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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AR1011 датащи(PDF) 41 Page - Microchip Technology |
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AR1011 датащи(HTML) 41 Page - Microchip Technology |
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41 / 61 page  2009-2016 Microchip Technology Inc. DS40001393C-page 41 AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER 10.2 AR1011/AR1021 Storing Default Calibration Values to EEPROM If you wish to implement fixed calibration values, preloaded into the AR1000 EEPROM, then the following procedure must be followed (See Section 10.2.1 “Preparation for Fixed Calibration Values” ). 10.2.1 PREPARATION FOR FIXED CALIBRATION VALUES Determine if fixed calibration values are suitable for your application and determine your desired values. Calculate a checksum for your custom data set. See Section 9.3.4.3 “Calibration Data Encoded and Stored in EEPROM” for additional details regarding calibration data format. An example of calculating the checksum is shown below (See Table 10-1). The Checksum is an 8-bit value calculated by successive additions with overflow ignored, as shown below. Checksum = 0x45 For each of the 18 calibration values, starting at the Block Key and ending with the Flip State Checksum += Calibration value Next Calibration value TABLE 10-1: CHECKSUM CALCULATION EXAMPLE Description Value Operation Checksum Result Seed 0x45 n/a 0x45 Block Key 0x55 0x45 + 0x55 = 0x9A Upper Left X Low byte 0x06 0x9A + 0x06 = 0xA0 Upper Left X High byte 0x1B 0xA0 + 0x1B = 0xBB Upper Left Y Low byte 0xA5 0xBB + 0xA5 = 0x60 Upper Left Y High byte 0x08 0x60 + 0x08 = 0x68 Upper Right X Low byte 0x13 0x68 + 0x13 = 0x7B Upper Right X High byte 0xDF 0x7B + 0xDF = 0x5A Upper Right Y Low byte 0xF4 0x5A + 0xF4 = 0x4E Upper Right Y High byte 0x0B 0x4E + 0x0B = 0x59 Lower Right X Low byte 0x98 0x59 + 0x98 = 0xF1 Lower Right X High byte 0xE4 0xF1 + 0xE4 = 0xD5 Lower Right Y Low byte 0x1E 0xD5 + 0x1E = 0xF3 Lower Right Y High byte 0xEC 0xF3 + 0xEC = 0xDF Lower Left X Low byte 0xBF 0xDF + 0xBF = 0x9E Lower Left X High byte 0x1A 0x9E + 0x1A = 0xB8 Lower Left Y Low byte 0x32 0xB8 + 0x32 = 0xEA Lower Left Y High byte 0xE7 0xEA + 0xE7 = 0xD1 Flip State 0x01 0xD1 + 0x01 = 0xD2 Checksum 0xD2 |
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