Dfi HD620-H81 User Manual download pdf (Page 76)

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76

Chapter 5 Digital I/O Programming Guide

Chapter 5

Function Description

I2CWriteByte(SlaveAddr, SubAddr, Data):

Write a Byte data to a specified I2C Device.

I2CReadByte(SlaveAddr, SubAddr, *Data):

Read a Byte data from a specified I2C Device.

SetBit(*Data, Bit) :

Set Data bit n as “1”.

ClrBit(*Data, Bit) :

Set Data bit n as “0”.

GetBit(Data, Bit) :

Return the value of data bit n.

Sample Code

GPIO Configuration

#deﬁ ne SLAVE_ADDR 0x42

#deﬁ ne INPUT_PORT 0x00

#deﬁ ne OUTPUT_PORT 0x01

#deﬁ ne INVERSION_PORT 0x02

#deﬁ ne COMFIG_PORT 0x03

GpioConﬁ g(int PinNum, int Mode)

{

BYTE Data;

BYTE TempPinNum = PinNum%8;

//Pin0-7 Input/Output Conﬁ guration

I2C_ReadByte(SLAVE_ADDR, CONFIG_PORT, &Data);

if(Mode == 1){SetBit(&Data, TempPinNum);} //Input

else {ClrBit(&Data, TempPinNum);} //Output

I2C_WriteByte(SLAVE_ADDR, CONFIG_PORT, Data);

return 1;

GPIO Output Process

#deﬁ ne SLAVE_ADDR 0x42

#deﬁ ne INPUT_PORT 0x00

#deﬁ ne OUTPUT_PORT 0x01

#deﬁ ne INVERSION_PORT 0x02

#deﬁ ne COMFIG_PORT 0x03

GpioOut(int PinNum, int Level)

{

BYTE Data;

BYTE TempPinNum = PinNum%8;

//Pin0-7

I2C_ReadByte(SLAVE_ADDR, OUTPUT_PORT, &Data);

if(Level == 0){ClrBit(&Data, TempPinNum);}

else {SetBit(&Data, TempPinNum);}

I2C_WriteByte(SLAVE_ADDR, OUTPUT_PORT, Data);

return 1;

GPIO Iutput Process

#deﬁ ne SLAVE_ADDR 0x42

#deﬁ ne INPUT_PORT 0x00

#deﬁ ne OUTPUT_PORT 0x01

#deﬁ ne INVERSION_PORT 0x02

#deﬁ ne COMFIG_PORT 0x03

GpioIn(int PinNum, int *Status)

{

BYTE Data;

BYTE Group = PinNum/8;

BYTE TempPinNum = PinNum%8;

//Pin0-7

I2C_ReadByte(SLAVE_ADDR, INPUT_PORT, &Data);

*Status = GetBit(Data, TempPinNum);

return 1;

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