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Enable arbitrary (multiple of 2) dividers for clock generation #8

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msperl opened this issue Feb 27, 2015 · 4 comments
Closed

Enable arbitrary (multiple of 2) dividers for clock generation #8

msperl opened this issue Feb 27, 2015 · 4 comments
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@msperl
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msperl commented Feb 27, 2015

The documentation says that the clock multiplier should be of power 2 while experimentation shows that a multiple of 2 is sufficient

@msperl
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msperl commented Feb 27, 2015

Here some statistics from the logic-analyzer when running from a divider of 1 to a divider of 1024
Measurements were done with 100MHz sample rates and then counting the low-High edges and the time between first and last:

rDIV requestedHz    measuredHz   mDiv Edges TimeIntoSampe
   1  250000000Hz  250000000Hz    1.0  1   0.00 Above sample rate of logic analyzer
   2  125000000Hz  250000000Hz    1.0  1   1.02 Above sample rate of logic analyzer
   3   83333333Hz  250000000Hz    1.0  1   2.04 Above sample rate of logic analyzer
   4   62500000Hz  250000000Hz    1.0  1   3.06 Above sample rate of logic analyzer
   5   50000000Hz  250000000Hz    1.0  0   4.08 Above sample rate of logic analyzer
   6   41666666Hz  250000000Hz    1.0  1   5.10 Above sample rate of logic analyzer
   7   35714285Hz   19999999Hz   12.5  4   6.13 Above sample rate of logic analyzer
   8   31250000Hz   19999999Hz   12.5  4   7.14 Above sample rate of logic analyzer
   9   27777777Hz   24999999Hz   10.0  7   8.17
  10   25000000Hz   24999999Hz   10.0  7   9.18
  11   22727272Hz   21874999Hz   11.4  7  10.20
  12   20833333Hz   21875000Hz   11.4  7  11.23
  13   19230769Hz   17500000Hz   14.3  7  12.25
  14   17857142Hz   17500000Hz   14.3  7  13.27
  15   16666666Hz   15909090Hz   15.7  7  14.30
  16   15625000Hz   15909090Hz   15.7  7  15.31
  17   14705882Hz   13999999Hz   17.9  7  16.34
  18   13888888Hz   13999999Hz   17.9  7  17.36
  19   13157894Hz   12499999Hz   20.0  7  18.38
  20   12500000Hz   12499999Hz   20.0  7  19.40
  21   11904761Hz   11290322Hz   22.1  7  20.42
  22   11363636Hz   11290322Hz   22.1  7  21.45
  23   10869565Hz   10606060Hz   23.6  7  22.47
  24   10416666Hz   10606060Hz   23.6  7  23.49
  25   10000000Hz   10606060Hz   23.6  7  24.51
  26    9615384Hz    9459459Hz   26.4  7  25.53
  27    9259259Hz    8974358Hz   27.9  7  26.55
  28    8928571Hz    8750000Hz   28.6  7  27.58
  29    8620689Hz    8333333Hz   30.0  7  28.60
  30    8333333Hz    8333333Hz   30.0  7  29.62
  31    8064516Hz    7777777Hz   32.1  7  30.64
  32    7812500Hz    7777777Hz   32.1  7  31.66
  33    7575757Hz    7291666Hz   34.3  7  32.68
  34    7352941Hz    7291666Hz   34.3  7  33.70
  35    7142857Hz    7000000Hz   35.7  7  34.72
  36    6944444Hz    6862745Hz   36.4  7  35.75
  37    6756756Hz    6603773Hz   37.9  7  36.77
  38    6578947Hz    6603773Hz   37.9  7  37.79
  39    6410256Hz    6249999Hz   40.0  7  38.81
  40    6250000Hz    6249999Hz   40.0  7  39.83
  41    6097560Hz    5932203Hz   42.1  7  40.85
  42    5952380Hz    5932203Hz   42.1  7  41.87
  43    5813953Hz    5737704Hz   43.6  7  42.90
  44    5681818Hz    5737704Hz   43.6  7  43.92
  45    5555555Hz    5468750Hz   45.7  7  44.94
  46    5434782Hz    5468750Hz   45.7  7  45.96
  47    5319148Hz    5147058Hz   48.6  7  46.98
  48    5208333Hz    5223880Hz   47.9  7  48.00
  49    5102040Hz    4999999Hz   50.0  7  49.03
  50    5000000Hz    4999999Hz   50.0  7  50.04
  51    4901960Hz    4794520Hz   52.1  7  51.07
  52    4807692Hz    4794520Hz   52.1  7  52.09
  53    4716981Hz    4666666Hz   53.6  7  53.11
  54    4629629Hz    4605263Hz   54.3  7  54.13
  55    4545454Hz    4487179Hz   55.7  7  55.15
  56    4464285Hz    4430379Hz   56.4  7  56.18
  57    4385964Hz    4320987Hz   57.9  7  57.20
  58    4310344Hz    4320987Hz   57.9  7  58.22
  59    4237288Hz    4166666Hz   60.0  7  59.24
  60    4166666Hz    4166666Hz   60.0  7  60.26
  61    4098360Hz    4069767Hz   61.4  7  61.29
  62    4032258Hz    4022988Hz   62.1  7  62.31
  63    3968253Hz    3888888Hz   64.3  7  63.33
  64    3906250Hz    3932584Hz   63.6  7  64.35
  65    3846153Hz    3804347Hz   65.7  7  65.37
  66    3787878Hz    3804347Hz   65.7  7  66.39
  67    3731343Hz    3645833Hz   68.6  7  67.41
  68    3676470Hz    3684210Hz   67.9  7  68.43
  69    3623188Hz    3571428Hz   70.0  7  69.46
  70    3571428Hz    3571428Hz   70.0  7  70.48
  71    3521126Hz    3499999Hz   71.4  7  71.50
  72    3472222Hz    3500000Hz   71.4  7  72.52
  73    3424657Hz    3365384Hz   74.3  7  73.54
  74    3378378Hz    3365384Hz   74.3  7  74.56
  75    3333333Hz    3301886Hz   75.7  7  75.59
  76    3289473Hz    3271028Hz   76.4  7  76.61
  77    3246753Hz    3181818Hz   78.6  7  77.63
  78    3205128Hz    3211009Hz   77.9  7  78.65
  79    3164556Hz    3124999Hz   80.0  7  79.67
  80    3125000Hz    3124999Hz   80.0  7  80.69
  81    3086419Hz    3043478Hz   82.1  7  81.71
  82    3048780Hz    3070175Hz   81.4  7  82.74
  83    3012048Hz    2991452Hz   83.6  7  83.76
  84    2976190Hz    2966101Hz   84.3  7  84.78
  85    2941176Hz    2892561Hz   86.4  7  85.80
  86    2906976Hz    2916666Hz   85.7  7  86.82
  87    2873563Hz    2822580Hz   88.6  7  87.85
  88    2840909Hz    2845528Hz   87.9  7  88.87
  89    2808988Hz    2777777Hz   90.0  7  89.89
  90    2777777Hz    2777777Hz   90.0  7  90.91
  91    2747252Hz    2713178Hz   92.1  7  91.93
  92    2717391Hz    2713178Hz   92.1  7  92.96
  93    2688172Hz    2671755Hz   93.6  7  93.98
  94    2659574Hz    2651515Hz   94.3  7  95.00
  95    2631578Hz    2592592Hz   96.4  7  96.02
  96    2604166Hz    2611940Hz   95.7  7  97.04
  97    2577319Hz    2554744Hz   97.9  7  98.07
  98    2551020Hz    2536231Hz   98.6  7  99.09
  99    2525252Hz    2500000Hz  100.0  7 100.11
 100    2500000Hz    2499999Hz  100.0  7 101.13
 101    2475247Hz    2447552Hz  102.1  7 102.15
 102    2450980Hz    2447552Hz  102.1  7 103.17
 103    2427184Hz    2413793Hz  103.6  7 104.19
 104    2403846Hz    2397260Hz  104.3  7 105.22
 105    2380952Hz    2348993Hz  106.4  7 106.24
 106    2358490Hz    2348993Hz  106.4  7 107.26
 107    2336448Hz    2317880Hz  107.9  7 108.28
 108    2314814Hz    2317880Hz  107.9  7 109.30
 109    2293577Hz    2272727Hz  110.0  7 110.33
 110    2272727Hz    2272727Hz  110.0  7 111.35
 111    2252252Hz    2229299Hz  112.1  7 112.37
 112    2232142Hz    2229299Hz  112.1  7 113.39
 113    2212389Hz    2187500Hz  114.3  7 114.42
 114    2192982Hz    2201257Hz  113.6  7 115.44
 115    2173913Hz    2160493Hz  115.7  7 116.46
 116    2155172Hz    2160493Hz  115.7  7 117.48
 117    2136752Hz    2121212Hz  117.9  7 118.50
 118    2118644Hz    2121212Hz  117.9  7 119.53
 119    2100840Hz    2083333Hz  120.0  7 120.55
 120    2083333Hz    2083333Hz  120.0  7 121.57
 121    2066115Hz    2046783Hz  122.1  7 122.59
 122    2049180Hz    2046783Hz  122.1  7 123.61
 123    2032520Hz    2011494Hz  124.3  7 124.64
 124    2016129Hz    2011494Hz  124.3  7 125.66
 125    2000000Hz    2011494Hz  124.3  7 126.68
 126    1984126Hz    1977401Hz  126.4  7 127.70
 127    1968503Hz    1955307Hz  127.9  7 128.72
 128    1953125Hz    1944444Hz  128.6  7 129.74
 129    1937984Hz    1923076Hz  130.0  7 130.76
 130    1923076Hz    1923076Hz  130.0  7 131.78
 131    1908396Hz    1891891Hz  132.1  7 132.81
 132    1893939Hz    1891891Hz  132.1  7 133.83
 133    1879699Hz    1861702Hz  134.3  7 134.85
 134    1865671Hz    1861702Hz  134.3  7 135.87
 135    1851851Hz    1842105Hz  135.7  7 136.90
 136    1838235Hz    1842105Hz  135.7  7 137.92
 137    1824817Hz    1813471Hz  137.9  7 138.94
 138    1811594Hz    1813471Hz  137.9  7 139.96
 139    1798561Hz    1785714Hz  140.0  7 140.98
 140    1785714Hz    1785714Hz  140.0  7 142.01
 141    1773049Hz    1758793Hz  142.1  7 143.03
 142    1760563Hz    1758793Hz  142.1  7 144.05
 143    1748251Hz    1741293Hz  143.6  7 145.07
 144    1736111Hz    1741293Hz  143.6  7 146.10
 145    1724137Hz    1707317Hz  146.4  7 147.12
 146    1712328Hz    1715686Hz  145.7  7 148.14
 147    1700680Hz    1690821Hz  147.9  7 149.16
 148    1689189Hz    1690821Hz  147.9  7 150.18
 149    1677852Hz    1666666Hz  150.0  7 151.21
