2020-04-24 12:07 AM - last edited on 2025-04-30 11:02 AM by Andrew Neil
Hello!
I work with STM32F429 nucleo board.
I try to connect it to CC1125 by SPI.
The requirement of SCK rise time is less than 40ns.
I tried different SPI channels and SCK pins.
Typical SCK rise time of the board is about 50 ns.
How can I improve it?
2020-04-24 1:45 AM
Set the GPIO OSPEEDR register bits for the SPI pins.
See Table 58. I/O AC characteristics in the datasheet for possible values, and the description of GPIO port output speed register (GPIOx_OSPEEDR) in the reference manual.
2020-04-24 5:50 AM
50ns?
What kind of capacitive loading do you have on the pin? What are the speed/slew-rate setting, Show Code
What kind of scope probe are you using? Use a 10X probe, and a fast scope
