Hi All,
I am having difficulties getting a 1Hz pulse from the output of the RTCC module on a PIC18F26J50.
I have a 32.768kHz signal being fed directly to the T1CKI input from my signal generator to act as the clock source.
I have a 2Hz signal being generated via the main program look and fed to RB2 to show that the program is alive and running.
RB2 feeds to an LED via a suitable current resistor to ground - this works perfectly and the LED flashes as expected.
I have the same LED/current resistor connected from the RTCC output (RB1) to ground - this this pin is always low!
My program is as follows:
I know the TIMER1 settings are correct and the clock source is operational because I have proven operation using a separate program with DT_INTS-18 and a flashing LED ISR routine.
This only leaves the RTCC register setting which have been copied directly from a previous RTCC post http://www.picbasic.co.uk/forum/show...highlight=RTCC
I have spent days trying to work out what I have done wrong - alas, all to no avail :(
Any assistance to help resolve this problem would be greatly appreciated.
Cheers
Barry
VK2XBP
I am having difficulties getting a 1Hz pulse from the output of the RTCC module on a PIC18F26J50.
I have a 32.768kHz signal being fed directly to the T1CKI input from my signal generator to act as the clock source.
I have a 2Hz signal being generated via the main program look and fed to RB2 to show that the program is alive and running.
RB2 feeds to an LED via a suitable current resistor to ground - this works perfectly and the LED flashes as expected.
I have the same LED/current resistor connected from the RTCC output (RB1) to ground - this this pin is always low!
My program is as follows:
Code:
'***********************************************************************
'* Name : RTCC_18F26J50_Test.pbp *
'* Author : Barry Phillips *
'* Notice : Copyright (c) 2017 Baztronics *
'* : All Rights Reserved *
'* Date : 12/09/2017 *
'* Version : 1.0 *
'* Notes : Program to generate a 1Hz output on RB1 (pin 22) using *
'* : RTCC module on PIC18F26J50. A 32.768kHz signal is fed to *
'* : the T1CKI (pin 11) to drive the RTCC. A 2Hz signal is *
'* : generated in the main program loop and output on RB2 *
'* : (Pin 23) to indicate the program is alive and running. *
'***********************************************************************
;----[Device Configuration]-----------------------------------------------------
#CONFIG
CONFIG WDTEN = OFF ; Disabled
CONFIG PLLDIV = 1 ; Divide by 1 (4 MHz oscillator input)
CONFIG STVREN = OFF ; Disabled
CONFIG XINST = OFF ; Disabled
CONFIG DEBUG = OFF ; Disabled
CONFIG CPUDIV = OSC1 ; No CPU system clock divide
CONFIG CP0 = OFF ; Program memory is not code-protected
CONFIG OSC = INTOSC ; Internal Oscillator
CONFIG T1DIG = OFF ; Secondary Oscillator clock source may be not selected
CONFIG LPT1OSC = OFF ; High-power operation
CONFIG FCMEN = OFF ; Disabled
CONFIG IESO = OFF ; Disabled
CONFIG WDTPS = 512 ; 1:512
CONFIG DSWDTOSC = INTOSCREF ; DSWDT uses INTRC
CONFIG RTCOSC = T1OSCREF ; RTCC uses T1OSC/T1CKI
CONFIG DSBOREN = OFF ; Disabled
CONFIG DSWDTEN = OFF ; Disabled
CONFIG DSWDTPS = G2 ; 1:2,147,483,648 (25.7 days)
CONFIG IOL1WAY = OFF ; The IOLOCK bit (PPSCON<0>) can be set and cleared as needed
CONFIG MSSP7B_EN = MSK7 ; 7 Bit address masking mode
CONFIG WPFP = PAGE_0 ; Write Protect Program Flash Page 0
CONFIG WPEND = PAGE_WPFP ; Page WPFP<5:0> through Configuration Words erase/write protected
CONFIG WPCFG = OFF ; Configuration Words page not erase/write-protected
CONFIG WPDIS = OFF ; WPFP<5:0>/WPEND region ignored
#ENDCONFIG
;----[DEFINEs]------------------------------------------------------------------
DEFINE OSC 4
;----[Aliases]------------------------------------------------------------------
;----[Variables]----------------------------------------------------------------
;----[Initialize]---------------------------------------------------------------
OSCCON = %01101100 ;4MHz Oscillator
ANCON0 = %11111111 ;All pins configured as a digital I/O
ANCON1 = %00011111 ;Band gap turned off
;All other pins configured as a digital I/O
T1GCON.7 = 0 ;Timer1 gate disabled
TCLKCON.4 = 1 ;Device is clocked by T1OSC/T1CKI
T1CON = %10000101 ;T1CKI Input
;1:1 prescale
;no sync
;8-bit
;Timer1 on
TRISB = 0 ;All PORTB as digital output
PADCFG1 = %00000010 ;RTTC Seconds clock output on the RTCC pin
RTCCFG.2 = 1 ;Enable RTCC output
EECON2 = $55 ;unlock sequence to enable writes to RTCC registers
EECON2 = $AA
RTCCFG.5 = 1 ;Enable RTCC write
RTCCFG.7 = 1 ;Enable RTCC module
EECON2 = $55 ;lock sequence to disable writes to RTCC registers
EECON2 = $AA
RTCCFG.5 = 0 ;Disable RTCC write
;----[Main Program Loop]--------------------------------------------------------
Main:
PORTB.2 = 1
PAUSE 250
PORTB.2 = 0
PAUSE 250
GOTO Main
ENDI know the TIMER1 settings are correct and the clock source is operational because I have proven operation using a separate program with DT_INTS-18 and a flashing LED ISR routine.
This only leaves the RTCC register setting which have been copied directly from a previous RTCC post http://www.picbasic.co.uk/forum/show...highlight=RTCC
I have spent days trying to work out what I have done wrong - alas, all to no avail :(
Any assistance to help resolve this problem would be greatly appreciated.
Cheers
Barry
VK2XBP