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= '''GPIO输出和输入(GPIO output & input)''' =
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<div>
 +
 
 +
= '''GPIO输出和输入''' =
 
GPIO输入输出以SD1_CLK管脚为例。<br>
 
GPIO输入输出以SD1_CLK管脚为例。<br>
<span style="background:#CCCCCC">GPIO output & input take SD1_CLK leads as an example。</span><br>
 
  
== '''修改.h文件(modification “.h” file)''' ==
+
== '''修改.h文件''' ==
 
1)检查头文件中对SD1_CLK的配置<br>
 
1)检查头文件中对SD1_CLK的配置<br>
<span style="background:#CCCCCC">check configuration for SD1_CLK in file)</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ sed -n "/PAD_SD1_CLK/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -n "/PAD_SD1_CLK/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
<br>
 
<br>
 
2)注释头文件中对SD1_CLK的配置<br>
 
2)注释头文件中对SD1_CLK的配置<br>
<span style="background:#CCCCCC">configuration for SD1_CLK in comment header file</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ sed -i "s/MX6Q_PAD_SD1_CLK/\/\/ &/g" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -i "s/MX6Q_PAD_SD1_CLK/\/\/ &/g" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
<br>
 
<br>
 
3)在mx6q_sabresd_pads中添加对SD1_CLK的配置<br>
 
3)在mx6q_sabresd_pads中添加对SD1_CLK的配置<br>
<span style="background:#CCCCCC">adding configuration for SD1_CLK in mx6q_sabresd_pads</span><br>
 
 
配置SD1_CLK功能为MX6Q_PAD_SD1_CLK__GPIO_1_20<br>
 
配置SD1_CLK功能为MX6Q_PAD_SD1_CLK__GPIO_1_20<br>
<span style="background:#CCCCCC">configure SD1_CLK function as MX6Q_PAD_SD1_CLK__GPIO_1_20</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ sed -i "/mx6q_sabresd_pads/a\\\t MX6Q_PAD_SD1_CLK__GPIO_1_20," \<br>
 
$ sed -i "/mx6q_sabresd_pads/a\\\t MX6Q_PAD_SD1_CLK__GPIO_1_20," \<br>
 
arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
<br>
 
<br>
 
4)查看修改结果<br>
 
4)查看修改结果<br>
<span style="background:#CCCCCC">check modified result</span><br>
+
示例如下:<br>
 
 
示例如下(example):<br>
 
 
$ sed -n "/PAD_SD1_CLK/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -n "/PAD_SD1_CLK/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
  
  
== '''配置内核(configure kernel)''' ==
+
== '''配置内核''' ==
*菜单定位(mamu position)<br>
+
*菜单定位<br>
 
Device Drivers  --->  -*- GPIO Support  --->  [*]  /sys/class/gpio/... (sysfs interface)<br>
 
Device Drivers  --->  -*- GPIO Support  --->  [*]  /sys/class/gpio/... (sysfs interface)<br>
 
[[文件:my_imx6_gpio_1.2.0.1.jpg]]<br>
 
[[文件:my_imx6_gpio_1.2.0.1.jpg]]<br>
  
  
== '''编译(compilation)''' ==
+
== '''编译''' ==
 
make uImage<br>
 
make uImage<br>
== '''重新烧写系统并启动(re-program system and boot)''' ==
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== '''重新烧写系统并启动''' ==
== '''设备操作(device operation)''' ==
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== '''设备操作''' ==
  
=== 查看gpio目录(check out gpio directory) ===
+
=== 查看gpio目录 ===
 
在/sys/class/gpio/目录下可以看到已经导出的GPIO<br>
 
在/sys/class/gpio/目录下可以看到已经导出的GPIO<br>
<span style="background:#CCCCCC">GPIO led out can bee seen under /sys/class/gpio/ directory</span><br>
 
 
$ ls /sys/class/gpio/<br>
 
$ ls /sys/class/gpio/<br>
 
<br>
 
<br>
第48行: 第42行:
 
<br>
 
<br>
  
=== 向系统注册GPIO(register GPIO to system) ===
+
=== 向系统注册GPIO ===
 
  使用echo注册GPIO_1_20到系统,即可看到gpio目录下多出一个gpio20目录。<br>
 
  使用echo注册GPIO_1_20到系统,即可看到gpio目录下多出一个gpio20目录。<br>
  <span style="background:#CCCCCC">register GPIO_1_20 to system with echo,then an extra gpio20 directory can be found under gpio directory。</span><br>
 
 
  提示:I.MX6 GPIO的值计算方法是(所在的组 - 1) * 32 + 序号,所以GPIO_1_20的管脚值为 (1 – 1) * 32 + 20 = 20。<br>
 
  提示:I.MX6 GPIO的值计算方法是(所在的组 - 1) * 32 + 序号,所以GPIO_1_20的管脚值为 (1 – 1) * 32 + 20 = 20。<br>
  <span style="background:#CCCCCC">tips:I.MX6 GPIO value is calculation this way(where grouped - 1) * 32 + order number,so lead number of GPIO_1_20 is(1 – 1) * 32 + 20 = 20。</span><br>
 
