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AM625: Assistance Needed for SPI Driver and GPIO Configuration Issues on AM62x E3 Evaluation Board

raj kumar
Prodigy 125 points
Part Number: AM625
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

Dear TI Support Team,

root@am62xx-evm:/# cd libgpiod-2.0
root@am62xx-evm:/libgpiod-2.0# LS
-sh: LS: command not found
root@am62xx-evm:/libgpiod-2.0# ls
COPYING      LICENSES     NEWS    TODO        autogen.sh      autostuff  config.log  configure.ac  include         lib  man    tools
Doxyfile.in  Makefile.am  README  aclocal.m4  autom4te.cache  bindings   configure   configure~    index_FDS.html  m4   tests
root@am62xx-evm:/libgpiod-2.0# sudo ./autogen.sh
autoreconf: export WARNINGS=
autoreconf: Entering directory '.'
autoreconf: configure.ac: not using Gettext
autoreconf: running: aclocal --force -I m4
autoreconf: configure.ac: tracing
autoreconf: running: libtoolize --copy --force
libtoolize: putting auxiliary files in AC_CONFIG_AUX_DIR, 'autostuff'.
libtoolize: copying file 'autostuff/ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIRS, 'm4'.
libtoolize: copying file 'm4/libtool.m4'
libtoolize: copying file 'm4/ltoptions.m4'
libtoolize: copying file 'm4/ltsugar.m4'
libtoolize: copying file 'm4/ltversion.m4'
libtoolize: copying file 'm4/lt~obsolete.m4'
autoreconf: configure.ac: not using Intltool
autoreconf: configure.ac: not using Gtkdoc
autoreconf: running: aclocal --force -I m4
autoreconf: running: /usr/bin/autoconf --force
configure.ac:75: warning: The macro 'AC_HEADER_STDC' is obsolete.
configure.ac:75: You should run autoupdate.
../autoconf-2.72e/lib/autoconf/headers.m4:663: AC_HEADER_STDC is expanded from...
configure.ac:75: the top level
configure.ac:203: error: Unexpanded AX_ macro found. Please install GNU autoconf-archive.
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
autoreconf: error: /usr/bin/autoconf failed with exit status: 1
root@am62xx-evm:/libgpiod-2.0#


I am currently working on the AM62x E3 evaluation board and am encountering issues with the SPI driver. Specifically, the spidev device is not appearing in the /dev/ directory. We have enabled SPI in the Device Tree Source (DTS) file and compiled it, following the guide provided on the TI website. However, the spidev device node still does not show up.

To further diagnose this issue, I would like to rule out any potential hardware-related problems. My plan is to configure the SPI pins as GPIO output pins and toggle them to check the voltage levels. If the voltage levels change, it would suggest that the issue lies within the Device Tree Binary (DTB) configuration.

To achieve this, I used TI’s SysConfig tool to configure the SPI pins as output pins with pull-down settings. The tool generated the corresponding DTSI file, and I integrated the pin configuration into the DTS file. The file compiled successfully, but I now need assistance toggling the GPIO pins through application code or commands to verify the voltage levels on the SPI0 pins.

Here’s what I have tried so far:

Accessing GPIO through sysfs:
I attempted to access the /sys/class/gpio directory to toggle the GPIO pins, but the directory is missing. Upon further research, I found that the sysfs interface for GPIO control has been deprecated, and suggestions point towards using libgpiod.

Using libgpiod:
I downloaded the libgpiod library from GitHub and tried to compile and build it locally. However, I encountered errors when executing the ./autogen.sh script. I have attached the error details for reference.

Could you please guide me on how to properly toggle the GPIO pins using application code, particularly to check the voltage levels on the SPI0 pins? Earlier, we used sysfs to easily export and control GPIOs, but with the deprecation of sysfs, I am uncertain about the correct method to proceed.

Your assistance would be greatly appreciated.

Thank you!

Best regards,
Raj

  • +1
    TI__Genius 12040 points

    Hi Raj,

    Each pin has its own MUXMODE for different applications. For SPI pins, if the MUXMODE is 0, then they will support SPI.

    raj kumar said:
    My plan is to configure the SPI pins as GPIO output pins and toggle them to check the voltage levels.

    If you want to use a pin as a GPIO, then you'll have to define it as GPIO in the device tree by setting the MUXMODE to 7.

    raj kumar said:
    Upon further research, I found that the sysfs interface for GPIO control has been deprecated, and suggestions point towards using libgpiod.

    The new way is using Chardev interface: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1260373/faq-transitioning-the-gpio-userspace-interface-from-sysfs-to-chardev

    Depending on which SDK version you are using, the command flags are different so check the command's help menu with --help first.

    raj kumar said:
    I downloaded the libgpiod library from GitHub and tried to compile and build it locally.

    Since this is not a TI product or software, we are not able to provide assistance with this on the E2E forums.

