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if (Polarity == Pos) btfsc RXPort, RXPin ; Con rm Data is Correct else btfss RXPort, RXPin
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REUSE, RETURN, AND RECYCLE
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endif goto SerialRX ; If Just a Glitch , Restart Start Bit ; Poll movlw 8 ; Wait for 8 Bits SRXLoop if ((BitDlay - 10) > 770) ; Check to See if Value is Too Large DlayMacro 770 ; Put in a Double Delay DlayMacro BitDlay - (770 + 10) else DlayMacro BitDlay - 10 ; Wait for the Middle of the Next Bit endif bcf STATUS, C if (Polarity == Pos) btfsc RXPort, RXPin else btfss RXPort, RXPin endif bsf STATUS, C rrf NRZTemp, f subwf NRZTemp, w xorlw 0x0FF addwf NRZTemp, w btfss STATUS, Z goto SRXLoop ; Check the Incoming Data
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; Shift in the Bit ; Decrement and End if == 0
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if ((BitDlay - 9) > 770); Check to See if Value is Too Large DlayMacro 770 ; Put in a Double Delay DlayMacro BitDlay - (770 + 9) else DlayMacro BitDlay - 9 ; Wait for the Middle of the Next Bit endif if (Polarity == Pos) btfss RXPort, RXPin else btfsc RXPort, RXPin endif goto SerialRX movf NRZTemp, w return ; Devices SerialTX movwf NRZTemp movlw 10 bcf STATUS, C ; Is there a Stop Bit
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; No, Start All Over Again ; Return the Received Byte ; Note - Zero Returned in Low-End
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APPENDIX G
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STXLoop if (Polarity == Pos) ; Output the Current Bit btfsc STATUS, C else btfss STATUS, C endif goto $ + 4 ; 6 Cycles Required Each Time nop bcf TXPort, TXPin ; Output a Low goto $ + 3 bsf TXPort, TXPin ; Output a High goto $ + 1 if ((BitDlay - 15) > 770) ; Check to See if Value is Too Large DlayMacro 770 ; Put in a Double Delay DlayMacro BitDlay - (770 + 15) else DlayMacro BitDlay - 15 ; Wait for the Middle of the Next Bit endif subwf NRZTemp, w ; Decrement the Bit Counter xorlw 0x0FF addwf NRZTemp, w btfsc STATUS, Z return ; Can Return to Caller bsf STATUS, C ; Shift Down the Next Bit rrf NRZTemp, f goto STXLoop endm
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If you are working with a mid-range PIC microcontroller, you also can invoke the NRZSerialNISetup macro that creates the SerialSetup subroutine. This subroutine puts the TX pin in output mode and drives an idle output. This subroutine should be executed as early as possible after the application has started. This will ensure that the PIC microcontroller does not inadvertently cause the receiver to process invalid data by missing the rst start bit.
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NRZSerialNISetup Macro TXPort, TXPin, Polarity SerialSetup ; Setup the Serial I/O Bits bsf STATUS, RP0 bcf TXPort, TXPin ; Make TX Pin an Output bcf STATUS, RP0 if (Polarity == Pos) bsf TXPort, TXPin ; Transmit idle else bcf TXPort, TXPin endif return endm
REUSE, RETURN, AND RECYCLE
Sending a byte is as simple as loading the w register with the ASCII byte to transmit and calling SerialTX. By calling a SerialRX, the PIC microcontroller will poll the RX pin until a valid byte has been received. In mid-range devices, on return from SerialRX, the w register will have the byte received. For low-end PIC microcontrollers, you will have to retrieve the received byte from the variable NRZTemp because there is no way to return data from a subroutine in the w register. When using this macro, you will have to declare the DlayCount and NRZTemp variables. If you are going to use this macro, then you will have to run without interrupts and make sure that data is transmitted and received in such a way that nothing is lost. This isn t a huge hardship, but it is one that you should be aware of. If you want to have better performance in your mid-range PIC microcontroller, you can use the TMR0 interrupt to poll the receive line and send data at a regular byte interval. The macro presented below will enable the TMR0 interrupt to send a request to the processor three times each potential bit. I have described this algorithm elsewhere in this book, and the base code itself is taken from the YAP-II s interrupt handler/serial interface. Invocation of the interrupt-based serial interface is similar, with the only differences being that the macro name is slightly different and that this code should be put at the start of the application (ideally at the reset vector). The code itself will install an interrupt handler, along with hardware (I/O ports, TMR0, and interrupts) initialization and the SerialRX and SerialTX subroutines. These subroutines work exactly the same as the bit banging version of the serial I/O macro, except that while they are operating, the interrupt handler can execute simultaneous transmits and receives.
NRZSerialI Macro TXPort, TXPin, RXPort, RXPin, Polarity, Rate, Frequency variable BitDlay, Prescaler, TMR0Reset BitDlay = (Frequency / (3 * 4 * Rate)) - 10 TMR0Reset = BitDlay / 2 ; Using TMR0, Calculate the Timer Reset Value Prescaler = 0 ; And the Prescaler while (TMR0Reset > 0x0FF) ; Find the Proper Reset Value TMR0Reset = TMR0Reset / 2 Prescaler = Prescaler + 1 endw if (Prescaler > 7) ; Can t Use TMR0 error Bit Delay cannot use TMR0 for Polling Clock endif TMR0Reset = 256 - TMR0Reset ; Get the TMR0 Reset Value goto AfterInt org 4 Int movwf _w movf STATUS, w ; Jump to After Interrupt ; Interrupt Handler
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