Other Parts Discussed in Thread: MMWCAS-RF-EVM
Hello,
I'd like to monitor the EXT_DIG_SYNC signal from the MMWCAS-RF-EVM board. The rising edge of this signal indicates the start of a frame, and I understand that it's also routed to the MMWCAS-DSP-EVM board and connected to GPIO7_27.
My plan is to use the Sysfs functionality in linux on the A-15 ARM chip on the MMWCAS-DSP-EVM board. However, the listing at /sys/class/gpio does not contain a directory for this bank of GPIO pins.
Output of ls command:
root@dra7xx-evm:~# ls -l /sys/class/gpio
total 0
--w------- 1 root root 4096 Mar 27 14:48 export
lrwxrwxrwx 1 root root 0 May 13 2019 gpiochip0 -> ../../devices/platform/44000000.ocp/4ae10000.gpio/gpio/gpiochip0
lrwxrwxrwx 1 root root 0 May 13 2019 gpiochip128 -> ../../devices/platform/44000000.ocp/48053000.gpio/gpio/gpiochip128
lrwxrwxrwx 1 root root 0 May 13 2019 gpiochip32 -> ../../devices/platform/44000000.ocp/48057000.gpio/gpio/gpiochip32
lrwxrwxrwx 1 root root 0 May 13 2019 gpiochip494 -> ../../devices/platform/44000000.ocp/48070000.i2c/i2c-0/0-0076/gpio/gpiochip494
lrwxrwxrwx 1 root root 0 May 13 2019 gpiochip510 -> ../../devices/platform/44000000.ocp/50000000.gpmc/gpio/gpiochip510
lrwxrwxrwx 1 root root 0 May 13 2019 gpiochip64 -> ../../devices/platform/44000000.ocp/48059000.gpio/gpio/gpiochip64
lrwxrwxrwx 1 root root 0 May 13 2019 gpiochip96 -> ../../devices/platform/44000000.ocp/4805d000.gpio/gpio/gpiochip96
--w------- 1 root root 4096 Mar 27 14:48 unexport
GPIO7_27 is bank 7 which would be "gpiochip192", correct? I don't see an entry in /sys/class/gpio for that bank.
How should I configure the system to get access to GPIO7_27 (pin 219) via the Sysfs functionality?
Thank you,
Patrick