    For configuring the device tree to support GPIOs, you can refer to this E2E thread: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1268671/sk-am62-using-the-gpios-in-the-40-pin-user-expansion-port/4804378

    Best Regards,

    Anshu

  • 0 in reply to Anshu Madwesh
    Prodigy 125 points

    Hai Anshu,

    I have loaded the default Debian image on my AM62x evaluation board and successfully installed gpiod using the following command:
    #sudo apt install gpiod
    After installation, I confirmed that the GPIO chips were detected by running gpiodetect, which displayed the available GPIO chip details.

    Following your previous advice, I used the SysConfig tool to configure the SPI pins as GPIO in mode 7. However, when I run gpioinfo, it shows all the GPIO pins as inputs with an active-high state by default. For my application, I need to toggle one of the GPIO pins.

    I attempted to set a pin to low with the following command:
    #gpioset gpiochip1 19=0
    When I run this command, the pin does get configured as an output, but its state does not change as expected. The voltage levels remain the same, and the pin does not go low. I tried executing the command with sudo as well, but the issue persists.

    This behavior occurs even with the default TI image. I suspect it could be related to a hardware configuration issue, as the voltage levels are not responding to changes in the command.

    Please find attached the relevant DTSI code for reference. Could you help me identify what might be causing this problem and guide me in resolving it?

    Even I have tried with the TI default image also , same issue I am facing. 

    Thank you for your assistance.

    /* in side of pmx0 i have added this lines */
mygpio1_pins_default: mygpio1-pins-default {
        	pinctrl-single,pins = <
        	        AM62X_IOPAD(0x01d0, PIN_OUTPUT_PULLUP, 7) /* (A15) UART0_CTSn.GPIO1_22 */
                       AM62X_IOPAD(0x0088, PIN_OUTPUT, 7) /* (L24) GPMC0_OEn_REn.GPIO0_33 */
             		AM62X_IOPAD(0x01b4, PIN_OUTPUT_PULLDOWN, 7) /* (A13) SPI0_CS0.GPIO1_15 */
			AM62X_IOPAD(0x01bc, PIN_OUTPUT_PULLDOWN, 7) /* (A14) SPI0_CLK.GPIO1_17 */
			AM62X_IOPAD(0x01c0, PIN_OUTPUT_PULLDOWN, 7) /* (B13) SPI0_D0.GPIO1_18 */
			AM62X_IOPAD(0x01c4, PIN_OUTPUT_PULLDOWN, 7) /* (B14) SPI0_D1.GPIO1_19 */
			AM62X_IOPAD(0x00ac, PIN_OUTPUT_PULLDOWN, 7) /* (l21) */
			
        >;
	};
	
	
/*	out side of pmx0 i have added the node details*/
&main_gpio0 {
    pinctrl-names = "default";
    pinctrl-0 = <&mygpio1_pins_default>;
    status = "okay";
};

  • 0 in reply to raj kumar
    TI__Genius 12040 points

    Hi Raj,

    Can you share the output of gpioinfo and gpiodetect? I want to know which module gpiochip1 is pointing to.

    gpiodetect will show which GPIO module is assigned to which chip. For GPIO1_19, you should be looking for an address of 0x601000.

    The device tree configuration seems fine right now.



    Best Regards,

    Anshu

  • 0 in reply to Anshu Madwesh
    Prodigy 125 points

    Hai Anshu,

    Thank you for your support. I wanted to share the current issues we're encountering with the AM62x E3 evaluation board and request your guidance on addressing them.

    1. GPIO State Synchronization Issue
    We’ve been able to toggle the GPIO pins successfully on the hardware, as confirmed by observing the state changes with an oscilloscope. However, we’re seeing a discrepancy in the software, as the GPIO states are not updating accordingly. To aid in troubleshooting, I have attached the output of the gpiodetect and gpioinfo commands. The hardware appears to be functioning correctly, as confirmed by the signals on the SPI lines, so we suspect a potential software-related issue.

    Could you provide guidance on how to ensure proper synchronization of GPIO states in the software? Any insights on additional configuration steps we may need to check would be greatly appreciated.

    2. Enabling SPI on AM62x E3 Evaluation Board
    In addition, we are unable to locate the SPI device under the /dev directory. Could you provide instructions on enabling SPI functionality on the AM62x E3 evaluation board, including any necessary kernel module configurations or device tree adjustments?

    Your assistance on these matters would be invaluable to us.

    Thank you for your time and support.

