Coastal Groins and Nearshore Breakwaters (Technical by US Army Corps of Engineers, ASCE

By US Army Corps of Engineers, ASCE

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Extra resources for Coastal Groins and Nearshore Breakwaters (Technical Engineering and Design Guides As Adapted from the Us Army Corps of Engineers, No 6)

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3 of the USB Specification[1] enables us to decode what is meant by the setup data. The second byte is 06H which can be decoded as a "GET DESCRIPTOR" request, and so on. The last word (2-byte) is 0080H which is the expected length of the packets that the device is required to send in the data stage (data stage exists if this word is not OOOOH). This is the setup stage for a control transfer. The device, after the correct reception of this setup data, issues an ACK handshake packet (packet #182) immediately.

2 Application-Specific Firmware Application-specific firmware for the device will require some minor changes. For example, if the microcontroller is used in a USB keyboard, it is still required to scan the keyboard and encode the data when a key is pressed. However, after encoding the data, the microcontroller is required to transfer the data to its transmit FIFO to get ready for 49 Firmware Relationship with Device Class Driver transmission through the USB wires. For the ease of debugging, you can develop the firmware in two separate modules initially; one for USB-related routines and the other for application-specific routines.

The 8x930Ax is based on a MCS 251 core, and has various on-chip peripherals (an industrial standard MCS 51 Universal Asynchronous Receiver and Transmitter (UART), 5 modules of programmable counter arrays (PCA), 3 general purpose timers/counters, a hardware watchdog timer) and a USB module. It is available in various ROM and RAM sizes as shown in Figure 4-1. Part Name ROM size (bytes) RAM size (bytes) 80930AD 0 1K 83930AD 83930AE 8K 16K 1K 1K Figure 4-1. 1 MCS 251 Core The MCS 251 core is considered to be the next generation core of the MCS 51 8-bit core that has been widely used for over 15 years.

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