Periplex GPIO pin configuration issue

[Shubh150]

I had used the periplex-sync -p .json command on the following json file :-

{
    "uart": [
        {
            "id": 0,
            "TX": "GPIOT_RXP28",
            "RX": "GPIOT_RXN28"
        }
    ],
    "i2c": [],

    "gpio": [
        {
            "id": 1,
            "GPIO-0": "GPIOR_168",
            "GPIO-1": "GPIOL_17",
            "GPIO-2": "GPIOL_20",
            "GPIO-3": "GPIOL_18",
            "GPIO-4": "GPIOR_187",
            "GPIO-5": "GPIOL_24",
            "GPIO-6": "GPIOL_66",
            "GPIO-7": "GPIOL_62"
        }
    ],
    "pwm": [],
    "ws": [],
    "spi":[],
    "onewire": [],
    "can": [],
    "i2s": []
}

The operation was successful and I then proceeded to reboot the device.
But after reboot, when I ran the ls /dev command, it didn’t show any activated pins for UART or GPIO.
What could have possibly gone wrong. Please help!

[vatsal]

you can see ttyPERI0 and gpiochip6 are created using the periplex, this type of information will provide coming soon in the docs of periplex.

[Shubh150]

Ok, so are you saying that peripherals get created and not highlighted once we configure the .json file? And the gpiochip6 and ttyPERI0 peripherals were not initialized beforehand?

[Shubh150]

I am using the following code to transmit data from Vaaman to a Serial Monitor on my PC using an TTL to USB converter (FTDI Module) :-

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#include <string.h>

int main() {
    int uart_fd;
    struct termios options;

    // Open the UART device (ttyS0)
    uart_fd = open("/dev/ttyPERI0", O_RDWR | O_NOCTTY | O_NDELAY);
    if (uart_fd == -1) {
        perror("Error opening UART");
        return -1;
    }

    // Configure UART settings
    tcgetattr(uart_fd, &options);
    cfsetispeed(&options, B115200); // Set baud rate to 115200
    cfsetospeed(&options, B115200);
    options.c_cflag |= (CLOCAL | CREAD);
    options.c_cflag &= ~PARENB;  // No parity
    options.c_cflag &= ~CSTOPB;  // 1 stop bit
    options.c_cflag &= ~CSIZE;   
    options.c_cflag |= CS8;      // 8 data bits
    tcsetattr(uart_fd, TCSANOW, &options);
    while(1){
    // Send "hello world"
    char message[] = "hello world\n";
    int bytes_written = write(uart_fd, message, strlen(message));
    if (bytes_written < 0) {
        perror("Failed to write to UART");
    } else {
        printf("Sent: %s", message);
    }
    }
    

    // Close the UART device
    close(uart_fd);
    return 0;
}

The code runs successfully as depicted in the screenshot :-

But, am unable to receive data on the other end, What could be the issue here…

[vatsal]

Use the following command to store kernel logs in a file(dmesg.txt here).

sudo dmesg > dmesg.txt

Upload the same over here.