This article mainly introduced the world's first MYEL-JA5D27 based on Atmel's latest series of MPU SAMA5D27 development board, which was independently evaluated by MYD-JA5D27 development board in appearance, hardware, core board and application. Compared with the classic processor ARM9/ARM11, the ARM Cortex-A5 processor-based SAMA5D27 features high performance and low power consumption, making it ideal for cost-sensitive industrial embedded applications including home and automation, consumer medical devices, Printers, smart charging systems, smart vending machines, weighing systems, educational terminals, automotive control and IOT applications. Follow the specific Xiao Bian together to find out. The following figure shows the packaging of the MYD-JA5D27 development board to be introduced today. It is concise and atmospheric. There is a development kit specific model on the side of the box Internal parts list A MYD-JA5D27 development board wrapped with an electrostatic bag, a network cable, a miniUSB cable, a serial cable, and a power adapter are packaged. The specification of the power adapter is 5V/2A, and the power supply of the industrial control board obtained from Mirtech is basically 5V or 12V. MYD-JA5D27 board real board, board workmanship is very solid, including the peripheral expansion board MYB-JA5D2X and the core board MYC-JA5D2, from the named way can also see that Mills technology is very particular about their products, D should equal Development, That is, the development board; B should be the Board, the backplane; and C is the Core, on behalf of the core board, from the naming mode to the user at a glance. Among the development kits, the backplane is MYB-JA5D2X, which means that it can be compatible with different core boards. Users can select the corresponding core board according to their own needs. In addition, the board's resources are basically distributed in the front, no components on the back, but it leads to an FMC interface (parallel bus interface), which is the signal line of the core board, this detail is very good, once the core board what Problems that make it easy for users to test and locate problems. The backplane and the core board are connected via a 200-pin DIMM gold finger interface, which can be easily removed. However, when connecting, the core board and backplane are also fixed by fixed screws for details of the reliability of the entire board connection. Very thoughtful. The backplane adopts 5V DC power supply and extends the LCD, camera, USB, Ethernet, audio, TF card, RS485, RS232, CAN, RTC, IO extended function interfaces. MYD-JA5D27 has a very rich interface resources, the specific distribution as shown below. To see the details of the board interface, the following series of presentations are from left to right: A debug serial port (DB9), a 3-wire RS232 serial port (DB9), a 10/100M Ethernet port, a miniUSB HOST/Device interface, and a 5V DC JACK power supply interface. Power switch, switch through the switch USB power supply or DC JACK power supply; all the way RS485 interface (green), a CAN interface (green), audio Line IN / headphone jack (onboard a mic input), a 20PIN JTAG debug interface (2.54 Mm pitch). One button battery holder; USB HOST interface, MicroSD card connector, 4 expansion interfaces (including 8-bit camera interface, IO ports such as SPI, UART, I2C, and QSPI) 3 LEDs, including a power indicator, two user Led; 4 mechanical keys, including boot selection, reset, wake-up, user-defined functions; an 18-bit LCD interface. Therefore, the hardware block diagram of the entire MYD-JA5D27 development board is as follows. The MYC-JA5D27 core board is based on Atmel's ATSAMA5D27 microprocessor. The board uses an 8-layer board design, a gold-immersed process, and a separate, complete ground plane with a size of only 67.6 mm x 45 mm, almost the size of a credit card. The core board contains three types of clock designs, which are the CPU's 12-MHz master clock, the RTC's 32.768-kHz clock, and the Ethernet PHY's 25-MHz clock. The specific resource distribution of MYC-JA5D27 is shown in the figure below. From the actual circuit, it can be seen that the core board only needs to supply 3.3V power and RTC power to work, and it can directly connect the RTC power supply to the 3.3V power supply when RTC is not needed. In addition, we can also see that the core board does not use the integrated PMU power supply method, but instead designs a discrete power supply solution. The purpose of doing so may be to consider more competitive price factors. The core board microprocessor ATSAMA5D27 is based on an energy-efficient ARM Cortex-A5 processor with an operating frequency of 500MHz. The chip supports DDR3, LPDDR3 memory, etc. The integrated LCD controller, Touch controller, audio, camera interface, EMAC, USB , Dual CAN and up to 10 UARTs and other rich peripheral resources. At the same time, ATSAMA5D27 also provides advanced security features to protect user code and external data transmission security. Hardware Block Diagram for ATSAMA5D MPU The MYD-JA5D27 is shipped with a simplified version of Linux, so it can be used right out of the box. In addition, the MYD-JA5D27 development board supports the Linux 4.1 system and provides user manuals, backplane schematics, external expansion interface drivers, BSP source packages, and development tools. Provide developers with a complete software development environment, reduce product development cycles, and achieve rapid time to market. Since there is no LCD screen on hand, the serial port of the development board is the interface of DB9. The notebook I used earlier does not have this interface, so the Unbuntu system on the desktop is used as the serial output host, and the serial port printing tool minicom is configured and configured accordingly. Parameters can be. Power on, first load the bootloader AT91Bootstrap, the secondary bootloader u-boot, and then load the Linux kernel. The default password for entering the system is root. The default network port of the development board is not open and needs to be manually activated. Add the development board to the same local area network on the PC to allow mutual access. The development board provides source code for a number of applications that we can test directly. Especially for the routine code, basically Mir Technologies has formed its own set of methods. It can be said that it basically satisfies the functional testing requirements, but it is also limited to these, and more optimizations need to be completed by users themselves. Here is the lossless wav format music played through the wm8904 audio codec on the board.
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