC3PPS = 0x0017       'RC3->MSSP2:SDA2;
    SSP2DATPPS = 0x0013   'RC3->MSSP2:SDA2;
    SSP2CLKPPS = 0x0014   'RC4->MSSP2:SCL2;
    RC4PPS = 0x0016       'RC4->MSSP2:SCL2;
  LOCKPPS
End sub

#define USART_BAUD_RATE 19200
#define USART_TX_BLOCKING

The shown above can be generated using the PPSTool - it is fun to use. In the example about the PPS has setup RC0 and RC1 as TX and RX respectively. When you use PPSTool you can select from lots of ports. :-)

Anobium

[ashimotok0]

Thanks for the prompt replies everyone .. I see it all cleraly now. That PPS tool looks awesome :)

Ash