Hi Folks,
First time use of subject PIC chosen for its inbuilt 8bit DAC. Code below runs but throws compile errors with:
1 onboard eeprom (I'd really like to get this working).
2 can't use binary to set FVRCON (decimal works fine). This isn't a big deal but why the error and what does it mean?
Am I missing something obvious? I've RTFM but still scratching my head...
Thanks,
Bill
First time use of subject PIC chosen for its inbuilt 8bit DAC. Code below runs but throws compile errors with:
1 onboard eeprom (I'd really like to get this working).
2 can't use binary to set FVRCON (decimal works fine). This isn't a big deal but why the error and what does it mean?
Am I missing something obvious? I've RTFM but still scratching my head...
Thanks,
Bill
Code:
'*********************************************************************************
'* Name : DACtest.pbp *
'* Date : 16/07/20 *
'* Device : 16F1705 *
'* Version : 1 (PBP 3.0.10.4) *
'*********************************************************************************
'
'=========================================================================================================
' CONFIGURE DEVICE
'=========================================================================================================
#CONFIG ; 16F1705
__config _CONFIG1, _FOSC_INTOSC & _WDTE_ON & _PWRTE_ON & _MCLRE_ON & _CP_OFF & _BOREN_ON & _CLKOUTEN_OFF
__config _CONFIG2, _WRT_OFF & _PPS1WAY_OFF & _ZCDDIS_OFF & _PLLEN_OFF & _STVREN_ON & _BORV_LO & _LPBOR_OFF & _LVP_OFF
#ENDCONFIG
' Connections as follows:
' ****16F1705 PIC**** Comments
'
' Vdd (pin 1) 5 volts.
' RA5 (pin 2) T1clk. Spare.
' RA4 (pin 3) AN3, T1G. Spare.
' MCLR RA3 (pin 4) IOC. Pull High 10k. Spare.
' RC5 (pin 5) Opamp2in+, CCP1. Spare.
' RC4 (pin 6) Opamp2in-. Serout for monitoring (9600).
' RC3 (pin 7) AN7, Opamp2Out, CCP2. Serin for setting from laptop (9600).
' RC2 (pin 8) AN6, Opamp1Out. Spare.
' RC1 (pin 9) AN5, Opamp1in-. Spare.
' RC0 (pin 10) AN4, Opamp1in+. Spare.
' RA2 (pin 11) AN2, DAC1out2. Initial use with pot to adjust DAC output.
' ICSPclk RA1 (pin 12) AN1, Vref+. Spare.
' ICSPdat RA0 (pin 13) AN0, DAC1out1. Output voltage from DAC.
' Vss Ground (pin 14)
'=========================================================================================================
' PIN ASSIGNMENTS, SYSTEM CONSTANTS, TEMPORARY VARIABLES
'=========================================================================================================
' Alias pins
DAC1out var PortA.0 ' Output voltage from DAC via 1k.
Iset var PortA.2 ' Pot to adjust DAC output.
in_pin var PortC.3 ' serial in via 22k.
out_pin var PortC.4 ' serial out via 1k.
'=========================================================================================================
' Variables
'=========================================================================================================
pott var word ' 10bit value from pot.
Message var byte '
a var byte ' Loop counter.
'=========================================================================================================
' Constants
'=========================================================================================================
B96 CON 16468 ' Baudmode for 9600,8,N,1 inverted.
' -----[ Initialization ]----------------------------------------------------------------
' Stored onboard E2...
'#### Message below brings:
'[ERROR] dactest.pbp (58) : Syntax error
'[MESSAGE] pic16f1705.pbpinc(351): HPWM command only supports CCP channels (not PWM channels).
'Message Data "DACtest 16Jul20"
' Clear ' Reset all variables.
INCLUDE "modedefs.bas" ' Include serial modes.
DEFINE DEBUG_REG PORTC ' Debug pin port.
DEFINE DEBUG_BIT 4 ' Debug pin.
DEFINE DEBUG_BAUD 9600 ' Debug baud rate
DEFINE DEBUG_MODE 1 ' Debug mode: 0 = True, 1 = Inverted
' DEFINE DEBUG_PACING 1000 ' Debug character pacing in us
DEFINE DEBUGIN_BIT 3 ' Input pin.
DEFINE OSC 4 ' Adjust to suit design.
OSCCON = %01101011 ' Internal 4MHz osc.
' OSCCON = %01110011 ' Internal 8MHz osc.
' OSCCON = %01111011 ' Internal 16MHz osc.
' OSCCON = %11110011 ' Internal 32MHz osc PLL.
OPTION_REG.7 = 1 ' Disable weak pullups.
' OPTION_REG.7 = 0 ' Enable weak pullups.
DEFINE ADC_BITS 10 ' Set number of bits in result.
DEFINE ADC_CLOCK 3 ' Set clock source (rc = 3).
DEFINE ADC_SAMPLEUS 50 ' Set sampling time in microseconds.
' ADCON0 = 0 ' No ADC.
ADCON0 = %00000001 ' Enable ADC.
ADCON1 = %10000000 ' Right justify, Frc, use Vdd for Vref.
ADCON2 = %00000000 ' No Trigger selects.
ANSELA = %00000100 ' AN2 the rest Dig.
' ANSELA = 0 ' Disable ADC.
ANSELC = %00000000 ' All Dig.
CM1CON0 = 0 ' Comparators off.
' #### These Error if uncommented:
' FVRCON = $0 ' Disabled.
' FVRCON = $11000101 ' Enabled, Vref 1.024V, DAC1out1 (RA0).
' DAC1CON0 = $10101000 ' Vref from FVR.
' DAC1CON1 = $10000000 ' Set initial output value to 50% of Vref.
'[WARNING] dactest.pbp (100) : $11000101 Malformed binary numeric, value truncated
'[WARNING] dactest.pbp (101) : $10101000 Malformed binary numeric, value truncated
'[WARNING] dactest.pbp (102) : $10000000 Malformed binary numeric, value truncated
'[MESSAGE] pic16f1705.pbpinc(351): HPWM command only supports CCP channels (not PWM channels).
' These compile okay:
FVRCON = 197 ' Enabled, Vref 1.024V, DAC1out1 (RA0).
' FVRCON = 201 ' Enabled, Vref 2.048V, DAC1out1 (RA0).
' FVRCON = 205 ' Enabled, Vref 4.096V, DAC1out1 (RA0).
DAC1CON0 = 168 ' Vref from FVR.
DAC1CON1 = 128 ' Set initial output value to 50% of Vref.
TRISA = %000100 ' A.2 pot input.
TRISC = %001000 ' C.3 serial in.
Pause 1000 ' Short wait for things to settle.
debug "I'm Alive!", 13,10 ' Eureka moment.
pause 3000 ' Time enough to gloat.
goto First ' Jump subs.
'=========================================================================================================
' Subroutines
'=========================================================================================================
'=========================================================================================================
' Main
'=========================================================================================================
First:
for a = 0 to 255 step 7 ' Some coarse jumps.
DAC1CON1 = a
debug "DAC = ",#a,13,10 '
pause 2000 ' Let the DMM settle.
next
goto first ' Cycle.
end
