ECSPI2 external HW Loopback test in i.MX8MM EVK

[sreedhar_appala]

Hi,

I am working with IMX8M Mini EVK and yocto project build details:

Build Configuration:
BB_VERSION = "1.38.0"
BUILD_SYS = "x86_64-linux"
NATIVELSBSTRING = "ubuntu-16.04"
TARGET_SYS = "aarch64-poky-linux"
MACHINE = "imx8mmevk"
DISTRO = "fsl-imx-xwayland"
DISTRO_VERSION = "4.14-sumo"
TUNE_FEATURES = "aarch64"
TARGET_FPU = ""

I made the dts changes and menuconfig as sugegsted in the thread : test code for checking ECSPI2 on iMX8M Mini EVK 

I want to test the hw loopback : Can I short In the EXP_CN J1003 Pin 19 and Pin 21

and try running the testcode of SPI using mxc_spi_test1.out.

For testing hw loopback, apart from connecting the J1003 pin 19 and pin 21 together, any other hw care needs to take.

Regards,

Sreedhar

[igorpadykov · Accepted solution]

Hi Sreedhar

you are right, for loopback connecting J1003 pin 19 and pin 21 together
will be sufficient. No additional connections are needed.

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

[sreedhar_appala]

Thank you Igor.