 150    1666666Hz    1666666Hz  150.0  7 152.23
 151    1655629Hz    1643192Hz  152.1  7 153.25
 152    1644736Hz    1650943Hz  151.4  7 154.27
 153    1633986Hz    1620370Hz  154.3  7 155.30
 154    1623376Hz    1620370Hz  154.3  7 156.32
 155    1612903Hz    1598173Hz  156.4  7 157.34
 156    1602564Hz    1598173Hz  156.4  7 158.36
 157    1592356Hz    1583710Hz  157.9  7 159.38
 158    1582278Hz    1583710Hz  157.9  7 160.41
 159    1572327Hz    1562499Hz  160.0  7 161.43
 160    1562500Hz    1562499Hz  160.0  7 162.45
 161    1552795Hz    1541850Hz  162.1  7 163.47
 162    1543209Hz    1548672Hz  161.4  7 164.49
 163    1533742Hz    1521739Hz  164.3  7 165.51
 164    1524390Hz    1521739Hz  164.3  7 166.53
 165    1515151Hz    1502145Hz  166.4  7 167.56
 166    1506024Hz    1508620Hz  165.7  7 168.58
 167    1497005Hz    1489361Hz  167.9  7 169.60
 168    1488095Hz    1489361Hz  167.9  7 170.62
 169    1479289Hz    1470588Hz  170.0  7 171.65
 170    1470588Hz    1470588Hz  170.0  7 172.67
 171    1461988Hz    1452282Hz  172.1  7 173.69
 172    1453488Hz    1452282Hz  172.1  7 174.71
 173    1445086Hz    1434426Hz  174.3  7 175.74
 174    1436781Hz    1440329Hz  173.6  7 176.76
 175    1428571Hz    1422764Hz  175.7  7 177.78
 176    1420454Hz    1417004Hz  176.4  7 178.80
 177    1412429Hz    1400000Hz  178.6  7 179.82
 178    1404494Hz    1405622Hz  177.9  7 180.85
 179    1396648Hz    1388888Hz  180.0  7 181.87
 180    1388888Hz    1388888Hz  180.0  7 182.89
 181    1381215Hz    1372549Hz  182.1  7 183.91
 182    1373626Hz    1377952Hz  181.4  7 184.94
 183    1366120Hz    1356589Hz  184.3  7 185.96
 184    1358695Hz    1361867Hz  183.6  7 186.98
 185    1351351Hz    1346153Hz  185.7  7 188.00
 186    1344086Hz    1340996Hz  186.4  7 189.02
 187    1336898Hz    1325757Hz  188.6  7 190.05
 188    1329787Hz    1325757Hz  188.6  7 191.07
 189    1322751Hz    1315789Hz  190.0  7 192.09
 190    1315789Hz    1315789Hz  190.0  7 193.11
 191    1308900Hz    1301115Hz  192.1  7 194.14
 192    1302083Hz    1301115Hz  192.1  7 195.16
 193    1295336Hz    1286764Hz  194.3  7 196.18
 194    1288659Hz    1286764Hz  194.3  7 197.20
 195    1282051Hz    1277372Hz  195.7  7 198.23
 196    1275510Hz    1277372Hz  195.7  7 199.25
 197    1269035Hz    1263537Hz  197.9  7 200.27
 198    1262626Hz    1263537Hz  197.9  7 201.29
 199    1256281Hz    1249999Hz  200.0  7 202.32
 200    1250000Hz    1249999Hz  200.0  7 203.33
 201    1243781Hz    1236749Hz  202.1  7 204.36
 202    1237623Hz    1241134Hz  201.4  7 205.38
 203    1231527Hz    1228070Hz  203.6  7 206.40
 204    1225490Hz    1223776Hz  204.3  7 207.42
 205    1219512Hz    1211072Hz  206.4  7 208.44
 206    1213592Hz    1211072Hz  206.4  7 209.47
 207    1207729Hz    1202749Hz  207.9  7 210.49
 208    1201923Hz    1198630Hz  208.6  7 211.51
 209    1196172Hz    1190476Hz  210.0  7 212.53
 210    1190476Hz    1190476Hz  210.0  7 213.56
 211    1184834Hz    1182432Hz  211.4  7 214.58
 212    1179245Hz    1178451Hz  212.1  7 215.60
 213    1173708Hz    1170568Hz  213.6  7 216.62
 214    1168224Hz    1170568Hz  213.6  7 217.64
 215    1162790Hz    1155115Hz  216.4  7 218.67
 216    1157407Hz    1158940Hz  215.7  7 219.69
 217    1152073Hz    1147540Hz  217.9  7 220.71
 218    1146788Hz    1147540Hz  217.9  7 221.73
 219    1141552Hz    1136363Hz  220.0  7 222.76
 220    1136363Hz    1136363Hz  220.0  7 223.78
 221    1131221Hz    1125401Hz  222.1  7 224.80
 222    1126126Hz    1125401Hz  222.1  7 225.82
 223    1121076Hz    1114649Hz  224.3  7 226.85
 224    1116071Hz    1114649Hz  224.3  7 227.87
 225    1111111Hz    1107594Hz  225.7  7 228.89
 226    1106194Hz    1104100Hz  226.4  7 229.91
 227    1101321Hz    1097178Hz  227.9  7 230.94
 228    1096491Hz    1097178Hz  227.9  7 231.96
 229    1091703Hz    1086956Hz  230.0  7 232.98
 230    1086956Hz    1086956Hz  230.0  7 234.00
 231    1082251Hz    1076923Hz  232.1  7 235.02
 232    1077586Hz    1076923Hz  232.1  7 236.05
 233    1072961Hz    1067073Hz  234.3  7 237.07
 234    1068376Hz    1067073Hz  234.3  7 238.09
 235    1063829Hz    1057401Hz  236.4  7 239.11
 236    1059322Hz    1060606Hz  235.7  7 240.14
 237    1054852Hz    1051051Hz  237.9  7 241.16
