IMX8QXP,How to set gpio by register

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IMX8QXP,How to set gpio by register

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Contributor II

HI ALL, 

            IMX8QXP, How to set by register,for example GPIO1_20.

            by datasheet:

            7.2.2.3.2 GPIO Write Mode
The programming sequence for driving output signals should be as follows:
1. Configure IOMUX to select GPIO mode (Via IOMUXC), also enable SION if need
to read loopback pad value through PSR
2. Configure GPIO direction register to output (GPIO_GDIR[GDIR] set to 1b).
3. Write value to data register (GPIO_DR).
A pseudocode description to drive 4'b0101 on [output3:output0] is as follows:
// SET PADS TO GPIO MODE VIA IOMUX.
i.MX 8DualXPlus/8QuadXPlus Applications Processor Reference Manual, Rev. A, 6/2017

write sw_mux_ctl_pad_<output[0-3]>.mux_mode, <GPIO_MUX_MODE>
// Enable loopback so we can capture pad value into PSR in output mode
write sw_mux_ctl_pad_<output[0-3]>.sion, 1
// SET GDIR=1 TO OUTPUT BITS.
write GDIR[31:4,output3_bit,output2_bit, output1_bit, output0_bit,] 32'hxxxxxxxF
// WRITE OUTPUT VALUE=4’b0101 TO DR.
write DR, 32'hxxxxxxx5
// READ OUTPUT VALUE FROM PSR ONLY.
read_cmp PSR, 32'hxxxxxxx5
General Purpose Input/Output (GPIO)

I want to configure SC_P_FLEXCAN2_TX to GPIO,  now ,I found how to config GPIO_DR GPIO_GDIR GPIO_PSR, 

as follow code:

base: 0x5D09_0000

GPIO_DR addr:0x5D090000 value:0x5C16600D

GPIO_GDIR addr:0x5D090004 value:0x1C156000

GPIO_PSR addr:0x5D090008 value:0x5C16600D

but I can not find the IOMUXC control register address? could you help me ?

by the IMX8DQXPRM_Rev_A.pdf datasheet ,I try to access the iomux base , but have these error

135|@nutshell:/ # ./var/memtool -r 0x33F80000 0x0
[ 2384.218394] Unhandled fault: synchronous external abort (0x92000210) at 0x0000ffff9e21c000
Bus error 

why? who can tell me ?

2 Replies

124 Views
NXP TechSupport
NXP TechSupport

Hi, Yang,

I am sorry, this is DSC community, pls post your case to i.mx community:

https://community.nxp.com/community/imx 

BR

Xiangjun Rong

124 Views
Contributor II

thanks, I will post the case to  i.mx community

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