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1 ;=============================================================================
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2 ;
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3 ; File rtc.asm ## V2.98c
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4 ;
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5 ;
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6 ; Copyright (c) 2011, JD Gascuel, HeinrichsWeikamp, all right reserved.
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7 ;=============================================================================
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8 ; HISTORY
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9 ; 2011-08-08 : [mH] moving from OSTC code
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10
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275
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11 #include "hwos.inc"
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12 #include "math.inc"
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13
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14 rtc CODE
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15
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16 ;=============================================================================
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17
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18 global rtc_init
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19 rtc_init:
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20 movlw .1
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21 movwf secs
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22 movlw .59
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23 movwf mins
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24 movlw .12
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25 movwf hours
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26 movlw .2
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27 movwf day
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28 movlw .12
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29 movwf month
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30 movlw .17
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31 movwf year
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32 ; rcall rtc_set_rtc ; writes mins,sec,hours,day,month and year to rtc module
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33 ; return
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34
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35 global rtc_set_rtc
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36 rtc_set_rtc:
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37 banksel 0xF16 ; Addresses, F16h through F5Fh, are also used by SFRs, but are not part of the Access RAM
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38 movlw 0x55
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39 movwf EECON2
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40 movlw 0xAA
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41 movwf EECON2
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42 bsf RTCCFG,RTCWREN ; Unlock sequence for RTCWREN
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43 bsf RTCCFG,RTCPTR1
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44 bsf RTCCFG,RTCPTR0 ; year
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45 movff year,WREG
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46 rcall rtc_dec2bcd ; IN: WREG in decimal, OUT: WREG in BCD, also sets to bank16h!
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47 movwf RTCVALL ; year
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48 movwf RTCVALH ; dummy write
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49 movff day,WREG
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50 rcall rtc_dec2bcd ; IN: WREG in decimal, OUT: WREG in BCD, also sets to bank16h!
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51 movwf RTCVALL ; day
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52 movff month,WREG
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53 rcall rtc_dec2bcd ; IN: WREG in decimal, OUT: WREG in BCD, also sets to bank16h!
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54 movwf RTCVALH ; month
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55 movff hours,WREG
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56 rcall rtc_dec2bcd ; IN: WREG in decimal, OUT: WREG in BCD, also sets to bank16h!
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57 movwf RTCVALL ; hours
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58 movlw d'0'
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59 rcall rtc_dec2bcd ; IN: WREG in decimal, OUT: WREG in BCD, also sets to bank16h!
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60 movwf RTCVALH ; weekday
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61 movff secs,WREG
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62 rcall rtc_dec2bcd ; IN: WREG in decimal, OUT: WREG in BCD, also sets to bank16h!
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63 movwf RTCVALL ; secs
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64 movff mins,WREG
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65 rcall rtc_dec2bcd ; IN: WREG in decimal, OUT: WREG in BCD, also sets to bank16h!
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66 movwf RTCVALH ; minutes
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67 movlw 0x55
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68 movwf EECON2
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69 movlw 0xAA
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70 movwf EECON2
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71 bcf RTCCFG,RTCWREN ; Lock sequence for RTCWREN
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72 banksel common
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73 return
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74
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75 rtc_dec2bcd:
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76 banksel lo
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77 movwf lo ; Input in decimal
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78 setf hi ; 10s
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79 rtc_dec2bcd2:
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80 incf hi,F ; Count 10's
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81 movlw d'10'
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82 subwf lo,F
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83 btfss STATUS,N
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84 bra rtc_dec2bcd2
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85 movlw d'10'
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86 addwf lo,F ; 1s
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87 swapf hi,W ; swap to bit 7-4 -> WREG
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88 addwf lo,W ; Result in BCD
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89 banksel 0xF16 ; Addresses, F16h through F5Fh, are also used by SFRs, but are not part of the Access RAM
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90 return
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91
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92 END |