    Best Regards

    Raj

    root@am62xx-evm:~# gpiodetect
gpiochip0 [600000.gpio] (92 lines)
gpiochip1 [601000.gpio] (52 lines)
gpiochip2 [1-0022] (24 lines)
root@am62xx-evm:~# gpioinfo
gpiochip0 - 92 lines:
         line   0:      unnamed       unused   input  active-high
         line   1:      unnamed       unused   input  active-high
         line   2:      unnamed       unused   input  active-high
         line   3:      unnamed       unused   input  active-high
         line   4:      unnamed       unused   input  active-high
         line   5:      unnamed       unused   input  active-high
         line   6:      unnamed       unused   input  active-high
         line   7:      unnamed       unused   input  active-high
         line   8:      unnamed       unused   input  active-high
         line   9:      unnamed       unused   input  active-high
         line  10:      unnamed       unused   input  active-high
         line  11:      unnamed       unused   input  active-high
         line  12:      unnamed       unused   input  active-high
         line  13:      unnamed       unused   input  active-high
         line  14:      unnamed       unused   input  active-high
         line  15:      unnamed       unused   input  active-high
         line  16:      unnamed       unused   input  active-high
         line  17:      unnamed       unused   input  active-high
         line  18:      unnamed       unused   input  active-high
         line  19:      unnamed       unused   input  active-high
         line  20:      unnamed       unused  output  active-high
         line  21:      unnamed       unused   input  active-high
         line  22:      unnamed       unused   input  active-high
         line  23:      unnamed       unused   input  active-high
         line  24:      unnamed       unused   input  active-high
         line  25:      unnamed       unused   input  active-high
         line  26:      unnamed       unused   input  active-high
         line  27:      unnamed       unused   input  active-high
         line  28:      unnamed       unused   input  active-high
         line  29:      unnamed       unused   input  active-high
         line  30:      unnamed       unused   input  active-high
         line  31:      unnamed   "tlv71033"  output  active-high [used]
         line  32:      unnamed       unused   input  active-high
         line  33:      unnamed       unused   input  active-high
         line  34:      unnamed       unused   input  active-high
         line  35:      unnamed       unused   input  active-high
         line  36:      unnamed       unused   input  active-high
         line  37:      unnamed       unused   input  active-high
         line  38:      unnamed       unused   input  active-high
         line  39:      unnamed       unused   input  active-high
         line  40:      unnamed       unused   input  active-high
         line  41:      unnamed       unused   input  active-high
         line  42:      unnamed       unused   input  active-high
         line  43:      unnamed       unused   input  active-high
         line  44:      unnamed       unused   input  active-high
         line  45:      unnamed       unused   input  active-high
         line  46:      unnamed       unused   input  active-high
         line  47:      unnamed       unused   input  active-high
         line  48:      unnamed       unused   input  active-high
         line  49:      unnamed       unused   input  active-high
         line  50:      unnamed       unused   input  active-high
         line  51:      unnamed       unused   input  active-high
         line  52:      unnamed       unused   input  active-high
         line  53:      unnamed       unused   input  active-high
         line  54:      unnamed       unused   input  active-high
         line  55:      unnamed       unused   input  active-high
         line  56:      unnamed       unused   input  active-high
         line  57:      unnamed       unused   input  active-high
         line  58:      unnamed       unused   input  active-high
         line  59:      unnamed       unused   input  active-high
         line  60:      unnamed       unused   input  active-high
         line  61:      unnamed       unused   input  active-high
         line  62:      unnamed       unused   input  active-high
         line  63:      unnamed       unused   input  active-high
         line  64:      unnamed       unused   input  active-high
         line  65:      unnamed       unused   input  active-high
         line  66:      unnamed       unused   input  active-high
         line  67:      unnamed       unused   input  active-high
         line  68:      unnamed       unused   input  active-high
         line  69:      unnamed       unused   input  active-high
         line  70:      unnamed       unused   input  active-high
         line  71:      unnamed       unused   input  active-high
         line  72:      unnamed       unused   input  active-high
         line  73:      unnamed       unused   input  active-high
         line  74:      unnamed       unused   input  active-high
         line  75:      unnamed       unused   input  active-high
         line  76:      unnamed       unused   input  active-high
         line  77:      unnamed       unused   input  active-high
         line  78:      unnamed       unused   input  active-high
         line  79:      unnamed       unused   input  active-high
         line  80:      unnamed       unused   input  active-high
         line  81:      unnamed       unused   input  active-high
