AM67: AM67 SDK 10.0.1 gpio readback issue

Hello,

Can you make sure that corresponding pinmux is set to 0x40007…

Best Regards,

Keerthy 

Hi, Keerthy,

my config is below:

J722S_IOPAD(0x007c, PIN_OUTPUT_PULLUP, 7) /*  (T23) GPMC0_CLK.GPIO0_31  */

how to set to 0x40007?

Hi Keerthy,

    I change to PIN_INPUT, 

J722S_IOPAD(0x007c, PIN_INPUT, 7) /* (T23) GPMC0_CLK.GPIO0_31  */

but when run the below command:

root@~# gpioset 0 31=1

root@~# gpioget 0 31

I measure gpio0_31 voltage value, it is 0.9V also.

Please double check the pinmux register value by using:

devmem2 reg_addr w

Best Regards,

Keerthy 

Keerthy，

    Not find RX_ACTIVE description, can you give address of gpio0_31? thanks

Keerthy，

    I test this issue on your am67 evm, SDK 10.0.1. I setup USER_LED2 gpio to 1, gpioset -c 1 16=1, I measure gpio voltage value, it is 3.3V, when I run gpioget -c 1 16, I measure gpio voltage value, it is 1.9V.

    can you test it on your am67 evm?

    Thank

Okay. I will and try and get back to you.

Best Regards,

Keerthy 

Hi,

user5152479 said:

J722S_IOPAD(0x007c, PIN_OUTPUT_PULLUP, 7) /*  (T23) GPMC0_CLK.GPIO0_31  */

I directly used:

devmem2 0x000F407C w 0x40007 /* To set the pinmux register to config T32 pin to GPIO0_31 */
devmem2 0x600010 w 0x7FFFFFFF /* To set the GPIO_DIR01 Register to Output for GPIO0_31 Bit31 is set to 0 for Output */
devmem2 0x600014 w 0x80000000 /* To set the GPIO_OUT_DATA01 Register to Output 1 for GPIO0_31 Bit31 is set to 1 for Output */

I can see that state is toggled. Are you saying that voltage levels when measure on the scope are not right? I can loop in hardware experts if you confirm the same.

user5152479 said:

I setup USER_LED2 gpio to 1, gpioset -c 1 16=1, I measure gpio voltage value, it is 3.3V, when I run gpioget -c 1 16, I measure gpio voltage value, it is 1.9V.

This is a different GPIO and it goes via I2C expander & will not need pinmux for this.

- Keerthy

Keerthy,

    yes, I measure on the scope are not righ. it is 0.9V only

I'm not sure which version of the J722S board you are using (PROC170E?), but there is a design error on the EVM.  The issue is the mux U12 is powered from a 3.3V source, but should be a 5V source.  On most systems we see mux works, but a high voltage on the IO is less than 3.3V (usually about 2.4V).  Below is the modification need to resolve the issue: