Hello, i’m trying to use some pins as gpio on GL-MT300N-V2 but i can’t use I2C_SCLK (gpio4) and I2C_SD (gpio5).
if i do:
echo 4 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio4/direction
echo 0 > /sys/class/gpio/gpio4/value
echo 1 > /sys/class/gpio/gpio4/value
there is no error, but using a multimeter/volt-meter the value never change.
using the same code to control leds (gpio 42,43,44) work (after you do rmmod leds-gpio).
With this code i can’t use gpio45 and 46 (rx1, tx1), again, no error but the value using a multimeter never change.
I can use rx1 and tx1 using /dev/ttyS1 and also use /dev/ttyS0 they just work.
if i use an oscilloscope i can see that the value change for a moment by doing echo AAAAAAA > /dev/ttyS1
for i2c I followed this guide:
now i’m trying this: insmod i2c-gpio-custom bus0=0,5,4
there is no error, not even in dmesg, but it just doesn’t work, the pin value never change.
do i need some other package??
i2cdetect doesn’t detect anything and it’s super fast (<1 second to finish the command)
i have tested this on two random gpio numbers and i2cdetect doesn’t detect anything but it’s quite slow (about 1 second per address).
-using i2c pins as i2c
-using rx1,tx1 as normal gpio: set output and manually set high/low.
on the official website there is a pinout:
while here there is a different one (for the gpio), this seems wrong:
i’m using this firmware (openwrt, not oem):
Hardware specifications say:
DIY Features UART, 4GPIOs, 3.3V; 5V power port
but they also say:
The pins on the left side can be actually used for Ethernet port or EMMC. They cannot be used as GPIO.
but i don’t get why i can’t use as normal gpio… if i can’t use as gpio i want to use them as i2c; in the pinout photo and printed on the board it say “I2C” so it should be possible…