         line  82:      unnamed       unused   input  active-high
         line  83:      unnamed       unused   input  active-high
         line  84:      unnamed       unused   input  active-high
         line  85:      unnamed       unused   input  active-high
         line  86:      unnamed       unused   input  active-high
         line  87:      unnamed       unused   input  active-high
         line  88:      unnamed       unused   input  active-high
         line  89:      unnamed       unused   input  active-high
         line  90:      unnamed       unused   input  active-high
         line  91:      unnamed       unused   input  active-high
gpiochip1 - 52 lines:
         line   0:      unnamed       unused   input  active-high
         line   1:      unnamed       unused   input  active-high
         line   2:      unnamed       unused   input  active-high
         line   3:      unnamed       unused   input  active-high
         line   4:      unnamed       unused   input  active-high
         line   5:      unnamed       unused   input  active-high
         line   6:      unnamed       unused   input  active-high
         line   7:      unnamed       unused   input  active-high
         line   8:      unnamed       unused   input  active-high
         line   9:      unnamed       unused   input  active-high
         line  10:      unnamed       unused   input  active-high
         line  11:      unnamed       unused   input  active-high
         line  12:      unnamed       unused   input  active-high
         line  13:      unnamed       unused   input  active-high
         line  14:      unnamed       unused   input  active-high
         line  15:      unnamed       unused   input  active-high
         line  16:      unnamed       unused   input  active-high
         line  17:      unnamed       unused   input  active-high
         line  18:      unnamed       unused   input  active-high
         line  19:      unnamed       unused   input  active-high
         line  20:      unnamed       unused   input  active-high
         line  21:      unnamed       unused   input  active-high
         line  22:      unnamed       unused   input  active-high
         line  23:      unnamed       unused   input  active-high
         line  24:      unnamed       unused   input  active-high
         line  25:      unnamed       unused   input  active-high
         line  26:      unnamed       unused   input  active-high
         line  27:      unnamed       unused   input  active-high
         line  28:      unnamed       unused   input  active-high
         line  29:      unnamed       unused   input  active-high
         line  30:      unnamed       unused   input  active-high
         line  31:      unnamed       unused   input  active-high
         line  32:      unnamed       unused   input  active-high
         line  33:      unnamed       unused   input  active-high
         line  34:      unnamed       unused   input  active-high
         line  35:      unnamed       unused   input  active-high
         line  36:      unnamed       unused   input  active-high
         line  37:      unnamed       unused   input  active-high
         line  38:      unnamed       unused   input  active-high
         line  39:      unnamed       unused   input  active-high
         line  40:      unnamed       unused   input  active-high
         line  41:      unnamed       unused   input  active-high
         line  42:      unnamed       unused   input  active-high
         line  43:      unnamed       unused   input  active-high
         line  44:      unnamed       unused   input  active-high
         line  45:      unnamed       unused   input  active-high
         line  46:      unnamed       unused   input  active-high
         line  47:      unnamed       unused   input  active-high
         line  48:      unnamed       unused   input  active-high
         line  49:      unnamed "am62-sk:green:heartbeat_none" output 
active-high [used]
         line  50:      unnamed       unused   input  active-high
         line  51:      unnamed       unused   input  active-high
gpiochip2 - 24 lines:
         line   0: "GPIO_CPSW2_RST" unused input active-high
         line   1: "GPIO_CPSW1_RST" unused input active-high
         line   2: "PRU_DETECT"       unused   input  active-high
         line   3: "MMC1_SD_EN" "regulator-3" output active-high [used]
         line   4: "VPP_LDO_EN"       unused   input  active-high
         line   5: "EXP_PS_3V3_En" unused input active-high
         line   6: "EXP_PS_5V0_En" unused input active-high
         line   7: "EXP_HAT_DETECT" unused input active-high
         line   8: "GPIO_AUD_RSTn" unused input active-high
         line   9: "GPIO_eMMC_RSTn" unused input active-high
         line  10: "UART1_FET_BUF_EN" unused input active-high
         line  11:   "WL_LT_EN"       unused   input  active-high
         line  12: "GPIO_HDMI_RSTn" unused input active-high
         line  13:  "CSI_GPIO1"       unused   input  active-high
         line  14:  "CSI_GPIO2"       unused   input  active-high
         line  15: "PRU_3V3_EN"       unused   input  active-high
         line  16:  "HDMI_INTn"  "interrupt"   input  active-high [used]
         line  17: "PD_I2C_IRQ"       unused   input  active-high
         line  18: "MCASP1_FET_EN" unused input active-high
         line  19: "MCASP1_BUF_BT_EN" unused input active-high
         line  20: "MCASP1_FET_SEL" unused output active-high
         line  21: "UART1_FET_SEL" unused input active-high
         line  22:     "TSINT#"       unused   input  active-high
         line  23: "IO_EXP_TEST_LED" unused input active-high





