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AR1010-I/ML 数据表(PDF) 49 Page - Microchip Technology |
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AR1010-I/ML 数据表(HTML) 49 Page - Microchip Technology |
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49 / 70 page ![]() 2009-2012 Microchip Technology Inc. Preliminary DS41393B-page 49 AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER 1. Send the DISABLE_TOUCH (0x13) command. 2. Send the REGISTER_START_ADDRESS_REQUEST (0x22) to determine the absolute address for TouchOptions Register. 3. Send the REGISTER_WRITE (0x21) command to set the CCE bit of the TouchOptions Register. 4. Send REGISTERS_WRITE_TO_EEPROM (0x23) command to have all current registers stored into EEPROM. 5. Send the AR1000 ENABLE_TOUCH (0x12) command. The controller will use the stored calibration data after cycling power to the controller. 10.2.4 EEPROM_WRITE COMMAND TO STORE DEFAULT CALIBRATION The EEPROM_WRITE command is shown in this section. See Section 9.0 “Commands” for more command details. 10.2.5 QUALITY TEST Although not required, a level of quality assurance can be added to the process by the application issuing multiple EEPROM_READ commands to the AR1000. The response data from the EEPROM_READ commands would be tested by the application against the application’s desired data as a quality check. 10.2.6 EXAMPLE COMMAND SEQUENCE An example eight command sequence for the entire process is shown below. All values shown are in hexadecimal. Calibration values are applications specific and have been symbolically represented as follows: <> = application specific value Send to AR1000: 0x55 Header 0x<> Number of bytes to follow this one 0x29 Command ID 0x00 Desired EEPROM address to write high byte. Always 0x00 0x<> Desired EEPROM address to write low byte 0x<> Number of consecutive EEPROM addresses to write (supports 0x01 to 0x08) 0x<> Value # 1 to write 0x<> Value # 2 to write, if applicable 0x<> Value # 3 to write, if applicable 0x<> Value # 4 to write, if applicable 0x<> Value # 5 to write, if applicable 0x<> Value # 6 to write, if applicable 0x<> Value # 7 to write, if applicable 0x<> Value # 8 to write, if applicable Response from AR1000: 0x55 Header 0x02 Number of bytes to follow this one 0x00 Success response 0x29 Command ID ULxL = Upper Left corner x-coordinate Low byte : LLyH = Lower Left corner y-coordinate High byte DISABLE_TOUCH |
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