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A1H BSP GPIO pin setting issue

jomon
over 2 years ago
Currently i am trying to set the pins P4_4, P8_8 as gpio but getting the following problem
Using A1H rsk linux 4.9 bsp.
 
1) First exported and setted pin direction as out
echo 68 > /sys/class/gpio/export
echo out > /sys/class/gpio/P4_4/direction
 
2) changed value to the 1
echo 1 > /sys/class/gpio/P4_4/value
 
3) read value using cat command and got value  1
cat /sys/class/gpio/P4_4/value
 
4) changed value to the 0
echo 0 > /sys/class/gpio/P4_4/value
 
5) read the value using cat command but still got 1 the value is not changing
cat /sys/class/gpio/P4_4/value
 
Tried with multimeter also but not changing the value.
 
What will be the probelm with these pins. Is it any additional settings required.