Peripheral

Pinmux

1. List pin groups:

   mt7688_pinmux get
   

2. Reassign pin group:

   mt7688_pinmux set <group> <function>
   

SPI over GPIO

1. Install SPI-GPIO drivers:

   # opkg update
   # opkg install kmod-spi-gpio
   # opkg install kmod-spi-dev
   # opkg install kmod-spi-gpio-custom
   

2. Use mt7688_pinmux to make sure devoted pins are in GPIO state. Probably, reboot needed ???

2. Insert the module:

   insmod spi-gpio-custom bus<x=0...3>=<id>,<sck>,<mosi>,<miso>,<mode1>,<maxfreq1>,<cs1>
   

E.g.:

insmod spi-gpio-custom bus0=1,14,15,16,0,10000,17

Modes:

Mode#	CPOL	CPHA
0	0	0
1	0	1
2	1	0
3	1	1