From CocaColaKid:
I have used an assembler routine with the 1302 (in a basic program) and it works:Code:'-------------------------- Clock Variables --------------------------------- rst var portb.2 ' DS1302 Reset Pin clk var portb.1 ' DS1302 Clock Pin dq var portb.0 ' DS1302 Data Pin '----------------------- Write Commands For DS1302 -------------------------- writectrl con $8E ' Control byte writeram con $80 ' Write to RAM writeprotect con $00 ' Write-protect DS1302 writesec con $80 ' Write seconds writemin con $82 ' Write minutes writehour con $84 ' Write hour writedate con $86 ' Write date writemonth con $88 ' Write month writeyear con $8C ' Write year '------------------------- Read Commands For DS1302 ------------------------- readsec con $81 ' Read seconds from DS1302 readmin con $83 ' Read minutes from DS1302 readhour con $85 ' Read hours from DS1302 readdate con $87 ' Read date from DS1302 readyear con $8D ' Read year from DS1302 readmonth con $89 ' Read month from DS1302 '------------------------------ Time Variables ------------------------------ mem var byte ' Temporary data holder outbyte var byte ' Second byte to ds1302 reg_adr var byte ' First byte to DS1302 date var byte ' Date variable ss var byte ' Seconds variable mm var byte ' Minutes varibale hh var byte ' Hours variable mo var byte ' Month variable yr var byte ' Year variable '------------------------ Initial Settings For Ports ------------------------ low rst ' Set reset pin low low clk ' Set clock pin low trisb = 0 trisa = 0 '----------------------- Set Initial Time Variables ------------------------- if portb.4 = 1 then START ' Set inital clock start up if jumper is present reg_adr = writectrl ' Set to control byte outbyte = writeprotect ' Set turn off protection gosub w_out ' Send both bytes reg_adr = writesec ' Set to write seconds register outbyte = $00 ' Set to write 00 to seconds register gosub w_out reg_adr = writemin outbyte = $30 gosub w_out reg_adr = writehour outbyte = $00 gosub w_out reg_adr = writedate outbyte = $01 gosub w_out reg_adr = writemonth outbyte = $01 gosub w_out reg_adr = writeyear outbyte = $00 gosub w_out reg_adr = writectrl outbyte = writeprotect gosub w_out start: reg_adr = readsec ' Read seconds gosub w_in ss = mem reg_adr = readmin ' Read minutes gosub w_in mm = mem reg_adr = readhour ' Read Hours gosub w_in hh = mem reg_adr = readyear ' Read Year gosub w_in yr = mem reg_adr = readdate ' Read Date gosub w_in date = mem reg_adr = readmonth ' Read Month gosub w_in mo = mem lcdout $fe,1,"TIME:",HEX2 hh,":",HEX2 mm,":",HEX2 ss pause 500 goto start '----------------------- Time Commands Subroutines -------------------------- w_in: mem = reg_adr ' Set mem variable to reg_adr contents high rst ' Activate the DS1302 shiftout dq,clk,0, [mem] ' Send control byte shiftin dq,clk,1, [mem] ' Retrieve data in from the DS1302 low rst ' Deactivate DS1302 return w_out: mem = reg_adr ' Set mem variable to reg_adr contents high rst ' Activate the DS1302 shiftout dq,clk,0, [mem] ' Send control byte mem = outbyte ' Set mem variable to outbyte contents shiftout dq,clk,0, [mem] ' Send data stored in mem variable to DS1302 low rst ' Deactivate DS1302 return
Cheers, Art.Code:#define SPI_CLK PORTA,1 ; spi bus clock line #define SPI_MOSI PORTA,2 ; spi master out data #define SPI_MISO PORTA,3 ; spi slave input data #define SPI_CE PORTA,4 ; chip enable for SPI device SCRATCH equ 0x40 ; 1 by general purpose scratchpad TMP equ 0x41 ; temp register TMP2 equ 0x42 ; temp register COUNT equ 0x43 ;YRS equ 0x44 ;MON equ 0x45 ;DOW equ 0x46 ;DAYS equ 0x47 ;HRS equ 0x48 ;MINS equ 0x49 ;SECS equ 0x4a ;user_bits equ 0x2C ; ;save_w equ 0x38 ;save_status equ 0x39 ;---- Read RTC into W (assume address already sent) ---- ;---- assumes CE is asserted ---- read_RTC: movlw 08h ;Send 8 bits movwf COUNT SPI_read_loop: rlf TMP, 1 bcf SPI_CLK ; clock data out bcf TMP, 0 ; assume data out is low btfsc SPI_MISO bsf TMP, 0 ; if data out=1, set bit bsf SPI_CLK decfsz COUNT, 1 goto SPI_read_loop movf TMP, W return ;--- Write the byte in W to RTC --- ;---- assumes CE is asserted ---- write_RTC: movwf TMP ;Save the data ; ;--- Do a SPI bus write of byte in 'TMP' --- ; SPI_write: movlw 08h ;Send 8 bits movwf COUNT SPI_w_loop: bcf SPI_CLK bcf SPI_MOSI ; assume data out is low btfsc TMP, 7 bsf SPI_MOSI ; if data out=1, set bit SPI_w_cont: rlf TMP, 1 bsf SPI_CLK ; clock it in decfsz COUNT, 1 goto SPI_w_loop return
Originally Posted by Dennis
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