Starting with an unknown board
https://plus.google.com/u/0/+JamesNewton/posts/CKnu7yU9BGv
found by a local electronics recycler:
http://www.ourplanetrecycling.com/
This board is from a muscle stimulant system for post surgery recovery, manufactured by/for, and distributed by VQ Orthocare. There are newer units to replace it now. This unit is the SurgiStim3, and has been replaced with SurgiStim4. If you power it up with >5V, and ground the third pin from the left of J2, the unit powers up, shows an opening screen from half a second or so, then goes to a screen that says your authorized time of use has elapsed and to put it in the cradle overnight for updates.
It appears that J1 is an ICSP connector. A quick run through with the meter
indicates that the pinout of the connector is ...
Pin 1 is VDD (5V),
Pin 2 is Clock,
Pin 3 is Data,
Pin 4 is Reset, and
Pin 5 is Ground.
I have verified that the PIC can indeed be erased and programmed via a PICKit3
{ed: this might be a great board for the Minimal Controller Idea }
;================================================ ; ; Simple code example to test port pin and USART ; ;================================================ ; Configuration list p=18F8720 #include P18F8720.INC CONFIG OSC = HS CONFIG WDT = OFF CONFIG LVP = OFF CONFIG DEBUG = OFF ;================================================ ; Variables cblock 0x20 Temp endc org 0 ;================================================ ; Initialize init: clrf PORTB ; Configure RB7 on PORTB for bcf TRISB, RB7 ; digital I/O for an LED. bcf TRISC, RC6 ; Set TRISC<6:7> to enable. pic Pin 37 (xmt) bsf TRISC, RC7 ; serial. pic Pin 38 (rcv) bcf PORTB, RB7 ; Turn LED off. pic Pin 47 movlw 0x67 ; serial eusart to 9600 (0x19 with BRGH=0) movwf SPBRG1 ; baud. (0x67 with BRGH=1) movlw b'00100100' ; Enable Transmit and clear SYNC movwf TXSTA1 ; to allow asynchronous mode. movlw b'10010000' ; Enables Serial Port movwf RCSTA1 ; and Continuous Receive bcf RCSTA1, CREN ; Clear any errors by disbaling nop ; continuous receive mode, then bsf RCSTA1, CREN ; renable conitnuous receive mode receive bsf PORTB, 7 movf RCREG1,W nop nop btfss PIR1,5 ; (5) check for received data RC1IF goto $ - 2 movf RCREG1,W ; save received data in W bcf PORTB, 7 toggle: ; Toggle back and forth btg Temp, 0 ; between loading 'U' btfsc Temp, 0 ; and loading 'G' in the goto load_U ; W register. goto load_G ; ... load_U: bsf LATB,7 ; ... movlw 'R' ; Put 'R' in W and call tx movlw 'B' call tx movlw '7' call tx movlw ' ' call tx movlw 'O' ; Put 'G' in W and call tx movlw 'n' call tx movlw 0x0A ; Put 'CR/LF' in W and transmit. call tx movlw 0x0D call tx btfss PIR1,5 ; (5) wait for received data RC1IF goto $ - 2 movlw 'D' subwf RCREG1,W btfsc STATUS,Z goto toggle goto load_U goto toggle load_G: bcf LATB,7 ; ... movlw 'R' ; Put 'G' in W and call tx movlw 'B' call tx movlw '7' call tx movlw ' ' call tx movlw 'O' ; Put 'G' in W and call tx movlw 'f' call tx movlw 'f' call tx movlw 0x0A ; Put 'CR/LF' in W and transmit. call tx movlw 0x0D call tx btfss PIR1,5 ; (5) wait for received data RC1IF goto $ - 2 movlw 'U' subwf RCREG1,W btfsc STATUS,Z goto toggle goto load_G tx: movwf TXREG ; Move W into tx register and provide nop ; a cycle for TXIF to update. check: btfss PIR1, TXIF ; Wait for tx by monitoring TXIF goto check ; Goto check while not done. return end
file: /Techref/microchip/18F8720-j.htm, 6KB, , updated: 2016/1/6 21:36, local time: 2024/8/14 22:30,
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Ashley Roll has put together a really nice little unit here. Leave off the MAX232 and keep these handy for the few times you need true RS232! |
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