 
$ echo 20 > /sys/class/gpio/export<br>
 
$ echo 20 > /sys/class/gpio/export<br>
 
<br>
 
<br>
第58行: 第50行:
 
<br>
 
<br>
  
=== GPIO输出控制(GPIO output control) ===
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=== GPIO输出控制 ===
 
*设置管脚为输出状态
 
*设置管脚为输出状态
<span style="background:#CCCCCC">set leads as output state</span><br>
 
 
$ echo out > /sys/class/gpio/gpio20/direction<br>
 
$ echo out > /sys/class/gpio/gpio20/direction<br>
 
*设置管脚为输出为高电平
 
*设置管脚为输出为高电平
<span style="background:#CCCCCC">set lead output at high electrical level</span><br>
 
 
echo 1 > /sys/class/gpio/gpio20/value<br>
 
echo 1 > /sys/class/gpio/gpio20/value<br>
 
*设置管脚为输出为低电平
 
*设置管脚为输出为低电平
<span style="background:#CCCCCC">set lead output at low electrical level</span><br>
 
 
echo 0 > /sys/class/gpio/gpio20/value<br>
 
echo 0 > /sys/class/gpio/gpio20/value<br>
  
=== GPIO输入设置(set lead as input state) ===
+
=== GPIO输入设置 ===
 
*设置管脚为输入状态
 
*设置管脚为输入状态
<span style="background:#CCCCCC">set lead as input state</span><br>
 
 
echo in > /sys/class/gpio/gpio20/direction<br>
 
echo in > /sys/class/gpio/gpio20/direction<br>
 
*获取输入值<br>
 
*获取输入值<br>
<span style="background:#CCCCCC">gain lead value</span><br>
 
 
cat /sys/class/gpio/gpio20/value<br>
 
cat /sys/class/gpio/gpio20/value<br>
  
=== 注销GPIO接口(logout GPIO interface) ===
+
=== 注销GPIO接口 ===
 
*注销GPIO_1_20
 
*注销GPIO_1_20
<span style="background:#CCCCCC">logout GPIO_1_20</span><br>
 
 
echo 20 > /sys/class/gpio/unexport<br>
 
echo 20 > /sys/class/gpio/unexport<br>
 
= '''GPIO LED''' =
 
= '''GPIO LED''' =
 
----
 
----
 
说明:GPIO LED以PAD NANDF_CS0为例。<br>
 
说明:GPIO LED以PAD NANDF_CS0为例。<br>
<span style="background:#CCCCCC">instruction:take GPIO LED以PAD NANDF_CS0 as example。</span><br>
 
  
== '''进入内核目录(enter kernel directory)''' ==
+
== '''进入内核目录''' ==
 
$ cd ~/MY-I.MX6/linux-3.0.35/<br>
 
$ cd ~/MY-I.MX6/linux-3.0.35/<br>
 
[[文件:my_imx6_gpio_2.1.0.1.jpg]]<br>
 
[[文件:my_imx6_gpio_2.1.0.1.jpg]]<br>
  
== '''添加代码(add code)''' ==
+
== '''添加代码''' ==
=== 修改.h文件(modification.h file) ===
+
=== 修改.h文件 ===
 
1)查找头文件中对NANDF_CS0的配置<br>
 
1)查找头文件中对NANDF_CS0的配置<br>
<span style="background:#CCCCCC">check out configuration for NANDF_CS0 in header file.</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ sed -n "/PAD_NANDF_CS0/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -n "/PAD_NANDF_CS0/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
<br>
 
<br>
 
2)注释头文件中对NANDF_CS0的配置<br>
 
2)注释头文件中对NANDF_CS0的配置<br>
<span style="background:#CCCCCC">comment configuration for NANDF_CS0 in header file.</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ sed -i "s/MX6Q_PAD_NANDF_CS0/\/\/ &/g" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -i "s/MX6Q_PAD_NANDF_CS0/\/\/ &/g" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
<br>
 
<br>
 
3)在mx6q_sabresd_pads中添加对NANDF_CS0的配置<br>
 
3)在mx6q_sabresd_pads中添加对NANDF_CS0的配置<br>
<span style="background:#CCCCCC">add configuration for NANDF_CS0 in mx6q_sabresd_pads.</span><br>
 
 
配置NANDF_CS0功能为MX6Q_PAD_NANDF_CS0__GPIO_6_11<br>
 
配置NANDF_CS0功能为MX6Q_PAD_NANDF_CS0__GPIO_6_11<br>
<span style="background:#CCCCCC">configure NANDF_CS0 function as MX6Q_PAD_NANDF_CS0__GPIO_6_11.</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ sed -i "/mx6q_sabresd_pads/a\\\tMX6Q_PAD_NANDF_CS0__GPIO_6_11," arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -i "/mx6q_sabresd_pads/a\\\tMX6Q_PAD_NANDF_CS0__GPIO_6_11," arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
<br>
 
<br>
  
 
4)查看修改结果<br>
 
4)查看修改结果<br>
<span style="background:#CCCCCC">check out modified result.</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ sed -n "/PAD_NANDF_CS0/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -n "/PAD_NANDF_CS0/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
  
