全志R58平台的GPIO引脚控制

全志R58平台的GPIO引脚控制

2017/8/18 15:50

版本：V1.0

开发板：SC5806（全志R58平台）

SDK：android4.4.4

本文以GPIO引脚PD24为例，在开发板的背面。J18座子上，+5V旁边（可以用这个引脚来定位！）。

rootroot@cm-System-Product-Name:/home/wwt/vxiaoyu_s5k5eya/lichee/linux-3.4$ make ARCH=arm menuconfig

Device Drivers --->

-*- GPIO Support --->

[ ] /sys/class/gpio/... (sysfs interface)

修改为：

[*] /sys/class/gpio/... (sysfs interface)

rootroot@cm-System-Product-Name:/home/wwt/vxiaoyu_s5k5eya/lichee$ find . -name gpio.h

./linux-3.4/arch/arm/mach-sunxi/include/mach/gpio.h

W:\xiaoyu_s5k5eya\lichee\linux-3.4\arch\arm\mach-sunxi\include\mach\gpio.h

得知GPIO号：

#define SUNXI_PINCTRL "sunxi-pinctrl"

#define SUNXI_BANK_SIZE 32

#define SUNXI_PA_BASE 0

#define SUNXI_PB_BASE 32

#define SUNXI_PC_BASE 64

#define SUNXI_PD_BASE 96

#define SUNXI_PE_BASE 128

#define SUNXI_PF_BASE 160

#define SUNXI_PG_BASE 192

#define SUNXI_PH_BASE 224

#define SUNXI_PI_BASE 256

#define SUNXI_PJ_BASE 288

#define SUNXI_PK_BASE 320

#define SUNXI_PL_BASE 352

#define SUNXI_PM_BASE 384

#define SUNXI_PN_BASE 416

#define SUNXI_PO_BASE 448

#define AXP_PIN_BASE 1024

PD24的GPIO引脚号为：

96+24=120

在串口终端中的调试方法：

shell@octopus-f1:/ $

shell@octopus-f1:/ $ cd /sys/class/gpio/

shell@octopus-f1:/sys/class/gpio $ ll

--w------- root root 4096 1970-01-01 09:01 export

lrwxrwxrwx root root 1970-01-01 09:01 gpiochip0 -> ../../devices/platform/sunxi-pinctrl/gpio/gpiochip0

lrwxrwxrwx root root 1970-01-01 09:01 gpiochip1024 -> ../../devices/platform/axp-pinctrl/gpio/gpiochip1024

--w------- root root 4096 1970-01-01 09:01 unexport

shell@octopus-f1:/sys/class/gpio $

（必须su权限：）

shell@octopus-sc5806:/sys/class/gpio $

shell@octopus-sc5806:/sys/class/gpio $ echo 120 > export

/system/bin/sh: can't create export: Permission denied

1|shell@octopus-sc5806:/sys/class/gpio $

1|shell@octopus-sc5806:/sys/class/gpio $ su

shell@octopus-sc5806:/sys/class/gpio #

shell@octopus-sc5806:/sys/class/gpio # echo 120 > export

shell@octopus-sc5806:/sys/class/gpio # ll

--w------- root root 4096 1970-01-02 09:13 export

lrwxrwxrwx root root 1970-01-02 09:13 gpio120 -> ../../devices/platform/sunxi-pinctrl/gpio/gpio120

lrwxrwxrwx root root 1970-01-02 09:11 gpiochip0 -> ../../devices/platform/sunxi-pinctrl/gpio/gpiochip0

lrwxrwxrwx root root 1970-01-02 09:11 gpiochip1024 -> ../../devices/platform/axp-pinctrl/gpio/gpiochip1024

--w------- root root 4096 1970-01-02 09:11 unexport

shell@octopus-sc5806:/sys/class/gpio #

切换到DP24的目录：

shell@octopus-sc5806:/sys/class/gpio # cd gpio120/

shell@octopus-sc5806:/sys/class/gpio/gpio120 # ll

-rw-r--r-- root root 4096 1970-01-02 09:14 active_low

lrwxrwxrwx root root 1970-01-02 09:14 device -> ../../../sunxi-pinctrl

-rw-r--r-- root root 4096 1970-01-02 09:14 direction

drwxr-xr-x root root 1970-01-02 09:14 power

lrwxrwxrwx root root 1970-01-02 09:14 subsystem -> ../../../../../class/gpio

-rw-r--r-- root root 4096 1970-01-02 09:14 uevent

-rw-r--r-- root root 4096 1970-01-02 09:14 value