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AN2421 数据表(PDF) 4 Page - STMicroelectronics

部件名 AN2421
功能描述  Using the STMPE801 as a keypad controller
PDF  6 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

AN2421 数据表(HTML) 4 Page - STMicroelectronics

  AN2421 Datasheet HTML 1Page - STMicroelectronics AN2421 Datasheet HTML 2Page - STMicroelectronics AN2421 Datasheet HTML 3Page - STMicroelectronics AN2421 Datasheet HTML 4Page - STMicroelectronics AN2421 Datasheet HTML 5Page - STMicroelectronics AN2421 Datasheet HTML 6Page - STMicroelectronics  
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Pseudo-Code of the KPC software
AN2421
4/6
3
Pseudo-Code of the KPC software
DEFINITIONS
BB_GPIO_n
801_GPIO_n
Max_X = 8
Max_Y=8
INITIALIZATION
Set BB_GPIO as inputs
Set 801_GPIO as outputs
Set 801_GPIO to output 0xFF
VARIABLES
XCount=0
YCount=0
LOOP
YCount=0
LOOP
<I2C Transaction> Set 801_GPIO to output ( ~(YCount<<0x01) )
READ BB_GPIO (and interpret keypress)
YCount++
END LOOP IF YCount = Max_Y
WRITE_KEYS_TO_BUFFER
END LOOP



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