  
=== 修改.c文件(modification.c file) ===
+
=== 修改.c文件 ===
 
1)检查.c文件中GPIO是否被重复使用<br>
 
1)检查.c文件中GPIO是否被重复使用<br>
<span style="background:#CCCCCC">check out whether GPIO is used repeatedly in .c file</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ sed -n '/IMX_GPIO_NR(6,.11)/p' arch/arm/mach-mx6/board-mx6q_sabresd.c<br>
 
$ sed -n '/IMX_GPIO_NR(6,.11)/p' arch/arm/mach-mx6/board-mx6q_sabresd.c<br>
 
<br>
 
<br>
 
2)在.c文件中增加GPIO的宏定义<br>
 
2)在.c文件中增加GPIO的宏定义<br>
<span style="background:#CCCCCC">add macro definition of GPIOin .c file</span><br>
 
 
增加#define SABRESD_USER_LED        IMX_GPIO_NR(6, 11)<br>
 
增加#define SABRESD_USER_LED        IMX_GPIO_NR(6, 11)<br>
<span style="background:#CCCCCC">add #define SABRESD_USER_LED        IMX_GPIO_NR(6, 11)</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ GPIO_DEFINE="#define SABRESD_USER_LED\tIMX_GPIO_NR(6, 11)"<br>
 
$ GPIO_DEFINE="#define SABRESD_USER_LED\tIMX_GPIO_NR(6, 11)"<br>
 
$ sed -i "1,/#define/{/#define/s/#define/${GPIO_DEFINE}\n&/}" arch/arm/mach-mx6/board-mx6q_sabresd.c<br>
 
$ sed -i "1,/#define/{/#define/s/#define/${GPIO_DEFINE}\n&/}" arch/arm/mach-mx6/board-mx6q_sabresd.c<br>
 
<br>
 
<br>
 
2)检查gpio_led类型的数据定义<br>
 
2)检查gpio_led类型的数据定义<br>
<span style="background:#CCCCCC">check out data definition with gpio_led</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ sed -n '/struct gpio_led /,/\}/p' arch/arm/mach-mx6/board-mx6q_sabresd.c<br>
 
$ sed -n '/struct gpio_led /,/\}/p' arch/arm/mach-mx6/board-mx6q_sabresd.c<br>
 
<br>
 
<br>
 
3)增加user_led的数据定义<br>
 
3)增加user_led的数据定义<br>
<span style="background:#CCCCCC">add data definition of user_led</span><br>
 
 
static struct gpio_led imx6q_gpio_leds[] = {<br>
 
static struct gpio_led imx6q_gpio_leds[] = {<br>
 
    GPIO_LED(SABRESD_USER_LED, "user_led", 0, 1,<br>
 
    GPIO_LED(SABRESD_USER_LED, "user_led", 0, 1,<br>
第142行: 第117行:
 
};<br>
 
};<br>
  
== '''内核配置(kernel configuration)''' ==
+
== '''内核配置''' ==
*菜单定位(manu position) <br>
+
*菜单定位 <br>
 
Device Drivers  --->  [*] LED Support  --->  <*>  LED Support for GPIO connected LEDs<br>
 
Device Drivers  --->  [*] LED Support  --->  <*>  LED Support for GPIO connected LEDs<br>
 
[[文件:my_imx6_gpio_2.3.0.1.jpg]]<br>
 
[[文件:my_imx6_gpio_2.3.0.1.jpg]]<br>
  
== '''编译(compilation)''' ==
+
== '''编译''' ==
 
make uImage<br>
 
make uImage<br>
== '''重新烧写系统并启动(re-program system and boot)''' ==
+
== '''重新烧写系统并启动''' ==
== '''GPIO_LED操作(GPIO_LED operation)''' ==
+
== '''GPIO_LED操作''' ==
=== 设备文件目录(device file directory) ===
+
=== 设备文件目录 ===
 
启动系统后即存在/sys/class/leds/user_led目录,使用ls即可看到<br>
 
启动系统后即存在/sys/class/leds/user_led目录,使用ls即可看到<br>
<span style="background:#CCCCCC">to be saved under /sys/class/leds/user_led directory after booting system,which can be seen with ls.</span><br>
 
 
$ ls /sys/class/leds/user_led<br>
 
$ ls /sys/class/leds/user_led<br>
 
<br>
 
<br>
第159行: 第133行:
 
<br>
 
<br>
  
=== 操作示例(operating example) ===
+
=== 操作示例 ===
1)置NANDF_CS0为1(set NANDF_CS0 as 1)<br>
+
1)置NANDF_CS0为1<br>
 
$ echo 1 > /sys/class/leds/user_led/brightness<br>
 
$ echo 1 > /sys/class/leds/user_led/brightness<br>
2)置NANDF_CS0为0(set NANDF_CS0 as 0)<br>
+
2)置NANDF_CS0为0<br>
 
