mrburnette
Senior Member
UPDATED: 20120907: New code attachment
This post is a summary of my QBF blog. Here I have additionally implemented the "U*" string which is the ASCII equivalent of the old RY Baudot code test.
BLOG entry: QBF
The purpose of this code is to simply have a working serial test generator that can be used to feed a known good signal to the PC or to another PICAXE. There are two unused (currently input) pins and so the program can be enhanced to support a second BAUD rate, 4800 as an example. Another enhancement idea that would require a pin would be to switch modes from send to 'receive' ... compare the pattern coming in with a known good pattern in the EEPROM (transferred to RAM.) Other possibilities abound such as putting in custom strings for testing such things as GPS parsing, etc.
- Ray
20120907: Update to code to allow dual-baud 9600/4800 and dual protocol _N/_T and dual messages which can all be reset while the PICAXE is powered. There is now 1 spare PIN that could be used to effect a new option... perhaps 4 BAUD speeds instead of the 2 now implemented.
View attachment 20120907 _08M2_QBF.zip
This post is a summary of my QBF blog. Here I have additionally implemented the "U*" string which is the ASCII equivalent of the old RY Baudot code test.
BLOG entry: QBF
The purpose of this code is to simply have a working serial test generator that can be used to feed a known good signal to the PC or to another PICAXE. There are two unused (currently input) pins and so the program can be enhanced to support a second BAUD rate, 4800 as an example. Another enhancement idea that would require a pin would be to switch modes from send to 'receive' ... compare the pattern coming in with a known good pattern in the EEPROM (transferred to RAM.) Other possibilities abound such as putting in custom strings for testing such things as GPS parsing, etc.
- Ray
Code:
; A Quick Brown Fox ASCII serial test pattern generator
; Public Domain 20120610 by M. Ray Burnette
; 75 bytes / 2048
#picaxe 08m2
#Terminal 9600
SYMBOL CLOCK = m16
SYMBOL BAUDMODE_T = T9600_16 ; Txxx give a true output (idle high) "T=0"
SYMBOL BAUDMODE_N = N9600_16 ; Nxxx give an inverted output (idle low) "T=4"
SYMBOL MONITOR = C.0 ; RS232 output on this pin
SYMBOL BAUD = b0
SYMBOL Looper = b1
SYMBOL Here = b2
SYMBOL There = b3
SetFreq CLOCK
pullup %00011110 ; Manual 2 page 159 08M2 bit0-bit4 = C.1 to C.4
; PIN_1 is POSITIVE PIN_8 is GROUND
; PIN_2 is C.5 is serial_in PIN_7 is C.0 is serial_out
; PIN_3 is C.4 is future PIN_6 is C.1 is future
; PIN_4 is C.3 is string sel PIN_5 is C.2 is HIGH = _N & LOW = _T
BAUD = BAUDMODE_N ; Default to "Inverted" TTL RS232 signaling "idle low"
; Swap to _T mode if indicated
IF PINC.2 = 0 then ; IS the Physical pin #5 0n 08M2 at ground?
BAUD = BAUDMODE_T ; Default to "Inverted TTL RS232 signaling "idle high"
ENDIF
; Example: For Scott Edwards display: BAUD = BAUDMODE_N
; Example: For SparkFun display: BAUD = BAUDMODE_T
; Example: For PC Hyperterminal: BAUD = BAUDMODE_N
; The defaults should allow the chip to communicate with the PC
PAUSE 8000
DISCONNECT ; Stop polling for Serial Input
; Load higher RAM memory with EEPROM string
bptr = 28 ; BANK 0 == addresses 0 --> 27 for Named Variables
; Default to EEPROM containing string Quick Brown Fox
Here = 0
There = 63
IF PINC.3 = 0 then ; If Physical pin #4 is grounded, alternate string
Here = 64
There = 127
EndIF
For b1 = Here to There ; Load EEPROM into RAM
READ b1, @bptrinc
Next b1
; Spool string from RAM forever...
Do
bptr = 28
For b1 = 0 to 64
serout MONITOR, BAUD, (@bptrinc)
Next b1
serout MONITOR, BAUD, (CR, LF)
Pause 1000
Loop
' 64 Bytes
; "$" included for future enhancement to allow qualifier testing
EEPROM 0, ("$The Quick Brown Fox Jumped Over The Lazy Dogs Back.0123456789!#")
EEPROM 64,("U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*U*")
; IDEAS for future enhancements
; PIN3 port C.4 selection for Output (default) and Input (receiving on Pin2)
; PIN6 port C.1 selection for an alternate BAUD, perhaps 480020120907: Update to code to allow dual-baud 9600/4800 and dual protocol _N/_T and dual messages which can all be reset while the PICAXE is powered. There is now 1 spare PIN that could be used to effect a new option... perhaps 4 BAUD speeds instead of the 2 now implemented.
View attachment 20120907 _08M2_QBF.zip
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