GPIO operation method of imx6ull

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Preface

This article will take you to learn how to operate imx6ull Of GPIO port , I'm sure you're interested in GPIO Now I will take you to learn how to operate imx6ull Of GPIO.

One 、CCM Clock Controller Module ( Clock control module )

Want to use GPIO The first step is to enable GPIO 了 ,CCM It is a clock controller. Under the chip manual, we can find its location as follows .
1. First navigate to the... Of the directory 18 Chapter
2. find CCM Clock tree
3. find GPIOn
4. find GPIOn Post view corresponding GPIO Group

Two 、IOMUXC ​: IOMUX Controller,IO Multiplex controller

The second step is to set the pin to GPIO Pattern .
In chapter of the chip manual 32 Chapter can be found IOMUX Set the corresponding pin to GPIO Pattern

3、 ... and 、GPIO: General-purpose input/output, Universal input and output port

The third step is to set GPIO Input or output mode
Find chapter of the chip manual 28 Chapter
find GPIO_GDIR This register is GPIO Direction register for , By setting this register GPIO Set to input or output mode .

Four 、 Read GPIO state

Find No 28 Chapter GPIO_PSR Register read the contents of this register to read GPIO The state of .

5、 ... and 、 Write GPIO state

Find No 28 Chapter GPIO_DR Register read this register and write the level you want to control into this pin to control GPIO Output level of .

summary

Specific operation GPIO Methods let's move on to the next article , This article mainly wants to let you know how to read the chip manual to control GPIO port .