diff options
| -rw-r--r-- | lmx2487lib.lua | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/lmx2487lib.lua b/lmx2487lib.lua index 4a0e48c..bfaf717 100644 --- a/lmx2487lib.lua +++ b/lmx2487lib.lua @@ -63,6 +63,34 @@ function set_lmx2487_board_to_default_state() update_lmx2487state() end +function freq2regestersValues(freq) + + local F_COMP = 5000000 -- magic number + local N = freq / F_COMP + + local RF_N = math.floor(N) + + local frac = math.abs(N - RF_N) + + local RF_FD = 4000000 --magic number + local RF_FN = math.floor( (frac * RF_FD) + 0.5) + + return freq, RF_N, RF_FN, RF_FD +end +-- test freq2regestersValues +fIn = 6.834e9 +freq, RF_N, RF_FN, RF_FD = freq2regestersValues(fIn) +if freq ~= fIn and RF_N ~= 1366 and RF_FN ~= 3200000 and 4000000 then + print("ERROR in freq2regestersValues") +end +fIn=nil +freq=nil +RF_N=nil +RF_FN=nil +RF_FD=nil +-- end of freq2regestersValues test + + -- bits in mask counted starting from position 1, -- i.e. 1 sets bit in 1st pos, 2 sets bit in 2nd pos mask_bits14to24=bit.lshift( bit.bit(11)-1, 13) |