$ echo 0 > /sys/class/leds/user_led/brightness<br>
 
$ echo 0 > /sys/class/leds/user_led/brightness<br>
  
= '''GPIO按键(GPIO key)''' =
+
= '''GPIO按键''' =
 
----
 
----
 
GPIO按键以GPIO_4、EIM_BCLK、CSI0_DATA_EN为例,分别是原理图的按键SW2,SW3和SW4。<br>
 
GPIO按键以GPIO_4、EIM_BCLK、CSI0_DATA_EN为例,分别是原理图的按键SW2,SW3和SW4。<br>
<span style="background:#CCCCCC">GPIO key by taking GPIO_4、EIM_BCLK、CSI0_DATA_EN as example,are separetely SW2,SW3和SW4 in schematic。</span><br>
 
  
== '''修改.h文件(modification.h file)''' ==
+
== '''修改.h文件''' ==
 
1)查找头文件中对PAD的配置<br>
 
1)查找头文件中对PAD的配置<br>
<span style="background:#CCCCCC">check out configuration for PAD in header file.</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ sed -n "/PAD_GPIO_4/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -n "/PAD_GPIO_4/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -n "/PAD_EIM_BCLK/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -n "/PAD_EIM_BCLK/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
第179行: 第151行:
 
<br>
 
<br>
 
2)注释头文件中对PAD的配置<br>
 
2)注释头文件中对PAD的配置<br>
<span style="background:#CCCCCC">comment configuration for PAD in header file.</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ sed -i "s/MX6Q_PAD_GPIO_4/\/\/ &/g" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -i "s/MX6Q_PAD_GPIO_4/\/\/ &/g" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -i "s/MX6Q_PAD_EIM_BCLK/\/\/ &/g" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -i "s/MX6Q_PAD_EIM_BCLK/\/\/ &/g" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
第186行: 第157行:
 
<br>
 
<br>
 
3)在mx6q_sabresd_pads中添加对PAD的配置<br>
 
3)在mx6q_sabresd_pads中添加对PAD的配置<br>
<span style="background:#CCCCCC">add configuration for PAD in mx6q_sabresd_pads.</span><br>
 
 
配置GPIO_4功能为MX6Q_PAD_GPIO_4__GPIO_1_4<br>
 
配置GPIO_4功能为MX6Q_PAD_GPIO_4__GPIO_1_4<br>
<span style="background:#CCCCCC">configure GPIO_4 function as MX6Q_PAD_GPIO_4__GPIO_1_4.</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ sed -i "/mx6q_sabresd_pads/a\\\tMX6Q_PAD_GPIO_4__GPIO_1_4," arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -i "/mx6q_sabresd_pads/a\\\tMX6Q_PAD_GPIO_4__GPIO_1_4," arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
配置EIM_BCLK功能为MX6Q_PAD_EIM_BCLK__GPIO_6_31<br>
 
配置EIM_BCLK功能为MX6Q_PAD_EIM_BCLK__GPIO_6_31<br>
<span style="background:#CCCCCC">configure EIM_BCLK function as MX6Q_PAD_EIM_BCLK__GPIO_6_31.</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ sed -i "/mx6q_sabresd_pads/a\\\tMX6Q_PAD_EIM_BCLK__GPIO_6_31," arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -i "/mx6q_sabresd_pads/a\\\tMX6Q_PAD_EIM_BCLK__GPIO_6_31," arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
配置CSI0_DATA_EN的PAD功能为MX6Q_PAD_CSI0_DATA_EN__GPIO_5_20<br>
 
配置CSI0_DATA_EN的PAD功能为MX6Q_PAD_CSI0_DATA_EN__GPIO_5_20<br>
<span style="background:#CCCCCC">configrue PAD function of CSI0_DATA_EN as MX6Q_PAD_CSI0_DATA_EN__GPIO_5_20.</span><br>
 
 
示例如下:<br>
 
示例如下:<br>
 
$ sed -i "/mx6q_sabresd_pads/a\\\tMX6Q_PAD_CSI0_DATA_EN__GPIO_5_20," arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -i "/mx6q_sabresd_pads/a\\\tMX6Q_PAD_CSI0_DATA_EN__GPIO_5_20," arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
<br>
 
<br>
 
4)查看修改结果<br>
 
4)查看修改结果<br>
<span style="background:#CCCCCC">check out modified result</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ sed -n "/PAD_GPIO_4/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -n "/PAD_GPIO_4/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -n "/PAD_EIM_BCLK/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -n "/PAD_EIM_BCLK/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -n "/PAD_CSI0_DATA_EN/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
 
$ sed -n "/PAD_CSI0_DATA_EN/p" arch/arm/mach-mx6/board-mx6q_sabresd.h<br>
  
== '''修改.c文件(modification.c file)''' ==
+
== '''修改.c文件''' ==
 
1)检查.c文件中GPIO是否被重复使用<br>
 
1)检查.c文件中GPIO是否被重复使用<br>
<span style="background:#CCCCCC">check out whether GPIO is used repeatedly in .c file.</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ sed -n '/IMX_GPIO_NR(1,.4)/p' arch/arm/mach-mx6/board-mx6q_sabresd.c<br>
 
