NG mode:The SPI sending interface always has a fixed delay of 1.5ms #684
Description
Checklist
- Checked the issue tracker for similar issues to ensure this is not a duplicate
- Read the documentation to confirm the issue is not addressed there and your configuration is set correctly
- Tested with the latest version to ensure the issue hasn't been fixed
How often does this bug occurs?
always
Expected behavior
spi communication speed cannot meet the expected requirements
Actual behavior (suspected bug)
Iperf cannot achieve the expected speed
Error logs or terminal output
Steps to reproduce the behavior
I tried adding some printing to the sending interface，before and afer spi_sync_transfer，I added printing information
I found that this interface always takes 1.5ms more than the theoretical time
When I set 30MHz, theoretical time is 0.4ms, the actual usage time is about 2ms
When I lower the speed, theoretically there will be an additional delay of 1.5ms
Is there a way to locate where this interface is affecting communication speed
Project release version
5.1.3
System architecture
Intel/AMD 64-bit (modern PC, older Mac)
Operating system
Linux
Operating system version
5.15.24
Shell
ZSH
Additional context
No response