7 Control gpio

V0.0.1

7.1 Histroy

2014-04-09, rayoslee, release V0.0.1

7.2 FAQ

How to control led using gpio (GPD0~GPD4) in S605-32 demo-kit?

# make menuconfig and go to Device Drivers > GPIO Support > /sys/class/gpio/… (sysfs interface), please enable it.
In S605-32 console(if kernel supported), go to /sys/class/gpio
Calculate gpio No.

GPD0's gpio No. is 32*3+0=96
GPD1's gpio No. is 32*3+1=97
ps: A=0, B=32, C=64, D=96, E=128..

Create gpio folder

   echo 96 > export  //GPD0, TCK
   echo 97 > export  //GPD1, TMS
   echo 98 > export  //GPD2, TDI
   echo 99 > export  //GPD3, TDO
   echo 100 > export //GPD4, TRST

On/Off gpio

echo high > gpio99/direction
echo low > gpio99/direction
ps: other commands, in, out, high, low

Add GPD0~GPD2 in sound/soc/w55fa93/w55fa93_pcm.c

In defaults, GPD3 and GPD4 have bees set ON.
You can add the sample code as below:
if (1)
1106         {
1107             outl(inl(REG_GPDFUN) & ~MF_GPD2, REG_GPDFUN);               
1108         outl(inl(REG_GPIOD_OMD) | (0x0006), REG_GPIOD_OMD);         
1109         outl(inl(REG_GPIOD_PUEN) | (0x0006), REG_GPIOD_PUEN);       
1110
1111     
1112         outl(inl(REG_GPDFUN) & ~MF_GPD1, REG_GPDFUN);
1113         outl(inl(REG_GPIOD_OMD) | (0x0004), REG_GPIOD_OMD);
1114         outl(inl(REG_GPIOD_PUEN) | (0x0004), REG_GPIOD_PUEN);       
1115 
1116 
1117         outl(inl(REG_GPDFUN) & ~MF_GPD0, REG_GPDFUN);              
1118         outl(inl(REG_GPIOD_OMD) | (0x0002), REG_GPIOD_OMD);         
1119         outl(inl(REG_GPIOD_PUEN) | (0x0002), REG_GPIOD_PUEN);       
1120     }