Sameer Sathe of sameerksathe shares this code:
This is the code to actually enter the code into mcu via USART , it will only accept the code unless & until u only press capital 'S'. Without using any Interrupt , its a poleing type code+;-------------------------------------------------------------------------------------- USART_REC BANKSEL PIR1 btfss PIR1,RCIF ; Test for received data flag GOTO USART_REC_returns BTFSC RCSTA,OERR goto overerror ; check for over run error BTFSC RCSTA,FERR GOTO frameerror ; CHECK FOR FRAMING ERROR movf RCREG,W ; Store data in W MOVWF HAULT_KEY goto HAULT_DECIDE overerror bcf rcsta,cren ;pulse cren off... movf rcreg,w ;flush fifo movf rcreg,w ; all three elements. movf rcreg,w bsf rcsta,cren ;turn cren back on. ;this pulsing of cren ;will clear the oerr flag. ;enable interrupts. goto USART_REC ;try again... frameerror movf rcreg,w ;reading rcreg clears ferr flag. bsf intcon,gie ;enable interrupts. goto USART_REC ;try again... ;-------------------------------------------------------------------------------------------- HAULT_DECIDE ; CHECK IF THE KEY PRESSED ID 'S' OR RESUME NORMAL SEND DATA FUNCTION MOVLW 0X53 ; capital S SUBWF HAULT_KEY BTFSS STATUS,C goto USART_REC_returns BTFSS STATUS,Z goto USART_REC_returns continue to key enter routine
file: /Techref/microchip/serial-sameer.htm, 1KB, , updated: 2016/11/15 12:17, local time: 2024/8/31 20:04,
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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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