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kernel_drivers_examples/debug/gpio
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zeroway ddfad848fe Init for webwiki
2019-06-12 18:04:58 +08:00
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gpio1.png
GPIO : hacking gpio on registers
2019-05-24 16:27:10 +08:00
pmugrf_gpio1a_iomux.png
GPIO : hacking gpio on registers
2019-05-24 16:27:10 +08:00
pmugrf.png
GPIO : hacking gpio on registers
2019-05-24 16:27:10 +08:00
README.md
Init for webwiki
2019-06-12 18:04:58 +08:00

README.md

GPIO状态调试

假设现在想要查看GPIO1_A0的mux状态

GPIO1对应的寄存器名为PMUGRF_GPIO1A_IOMUX(offset 0x10)

GPIO1 MUX

查看手册知道PMUGRF的基地址如下截图(FF32_0000 - FF33_0000)

PMUGRF BASE ADDR

查看该寄存器的值

io -4 -r 0xff320010

查看该IO口是高电平还是低电平

GPIO1对应的寄存器基地址为(FF73_0000 - FF74_0000)

GPIO1 BASE ADDR

控制IO口输出状态

IO口的值保存在GPIO_SWPORTA_DR(offset 0x0)寄存器中

查看该寄存器的值(其中最低位对应GPIO1_A0)

io -4 -r 0xff730000

将GPIO1_A0拉高

io -4 -w 0xff730000 0x01822401

将GPIO1_A0拉低

io -4 -w 0xff730000 0x01822400