For GP08_SPI2_MOSI, it could be found through Column-E of the pinmux spreadsheet as following:
0x0c302028 = 0x0c302000(PADCTL_A14) + 0x00000028(Offset)
Please refer to the following parts in TRM.
=> It shows PADCTL_A14 is from group AO
=> It shows base of PADCTL_A14 is 0x0c302000
This is not available, can you help me provide one? Thank you.
I’ve sent you the pinmux spreadsheet through message.
Please refer to Column-E for SOC Ball Name.
As you are using BCM mode to control GPIO, it is not necessary to know the exact SOC Ball Name for each pins and you can just configure them with any string.
teacher:
I would like to ask the following question again:
1.How was “PADCTL_S14” found? If it’s GPO05, how can I confirm “PADCTL_S14”?
0x0c302028 = 0x0c302000(PADCTL_A14) + 0x0000028(偏移)
2. How is “PADCTLA_AO_SP2-MOSI-0” confirmed?
3.How was “14” found? Found it in that file?
line 14: "PCC.02" unused output active-high
It is PADCTL_A14 rather than PADCTL_S14.
Could you check the following image I shared above?
Please check the pinmux spreadsheet to know it is SPI2 MOSI and search it in TRM.
I have also provided the required information as following:
Please check all contents I listed in How to define the PIN number for GPIO that is not in the 40PIN? - #20 by KevinFFF and How to define the PIN number for GPIO that is not in the 40PIN? - #27 by KevinFFF again and you should be able to create the line for another pin.
Teacher, I noticed your reply, but it was a bit brief, which made me not entirely sure.
Can you judge if my approach is the same as yours?
line 14: "PCC.02" unused output active-high
$sudo apt update
$sudo apt install gpiod
$gpioinfo
Yes, 14 is derived from line 14 reported by gpioinfo command.
The following statement has clearly mentioned about this.
If they cannot be configured as GPIO(not PORT and PIN number for that pin in pinmux spreadsheet.), then they can not be used as GPIO.
Please note that jetson.gpio controls the GPIO based on gpiod.
Please ignore the register with name including CFG2TMC string.
teacher:
I don’t quite understand the meaning of this sentence. Are you asking me to ignore it
That part? For example, is it the blue part below?
Please ignore PADCTL_AO_CFG2TMC_SPI2_MOSI_0 this register, which is used for the pull strength.
Just refer to the offset(0x28) of this PADCTL register. (i.e. PADCTL_AO_SPI2_MOSI_0)
=> 0x0c302028 = 0x0c302000(PADCTL_A14) + 0x00000028(Offset)
Okay, thank you, teacher. Let me fill in ‘GPO08’ again using this method.
Please search SOC_GPIO29 for this PIN in TRM.
Why choose “SOC_GPIO29” search instead of other options?
Please refer to Column-D for its “Verilog Ball Name”, or you can simply check the option of unused_SOC_GPIO29.
PQ.02 belongs to tegra234-gpio controller so that please specify tegra234-gpio instead of tegra234-gpio-aon.
You can run sudo gpiodetect and sudo gpioinfo to check and you will find PQ.02 is under gpiochip0 as following:
$ sudo gpioinfo|grep -E "gpiochip|PQ.02"
gpiochip0 - 164 lines:
line 102: "PQ.02" unused input active-high
gpiochip1 - 32 lines:
$ sudo gpiodetect
gpiochip0 [tegra234-gpio] (164 lines)
gpiochip1 [tegra234-gpio-aon] (32 lines)