$ sed -n '/IMX_GPIO_NR(1,.4)/p' arch/arm/mach-mx6/board-mx6q_sabresd.c<br>
 
$ sed -n '/IMX_GPIO_NR(6,.31)/p' arch/arm/mach-mx6/board-mx6q_sabresd.c<br>
 
$ sed -n '/IMX_GPIO_NR(6,.31)/p' arch/arm/mach-mx6/board-mx6q_sabresd.c<br>
第216行: 第181行:
 
<br>
 
<br>
 
2)在.c文件中增加GPIO的宏定义<br>
 
2)在.c文件中增加GPIO的宏定义<br>
<span style="background:#CCCCCC">add macro definition of GPIO in .c file.</span><br>
 
 
*MX6Q_PAD_GPIO_4__GPIO_1_4<br>
 
*MX6Q_PAD_GPIO_4__GPIO_1_4<br>
 
在.c文件中添加#define SABRESD_POWER_OFF    IMX_GPIO_NR(1, 4)<br>
 
在.c文件中添加#define SABRESD_POWER_OFF    IMX_GPIO_NR(1, 4)<br>
<span style="background:#CCCCCC">in .c file add #define SABRESD_POWER_OFF    IMX_GPIO_NR(1, 4))</span><br>
 
 
示例如下:<br>
 
示例如下:<br>
 
$ GPIO_DEFINE="#define SABRESD_POWER_OFF\tIMX_GPIO_NR(1, 4)"<br>
 
$ GPIO_DEFINE="#define SABRESD_POWER_OFF\tIMX_GPIO_NR(1, 4)"<br>
第225行: 第188行:
 
*MX6Q_PAD_CSI0_DATA_EN__GPIO_5_20<br>
 
*MX6Q_PAD_CSI0_DATA_EN__GPIO_5_20<br>
 
在.c文件中添加#define SABRESD_VOLUME_UP  IMX_GPIO_NR(6, 31)<br>
 
在.c文件中添加#define SABRESD_VOLUME_UP  IMX_GPIO_NR(6, 31)<br>
<span style="background:#CCCCCC">in .c file add #define SABRESD_VOLUME_UP  IMX_GPIO_NR(6, 31))</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ GPIO_DEFINE="#define SABRESD_VOLUME_UP\tIMX_GPIO_NR(6, 31)"<br>
 
$ GPIO_DEFINE="#define SABRESD_VOLUME_UP\tIMX_GPIO_NR(6, 31)"<br>
 
$ sed -i "1,/#define/{/#define/s/#define/${GPIO_DEFINE}\n&/}" arch/arm/mach-mx6/board-mx6q_sabresd.c<br>
 
$ sed -i "1,/#define/{/#define/s/#define/${GPIO_DEFINE}\n&/}" arch/arm/mach-mx6/board-mx6q_sabresd.c<br>
 
*MX6Q_PAD_CSI0_DATA_EN__GPIO_5_20<br>
 
*MX6Q_PAD_CSI0_DATA_EN__GPIO_5_20<br>
 
在.c文件中添加#define SABRESD_VOLUME_DN  IMX_GPIO_NR(5, 20)<br>
 
在.c文件中添加#define SABRESD_VOLUME_DN  IMX_GPIO_NR(5, 20)<br>
<span style="background:#CCCCCC">in .c file add #define SABRESD_VOLUME_DN  IMX_GPIO_NR(5, 20))</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ GPIO_DEFINE="#define SABRESD_VOLUME_DN\tIMX_GPIO_NR(5, 20)"<br>
 
$ GPIO_DEFINE="#define SABRESD_VOLUME_DN\tIMX_GPIO_NR(5, 20)"<br>
 
$ sed -i "1,/#define/{/#define/s/#define/${GPIO_DEFINE}\n&/}" arch/arm/mach-mx6/board-mx6q_sabresd.c<br>
 
$ sed -i "1,/#define/{/#define/s/#define/${GPIO_DEFINE}\n&/}" arch/arm/mach-mx6/board-mx6q_sabresd.c<br>
 
<br>
 
<br>
 
3)检查gpio_keys_button类型的数据定义<br>
 
3)检查gpio_keys_button类型的数据定义<br>
<span style="background:#CCCCCC">chech out data definition with gpio_keys_button.</span><br>
+
示例如下:<br>
示例如下(example):<br>
 
 
$ sed -n '/gpio_keys_button/,/\}/p' arch/arm/mach-mx6/board-mx6q_sabresd.c<br>
 
$ sed -n '/gpio_keys_button/,/\}/p' arch/arm/mach-mx6/board-mx6q_sabresd.c<br>
 
<br>
 
<br>
 
4)增加volume-up、volume-down、power的数据定义<br>
 
4)增加volume-up、volume-down、power的数据定义<br>
<span style="background:#CCCCCC">add data definition for volume-up、volume-down、power.</span><br>
 
 
static struct gpio_keys_button imx6q_buttons[] = {<br>
 
static struct gpio_keys_button imx6q_buttons[] = {<br>
 
GPIO_BUTTON(SABRESD_VOLUME_UP, KEY_VOLUMEUP, 1, "volume-up", 0, 1),<br>
 
GPIO_BUTTON(SABRESD_VOLUME_UP, KEY_VOLUMEUP, 1, "volume-up", 0, 1),<br>
第249行: 第208行:
 
