Odd, non-standard bit rates are occasionally useful when dealing with networks suffering from a large clock frequency error. The table below contains the full list of all bit rates that can be used with Zubax Babel and Babel-Babel.
zubax-babel-bitrates.tsv (64.2 KB)
The following excerpt shows bit rates above 100 kbit/s (the most commonly used ones):
| Bitrate | Sample point location |
|---|---|
| 100000 | 86.7% |
| 100840 | 88.2% |
| 101123 | 75.0% |
| 101408 | 80.0% |
| 101694 | 83.3% |
| 102272 | 87.5% |
| 102564 | 84.6% |
| 102857 | 85.7% |
| 103448 | 83.3% |
| 104347 | 86.7% |
| 104651 | 87.5% |
| 104956 | 85.7% |
| 105263 | 88.9% |
| 105571 | 81.8% |
| 105882 | 88.2% |
| 106194 | 66.7% |
| 106508 | 84.6% |
| 107142 | 87.5% |
| 107462 | 80.0% |
| 108108 | 88.9% |
| 108433 | 75.0% |
| 109090 | 86.7% |
| 109422 | 85.7% |
| 109756 | 87.5% |
| 110091 | 66.7% |
| 110769 | 84.6% |
| 111111 | 83.3% |
| 111455 | 88.2% |
| 111801 | 85.7% |
| 112149 | 66.7% |
| 112500 | 87.5% |
| 112852 | 81.8% |
| 113207 | 83.3% |
| 113924 | 75.0% |
| 114285 | 86.7% |
| 115384 | 84.6% |
| 116129 | 90.0% |
| 116504 | 66.7% |
| 116883 | 85.7% |
| 117647 | 88.2% |
| 118032 | 80.0% |
| 118421 | 87.5% |
| 118811 | 66.7% |
| 119601 | 85.7% |
| 120000 | 86.7% |
| 120401 | 84.6% |
| 121212 | 81.8% |
| 121621 | 87.5% |
| 122033 | 80.0% |
| 122448 | 85.7% |
| 123287 | 75.0% |
| 123711 | 66.7% |
| 124137 | 90.0% |
| 124567 | 88.2% |
| 125000 | 87.5% |
| 125435 | 85.7% |
| 125874 | 84.6% |
| 126315 | 86.7% |
| 126760 | 75.0% |
| 127659 | 83.3% |
| 128571 | 85.7% |
| 129032 | 88.9% |
| 130434 | 83.3% |
| 130909 | 81.8% |
| 131868 | 84.6% |
| 132352 | 88.2% |
| 133333 | 86.7% |
| 134328 | 75.0% |
| 134831 | 66.7% |
| 135338 | 85.7% |
| 135849 | 80.0% |
| 136363 | 83.3% |
| 137931 | 88.9% |
| 138461 | 84.6% |
| 138996 | 85.7% |
| 139534 | 83.3% |
| 140625 | 87.5% |
| 141176 | 88.2% |
| 142292 | 81.8% |
| 142857 | 85.7% |
| 144000 | 90.0% |
| 144578 | 66.7% |
| 145161 | 87.5% |
| 145748 | 84.6% |
| 146341 | 83.3% |
| 146938 | 85.7% |
| 147540 | 75.0% |
| 148148 | 88.9% |
| 148760 | 81.8% |
| 150000 | 87.5% |
| 151260 | 88.2% |
| 151898 | 66.7% |
| 152542 | 75.0% |
| 153191 | 80.0% |
| 153846 | 84.6% |
| 155172 | 87.5% |
| 155844 | 81.8% |
| 156521 | 90.0% |
| 157894 | 83.3% |
| 160000 | 86.7% |
| 160714 | 87.5% |
| 162162 | 83.3% |
| 162895 | 88.2% |
| 163636 | 81.8% |
| 164383 | 66.7% |
| 165898 | 85.7% |
| 166666 | 83.3% |
| 167441 | 80.0% |
| 169014 | 66.7% |
| 169811 | 75.0% |
| 171428 | 86.7% |
| 172248 | 81.8% |
| 173076 | 87.5% |
| 173913 | 88.9% |
| 175609 | 80.0% |
| 176470 | 88.2% |
