i.MX6ULL-S使用GPIO的问题
本帖最后由 hermes 于 2021-2-17 23:43 编辑我现在正在做的一个板子用的是6ULL-S作为核心板，用到了4个GPIO，分别是
GPIO5.IO 对应的编号是128
GPIO5.IO 对应的编号是134
GPIO3.IO 对应的编号是91GPIO3.IO 对应的编号是92
首先，/sys/class/gpio目录下的情况如下
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**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
其实我这个板子用不到lcd，目前烧录的系统用的dts是imx6ull-S-emmc-1024x600c7.dts这个
然后我按照教程去修改了一些dts，但是按照那个gpio测试shell去测试，一直提示失败
sh脚本如下
#!/bin/bash
echo Exporting pin $1.
echo $1> /sys/class/gpio/export
echo Setting pin out
cat /sys/class/gpio/gpio$1/value
echo out > /sys/class/gpio/gpio$1/value
echo Setting pin high.
echo 1 > /sys/class/gpio/gpio$1/value
echo $1> /sys/class/gpio/unexport
然后我执行./open.sh 91
执行./open.sh 128
原因不明，到底是我配置没生效还是什么别的原因
dts修改的部分如下
imx6ull-S-emmc-1024x600c7.dts
imx6ull-14x14-evk.dts
目前看修改逻辑应该没问题啊
启用了对应的gpio的define
然后禁用了会复用到的组件
我有make dtbs然后copy到板子上然后执行sync
想知道应该如何修改才能成功
您的引脚复用有问题，您需要修改imx6ull-14x14-evk.dts，将引脚的其他复用去掉，并将这些引脚在iomux处复用成gpio，有几个需要在IOMUXC_SNVS里复用成gpio，可以查看CPU手册确认是哪些引脚，另外您控制GPIO时需要设置方向 zhichao 发表于 2021-2-21 10:45
您的引脚复用有问题，您需要修改imx6ull-14x14-evk.dts，将引脚的其他复用去掉，并将这些引脚在iomux处复用 ...
你好，看了下你的回复，逻辑是ok的，但是我的贴子里有详细截图
我是把那些影响的都disabled了，我这个操作本身也是根据你这边给的应用笔记的逻辑来的
您改的有问题，我提供的方法是举的例子，您改的时候要根据实际的引脚改，保证一个引脚只在一个地方复用，GPIO5.IO和GPIO5.IO 是IOMUXC_SNVS寄存器里的，需要在设备树里添加&iomuxc_snvs，在这里边复用gpio，我提供的应用笔记里有测试方法，您写的shell有问题，用我提供的文档里的方法吧 zhichao 发表于 2021-2-23 08:50
您改的有问题，我提供的方法是举的例子，您改的时候要根据实际的引脚改，保证一个引脚只在一个地方复用，GP ...
好的，谢谢，我试下 zhichao 发表于 2021-2-23 08:50
您改的有问题，我提供的方法是举的例子，您改的时候要根据实际的引脚改，保证一个引脚只在一个地方复用，GP ...
我试了下，添加到了IOMUXC_SNVS
但是开机后看还是老样子，看开机信息有个bad crc use default envirment
不知道有么有关系
hermes 发表于 2021-2-27 22:21
我试了下，添加到了IOMUXC_SNVS
但是开机后看还是老样子，看开机信息有个bad crc use default envirment ...
你的设备树修改的有点儿问题，附件里是一个添加了&iomuxc_snvs节点的设备树，你在这个设备树里边修改试试
肉肉珩 发表于 2021-3-1 09:18
你的设备树修改的有点儿问题，附件里是一个添加了&iomuxc_snvs节点的设备树，你在这个设备树里边修改试试 ...
你好，朋友，我拿你这边提供的进去编译了下dtb，开机后还是一样的，没有什么区别
本帖最后由 hermes 于 2021-3-2 10:34 编辑
肉肉珩 发表于 2021-3-1 09:18
你的设备树修改的有点儿问题，附件里是一个添加了&iomuxc_snvs节点的设备树，你在这个设备树里边修改试试 ...
你好，朋友，如果方便，可以加下我的vx吗，id是shawburn
这样可能解答快一点，不会经常烦扰的，就问几个问题，而且我也是通情达理的人，知道技术专家都很忙的，你们的工作是有价值的 本帖最后由 肉肉珩 于 2021-3-3 16:37 编辑
hermes 发表于 2021-3-2 10:31
你好，朋友，如果方便，可以加下我的vx吗，id是shawburn
这样可能解答快一点，不会经常烦扰的，就问几个 ...
1、我给你发的设备树里在iomuxc_snvs节点下的pinctrl里已经定义成gpio了，SNVS_TAMPER0复用的gpio5.0
2、出厂的设备树里SNVS_TAMPER0复用gpio5.0，用做了触摸，可以看一下硬件原理图，修改设备树的时候需要把原来的功能屏蔽掉，echo $1 >/sys/class/gpio/export 后如果没有生成相应目录，一般都是复用配置不正确，或者功能冲突
3、建议先用命令行测试几个引脚，保证方法没问题后再写脚本
以SNVS_TAMPER0复用的gpio5.0为例，可参考一下图片（给你发的最新的设备树里截得图）
肉肉珩 发表于 2021-3-3 16:30
1、我给你发的设备树里在iomuxc_snvs节点下的pinctrl里已经定义成gpio了，SNVS_TAMPER0复用的gpio5.0
2 ...
嗯，之前确实没注意到GPIO5_0的这个复用，我按照您这边的禁用了这个相关的，继续测试
不显示说目录不存在，但是还是会报operation not permitted，而且我只echo $1> /sys/class/gpio/export这一步也还是没有目录生成的。
整个问题最初开始我GPIO3.IO 对应的编号是91
GPIO3.IO 对应的编号是92
这两个不是snvs的复用我也注意了禁用相关的组件，比如I2C2，ov相机和csi和lcd都禁用了
但是最开始也一样这样报错，所以比较懵，和想象中完全不一样，感觉不只是snvs的问题。
都是引脚复用了，即使正确也都没法生成目录然后操作 本帖最后由 肉肉珩 于 2021-3-4 12:57 编辑
hermes 发表于 2021-3-3 22:06
嗯，之前确实没注意到GPIO5_0的这个复用，我按照您这边的禁用了这个相关的，继续测试
不显示说目录不存 ...
operation not permitted这个应该是你的脚本里测试指令写的不对，你的脚本里 把 out重定向到value里了，所以才会报错，我看前边给你发了回复和应用笔记，以为你看到并改了呢，你按照应用笔记里的方法改一下指令再试试。
肉肉珩 发表于 2021-3-4 12:50
operation not permitted这个应该是你的脚本里测试指令写的不对，你的脚本里 把 out重定向到value里了， ...
按照您这边所说的修改了
#!/bin/bash
echo Exporting pin $1.
echo $1> /sys/class/gpio/export
echo Setting pin out
echo "out" > /sys/class/gpio/gpio$1/direction
cat /sys/class/gpio/gpio$1/value
echo Setting pin high.
echo "1" > /sys/class/gpio/gpio$1/value
cat /sys/class/gpio/gpio$1/value
修改后再读取值，发现值永远都是0
试了128 134 91 92 hermes 发表于 2021-3-14 22:47
按照您这边所说的修改了
#!/bin/bash
echo Exporting pin $1.
用万用表量电压，要是看value值，有些引脚需要做SION位回环
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