};<br>
 
};<br>
  
== '''内核配置(kernel configuration)''' ==
+
== '''内核配置''' ==
*菜单定位(manu position):<br>
+
*菜单定位:<br>
 
Device Drivers  --->  Input device support  --->  [*]  Keyboards  --->  <*>  GPIO Buttons<br>
 
Device Drivers  --->  Input device support  --->  [*]  Keyboards  --->  <*>  GPIO Buttons<br>
 
[[文件:my_imx6_gpio_3.2.0.1.jpg]]<br>
 
[[文件:my_imx6_gpio_3.2.0.1.jpg]]<br>
  
== '''编译(compilation)''' ==
+
== '''编译''' ==
 
make uImage<br>
 
make uImage<br>
== '''重新烧写系统并启动(re-program system and boot)''' ==
+
== '''重新烧写系统并启动''' ==
== '''GPIO按键操作(GPIO key operation)''' ==
+
== '''GPIO按键操作''' ==
=== GPIO_KEYS设备(GPIO_KEYS device) ===
+
=== GPIO_KEYS设备 ===
 
启动系统后即存在/sys/devices/platform/gpio-keys目录,使用ls即可看到<br>
 
启动系统后即存在/sys/devices/platform/gpio-keys目录,使用ls即可看到<br>
<span style="background:#CCCCCC">to be saved under /sys/devices/platform/gpio-keys directory after booting system,which can be seen with ls.</span><br>
 
 
<br>
 
<br>
 
  [[文件:my_imx6_gpio_3.5.1.1.jpg]]<br>
 
  [[文件:my_imx6_gpio_3.5.1.1.jpg]]<br>
第266行: 第224行:
 
$ ls /sys/devices/platform/gpio-keys<br>
 
$ ls /sys/devices/platform/gpio-keys<br>
  
=== 查看设备信息(check out device information) ===
+
=== 查看设备信息 ===
 
在proc文件系统下可以看到相关信息<br>
 
在proc文件系统下可以看到相关信息<br>
<span style="background:#CCCCCC">relatie information can be found in proc file system.</span><br>
 
 
$ cat /proc/bus/input/devices<br>
 
$ cat /proc/bus/input/devices<br>
 
<br>
 
<br>
第274行: 第231行:
 
<br>
 
<br>
  
=== 设备文件(device file) ===
+
=== 设备文件 ===
 
event0即对应gpio按键对应的设备文件,使用ls可以查看:<br>
 
event0即对应gpio按键对应的设备文件,使用ls可以查看:<br>
<span style="background:#CCCCCC">event0 is matched up with device file corresponding to gpio key,check out with ls.</span><br>
 
 
<br>
 
<br>
 
  [[文件:my_imx6_gpio_3.5.3.1.jpg]]<br>
 
  [[文件:my_imx6_gpio_3.5.3.1.jpg]]<br>
第282行: 第238行:
 
$ ls /dev/input/event0 –la<br>
 
$ ls /dev/input/event0 –la<br>
  
=== 操作示例<span style="background:#CCCCCC">operating example) ===
+
=== 操作示例===
 
见Linux测试手册<br>
 
见Linux测试手册<br>
<span style="background:#CCCCCC">refer to Linux test manual.</span><br>
+
</div>

2018年7月27日 (五) 09:58的最新版本

GPIO输出和输入

GPIO输入输出以SD1_CLK管脚为例。

修改.h文件

1)检查头文件中对SD1_CLK的配置
示例如下:
$ sed -n "/PAD_SD1_CLK/p" arch/arm/mach-mx6/board-mx6q_sabresd.h

2)注释头文件中对SD1_CLK的配置
示例如下:
$ sed -i "s/MX6Q_PAD_SD1_CLK/\/\/ &/g" arch/arm/mach-mx6/board-mx6q_sabresd.h

3)在mx6q_sabresd_pads中添加对SD1_CLK的配置
配置SD1_CLK功能为MX6Q_PAD_SD1_CLK__GPIO_1_20
示例如下:
$ sed -i "/mx6q_sabresd_pads/a\\\t MX6Q_PAD_SD1_CLK__GPIO_1_20," \
arch/arm/mach-mx6/board-mx6q_sabresd.h

4)查看修改结果
示例如下:
$ sed -n "/PAD_SD1_CLK/p" arch/arm/mach-mx6/board-mx6q_sabresd.h


配置内核

  • 菜单定位

Device Drivers ---> -*- GPIO Support ---> [*] /sys/class/gpio/... (sysfs interface)
My imx6 gpio 1.2.0.1.jpg


