The Design Of USB Host And Human-machine Interface In Loom's Embedded Control System

With the rapid development of the Embedded Technology,its application was widely promoted in a great many fields. In the condition that the level of mechatronics in textile machinery was enhanced prodigiously, it's a good choice to introduce the Embedded Technology into the primary control system to improve the performance. So the means of seting up USB host to storage the loom data and make a new human-machine interface was put forward. The USB host supports the writing and reading operation on flash, while the human-machine interface platform based on embedded operation system and embedded GUI provideing many library functions to make the screen preparing more easier. This design includes these parts as below:First, on understanding the agreement of the USB communication, the means based on ISP1160 was choosen. ISP1160 follows the rule of USB 2.0 and has function registers to make it work. As the USB host, the initialization of the ISP1160, the function of USB communication, the enumeration of the USB device are necessary. To support flash device, there should be Mass Storage function and document system of FAT16.Second, the hardware system of the human-machine interface based on S3C44b0X which includes external circuit of the core, memory circuit, JTAG interface, LCD interface, touchscreen interface and UART interface was setup.Third, theμC/OS-II andμC/GUI were choosen and transplanted in the hardware system of S3C44b0X. This proceed included programming a LCD driver, a Chinese characters store, a touchscreen driver and overwriting some configuration files.Fourth, three tasks includes displaying, touchscreen, UART communication were created while code flag was provided by the operation system to carry out scheduling of the tasks. Then, using the function interface of theμC/GUI, 17 screens displaying parament watching and configuration were prgrammed and switched in callback rule.