 238    1050420Hz    1051051Hz  237.9  7 242.18
 239    1046025Hz    1041666Hz  240.0  7 243.20
 240    1041666Hz    1041666Hz  240.0  7 244.23
 241    1037344Hz    1035502Hz  241.4  7 245.25
 242    1033057Hz    1032448Hz  242.1  7 246.27
 243    1028806Hz    1026392Hz  243.6  7 247.29
 244    1024590Hz    1023391Hz  244.3  7 248.32
 245    1020408Hz    1017441Hz  245.7  7 249.34
 246    1016260Hz    1017441Hz  245.7  7 250.36
 247    1012145Hz    1008645Hz  247.9  7 251.38
 248    1008064Hz    1008645Hz  247.9  7 252.41
 249    1004016Hz     999999Hz  250.0  7 253.43
 250    1000000Hz     999999Hz  250.0  7 254.45
 251     996015Hz     991501Hz  252.1  7 255.47
 252     992063Hz     991501Hz  252.1  7 256.49
 253     988142Hz     983146Hz  254.3  7 257.51
 254     984251Hz     983146Hz  254.3  7 258.54
 255     980392Hz     977653Hz  255.7  7 259.56
 256     976562Hz     974930Hz  256.4  7 260.58
 257     972762Hz     969529Hz  257.9  7 261.60
 258     968992Hz     969529Hz  257.9  7 262.63
 259     965250Hz     961538Hz  260.0  7 263.65
 260     961538Hz     961538Hz  260.0  7 264.67
 261     957854Hz     953678Hz  262.1  7 265.69
 262     954198Hz     953678Hz  262.1  7 266.72
 263     950570Hz     948509Hz  263.6  7 267.74
 264     946969Hz     945945Hz  264.3  7 268.76
 265     943396Hz     938337Hz  266.4  7 269.78
 266     939849Hz     940860Hz  265.7  7 270.81
 267     936329Hz     933333Hz  267.9  7 271.83
 268     932835Hz     933333Hz  267.9  7 272.85
 269     929368Hz     925925Hz  270.0  7 273.87
 270     925925Hz     925925Hz  270.0  7 274.90
 271     922509Hz     918635Hz  272.1  7 275.92
 272     919117Hz     918635Hz  272.1  7 276.94
 273     915750Hz     911458Hz  274.3  7 277.96
 274     912408Hz     913838Hz  273.6  7 278.99
 275     909090Hz     906735Hz  275.7  7 280.01
 276     905797Hz     906735Hz  275.7  7 281.03
 277     902527Hz     899742Hz  277.9  7 282.05
 278     899280Hz     899742Hz  277.9  7 283.07
 279     896057Hz     892857Hz  280.0  7 284.10
 280     892857Hz     892857Hz  280.0  7 285.12
 281     889679Hz     886075Hz  282.1  7 286.14
 282     886524Hz     888324Hz  281.4  7 287.16
 283     883392Hz     879396Hz  284.3  7 288.19
 284     880281Hz     879396Hz  284.3  7 289.21
 285     877192Hz     872817Hz  286.4  7 290.23
 286     874125Hz     874999Hz  285.7  7 291.26
 287     871080Hz     868486Hz  287.9  7 292.28
 288     868055Hz     868486Hz  287.9  7 293.30
 289     865051Hz     862068Hz  290.0  7 294.32
 290     862068Hz     862068Hz  290.0  7 295.35
 291     859106Hz     855745Hz  292.1  7 296.37
 292     856164Hz     855745Hz  292.1  7 297.39
 293     853242Hz     849514Hz  294.3  7 298.41
 294     850340Hz     851581Hz  293.6  7 299.44
 295     847457Hz     843373Hz  296.4  7 300.46
 296     844594Hz     843373Hz  296.4  7 301.48
 297     841750Hz     837320Hz  298.6  7 302.50
 298     838926Hz     839328Hz  297.9  7 303.52
 299     836120Hz     833333Hz  300.0  7 304.55
 300     833333Hz     833333Hz  300.0  7 305.57
 301     830564Hz     827423Hz  302.1  7 306.59
 302     827814Hz     827423Hz  302.1  7 307.61
 303     825082Hz     823529Hz  303.6  7 308.64
 304     822368Hz     821596Hz  304.3  7 309.66
 305     819672Hz     815850Hz  306.4  7 310.68
 306     816993Hz     817757Hz  305.7  7 311.70
 307     814332Hz     812064Hz  307.9  7 312.73
 308     811688Hz     810185Hz  308.6  7 313.75
 309     809061Hz     806451Hz  310.0  7 314.77
 310     806451Hz     806451Hz  310.0  7 315.80
 311     803858Hz     800915Hz  312.1  7 316.82
 312     801282Hz     802752Hz  311.4  7 317.84
 313     798722Hz     797266Hz  313.6  7 318.86
 314     796178Hz     795454Hz  314.3  7 319.89
 315     793650Hz     791855Hz  315.7  7 320.91
 316     791139Hz     790067Hz  316.4  7 321.93
 317     788643Hz     786516Hz  317.9  7 322.95
 318     786163Hz     786516Hz  317.9  7 323.98
 319     783699Hz     781249Hz  320.0  7 325.00
 320     781250Hz     781249Hz  320.0  7 326.02
 321     778816Hz     776053Hz  322.1  7 327.04
 322     776397Hz     777777Hz  321.4  7 328.06
 323     773993Hz     770925Hz  324.3  7 329.08
 324     771604Hz     772626Hz  323.6  7 330.11
