diff options
Diffstat (limited to 'board-js2x')
| -rw-r--r-- | board-js2x/slof/helper.fs | 9 | ||||
| -rw-r--r-- | board-js2x/slof/rtc.fs | 4 |
2 files changed, 13 insertions, 0 deletions
diff --git a/board-js2x/slof/helper.fs b/board-js2x/slof/helper.fs index 1e2b030..c522c90 100644 --- a/board-js2x/slof/helper.fs +++ b/board-js2x/slof/helper.fs @@ -37,3 +37,12 @@ ENDCASE drop ; + +\ count the number of bits equal 1 +\ the idea is to clear in each step the least significant bit +\ v&(v-1) does exactly this, so count the steps until v == 0 +: cnt-bits ( 64-bit-value -- #bits=1 ) + dup IF + 41 1 DO dup 1- and dup 0= IF drop i LEAVE THEN LOOP + THEN +; diff --git a/board-js2x/slof/rtc.fs b/board-js2x/slof/rtc.fs index 861b3f9..5d5dbc3 100644 --- a/board-js2x/slof/rtc.fs +++ b/board-js2x/slof/rtc.fs @@ -40,6 +40,10 @@ \ PC87417.pdf page 156 (chapter 8.3.15) - RTC Control Register C 00 0c rtc! +: bcd-to-bin ( bcd -- bin ) + dup f and swap 4 rshift a * + +; + \ read from the rtc and do the bcd-to-bin conversion : rtc-bin@ ( offset -- value ) rtc@ bcd-to-bin |