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FAQ for UC-7110

FAQ 1 Why can I only use vfork( ),and am unable to use fork( )?

Answer 1 uClinux only supports vfork( ). It does not support fork( ). Note that when using vfork( ), the parent process will hang until the son process calls an exec group API, or exits.

FAQ 2 When using a pthread group API, why can’t I use SIGUSR1 and SIGUSR2?

Answer 2 Since a pthread group API uses SIGUSR1 and SIGUSR2 to do a pthread control suspend, restart exit function, we cannot use the SIGUSR1 and SIGUSR2 signals. You will get the same result if you link the pthread. This means that you cannot use -1pthred to add an option to the linker.

FAQ 3 What is the correct format for linking to an AP?

Answer 3 arm-elf-gcc –W1, -elf2flt

(In this example, the AP converts elf format to flat format.)

FAQ 4 What stack size can I use when creating a user application?

Answer 4 First note that UC-7110 is not an MMU processor. The OS is uClinux, so you must transfer your application from ELF to FLAT format. The transfer utility (on the PC) assigns a stack size of 0x1000 by default. If your application needs a bigger stack size, you must use an option that specifies stack size when transferring the application from ELF to FLAT format. The following LDFLAGS shows how to write the stack size option:

LDFLAGS = -g,-Wl,-T,/usr/local/arm-elf/lib/elf2flt.ld -elf2flt= "-s 32768"

You can combine this with a compress option. E.g.:

LDFLAGS = -g,-Wl,-T,/usr/local/arm-elf/lib/elf2flt.ld -elf2flt= "-z –r -s 32768"

Refer to the next FAQ for compress options.

Keep in mind that the stack size must be indicated in decimal format. You cannot use hex format (i.e., numbers that begin with “0x”). The following LDFLAGS command will fail:

LDFLAGS = -g,-Wl,-T,/usr/local/arm-elf/lib/elf2flt.ld -elf2flt= "-s 0x2000"

Use the ‘flthdr’ utility (on a PC) to check the current stack size.

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Moxa Technologies user manual FAQ for UC-7110, Answer 3 arm-elf-gcc -W1, -elf2flt
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UC-7110 specifications

The Moxa Technologies UC-7110 is a powerful and versatile computing platform designed for industrial applications and IoT (Internet of Things) deployments. It represents a compelling solution for edge computing needs, with an emphasis on reliability, flexibility, and ease of integration. The UC-7110 offers a compact form factor, making it suitable for space-constrained environments while delivering robust performance.

One of the UC-7110's main features is its Intel Atom E3825 processor, which provides a balance of power efficiency and computational capability, ensuring it can handle the demands of data processing tasks at the edge. With 1GB of DDR3 RAM and support for up to 32GB of onboard eMMC storage, the UC-7110 can efficiently manage applications that require quick access to data without the need for extensive external storage devices.

The UC-7110 also stands out for its extensive connectivity options. It is equipped with multiple serial ports, digital input/output (DIO), USB ports, and Ethernet interfaces, allowing seamless integration with a wide range of industrial devices and protocols. This connectivity is crucial for real-time data acquisition and control in various industrial settings. The device also supports optional wireless communication modules, including LTE, Wi-Fi, and Bluetooth, enhancing its suitability for remote and mobile applications.

In terms of software capabilities, the UC-7110 operates on a Linux-based operating system, providing users with the flexibility to develop custom applications tailored to their specific needs. Moxa also provides the MXIO library, which simplifies the programming of input/output operations, making it easier for developers to create robust and responsive applications.

The UC-7110 is designed to endure harsh industrial environments, featuring wide operating temperature ranges from -40°C to 70°C and IP30-rated protection against dust and moisture. This ruggedness ensures reliable performance in challenging conditions, which is critical for industries such as manufacturing, transportation, and energy.

Additionally, the device supports various industrial protocols like Modbus, MQTT, and OPC UA, facilitating integration into existing systems and enabling efficient data communication across different platforms. This compatibility is vital for leveraging existing infrastructure while adopting modern IoT solutions.

In summary, the Moxa UC-7110 is a robust, versatile edge computing solution ideal for industrial IoT applications. Its combination of powerful processing, extensive connectivity options, software flexibility, and rugged design makes it a valuable asset for organizations seeking to enhance their operational efficiency and adapt to evolving technological demands. Whether in manufacturing, smart cities, or remote asset monitoring, the UC-7110 provides the necessary tools to unlock new possibilities in industrial connectivity and data management.
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