I need to replace the 12C508A in a device. I need more memory since PBP isn't as efficient as ASM. The original 12C508A is a wide SOIC-8 and I can only get 12C509A or 12F509 with that footprint.
My code for the 12F509 doesn't work - there's no output after the copyright message - but the same code works using a 12F629.
12F62912F509Code:'=======================| RF RECEIVER |=========================
'MR26X629.BAS
'PIC12F629 @ 4MHz 478 words uses MPASM
'Pin 1 - Vdd
'Pin 2 - GPIO.5
'Pin 3 - GPIO.4
'Pin 4 - GPIO.3
'Pin 5 - GPIO.2 RS232 output @ 9600bps
'Pin 6 - GPIO.1 Receives up to 48 bits of PDM/PWM RF with lead-in of 2-9mS
'Pin 7 - GPIO.0
'Pin 8 - Vss
'===============================================================
@ __config _INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_ON & _MCLRE_OFF & _CP_OFF
DEFINE OSCCAL_1K 1
DEFINE OSC 4
DEFINE DEBUG_REG GPIO
DEFINE DEBUG_BIT 2
DEFINE DEBUG_MODE 1
DEFINE DEBUG_BAUD 9600
RF VAR byte[6]
period VAR word
i VAR byte
bits VAR byte
bytes VAR byte
sof VAR byte
x VAR byte
CMCON =%00000111 'disable comparators
INTCON =%00000000 'disable interrupts
OPTION_REG =%10000101 'TMR0 1:64 prescaler
DEBUG "MR26X",13,10
Debug "Copyright ",169," 2009 dlh",13,10
init: RF[0]=0:RF[1]=0:RF[2]=0:RF[3]=0:RF[4]=0:RF[5]=0
While !GPIO.1:Wend 'wait rising edge
TMR0=0 'clear TMR0
While GPIO.1:Wend 'wait falling edge
sof=TMR0 'read TMR0
If (sof<29) Then init '1920µS
If (sof>145) Then init '9280µS
OPTION_REG=%10000011 'TMR0 1:16 prescaler
While !GPIO.1:Wend 'wait rising edge
TMR0=0 'clear TMR0
i=0
Repeat
While GPIO.1 'wait falling edge
If TMR0>155 Then break '2480µS
Wend 'falling edge
While !GPIO.1 'wait rising edge
If TMR0>155 Then break '2480µS
Wend 'rising edge
Period=TMR0:TMR0=0 'clear TMR0
If (period<49) Then init '800µS
If (period>93) Then '1500µS
RF.0(i)=1
EndIf
i=i+1
Until (i>47)
break: If (i<12) Then init
bytes=i/8
If i//8 Then
bytes=bytes+1
EndIf
x=i:GoSub sendhx
For i = 0 to bytes-1
x=RF[i]:GoSub sendhx
Next
Debug 13,10
GoTo init
sendhx: Debug "$"
If x>>4<10 Then
Debug x>>4+48
Else
Debug x>>4+55
EndIf
if x//16<10 Then
Debug x//16+48
Else
Debug x//16+55
EndIf
Return
End
Code:'=======================| RF RECEIVER |=========================
'MR26X509.BAS
'PIC12F509 @ 4MHz 654 words uses MPASM
'Pin 1 - Vdd
'Pin 2 - GPIO.5
'Pin 3 - GPIO.4
'Pin 4 - GPIO.3
'Pin 5 - GPIO.2 RS232 output @ 9600bps
'Pin 6 - GPIO.1 Receives up to 48 bits of PDM/PWM RF with lead-in of 2-9mS
'Pin 7 - GPIO.0
'Pin 8 - Vss
'TMR0 1:64 29=1.9mS,145=9.3mS - 1:16 49=0.8mS,93=1.5ms,155=2.5ms
'===============================================================
@ __config _IntRC_OSC & _WDT_OFF & _MCLRE_OFF & _CP_OFF
DEFINE OSCCAL_1K 1
DEFINE OSC 4
DEFINE DEBUG_REG GPIO
DEFINE DEBUG_BIT 2
DEFINE DEBUG_MODE 1
DEFINE DEBUG_BAUD 9600
RF VAR byte[6]
i VAR byte
period VAR byte
bytes VAR byte
sof VAR byte
x VAR byte
OPTION_REG=%11000101 'TMR0 1:64 prescaler, disable TOCKI
TRISIO=%111101
GPIO=%000000
Debug "MR26X",13,10
Debug "Copyright ",169," 2009 dlh",13,10
init: RF[0]=0:RF[1]=0:RF[2]=0:RF[3]=0:RF[4]=0:RF[5]=0
While !GPIO.1:Wend 'wait rising edge
TMR0=0 'clear TMR0
While GPIO.1:Wend 'wait falling edge
sof=TMR0 'read TMR0
If (sof<29) Then init '1920µS
If (sof>145) Then init '9280µS
OPTION_REG=%11000011 'TMR0 1:16 prescaler
While !GPIO.1:Wend 'wait rising edge
TMR0=0 'reset TMR0
i=0
Repeat
While GPIO.1 'wait falling edge
If TMR0>155 Then break '2480µS
Wend 'falling edge
While !GPIO.1 'wait rising edge
If TMR0>155 Then break '2480µS
Wend 'rising edge
Period=TMR0:TMR0=0 'clear TMR0
If (period<49) Then init '800µS
If (period>93) Then '1500µS
RF.0(i)=1
EndIf
i=i+1
Until (i>47)
break: If (i<12) Then init
bytes=i/8
If i//8 Then
bytes=bytes+1
EndIf
x=i:GoSub sendhx
For i = 0 to bytes-1
x=RF[i]:GoSub sendhx
Next
'Debug 32
'x=sof:GoSub sendhx
Debug 13,10
GoTo init
sendhx: Debug "$"
If x>>4<10 Then
Debug x>>4+48
Else
Debug x>>4+55
EndIf
if x//16<10 Then
Debug x//16+48
Else
Debug x//16+55
EndIf
Return
End