		root@am62xx-evm:~# gpioset gpiochip1 19=1 root@am62xx-evm:~# gpioinfo
gpiochip0 - 92 lines:
         line   0:      unnamed       unused   input  active-high
         line   1:      unnamed       unused   input  active-high
         line   2:      unnamed       unused   input  active-high
         line   3:      unnamed       unused   input  active-high
         line   4:      unnamed       unused   input  active-high
         line   5:      unnamed       unused   input  active-high
         line   6:      unnamed       unused   input  active-high
         line   7:      unnamed       unused   input  active-high
         line   8:      unnamed       unused   input  active-high
         line   9:      unnamed       unused   input  active-high
         line  10:      unnamed       unused   input  active-high
         line  11:      unnamed       unused   input  active-high
         line  12:      unnamed       unused   input  active-high
         line  13:      unnamed       unused   input  active-high
         line  14:      unnamed       unused   input  active-high
         line  15:      unnamed       unused   input  active-high
         line  16:      unnamed       unused   input  active-high
         line  17:      unnamed       unused   input  active-high
         line  18:      unnamed       unused   input  active-high
         line  19:      unnamed       unused   input  active-high
         line  20:      unnamed       unused  output  active-high
         line  21:      unnamed       unused   input  active-high
         line  22:      unnamed       unused   input  active-high
         line  23:      unnamed       unused   input  active-high
         line  24:      unnamed       unused   input  active-high
         line  25:      unnamed       unused   input  active-high
         line  26:      unnamed       unused   input  active-high
         line  27:      unnamed       unused   input  active-high
         line  28:      unnamed       unused   input  active-high
         line  29:      unnamed       unused   input  active-high
         line  30:      unnamed       unused   input  active-high
         line  31:      unnamed   "tlv71033"  output  active-high [used]
         line  32:      unnamed       unused   input  active-high
         line  33:      unnamed       unused   input  active-high
         line  34:      unnamed       unused   input  active-high
         line  35:      unnamed       unused   input  active-high
         line  36:      unnamed       unused   input  active-high
         line  37:      unnamed       unused   input  active-high
         line  38:      unnamed       unused   input  active-high
         line  39:      unnamed       unused   input  active-high
         line  40:      unnamed       unused   input  active-high
         line  41:      unnamed       unused   input  active-high
         line  42:      unnamed       unused   input  active-high
         line  43:      unnamed       unused   input  active-high
         line  44:      unnamed       unused   input  active-high
         line  45:      unnamed       unused   input  active-high
         line  46:      unnamed       unused   input  active-high
         line  47:      unnamed       unused   input  active-high
         line  48:      unnamed       unused   input  active-high
         line  49:      unnamed       unused   input  active-high
         line  50:      unnamed       unused   input  active-high
         line  51:      unnamed       unused   input  active-high
         line  52:      unnamed       unused   input  active-high
         line  53:      unnamed       unused   input  active-high
         line  54:      unnamed       unused   input  active-high
         line  55:      unnamed       unused   input  active-high
         line  56:      unnamed       unused   input  active-high
         line  57:      unnamed       unused   input  active-high
         line  58:      unnamed       unused   input  active-high
         line  59:      unnamed       unused   input  active-high
         line  60:      unnamed       unused   input  active-high
         line  61:      unnamed       unused   input  active-high
         line  62:      unnamed       unused   input  active-high
         line  63:      unnamed       unused   input  active-high
         line  64:      unnamed       unused   input  active-high
         line  65:      unnamed       unused   input  active-high
         line  66:      unnamed       unused   input  active-high
         line  67:      unnamed       unused   input  active-high
         line  68:      unnamed       unused   input  active-high
         line  69:      unnamed       unused   input  active-high
         line  70:      unnamed       unused   input  active-high
         line  71:      unnamed       unused   input  active-high
         line  72:      unnamed       unused   input  active-high
         line  73:      unnamed       unused   input  active-high
         line  74:      unnamed       unused   input  active-high
         line  75:      unnamed       unused   input  active-high
         line  76:      unnamed       unused   input  active-high
         line  77:      unnamed       unused   input  active-high
         line  78:      unnamed       unused   input  active-high
         line  79:      unnamed       unused   input  active-high
         line  80:      unnamed       unused   input  active-high
         line  81:      unnamed       unused   input  active-high
         line  82:      unnamed       unused   input  active-high
