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| HT46RB50 Thermonmeter HT46RB50 Thermometer D/NHA0107E Introduction This thermometer project uses the HT46RB50 microcontroller. One of the HT46RB50 A/D inputs is connected to an external thermistor. The internal AD can read the voltage due to the changing resistance on the thermistor and with suitable conversion the outside temperature can be determined. The project xxx control system provided USB HID device type driver subroutine. * Uses USB control for transmission of data to the HT46RB50 * Uses the USB interrupt to transmit and receive data to and from the HT46RB50 1 HT46RB50 Thermonmeter Application Circuit PC Display Interface T h e rm o n m e te r C e n tig r a d e F a h r e n h e it O pen In te rru p t A ccept C lo s e 2 HT46RB50 Thermonmeter File Explanation * MACRO.H This main file defines the engineering variables, common measurements and the macro definitions INITIATE.ASM This ASM file controls the register intialisation USB_ISR.ASM This ASM file is the USB interrupt service subroutine, when a USB interrupt occurs, the program will jump here USB_LIB.ASM This ASM file contains the read/write subroutines for the FIFO STANDARD_REQUEST.ASM This ASM file contains the 11 standard USB defined standard driver requests subroutine CLASS_REQUEST.ASM This ASM file contains the HID request subroutines DESCRIPTOR.ASM This ASM file contains the descriptor definitions INTERRUPT.ASM This ASM file contains the AD converter interrupt service routine and the TMR service routine * * * * * * * Control Display Interface * Open * Open the USB device Accept Accept the USB device data. Before accepting data ensure that the USB device is opened. Cut Close the USB device Close Close the display interface Centigrade Display the previous temperature, in Centigrade Fahrenheit Display the previous temperature, in Fahrenheit Status Bar Display the USB previous state 3 * * * * * |
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