 325     769230Hz     765864Hz  326.4  7 331.13
 326     766871Hz     765864Hz  326.4  7 332.15
 327     764525Hz     762527Hz  327.9  7 333.17
 328     762195Hz     762527Hz  327.9  7 334.20
 329     759878Hz     757575Hz  330.0  7 335.22
 330     757575Hz     757575Hz  330.0  7 336.24
 331     755287Hz     752688Hz  332.1  7 337.27
 332     753012Hz     752688Hz  332.1  7 338.29
 333     750750Hz     747863Hz  334.3  7 339.31
 334     748502Hz     749464Hz  333.6  7 340.33
 335     746268Hz     744680Hz  335.7  7 341.36
 336     744047Hz     743099Hz  336.4  7 342.38
 337     741839Hz     739957Hz  337.9  7 343.40
 338     739644Hz     739957Hz  337.9  7 344.42
 339     737463Hz     735294Hz  340.0  7 345.45
 340     735294Hz     735294Hz  340.0  7 346.47
 341     733137Hz     732217Hz  341.4  7 347.49
 342     730994Hz     730688Hz  342.1  7 348.51
 343     728862Hz     727650Hz  343.6  7 349.54
 344     726744Hz     726141Hz  344.3  7 350.56
 345     724637Hz     723140Hz  345.7  7 351.58
 346     722543Hz     723140Hz  345.7  7 352.60
 347     720461Hz     718685Hz  347.9  7 353.63
 348     718390Hz     718685Hz  347.9  7 354.65
 349     716332Hz     714285Hz  350.0  7 355.67
 350     714285Hz     714285Hz  350.0  7 356.69
 351     712250Hz     709939Hz  352.1  7 357.72
 352     710227Hz     709939Hz  352.1  7 358.74
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 726     344352Hz     344149Hz  726.4  7 741.37
 727     343878Hz     343473Hz  727.9  7 742.39
 728     343406Hz     343473Hz  727.9  7 743.42
 729     342935Hz     342465Hz  730.0  7 744.44
 730     342465Hz     342465Hz  730.0  7 745.46
 731     341997Hz     341463Hz  732.1  7 746.49
 732     341530Hz     341796Hz  731.4  7 747.51
 733     341064Hz     340798Hz  733.6  7 748.53
 734     340599Hz     340466Hz  734.3  7 749.56
 735     340136Hz     339805Hz  735.7  7 750.58
 736     339673Hz     339805Hz  735.7  7 751.60
 737     339213Hz     338818Hz  737.9  7 752.63
 738     338753Hz     338491Hz  738.6  7 753.65
 739     338294Hz     337837Hz  740.0  7 754.68
 740     337837Hz     337837Hz  740.0  7 755.70
 741     337381Hz     336862Hz  742.1  7 756.72
 742     336927Hz     336862Hz  742.1  7 757.75
 743     336473Hz     336215Hz  743.6  7 758.77
 744     336021Hz     336215Hz  743.6  7 759.80
 745     335570Hz     334928Hz  746.4  7 760.82
 746     335120Hz     334928Hz  746.4  7 761.84
 747     334672Hz     334288Hz  747.9  7 762.87
 748     334224Hz     334288Hz  747.9  7 763.89
 749     333778Hz     333333Hz  750.0  7 764.91
 750     333333Hz     333333Hz  750.0  7 765.94
 751     332889Hz     332383Hz  752.1  7 766.96
 752     332446Hz     332383Hz  752.1  7 767.98
 753     332005Hz     331753Hz  753.6  7 769.01
 754     331564Hz     331439Hz  754.3  7 770.03
 755     331125Hz     330812Hz  755.7  7 771.06
 756     330687Hz     330500Hz  756.4  7 772.08
 757     330250Hz     329877Hz  757.9  7 773.10
 758     329815Hz     329877Hz  757.9  7 774.13
 759     329380Hz     328947Hz  760.0  7 775.15
 760     328947Hz     328947Hz  760.0  7 776.17
 761     328515Hz     328022Hz  762.1  7 777.20
 762     328083Hz     328022Hz  762.1  7 778.22
 763     327653Hz     327408Hz  763.6  7 779.24
 764     327225Hz     327102Hz  764.3  7 780.27
 765     326797Hz     326492Hz  765.7  7 781.29
 766     326370Hz     326492Hz  765.7  7 782.31
 767     325945Hz     325581Hz  767.9  7 783.34
 768     325520Hz     325581Hz  767.9  7 784.36
 769     325097Hz     324675Hz  770.0  7 785.39
 770     324675Hz     324675Hz  770.0  7 786.41
 771     324254Hz     323774Hz  772.1  7 787.43
 772     323834Hz     323774Hz  772.1  7 788.46
 773     323415Hz     323176Hz  773.6  7 789.48
 774     322997Hz     323176Hz  773.6  7 790.50
 775     322580Hz     321987Hz  776.4  7 791.53
 776     322164Hz     322283Hz  775.7  7 792.55
 777     321750Hz     321395Hz  777.9  7 793.58
 778     321336Hz     321395Hz  777.9  7 794.60
 779     320924Hz     320512Hz  780.0  7 795.62
 780     320512Hz     320512Hz  780.0  7 796.65
 781     320102Hz     319926Hz  781.4  7 797.67
 782     319693Hz     319634Hz  782.1  7 798.69
 783     319284Hz     318761Hz  784.3  7 799.72
 784     318877Hz     318761Hz  784.3  7 800.74
