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; Drop the Data Line ; Drop the Clock Line
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REUSE, RETURN, AND RECYCLE
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DlayMacro Dlay - 2 return I2CStop DlayMacro Dlay bsf ClockPort, ClockPin DlayMacro Dlay bsf DataPort, DataPin return I2CRead bsf I2CTemp, 0 btfsc STATUS, C bcf I2CTemp, 0 bsf STATUS, RP0 bsf DataPort, DataPin bcf STATUS, RP0 movlw 0x010 - 8 I2CRLoop bsf ClockPort, ClockPin DlayMacro (Dlay / 2) - 1 bcf STATUS, C btfsc DataPort, DataPin bsf STATUS, C DlayMacro (Dlay / 2) - 2 bcf ClockPort, ClockPin rlf I2CTemp, f andlw 0x07F btfsc STATUS, C iorlw 0x080 addlw 0x001 DlayMacro Dlay - 9 btfss STATUS, DC goto I2CRLoop bcf DataPort, DataPin bsf STATUS, RP0 bcf DataPort, DataPin bcf STATUS, RP0 andlw 0x080 btfss STATUS, Z bsf DataPort, DataPin DlayMacro Dlay / 18 bsf ClockPort, ClockPin DlayMacro Dlay bcf ClockPort, ClockPin bcf DataPort, DataPin movf I2Ctemp, w return
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; Wait for the Speci ed Period ; Exit with Clock = Low, Data = Low ; Pass Stop Bit to I2C Device ; Clock Bit High
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; Exit with Clock = High, Data = High ; Read 8 Bits from the Line ; Reply with ACK in Carry Flag ; Put in the Carry Flag ; If Carry Set, then Send Ack (-ative) ; Let the I2C Device Drive the Data Line
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; Bring the Clock Line Up
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; Sample the Incoming Data
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; Shift in the Bit ; Store the Ack of Bit 7 of the Data ; If High, Set Bit 7 ; Finished, Do the Next Bit ; Put in TLow
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; Send Ack Bit
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; High or Low ; Low, Send Ack ; Any Reason to delay
; Get the Received Byte ; Return with Clock = Data = Low
APPENDIX G
I2CSend movwf I2CTemp movlw 0x010 - 8 I2CSLoop rlf I2CTemp, f btfsc STATUS, C goto $ + 4 nop bcf DataPort, DataPin goto $ + 3 bsf DataPort, DataPin goto $ + 1 bsf ClockPort, ClockPin DlayMacro Dlay bcf ClockPort, ClockPin DlayMacro Dlay - 12 addlw 1 btfss STATUS, DC goto I2CSLoop DlayMacro 6 bsf STATUS, RP0 bsf DataPort, DataPin bcf STATUS, RP0 bsf ClockPort, ClockPin DlayMacro (Dlay / 2) - 1 bcf STATUS, C btfss DataPort, DataPin bsf STATUS, C DlayMacro (Dlay / 2) - 2 bsf STATUS, RP0 bcf DataPort, DataPin bcf STATUS, RP0 bcf ClockPort, ClockPin bcf DataPort, DataPin return endm
; Send the 8 Bits in w and Return Ack
; Shift up the Data into C
; Low Bit ; High Bit ; Strobe Out the Data
; Now, Get the Ack Bit
; Line Low, Ack Received
; Return with Ack in Carry, ; Clock = Data = Low
Invoking the macro may seem a bit overwhelming (but it really isn t). Normally, when I create applications that use speci c pins for speci c functions, I use the #de ne directive like
#de ne I2CClock PORTA, 0
which, when used with the I2CSetup macro, simpli es the number of parameters and cuts down on the thinking required. Using I2CClock and I2CData de nes, the macro invocation becomes
I2CSetup I2CClock, I2CData, Rate, Frequency
REUSE, RETURN, AND RECYCLE
The Rate parameter is the I2C rate speci ed in kilohertz. The normal two speeds are 100 and 400 kHz. The Frequency parameter is the execution clock speed and is used, along with the Rate parameter, to determine whether or not delays are required to implement the I2C code. When the I2CSetup macro is invoked, one of the rst things that I do is to calculate the Dlay value. This value is used to specify the number of instruction cycles that must be delayed before the next edge is produced. This is similar to the need for delays in the NRZ Serial I/O macros presented in the preceding section. The I2C timings are a lot less critical because all I am doing is trying to make sure that no minimum timings are violated. After invoking the I2CSetup macro, the I2CBitSetup subroutine is called, which sets the I2C clock and data bits as output, and both lines are driven high for the I2C devices connected to the PIC microcontroller to be put into idle state. The Clock line will be driven at all times by the PIC microcontroller, but the Data line should be pulled up (with a 1- k to 10-k resistor for the 400- and 100-kHz data rates, respectively) to allow devices with open collector drives to work. To send data, the I2CStart subroutine is called, followed by the I2CSend, I2CRead, and I2CStop subroutines. The w register is used for passing data back and forth, and the carry ag is used to indicate the state of the acknowledge bit. When carry is set, the acknowledgement (Ack) is received; when carry is reset, a Nack is received. This is also true for sending data to the I2C peripheral device. Earlier in the book I discussed sending serial data to I2C devices using the format
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