Mikroelektronika MIKROE-742 데이터 시트

305

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

function Expander_Read_PortA(ModuleAddress: byte): byte;

Byte read.

The function reads byte from Port Expander's PortA.

Parameters : 

- 

ModuleAddress

: Port Expander hardware address, see schematic at the bot

tom of this page 

Port Expander must be initialized. See Expander_Init.

Port Expander's PortA should be configured as input. See Expander_Set_Direc-
tionPortA and Expander_Set_DirectionPortAB routines.

// Read a byte from Port Expander's PORTA
var read_data : byte;
...
Expander_Set_DirectionPortA(0,0xFF);        // set expander's

porta to be input

...

read_data := Expander_Read_PortA(0);

function Expander_Read_PortB(ModuleAddress: byte): byte;

Byte read.

The function reads byte from Port Expander's PortB.

Parameters : 

- 

ModuleAddress

: Port Expander hardware address, see schematic at the bot-

tom of this page 

Port Expander must be initialized. See Expander_Init.

Port Expander's PortB should be configured as input. See Expander_Set_Direc-
tionPortB and Expander_Set_DirectionPortAB routines.

// Read a byte from Port Expander's PORTB
var read_data : byte;
...

Expander_Set_DirectionPortB(0,0xFF);        // set expander's
portb to be input
...

read_data := Expander_Read_PortB(0);