         line  83:      unnamed       unused   input  active-high
         line  84:      unnamed       unused   input  active-high
         line  85:      unnamed       unused   input  active-high
         line  86:      unnamed       unused   input  active-high
         line  87:      unnamed       unused   input  active-high
         line  88:      unnamed       unused   input  active-high
         line  89:      unnamed       unused   input  active-high
         line  90:      unnamed       unused   input  active-high
         line  91:      unnamed       unused   input  active-high
gpiochip1 - 52 lines:
         line   0:      unnamed       unused   input  active-high
         line   1:      unnamed       unused   input  active-high
         line   2:      unnamed       unused   input  active-high
         line   3:      unnamed       unused   input  active-high
         line   4:      unnamed       unused   input  active-high
         line   5:      unnamed       unused   input  active-high
         line   6:      unnamed       unused   input  active-high
         line   7:      unnamed       unused   input  active-high
         line   8:      unnamed       unused   input  active-high
         line   9:      unnamed       unused   input  active-high
         line  10:      unnamed       unused   input  active-high
         line  11:      unnamed       unused   input  active-high
         line  12:      unnamed       unused   input  active-high
         line  13:      unnamed       unused   input  active-high
         line  14:      unnamed       unused   input  active-high
         line  15:      unnamed       unused   input  active-high
         line  16:      unnamed       unused   input  active-high
         line  17:      unnamed       unused   input  active-high
         line  18:      unnamed       unused   input  active-high
         line  19:      unnamed       unused  output  active-high
         line  20:      unnamed       unused   input  active-high
         line  21:      unnamed       unused   input  active-high
         line  22:      unnamed       unused   input  active-high
         line  23:      unnamed       unused   input  active-high
         line  24:      unnamed       unused   input  active-high
         line  25:      unnamed       unused   input  active-high
         line  26:      unnamed       unused   input  active-high
         line  27:      unnamed       unused   input  active-high
         line  28:      unnamed       unused   input  active-high
         line  29:      unnamed       unused   input  active-high
         line  30:      unnamed       unused   input  active-high
         line  31:      unnamed       unused   input  active-high
         line  32:      unnamed       unused   input  active-high
         line  33:      unnamed       unused   input  active-high
         line  34:      unnamed       unused   input  active-high
         line  35:      unnamed       unused   input  active-high
         line  36:      unnamed       unused   input  active-high
         line  37:      unnamed       unused   input  active-high
         line  38:      unnamed       unused   input  active-high
         line  39:      unnamed       unused   input  active-high
         line  40:      unnamed       unused   input  active-high
         line  41:      unnamed       unused   input  active-high
         line  42:      unnamed       unused   input  active-high
         line  43:      unnamed       unused   input  active-high
         line  44:      unnamed       unused   input  active-high
         line  45:      unnamed       unused   input  active-high
         line  46:      unnamed       unused   input  active-high
         line  47:      unnamed       unused   input  active-high
         line  48:      unnamed       unused   input  active-high
         line  49:      unnamed "am62-sk:green:heartbeat_none" output 
active-high [used]
         line  50:      unnamed       unused   input  active-high
         line  51:      unnamed       unused   input  active-high
gpiochip2 - 24 lines:
         line   0: "GPIO_CPSW2_RST" unused input active-high
         line   1: "GPIO_CPSW1_RST" unused input active-high
         line   2: "PRU_DETECT"       unused   input  active-high
         line   3: "MMC1_SD_EN" "regulator-3" output active-high [used]
         line   4: "VPP_LDO_EN"       unused   input  active-high
         line   5: "EXP_PS_3V3_En" unused input active-high
         line   6: "EXP_PS_5V0_En" unused input active-high
         line   7: "EXP_HAT_DETECT" unused input active-high
         line   8: "GPIO_AUD_RSTn" unused input active-high
         line   9: "GPIO_eMMC_RSTn" unused input active-high
         line  10: "UART1_FET_BUF_EN" unused input active-high
         line  11:   "WL_LT_EN"       unused   input  active-high
         line  12: "GPIO_HDMI_RSTn" unused input active-high
         line  13:  "CSI_GPIO1"       unused   input  active-high
         line  14:  "CSI_GPIO2"       unused   input  active-high
         line  15: "PRU_3V3_EN"       unused   input  active-high
         line  16:  "HDMI_INTn"  "interrupt"   input  active-high [used]
         line  17: "PD_I2C_IRQ"       unused   input  active-high
         line  18: "MCASP1_FET_EN" unused input active-high
         line  19: "MCASP1_BUF_BT_EN" unused input active-high
         line  20: "MCASP1_FET_SEL" unused output active-high
         line  21: "UART1_FET_SEL" unused input active-high
         line  22:     "TSINT#"       unused   input  active-high
         line  23: "IO_EXP_TEST_LED" unused input active-high root@am62xx-evm:~#




