Mikroelektronika MIKROE-742 데이터 시트

306

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

function Expander_Read_PortAB(ModuleAddress: byte): word;

Word read.

The function reads word from Port Expander's ports. PortA readings are in the
higher byte of the result. PortB readings are in the lower byte of the result.

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 and PortB should be configured as inputs. See
Expander_Set_DirectionPortA, Expander_Set_DirectionPortB and
Expander_Set_DirectionPortAB routines.

// Read a byte from Port Expander's PORTA and PORTB
var read_data : word;
...
Expander_Set_DirectionPortAB(0,0xFFFF);        // set expander's

porta and portb to be input

...

read_data := Expander_Read_PortAB(0);

procedure Expander_Write_PortA(ModuleAddress: byte; Data_: byte);

Nothing.

The function writes byte to Port Expander's PortA.

Parameters : 

- 

ModuleAddress

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

tom of this page 

- 

Data_

: data to be written 

Port Expander must be initialized. See Expander_Init.

Port Expander's PortA should be configured as output. See
Expander_Set_DirectionPortA and Expander_Set_DirectionPortAB routines.

// Write a byte to Port Expander's PORTA

...
Expander_Set_DirectionPortA(0,0x00);        // set expander's

porta to be output
...

Expander_Write_PortA(0, 0xAA);