QY-IMX6S Linux Function And Test Manual
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or not ?
②
.
Serial ports hardware and testing program node is corresponded
or not ?
③
.
Whether [ttymxc1,ttymxc2,ttymxc3,ttymxc4] node be set
correctly in [/dev] directory ?
⑤
.
The kernel configuration is selected or not ?
2.6.SPI Test
Mainboard extracts SPI interface (J5), total 3-ch chip selects, can be
externally connected to 3-ch SPI device.
3-channel SPI all use SPI common driver [spidev], driver realize the
basic operation of device’s data read and write. When using, write
application program according to external device’s time sequence.
Test Principle
：
Because of no external SPI peripheral connection, test program only
writes data testing to SPI interface. Test program will send a group data
every other 1 second. If short connect the spi receiving pin and
transmitting pin, interrupt in debugging ports, it will print this group data.
It also can be measured on the wave through oscilloscope. If relating to