编译

make uImage

重新烧写系统并启动

设备操作

查看gpio目录

在/sys/class/gpio/目录下可以看到已经导出的GPIO
$ ls /sys/class/gpio/

  My imx6 gpio 1.5.1.1.jpg

向系统注册GPIO

  使用echo注册GPIO_1_20到系统,即可看到gpio目录下多出一个gpio20目录。
  提示:I.MX6 GPIO的值计算方法是(所在的组 - 1) * 32 + 序号,所以GPIO_1_20的管脚值为 (1 – 1) * 32 + 20 = 20。
$ echo 20 > /sys/class/gpio/export

  My imx6 gpio 1.5.2.1.jpg

GPIO输出控制

  • 设置管脚为输出状态

$ echo out > /sys/class/gpio/gpio20/direction

  • 设置管脚为输出为高电平

echo 1 > /sys/class/gpio/gpio20/value

  • 设置管脚为输出为低电平

echo 0 > /sys/class/gpio/gpio20/value

GPIO输入设置

  • 设置管脚为输入状态

echo in > /sys/class/gpio/gpio20/direction

  • 获取输入值

cat /sys/class/gpio/gpio20/value

注销GPIO接口

  • 注销GPIO_1_20

echo 20 > /sys/class/gpio/unexport

GPIO LED


说明:GPIO LED以PAD NANDF_CS0为例。

进入内核目录

$ cd ~/MY-I.MX6/linux-3.0.35/
My imx6 gpio 2.1.0.1.jpg

添加代码

修改.h文件

1)查找头文件中对NANDF_CS0的配置
示例如下:
$ sed -n "/PAD_NANDF_CS0/p" arch/arm/mach-mx6/board-mx6q_sabresd.h

2)注释头文件中对NANDF_CS0的配置
示例如下:
$ sed -i "s/MX6Q_PAD_NANDF_CS0/\/\/ &/g" arch/arm/mach-mx6/board-mx6q_sabresd.h

3)在mx6q_sabresd_pads中添加对NANDF_CS0的配置
配置NANDF_CS0功能为MX6Q_PAD_NANDF_CS0__GPIO_6_11
示例如下:
$ sed -i "/mx6q_sabresd_pads/a\\\tMX6Q_PAD_NANDF_CS0__GPIO_6_11," arch/arm/mach-mx6/board-mx6q_sabresd.h

4)查看修改结果
示例如下:
$ sed -n "/PAD_NANDF_CS0/p" arch/arm/mach-mx6/board-mx6q_sabresd.h


修改.c文件

1)检查.c文件中GPIO是否被重复使用
示例如下:
$ sed -n '/IMX_GPIO_NR(6,.11)/p' arch/arm/mach-mx6/board-mx6q_sabresd.c

2)在.c文件中增加GPIO的宏定义
增加#define SABRESD_USER_LED IMX_GPIO_NR(6, 11)
示例如下:
$ GPIO_DEFINE="#define SABRESD_USER_LED\tIMX_GPIO_NR(6, 11)"
$ sed -i "1,/#define/{/#define/s/#define/${GPIO_DEFINE}\n&/}" arch/arm/mach-mx6/board-mx6q_sabresd.c

2)检查gpio_led类型的数据定义
示例如下:
$ sed -n '/struct gpio_led /,/\}/p' arch/arm/mach-mx6/board-mx6q_sabresd.c

3)增加user_led的数据定义
static struct gpio_led imx6q_gpio_leds[] = {
    GPIO_LED(SABRESD_USER_LED, "user_led", 0, 1,
        "charger"),
};

内核配置

  • 菜单定位

Device Drivers ---> [*] LED Support ---> <*> LED Support for GPIO connected LEDs
My imx6 gpio 2.3.0.1.jpg

编译

make uImage

重新烧写系统并启动

GPIO_LED操作

设备文件目录

启动系统后即存在/sys/class/leds/user_led目录,使用ls即可看到
$ ls /sys/class/leds/user_led

  My imx6 gpio 2.6.1.1.jpg

操作示例

1)置NANDF_CS0为1
$ echo 1 > /sys/class/leds/user_led/brightness
2)置NANDF_CS0为0
$ echo 0 > /sys/class/leds/user_led/brightness

GPIO按键


GPIO按键以GPIO_4、EIM_BCLK、CSI0_DATA_EN为例,分别是原理图的按键SW2,SW3和SW4。

修改.h文件

1)查找头文件中对PAD的配置
示例如下:
$ sed -n "/PAD_GPIO_4/p" arch/arm/mach-mx6/board-mx6q_sabresd.h
$ sed -n "/PAD_EIM_BCLK/p" arch/arm/mach-mx6/board-mx6q_sabresd.h
$ sed -n "/PAD_CSI0_DATA_EN/p" arch/arm/mach-mx6/board-mx6q_sabresd.h

2)注释头文件中对PAD的配置
示例如下:
$ sed -i "s/MX6Q_PAD_GPIO_4/\/\/ &/g" arch/arm/mach-mx6/board-mx6q_sabresd.h
$ sed -i "s/MX6Q_PAD_EIM_BCLK/\/\/ &/g" arch/arm/mach-mx6/board-mx6q_sabresd.h
$ sed -i "s/MX6Q_PAD_CSI0_DATA_EN/\/\/ &/g" arch/arm/mach-mx6/board-mx6q_sabresd.h