 785     318471Hz     318181Hz  785.7  7 801.77
 786     318066Hz     317892Hz  786.4  7 802.79
 787     317662Hz     317316Hz  787.9  7 803.81
 788     317258Hz     317316Hz  787.9  7 804.84
 789     316856Hz     316455Hz  790.0  7 805.86
 790     316455Hz     316455Hz  790.0  7 806.89
 791     316055Hz     315599Hz  792.1  7 807.91
 792     315656Hz     315599Hz  792.1  7 808.93
 793     315258Hz     314748Hz  794.3  7 809.96
 794     314861Hz     315031Hz  793.6  7 810.98
 795     314465Hz     313901Hz  796.4  7 812.00
 796     314070Hz     313901Hz  796.4  7 813.03
 797     313676Hz     313339Hz  797.9  7 814.05
 798     313283Hz     313339Hz  797.9  7 815.08
 799     312891Hz     312500Hz  800.0  7 816.10
 800     312500Hz     312500Hz  800.0  7 817.12
 801     312109Hz     311942Hz  801.4  7 818.14
 802     311720Hz     311665Hz  802.1  7 819.17
 803     311332Hz     311111Hz  803.6  7 820.19
 804     310945Hz     311111Hz  803.6  7 821.21
 805     310559Hz     310283Hz  805.7  7 822.24
 806     310173Hz     310008Hz  806.4  7 823.26
 807     309789Hz     309460Hz  807.9  7 824.29
 808     309405Hz     309187Hz  808.6  7 825.31
 809     309023Hz     308641Hz  810.0  7 826.33
 810     308641Hz     308641Hz  810.0  7 827.36
 811     308261Hz     307827Hz  812.1  7 828.38
 812     307881Hz     308098Hz  811.4  7 829.40
 813     307503Hz     307017Hz  814.3  7 830.43
 814     307125Hz     307017Hz  814.3  7 831.45
 815     306748Hz     306479Hz  815.7  7 832.47
 816     306372Hz     306479Hz  815.7  7 833.50
 817     305997Hz     305410Hz  818.6  7 834.52
 818     305623Hz     305676Hz  817.9  7 835.55
 819     305250Hz     304878Hz  820.0  7 836.57
 820     304878Hz     304878Hz  820.0  7 837.59
 821     304506Hz     304083Hz  822.1  7 838.62
 822     304136Hz     304347Hz  821.4  7 839.64
 823     303766Hz     303292Hz  824.3  7 840.66
 824     303398Hz     303292Hz  824.3  7 841.69
 825     303030Hz     302768Hz  825.7  7 842.71
 826     302663Hz     302768Hz  825.7  7 843.74
 827     302297Hz     301724Hz  828.6  7 844.76
 828     301932Hz     301984Hz  827.9  7 845.79
 829     301568Hz     301204Hz  830.0  7 846.81
 830     301204Hz     301204Hz  830.0  7 847.83
 831     300842Hz     300429Hz  832.1  7 848.86
 832     300480Hz     300429Hz  832.1  7 849.88
 833     300120Hz     299657Hz  834.3  7 850.91
 834     299760Hz     299914Hz  833.6  7 851.93
 835     299401Hz     298889Hz  836.4  7 852.95
 836     299043Hz     299145Hz  835.7  7 853.98
 837     298685Hz     298380Hz  837.9  7 855.00
 838     298329Hz     298380Hz  837.9  7 856.02
 839     297973Hz     297619Hz  840.0  7 857.05
 840     297619Hz     297619Hz  840.0  7 858.07
 841     297265Hz     297113Hz  841.4  7 859.09
 842     296912Hz     296861Hz  842.1  7 860.12
 843     296559Hz     296108Hz  844.3  7 861.14
 844     296208Hz     296359Hz  843.6  7 862.17
 845     295857Hz     295608Hz  845.7  7 863.19
 846     295508Hz     295608Hz  845.7  7 864.21
 847     295159Hz     294860Hz  847.9  7 865.24
 848     294811Hz     294860Hz  847.9  7 866.26
 849     294464Hz     294117Hz  850.0  7 867.29
 850     294117Hz     294117Hz  850.0  7 868.31
 851     293772Hz     293378Hz  852.1  7 869.33
 852     293427Hz     293624Hz  851.4  7 870.36
 853     293083Hz     292887Hz  853.6  7 871.38
 854     292740Hz     292642Hz  854.3  7 872.41
 855     292397Hz     292153Hz  855.7  7 873.43
 856     292056Hz     292153Hz  855.7  7 874.45
 857     291715Hz     291423Hz  857.9  7 875.48
 858     291375Hz     291423Hz  857.9  7 876.50
 859     291036Hz     290697Hz  860.0  7 877.53
 860     290697Hz     290697Hz  860.0  7 878.55
 861     290360Hz     289975Hz  862.1  7 879.57
 862     290023Hz     289975Hz  862.1  7 880.60
 863     289687Hz     289256Hz  864.3  7 881.62
 864     289351Hz     289256Hz  864.3  7 882.64
 865     289017Hz     288540Hz  866.4  7 883.67
 866     288683Hz     288778Hz  865.7  7 884.69
 867     288350Hz     288065Hz  867.9  7 885.72
 868     288018Hz     288065Hz  867.9  7 886.74
 869     287686Hz     287356Hz  870.0  7 887.76
 870     287356Hz     287356Hz  870.0  7 888.79
 871     287026Hz     286650Hz  872.1  7 889.81
 872     286697Hz     286885Hz  871.4  7 890.84