| 177339 | 85.7% |
| 179104 | 66.7% |
| 180000 | 90.0% |
| 181818 | 81.8% |
| 183673 | 85.7% |
| 184615 | 86.7% |
| 187500 | 87.5% |
| 189473 | 90.0% |
| 190476 | 88.9% |
| 191489 | 75.0% |
| 192513 | 88.2% |
| 193548 | 83.3% |
| 194594 | 80.0% |
| 195652 | 87.5% |
| 196721 | 66.7% |
| 197802 | 85.7% |
| 200000 | 86.7% |
| 203389 | 66.7% |
| 204545 | 87.5% |
| 205714 | 85.7% |
| 206896 | 83.3% |
| 209302 | 75.0% |
| 210526 | 88.9% |
| 211764 | 88.2% |
| 213017 | 84.6% |
| 214285 | 85.7% |
| 218181 | 86.7% |
| 219512 | 75.0% |
| 222222 | 88.9% |
| 223602 | 85.7% |
| 225000 | 87.5% |
| 226415 | 66.7% |
| 230769 | 84.6% |
| 232258 | 80.0% |
| 233766 | 85.7% |
| 235294 | 88.2% |
| 236842 | 87.5% |
| 240000 | 86.7% |
| 243243 | 75.0% |
| 244897 | 85.7% |
| 248275 | 80.0% |
| 250000 | 87.5% |
| 251748 | 84.6% |
| 255319 | 66.7% |
| 257142 | 85.7% |
| 260869 | 83.3% |
| 264705 | 88.2% |
| 266666 | 86.7% |
| 270676 | 85.7% |
| 272727 | 83.3% |
| 276923 | 84.6% |
| 279069 | 66.7% |
| 281250 | 87.5% |
| 285714 | 85.7% |
| 288000 | 80.0% |
| 290322 | 75.0% |
| 292682 | 66.7% |
| 297520 | 81.8% |
| 300000 | 86.7% |
| 302521 | 88.2% |
| 307692 | 84.6% |
| 310344 | 75.0% |
| 313043 | 80.0% |
| 315789 | 83.3% |
| 321428 | 87.5% |
| 324324 | 66.7% |
| 327272 | 81.8% |
| 333333 | 83.3% |
| 342857 | 86.7% |
| 346153 | 84.6% |
| 352941 | 88.2% |
| 360000 | 90.0% |
| 363636 | 81.8% |
| 367346 | 85.7% |
| 375000 | 87.5% |
| 378947 | 80.0% |
| 387096 | 66.7% |
| 391304 | 75.0% |
| 395604 | 84.6% |
| 400000 | 86.7% |
| 409090 | 81.8% |
| 413793 | 66.7% |
| 423529 | 88.2% |
| 428571 | 85.7% |
| 444444 | 88.9% |
| 450000 | 87.5% |
| 461538 | 84.6% |
| 467532 | 81.8% |
| 473684 | 75.0% |
| 480000 | 86.7% |
| 500000 | 83.3% |
| 514285 | 85.7% |
| 521739 | 66.7% |
| 529411 | 88.2% |
| 545454 | 81.8% |
| 553846 | 84.6% |
| 562500 | 87.5% |
| 571428 | 88.9% |
| 600000 | 86.7% |
| 631578 | 66.7% |
| 642857 | 85.7% |
| 654545 | 81.8% |
| 666666 | 88.9% |
| 692307 | 84.6% |
| 705882 | 88.2% |
| 720000 | 90.0% |
| 734693 | 85.7% |
| 750000 | 87.5% |
| 800000 | 86.7% |
| 818181 | 81.8% |
| 857142 | 85.7% |
| 900000 | 90.0% |
| 923076 | 84.6% |
| 1000000 | 88.9% |
One method to connect to a CAN device with a large clock frequency bias is to use a logic analyzer to measure the actual bitrate and then pick the closest value from the table. Example measurement using Saleae Logic is shown on the screenshot:
The source code used to derive the table is attached. It is applicable to all devices based on the STMicroelectronics bxCAN macrocell or similar CAN controller implementations.
bxcan_timings.c++ (5.0 KB)