root@am62xx-evm:~# gpioset gpiochip1 19=0 root@am62xx-evm:~# gpioinfo
gpiochip0 - 92 lines:
         line   0:      unnamed       unused   input  active-high
         line   1:      unnamed       unused   input  active-high
         line   2:      unnamed       unused   input  active-high
         line   3:      unnamed       unused   input  active-high
         line   4:      unnamed       unused   input  active-high
         line   5:      unnamed       unused   input  active-high
         line   6:      unnamed       unused   input  active-high
         line   7:      unnamed       unused   input  active-high
         line   8:      unnamed       unused   input  active-high
         line   9:      unnamed       unused   input  active-high
         line  10:      unnamed       unused   input  active-high
         line  11:      unnamed       unused   input  active-high
         line  12:      unnamed       unused   input  active-high
         line  13:      unnamed       unused   input  active-high
         line  14:      unnamed       unused   input  active-high
         line  15:      unnamed       unused   input  active-high
         line  16:      unnamed       unused   input  active-high
         line  17:      unnamed       unused   input  active-high
         line  18:      unnamed       unused   input  active-high
         line  19:      unnamed       unused   input  active-high
         line  20:      unnamed       unused  output  active-high
         line  21:      unnamed       unused   input  active-high
         line  22:      unnamed       unused   input  active-high
         line  23:      unnamed       unused   input  active-high
         line  24:      unnamed       unused   input  active-high
         line  25:      unnamed       unused   input  active-high
         line  26:      unnamed       unused   input  active-high
         line  27:      unnamed       unused   input  active-high
         line  28:      unnamed       unused   input  active-high
         line  29:      unnamed       unused   input  active-high
         line  30:      unnamed       unused   input  active-high
         line  31:      unnamed   "tlv71033"  output  active-high [used]
         line  32:      unnamed       unused   input  active-high
         line  33:      unnamed       unused   input  active-high
         line  34:      unnamed       unused   input  active-high
         line  35:      unnamed       unused   input  active-high
         line  36:      unnamed       unused   input  active-high
         line  37:      unnamed       unused   input  active-high
         line  38:      unnamed       unused   input  active-high
         line  39:      unnamed       unused   input  active-high
         line  40:      unnamed       unused   input  active-high
         line  41:      unnamed       unused   input  active-high
         line  42:      unnamed       unused   input  active-high
         line  43:      unnamed       unused   input  active-high
         line  44:      unnamed       unused   input  active-high
         line  45:      unnamed       unused   input  active-high
         line  46:      unnamed       unused   input  active-high
         line  47:      unnamed       unused   input  active-high
         line  48:      unnamed       unused   input  active-high
         line  49:      unnamed       unused   input  active-high
         line  50:      unnamed       unused   input  active-high
         line  51:      unnamed       unused   input  active-high
         line  52:      unnamed       unused   input  active-high
         line  53:      unnamed       unused   input  active-high
         line  54:      unnamed       unused   input  active-high
         line  55:      unnamed       unused   input  active-high
         line  56:      unnamed       unused   input  active-high
         line  57:      unnamed       unused   input  active-high
         line  58:      unnamed       unused   input  active-high
         line  59:      unnamed       unused   input  active-high
         line  60:      unnamed       unused   input  active-high
         line  61:      unnamed       unused   input  active-high
         line  62:      unnamed       unused   input  active-high
         line  63:      unnamed       unused   input  active-high
         line  64:      unnamed       unused   input  active-high
         line  65:      unnamed       unused   input  active-high
         line  66:      unnamed       unused   input  active-high
         line  67:      unnamed       unused   input  active-high
         line  68:      unnamed       unused   input  active-high
         line  69:      unnamed       unused   input  active-high
         line  70:      unnamed       unused   input  active-high
         line  71:      unnamed       unused   input  active-high
         line  72:      unnamed       unused   input  active-high
         line  73:      unnamed       unused   input  active-high
         line  74:      unnamed       unused   input  active-high
         line  75:      unnamed       unused   input  active-high
         line  76:      unnamed       unused   input  active-high
         line  77:      unnamed       unused   input  active-high
         line  78:      unnamed       unused   input  active-high
         line  79:      unnamed       unused   input  active-high
         line  80:      unnamed       unused   input  active-high
         line  81:      unnamed       unused   input  active-high
         line  82:      unnamed       unused   input  active-high
         line  83:      unnamed       unused   input  active-high
         line  84:      unnamed       unused   input  active-high
         line  85:      unnamed       unused   input  active-high
         line  86:      unnamed       unused   input  active-high
         line  87:      unnamed       unused   input  active-high
         line  88:      unnamed       unused   input  active-high
         line  89:      unnamed       unused   input  active-high
         line  90:      unnamed       unused   input  active-high
         line  91:      unnamed       unused   input  active-high
gpiochip1 - 52 lines:
         line   0:      unnamed       unused   input  active-high
         line   1:      unnamed       unused   input  active-high
         line   2:      unnamed       unused   input  active-high
         line   3:      unnamed       unused   input  active-high
         line   4:      unnamed       unused   input  active-high
         line   5:      unnamed       unused   input  active-high
         line   6:      unnamed       unused   input  active-high
         line   7:      unnamed       unused   input  active-high
         line   8:      unnamed       unused   input  active-high
         line   9:      unnamed       unused   input  active-high
         line  10:      unnamed       unused   input  active-high
         line  11:      unnamed       unused   input  active-high
         line  12:      unnamed       unused   input  active-high
         line  13:      unnamed       unused   input  active-high
         line  14:      unnamed       unused   input  active-high
         line  15:      unnamed       unused   input  active-high
         line  16:      unnamed       unused   input  active-high
         line  17:      unnamed       unused   input  active-high
         line  18:      unnamed       unused   input  active-high
         line  19:      unnamed       unused  output  active-high
         line  20:      unnamed       unused   input  active-high
         line  21:      unnamed       unused   input  active-high
         line  22:      unnamed       unused   input  active-high
         line  23:      unnamed       unused   input  active-high
         line  24:      unnamed       unused   input  active-high
         line  25:      unnamed       unused   input  active-high
         line  26:      unnamed       unused   input  active-high
         line  27:      unnamed       unused   input  active-high
         line  28:      unnamed       unused   input  active-high
         line  29:      unnamed       unused   input  active-high
         line  30:      unnamed       unused   input  active-high
         line  31:      unnamed       unused   input  active-high
         line  32:      unnamed       unused   input  active-high
         line  33:      unnamed       unused   input  active-high
         line  34:      unnamed       unused   input  active-high
         line  35:      unnamed       unused   input  active-high
         line  36:      unnamed       unused   input  active-high
         line  37:      unnamed       unused   input  active-high
         line  38:      unnamed       unused   input  active-high
         line  39:      unnamed       unused   input  active-high
         line  40:      unnamed       unused   input  active-high
         line  41:      unnamed       unused   input  active-high
         line  42:      unnamed       unused   input  active-high
         line  43:      unnamed       unused   input  active-high
         line  44:      unnamed       unused   input  active-high
         line  45:      unnamed       unused   input  active-high
         line  46:      unnamed       unused   input  active-high
         line  47:      unnamed       unused   input  active-high
         line  48:      unnamed       unused   input  active-high
         line  49:      unnamed "am62-sk:green:heartbeat_none" output 
active-high [used]
         line  50:      unnamed       unused   input  active-high
         line  51:      unnamed       unused   input  active-high
gpiochip2 - 24 lines:
         line   0: "GPIO_CPSW2_RST" unused input active-high
         line   1: "GPIO_CPSW1_RST" unused input active-high
         line   2: "PRU_DETECT"       unused   input  active-high
         line   3: "MMC1_SD_EN" "regulator-3" output active-high [used]
         line   4: "VPP_LDO_EN"       unused   input  active-high
         line   5: "EXP_PS_3V3_En" unused input active-high
         line   6: "EXP_PS_5V0_En" unused input active-high
         line   7: "EXP_HAT_DETECT" unused input active-high
         line   8: "GPIO_AUD_RSTn" unused input active-high
         line   9: "GPIO_eMMC_RSTn" unused input active-high
         line  10: "UART1_FET_BUF_EN" unused input active-high
         line  11:   "WL_LT_EN"       unused   input  active-high
         line  12: "GPIO_HDMI_RSTn" unused input active-high
         line  13:  "CSI_GPIO1"       unused   input  active-high
         line  14:  "CSI_GPIO2"       unused   input  active-high
         line  15: "PRU_3V3_EN"       unused   input  active-high
         line  16:  "HDMI_INTn"  "interrupt"   input  active-high [used]
         line  17: "PD_I2C_IRQ"       unused   input  active-high
         line  18: "MCASP1_FET_EN" unused input active-high
         line  19: "MCASP1_BUF_BT_EN" unused input active-high
         line  20: "MCASP1_FET_SEL" unused output active-high
         line  21: "UART1_FET_SEL" unused input active-high
         line  22:     "TSINT#"       unused   input  active-high
         line  23: "IO_EXP_TEST_LED" unused input active-high root@am62xx-evm:~#



