UART2 Linux application mode is not working

1

Hi all,

i am facing an issue with UART2 in application mode , Once i enable uart 2 for application mode, ttyHSL1 is coming as disabled (checked by dmesg | grep tty). While running the app it reporting the below mentioned error

Jan 6 05:49:27 swi-mdm9x28-wp user.err Legato: =ERR= | supervisor[859]/supervisor T=main | app.c GetDevID() 670 | Could not get file info for ‘/dev/ttyHSL1’. No such file or directory.

Jan 6 05:49:27 swi-mdm9x28-wp user.err Legato: =ERR= | supervisor[859]/supervisor T=main | app.c SetCfgDevicePermissions() 775 | Failed to set permissions (rw) for app ‘rs232app_test’ on device ‘/dev/ttyHSL1’.

Jan 6 05:49:27 swi-mdm9x28-wp user.err Legato: =ERR= | supervisor[859]/supervisor T=main | app.c app_Start() 3452 | Failed to set Smack rules or set up app area.

Please suggest a solution to overcome this issue, Thanks in advance

Regards,

Arun

2

Can you attach your app here?
What module and fw ate you using?
Have yoh tried unsandbox the app?

BTW, have you set the AT!MAPUART=17,2 so that UART2 can be used in linux app?
once you set this, after reset, you should not see /dev/ttyHSL1

3

Hi,

Please find the code snipped below

void* Modbus_Reading_Thread(void* object)
{
int res = 0;

LE_INFO("MODBUS Thread Started");

while(1)
{
    res = read(Serial_Port_fd,&Rx_Buffer[Rx_count],RX_RS485_SIZE-2);
   

    if(res)
    {
        Rx_count += res;
        Byte_Recv = 1;
        byteTimeout = BYTE_TO_BYTE_TIMEOUT;
        
        if(Rx_count > (RX_RS485_SIZE-2))						/* Buffer overflow checking in case of junk receiving */
        {
            Rx_count = 0;
        }
    }
}

}

/*

  • Serial Port Initialization Program

============================================================================================
*/

void Serial_Driver_Port()
{

Serial_Port_fd = open(“/dev/ttyHSL1”, O_RDWR | O_NOCTTY | O_NDELAY);

if (Serial_Port_fd == -1)
{
/*
* Could not open the port.
*/

LE_ERROR("open_port: Unable to open /dev/ttyHSL1 - ");

}
else
{
fcntl(Serial_Port_fd, F_SETFL, 0);

le_tty_SetRaw(Serial_Port_fd, 0, 0);	//ECHO is OFF

le_tty_SetFraming(Serial_Port_fd, 'N', 8, 1);

pthread_create(&MODBUS_Read_Thread_ID, (pthread_attr_t*)(0), &Modbus_Reading_Thread, (void*)(0));

sleep(1);

LE_INFO("COM PORT HSL1 Opened");

}
}

.cdef file

// Linux filesystem device paths.
device:
{
    // Get read and write access to the UART1 port.
    [rw]    /dev/ttyHSL1   /dev/ttyHSL1
}

in .adef file

sandbox : false

I used uartMode set 2 app command for setting application mode, after system restart HSL1 disabled is coming in dmesg, while using uartMode get 2 command reports linux application

4

once you set AT!MAPUART=17,2 , after reset, you should not see /dev/ttyHSL1

5

Hi,
I performed the AT command set, and restarted , it showing as below

root@swi-mdm9x28-wp:~# dmesg | grep tty
[ 0.000000] Kernel command line: console=ttyHSL0,115200 console=ttyHSL1,115200 root=/dev/ram rootfs_ro=true user1_fs=ubifs verity=on ima_ready=0 lkversion=SWI9X07Y_02.28.03.03 androidboot.serialno=5c5d67dd androidboot.authorized_kernel=true quiet androidboot.baseband=msm rootfstype=ubifs rootflags=bulk_read
[ 0.660730] ttyHS0 is reserved for AT service.
[ 0.663953] 78b0000.uart: ttyHS0 at MMIO 0x78b0000 (irq = 49, base_baud = 460800) is a MSM HS UART
[ 0.666305] ttyHS1 could be used as generic serial port.
[ 0.669063] 78af000.uart: ttyHS1 at MMIO 0x78af000 (irq = 48, base_baud = 460800) is a MSM HS UART
[ 0.671868] ttyHSL1 is disabled.
[ 0.672155] ttyHSL0 is disabled.

i have to use ttyHS1 for my application?

6

Hi,

Thanks for the support its working as expected, please find the working code sample below

/*

  • Receive MODBUS Packet Program

============================================================================================
*/

void* Modbus_Reading_Thread(void* object)
{
int res = 0;

uint8_t  temp_buf[RX_RS485_SIZE] = {0};

LE_INFO("MODBUS Thread Started");

while(1)
{
    res = read(Serial_Port_fd,temp_buf,RX_RS485_SIZE-2);
    
    if(res > 0)
    {
		if((Rx_count + res) > (RX_RS485_SIZE-2))
			Rx_count = 0;

		memcpy(&Rx_Buffer[Rx_count],temp_buf,res);

		Rx_count += res;
	
        Byte_Recv = 1;
        byteTimeout = BYTE_TO_BYTE_TIMEOUT;
        
        if(Rx_count > (RX_RS485_SIZE-2))						/* Buffer overflow checking in case of junk receiving */
        {
            Rx_count = 0;
        }
    }
}

}

/*

  • Serial Port Initialization Program

============================================================================================
*/

void Serial_Driver_Port()
{

Serial_Port_fd = open(“/dev/ttyHS1”, O_RDWR | O_NOCTTY | O_NDELAY);

if (Serial_Port_fd == -1)
{
/*
* Could not open the port.
*/

LE_ERROR("open_port: Unable to open /dev/ttyHS1 - ");

}
else
{
fcntl(Serial_Port_fd, F_SETFL, 0);

le_tty_SetBaudRate(Serial_Port_fd,LE_TTY_SPEED_19200);

le_tty_SetRaw(Serial_Port_fd, 0, 0);	//ECHO is OFF

le_tty_SetFraming(Serial_Port_fd, 'N', 8, 1);

pthread_create(&MODBUS_Read_Thread_ID, (pthread_attr_t*)(0), &Modbus_Reading_Thread, (void*)(0));

sleep(1);

LE_INFO("COM PORT HSL1 Opened");

}
}

in .cdef file

// Linux filesystem device paths.
device:
{
    // Get read and write access to the UART1 port.
    [rw]    /dev/ttyHS1   /dev/ttyHS1
}