 873     286368Hz     286181Hz  873.6  7 891.86
 874     286041Hz     285947Hz  874.3  7 892.88
 875     285714Hz     285481Hz  875.7  7 893.91
 876     285388Hz     285248Hz  876.4  7 894.93
 877     285062Hz     284784Hz  877.9  7 895.96
 878     284738Hz     284784Hz  877.9  7 896.98
 879     284414Hz     284090Hz  880.0  7 898.00
 880     284090Hz     284090Hz  880.0  7 899.03
 881     283768Hz     283400Hz  882.1  7 900.05
 882     283446Hz     283400Hz  882.1  7 901.08
 883     283125Hz     282714Hz  884.3  7 902.10
 884     282805Hz     282714Hz  884.3  7 903.12
 885     282485Hz     282258Hz  885.7  7 904.15
 886     282167Hz     282258Hz  885.7  7 905.17
 887     281848Hz     281576Hz  887.9  7 906.20
 888     281531Hz     281576Hz  887.9  7 907.22
 889     281214Hz     280898Hz  890.0  7 908.24
 890     280898Hz     280898Hz  890.0  7 909.27
 891     280583Hz     280224Hz  892.1  7 910.29
 892     280269Hz     280448Hz  891.4  7 911.32
 893     279955Hz     279552Hz  894.3  7 912.34
 894     279642Hz     279552Hz  894.3  7 913.36
 895     279329Hz     278884Hz  896.4  7 914.39
 896     279017Hz     279106Hz  895.7  7 915.41
 897     278706Hz     278440Hz  897.9  7 916.44
 898     278396Hz     278440Hz  897.9  7 917.46
 899     278086Hz     277777Hz  900.0  7 918.48
 900     277777Hz     277777Hz  900.0  7 919.51
 901     277469Hz     277117Hz  902.1  7 920.53
 902     277161Hz     277117Hz  902.1  7 921.56
 903     276854Hz     276461Hz  904.3  7 922.58
 904     276548Hz     276679Hz  903.6  7 923.60
 905     276243Hz     275807Hz  906.4  7 924.63
 906     275938Hz     275807Hz  906.4  7 925.65
 907     275633Hz     275157Hz  908.6  7 926.68
 908     275330Hz     275373Hz  907.9  7 927.70
 909     275027Hz     274725Hz  910.0  7 928.72
 910     274725Hz     274725Hz  910.0  7 929.75
 911     274423Hz     274079Hz  912.1  7 930.77
 912     274122Hz     274079Hz  912.1  7 931.80
 913     273822Hz     273437Hz  914.3  7 932.82
 914     273522Hz     273651Hz  913.6  7 933.85
 915     273224Hz     273010Hz  915.7  7 934.87
 916     272925Hz     273010Hz  915.7  7 935.89
 917     272628Hz     272373Hz  917.9  7 936.92
 918     272331Hz     272373Hz  917.9  7 937.94
 919     272034Hz     271739Hz  920.0  7 938.97
 920     271739Hz     271739Hz  920.0  7 939.99
 921     271444Hz     271107Hz  922.1  7 941.01
 922     271149Hz     271107Hz  922.1  7 942.04
 923     270855Hz     270479Hz  924.3  7 943.06
 924     270562Hz     270688Hz  923.6  7 944.09
 925     270270Hz     270061Hz  925.7  7 945.11
 926     269978Hz     270061Hz  925.7  7 946.13
 927     269687Hz     269438Hz  927.9  7 947.16
 928     269396Hz     269438Hz  927.9  7 948.18
 929     269106Hz     268817Hz  930.0  7 949.21
 930     268817Hz     268817Hz  930.0  7 950.23
 931     268528Hz     268199Hz  932.1  7 951.25
 932     268240Hz     268199Hz  932.1  7 952.28
 933     267952Hz     267584Hz  934.3  7 953.30
 934     267665Hz     267584Hz  934.3  7 954.33
 935     267379Hz     267175Hz  935.7  7 955.35
 936     267094Hz     266971Hz  936.4  7 956.38
 937     266808Hz     266362Hz  938.6  7 957.40
 938     266524Hz     266362Hz  938.6  7 958.42
 939     266240Hz     265957Hz  940.0  7 959.45
 940     265957Hz     265957Hz  940.0  7 960.47
 941     265674Hz     265352Hz  942.1  7 961.50
 942     265392Hz     265352Hz  942.1  7 962.52
 943     265111Hz     264950Hz  943.6  7 963.54
 944     264830Hz     264750Hz  944.3  7 964.57
 945     264550Hz     264350Hz  945.7  7 965.59
 946     264270Hz     264350Hz  945.7  7 966.62
 947     263991Hz     263554Hz  948.6  7 967.64
 948     263713Hz     263554Hz  948.6  7 968.66
 949     263435Hz     263157Hz  950.0  7 969.69
 950     263157Hz     263157Hz  950.0  7 970.71
 951     262881Hz     262762Hz  951.4  7 971.74
 952     262605Hz     262565Hz  952.1  7 972.76
 953     262329Hz     261976Hz  954.3  7 973.79
 954     262054Hz     261976Hz  954.3  7 974.81
 955     261780Hz     261584Hz  955.7  7 975.83
 956     261506Hz     261584Hz  955.7  7 976.86
 957     261233Hz     260999Hz  957.9  7 977.88
 958     260960Hz     260999Hz  957.9  7 978.91
 959     260688Hz     260416Hz  960.0  7 979.93
 960     260416Hz     260416Hz  960.0  7 980.95