3)在mx6q_sabresd_pads中添加对PAD的配置
配置GPIO_4功能为MX6Q_PAD_GPIO_4__GPIO_1_4
示例如下:
$ sed -i "/mx6q_sabresd_pads/a\\\tMX6Q_PAD_GPIO_4__GPIO_1_4," arch/arm/mach-mx6/board-mx6q_sabresd.h
配置EIM_BCLK功能为MX6Q_PAD_EIM_BCLK__GPIO_6_31
示例如下:
$ sed -i "/mx6q_sabresd_pads/a\\\tMX6Q_PAD_EIM_BCLK__GPIO_6_31," arch/arm/mach-mx6/board-mx6q_sabresd.h
配置CSI0_DATA_EN的PAD功能为MX6Q_PAD_CSI0_DATA_EN__GPIO_5_20
示例如下:
$ sed -i "/mx6q_sabresd_pads/a\\\tMX6Q_PAD_CSI0_DATA_EN__GPIO_5_20," arch/arm/mach-mx6/board-mx6q_sabresd.h

4)查看修改结果
示例如下:
$ sed -n "/PAD_GPIO_4/p" arch/arm/mach-mx6/board-mx6q_sabresd.h
$ sed -n "/PAD_EIM_BCLK/p" arch/arm/mach-mx6/board-mx6q_sabresd.h
$ sed -n "/PAD_CSI0_DATA_EN/p" arch/arm/mach-mx6/board-mx6q_sabresd.h

修改.c文件

1)检查.c文件中GPIO是否被重复使用
示例如下:
$ sed -n '/IMX_GPIO_NR(1,.4)/p' arch/arm/mach-mx6/board-mx6q_sabresd.c
$ sed -n '/IMX_GPIO_NR(6,.31)/p' arch/arm/mach-mx6/board-mx6q_sabresd.c
$ sed -n '/IMX_GPIO_NR(5,.20)/p' arch/arm/mach-mx6/board-mx6q_sabresd.c

2)在.c文件中增加GPIO的宏定义

  • MX6Q_PAD_GPIO_4__GPIO_1_4

在.c文件中添加#define SABRESD_POWER_OFF IMX_GPIO_NR(1, 4)
示例如下:
$ GPIO_DEFINE="#define SABRESD_POWER_OFF\tIMX_GPIO_NR(1, 4)"
$ sed -i "1,/#define/{/#define/s/#define/${GPIO_DEFINE}\n&/}" arch/arm/mach-mx6/board-mx6q_sabresd.c

  • MX6Q_PAD_CSI0_DATA_EN__GPIO_5_20

在.c文件中添加#define SABRESD_VOLUME_UP IMX_GPIO_NR(6, 31)
示例如下:
$ GPIO_DEFINE="#define SABRESD_VOLUME_UP\tIMX_GPIO_NR(6, 31)"
$ sed -i "1,/#define/{/#define/s/#define/${GPIO_DEFINE}\n&/}" arch/arm/mach-mx6/board-mx6q_sabresd.c

  • MX6Q_PAD_CSI0_DATA_EN__GPIO_5_20

在.c文件中添加#define SABRESD_VOLUME_DN IMX_GPIO_NR(5, 20)
示例如下:
$ GPIO_DEFINE="#define SABRESD_VOLUME_DN\tIMX_GPIO_NR(5, 20)"
$ sed -i "1,/#define/{/#define/s/#define/${GPIO_DEFINE}\n&/}" arch/arm/mach-mx6/board-mx6q_sabresd.c

3)检查gpio_keys_button类型的数据定义
示例如下:
$ sed -n '/gpio_keys_button/,/\}/p' arch/arm/mach-mx6/board-mx6q_sabresd.c

4)增加volume-up、volume-down、power的数据定义
static struct gpio_keys_button imx6q_buttons[] = {
GPIO_BUTTON(SABRESD_VOLUME_UP, KEY_VOLUMEUP, 1, "volume-up", 0, 1),
GPIO_BUTTON(SABRESD_VOLUME_DN, KEY_VOLUMEDOWN, 1, "volume-down", 0, 1),
GPIO_BUTTON(SABRESD_POWER_OFF, KEY_POWER, 1, "power", 1, 1),
};

内核配置

  • 菜单定位:

Device Drivers ---> Input device support ---> [*] Keyboards ---> <*> GPIO Buttons
My imx6 gpio 3.2.0.1.jpg

编译

make uImage

重新烧写系统并启动

GPIO按键操作

GPIO_KEYS设备

启动系统后即存在/sys/devices/platform/gpio-keys目录,使用ls即可看到

  My imx6 gpio 3.5.1.1.jpg

$ ls /sys/devices/platform/gpio-keys

查看设备信息

在proc文件系统下可以看到相关信息
$ cat /proc/bus/input/devices

  My imx6 gpio 3.5.2.1.jpg

设备文件

event0即对应gpio按键对应的设备文件,使用ls可以查看:

  My imx6 gpio 3.5.3.1.jpg

$ ls /dev/input/event0 –la

操作示例

见Linux测试手册