/* These are the commands for the toggling but in the software it is not updating


root@am62xx-evm:~# sudo echo 0 > /sys/class/gpio/gpio417/value root@am62xx-evm:~# root@am62xx-evm:~# clear

root@am62xx-evm:~# sudo echo 1 > /sys/class/gpio/gpio417/value root@am62xx-evm:~# cat /sys/class/gpio/gpio417/value
0
root@am62xx-evm:~# sudo echo 1 > /sys/class/gpio/gpio383/value root@am62xx-evm:~# sudo echo 1 > /sys/class/gpio/gpio384/value root@am62xx-evm:~# sudo echo 1 > /sys/class/gpio/gpio385/value root@am62xx-evm:~# sudo echo 1 > /sys/class/gpio/gpio386/value root@am62xx-evm:~# sudo echo 1 > /sys/class/gpio/gpio387/value root@am62xx-evm:~# cat /sys/class/gpio/gpio383/value
0
root@am62xx-evm:~# cat /sys/class/gpio/gpio384/value
0
root@am62xx-evm:~# cat /sys/class/gpio/gpio385/value
0
root@am62xx-evm:~# cat /sys/class/gpio/gpio386/value
0
root@am62xx-evm:~# cat /sys/class/gpio/gpio387/value


/*The output value not changing after the changing of value to 1 of each gpio pin . it is not updating*/

  • 0 in reply to raj kumar
    TI__Genius 12040 points

    Hi Raj,

    raj kumar said:
    we’re seeing a discrepancy in the software, as the GPIO states are not updating accordingly.

    How was the gpio number calculated for the sysfs commands?

    raj kumar said:
    In addition, we are unable to locate the SPI device under the /dev directory. Could you provide instructions on enabling SPI functionality on the AM62x E3 evaluation board, including any necessary kernel module configurations or device tree adjustments

    Please create separate E2E thread for this item. If you search through the E2E forums, there are examples on how to do this.

    Best Regards,

    Anshu