 961     260145Hz     260029Hz  961.4  7 981.98
 962     259875Hz     259836Hz  962.1  7 983.00
 963     259605Hz     259259Hz  964.3  7 984.03
 964     259336Hz     259451Hz  963.6  7 985.05
 965     259067Hz     258875Hz  965.7  7 986.08
 966     258799Hz     258684Hz  966.4  7 987.10
 967     258531Hz     258302Hz  967.9  7 988.12
 968     258264Hz     258302Hz  967.9  7 989.15
 969     257997Hz     257731Hz  970.0  7 990.17
 970     257731Hz     257731Hz  970.0  7 991.20
 971     257466Hz     257163Hz  972.1  7 992.22
 972     257201Hz     257163Hz  972.1  7 993.25
 973     256937Hz     256598Hz  974.3  7 994.27
 974     256673Hz     256598Hz  974.3  7 995.29
 975     256410Hz     256035Hz  976.4  7 996.32
 976     256147Hz     256222Hz  975.7  7 997.34
 977     255885Hz     255661Hz  977.9  7 998.37
 978     255623Hz     255474Hz  978.6  7 999.39
 979     255362Hz     255102Hz  980.0  7 1000.41
 980     255102Hz     255102Hz  980.0  7 1001.44
 981     254841Hz     254730Hz  981.4  7 1002.46
 982     254582Hz     254730Hz  981.4  7 1003.49
 983     254323Hz     253991Hz  984.3  7 1004.51
 984     254065Hz     254175Hz  983.6  7 1005.54
 985     253807Hz     253623Hz  985.7  7 1006.56
 986     253549Hz     253623Hz  985.7  7 1007.58
 987     253292Hz     253073Hz  987.9  7 1008.61
 988     253036Hz     252890Hz  988.6  7 1009.63
 989     252780Hz     252525Hz  990.0  7 1010.66
 990     252525Hz     252525Hz  990.0  7 1011.68
 991     252270Hz     251979Hz  992.1  7 1012.70
 992     252016Hz     251979Hz  992.1  7 1013.73
 993     251762Hz     251436Hz  994.3  7 1014.75
 994     251509Hz     251436Hz  994.3  7 1015.78
 995     251256Hz     251076Hz  995.7  7 1016.80
 996     251004Hz     250896Hz  996.4  7 1017.83
 997     250752Hz     250536Hz  997.9  7 1018.85
 998     250501Hz     250536Hz  997.9  7 1019.87
 999     250250Hz     250000Hz 1000.0  7 1020.90
1000     250000Hz     249999Hz 1000.0  7 1021.92
1001     249750Hz     249643Hz 1001.4  7 1022.94
1002     249500Hz     249465Hz 1002.1  7 1023.97
1003     249252Hz     249110Hz 1003.6  7 1024.99
1004     249003Hz     249110Hz 1003.6  7 1026.01
1005     248756Hz     248403Hz 1006.4  7 1027.04
1006     248508Hz     248403Hz 1006.4  7 1028.06
1007     248262Hz     248051Hz 1007.9  7 1029.09
1008     248015Hz     248051Hz 1007.9  7 1030.11
1009     247770Hz     247524Hz 1010.0  7 1031.14
1010     247524Hz     247524Hz 1010.0  7 1032.16
1011     247279Hz     247000Hz 1012.1  7 1033.19
1012     247035Hz     247000Hz 1012.1  7 1034.21
1013     246791Hz     246478Hz 1014.3  7 1035.24
1014     246548Hz     246478Hz 1014.3  7 1036.26
1015     246305Hz     246132Hz 1015.7  7 1037.28
1016     246062Hz     246132Hz 1015.7  7 1038.31
1017     245821Hz     245614Hz 1017.9  7 1039.33
1018     245579Hz     245614Hz 1017.9  7 1040.36
1019     245338Hz     245098Hz 1020.0  7 1041.38
1020     245098Hz     245098Hz 1020.0  7 1042.41
1021     244857Hz     244584Hz 1022.1  7 1043.43
1022     244618Hz     244584Hz 1022.1  7 1044.46
1023     244379Hz     244242Hz 1023.6  7 1045.48
1024     244140Hz     244242Hz 1023.6  7 1046.50

@msperl
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msperl commented Feb 27, 2015

So we have not a Power of 2 but a multiple of 2 Rule!

@msperl
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msperl commented Feb 27, 2015

The data should be in the repo shortly.

Here how it was created:

seq 1 1 1024 | while read x; do F=$[250000000/$x];printf "%2i %10i\n" $x $F;./spi-test -D /dev/spidev0.1 -s $F 0  >/dev/null ; sleep 1; done

(Using: http://github.com/KnCMiner/spi-test.git as the test tool)

Here is how the data has been analyzed:

awk -F, 'BEGIN{N=1}function X(){FR=250000000;if (C>1)FR=(C)/(L-F);printf "%4i %10iHz %10iHz %6.1f %2i %6.2f\n", N,250000000/N,FR,250000000/FR,C,L;}{if (NR<2){next;}}/, 1$/{T=$1;if (T>L+0.5){X();C=-1;F=T;N+=1}L=T;C++;}END{X();}' images/spi-cdiv_1_to_1024.csv

@msperl
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msperl commented Feb 27, 2015

Implemented 5b853b4 with the "multiple of 2" divider approach

@msperl msperl closed this as completed Feb 27, 2015
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