Cincoze CV-108R-R10/P1001, User Manual

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P1001 / P1001E
Convertible Computer Modules
| User’s Manual
100
Chapter 5: Product application
5.1.1.4 Sample Code in C Language
5.1.1.4.1
Control of GP74 to GP77 (DI1 ~ DI4)
#define AddrPort 0x4E
#define DataPort 0x4F
<Enter the Extended Function Mode>
WriteByte(AddrPort, 0x87)
WriteByte(AddrPort, 0x87)
// Must write twice to enter Extended mode
<Select Logic Device>
WriteByte(AddrPort, 0x07)
WriteByte(
data Port, 0x06)
//Select logic device 06h
<Input Mode Selection> //Set GP74 to GP77 input Mode
WriteByte(AddrPort, 0x80) // Select configuration register 80h
Write Byte(DataPort, 0x0X )
//Set (bit 4~7) = 0 to select GP 74~77 as Input mode.
< input Value>
WriteByte(AddrPort, 0x82) // Select configuration register 82h
Read Byte(DataPort, Value) // Read bit 4~7(0xFx)= GP74 ~77
as High.
<Leave the Extended Function Mode>
WriteByte(AddrPort, 0xAA)