CANedge2 Docs, Release FW 01.04.02
Bit-rate configuration mode
bit_rate_cfg_mode
Configures how the CAN bus bit-rate is set. Modes Auto-detect and Bit-rate support all standard bit-rates.
Non-standard bit-rate configuration can be set using Bit-timing. It is recommended to set the bit-rate
manually if it is known.
type:
integer
default:
0
options:
Auto-detect: [0] Bit-rate (simple): [1] Bit-timing
(advanced): [2]
Configuration explained
This section contains additional information and examples.
Bit-rate configuration
The input clock to the CAN-bus controllers is set to 40MHz (480MHz prescaled by 12).
Bit-rate modes
Auto-detect
and
Bit-rate (simple)
support the following list of bit-rates
Bitrate
BRP
Quanta
Seg1
Seg2
SJW
5k
100
80
63
16
4
10k
50
80
63
16
4
20k
25
80
63
16
4
33.333k
10
120
95
24
4
47.619k
8
105
83
21
4
50k
10
80
63
16
4
83.333k
4
120
95
24
4
95.238k
4
105
83
21
4
100k
5
80
63
16
4
125k
4
80
63
16
4
250k
2
80
63
16
4
500k
1
80
63
16
4
800k
1
50
39
10
4
1M
1
40
31
8
4
2M
1
20
15
4
4
4M
1
10
7
2
2
In
Auto-detect
mode, the device will attempt to determine the bit-rate from the list of detectable bit-
rates. Depending on factors such as data patterns, bit-rate deviation etc. it may not always be possible
to detect the bit-rate automatically.
Warning:
It is recommended to set the bit-rate manually when possible
Warning:
Bit-rate auto-detect cannot be used to detect a CAN FD switched bit-rate
In mode
Bit-timing (advanced)
, the bit-rate timing can be set directly. The following equations can
be used to calculate the bit-timing fields:
• Input clock:
𝐶𝐿𝐾
=
480000000
12
= 40000000 = 40MHz
• Quanta:
𝑄
= 1 +
𝑆𝐸𝐺
1
+
𝑆𝐸𝐺
2
1
All bit-rate configurations use a sample point (SP) of 80%
0.4. Configuration
23
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