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CFA633-RDI-KS 数据表(PDF) 81 Page - Crystalfontz America, Inc. |
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CFA633-RDI-KS 数据表(HTML) 81 Page - Crystalfontz America, Inc. |
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81 / 88 page  Crystalfontz America, Inc. Data Sheet Release Date 2012/02/21 www.crystalfontz.com CFA633-RDI-KS LCD Module (Hardware v2.0 / Firmware s2v1) February 2012 Page 81 _cloop: bcf STATUS,C ; clear carry for CRC register shift rrcf dsplyCRCData,f ; perform shift of data into CRC ;register rrcf dsplyCRC,F rrcf dsplyCRC+1,F btfss STATUS,C ; skip jump if carry goto _notset ; otherwise goto next bit movlw 0x84 xorwf dsplyCRC,F movlw 0x08 ; XOR poly mask with CRC register xorwf dsplyCRC+1,F _notset: decfsz dsplyCRCCount,F ; decrement bit counter bra _cloop ; loop if not complete return ;=================================================================== ; example to clear screen dsplyFSR1_TEMP equ 0x83A ; 16-bit save for FSR1 for display ; message handler dsplyCRC equ 0x83C ; 16-bit CRC (H/L) dsplyLPCNT equ 0x83E ; 8-bit save for display message ; length - CRC dsplyCRCData equ 0x83F ; 8-bit CRC data for display use dsplyCRCCount equ 0x840 ; 8-bit CRC count for display use SendCount equ 0x841 ; 8-bit byte count for sending to ; display RXBUF2 equ 0x8C0 ; 32-byte receive buffer for ; Display TXBUF2 equ 0x8E0 ; 32-byte transmit buffer for ; Display ;------------------------------------------------------------------- ClearScreen: movlb RAM8 movlw .0 movwf SendCount movlw 0xF3 movwf dsplyCRC ; seed ho for CRC calculation movlw 0x21 movwf dsplyCRC+1 ; seen lo for CRC calculation call ClaimFSR1 movlw 0x06 movwf TXBUF2 LFSR FSR1,TXBUF2 movf SendCount,w movwf TXBUF2+1 ; message data length call BMD1 goto SendMsg ;=================================================================== ; send message via interrupt routine. The code is made complex due ; to the limited FSR registers and extended memory space used ; ; example of sending a string to column 0, row 0 ;------------------------------------------------------------------- SignOnL1: call ClaimFSR1 lfsr FSR1,TXBUF2+4 ; set data string position SHOW C0R0,BusName ; move string to TXBUF2 movlw .2 ; addwf SendCount ; movff SendCount,TXBUF2+1 ; insert message data length call BuildMsgDSPLY call SendMsg return ;=================================================================== ; BuildMsgDSPLY used to send a string to LCD ;------------------------------------------------------------------- |
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