展讯-GPIO操作

1.修改IO配置

以GPIO92为例

IO配置文件在：

bsp/kernel/kernel4.14/arch/arm64/boot/dts/sprd/uis8581e5h10.dts
bsp/bootloader/u-boot15/board/spreadtrum/uis8581e5h10/pinmap-sp9863a.c

配置

按上述内容，配置IO口

编译之前查看硬件GPIO，没有GPIO92

cat d/gpio

编译

2.ADB操作GPIO

adb shell
su
echo 284 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio284/direction
cat d/gpio

查看

echo 1 > /sys/class/gpio/gpio284/value

输出高电平

实测正常

3.安卓源码下C文件编译

创建文件夹及相关文件

test/Android.mk

LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
 
LOCAL_STATIC_LIBRARIES := libcutils libc
LOCAL_MODULE :=   gpiotest
 
LOCAL_FORCE_STATIC_EXECUTABLE := true
LOCAL_SRC_FILES:= \
         gpiotest.c
 
LOCAL_C_INCLUDES := bionic/libc/bionic
 
ifeq ($(HAVE_SELINUX),true)
LOCAL_CFLAGS += -DHAVE_SELINUX
LOCAL_SHARED_LIBRARIES += libselinux
LOCAL_C_INCLUDES += external/libselinux/include
endif
 
include $(BUILD_EXECUTABLE)

test/gpiotest.c

#include<stdio.h>

int main()
{
    printf("Hello World!\n");
}

进入目录angleyes/test，编译

cp -rf vendor/sprd/release/IDH/uis8581e5h10_Natv-userdebug-native/out/ .
cp -rf vendor/sprd/release/IDH/uis8581e5h10_Natv-userdebug-native/bsp/ .
source build/envsetup.sh
lunch uis8581e5h10_Natv-userdebug-native
mm

找到输出目录

上传到设备上

adb root
adb disable-verity
adb reboot
adb root
adb remount
adb shell
mount -o rw,remount /system
exit
adb push gpiotest /system

测试代码

chmod a+x gpiotest
./gpiotest

4.通过源码控制GPIO

将上部分的c文件修改一下

#include <stdio.h>
#include <string.h>
#include <fcntl.h>// for open
#include <unistd.h>// for close

int main()
{
    int ret, fd; 
    fd = open("/sys/class/gpio/export", O_WRONLY); 
    if (fd < 0) 
    return -1; 
    ret = write(fd, "284", strlen("284")); if (ret < 0) 
    return -1; 
    close(fd); 
    fd = open("/sys/class/gpio/gpio284/direction", O_RDWR); 
    if (fd < 0)
    return -1; 
    ret = write(fd, "out", strlen("out")); 
    if (ret < 0) 
    return -1; 
    close(fd); 
    fd = open("/sys/class/gpio/gpio284/value", O_RDWR); 
    if (fd < 0) 
    return -1;
    ret = write(fd, "1", strlen("1")); 
    if (ret < 0)
    return -1; 
    close(fd);
}

测试

uis8581e5h10:/system # chmod a+x gpiotest
uis8581e5h10:/system # ls /sys/class/gpio/
export  gpio218 gpiochip176 gpiochip448 gpiochip480 unexport
gpio217 gpio268 gpiochip192 gpiochip464 gpiochip496
uis8581e5h10:/system # ./gpiotest
uis8581e5h10:/system # ls /sys/class/gpio/
export  gpio218 gpio284     gpiochip192 gpiochip464 gpiochip496
gpio217 gpio268 gpiochip176 gpiochip448 gpiochip480 unexport
uis8581e5h10:/system #

5.按键功能调试

设备树位置：bsp/kernel/kernel4.14/arch/arm64/boot/dts/sprd/uis8581e5h10.dts

修改节点：gpio-keys

如新增sos按键

key-sos {
			label = "SOS Key";
			linux,code = <KEY_F1>;
			gpios = <&ap_gpio 55 GPIO_ACTIVE_LOW>;
			debounce-interval = <2>;
			wakeup-source;
		};

在内核层查看

cat /sys/kernel/debug/gpio