User manual

mikroBasic PRO for dsPIC30/33 and PIC24
MikroElektronika
419
Expander_Init_Advanced
Prototype
sub procedure Expander_Init_Advanced(dim byref rstPort, rstPin, haen as
byte)p>
Description Initializes Port Expander using SPI communication.
Parameters - rstPort: Port Expander’s reset port
- rstPin: Port Expander’s reset pin
- haen: Port Expander’s hardware address
Returns Nothing.
Requires - SPExpanderCS: Chip Select line
- SPExpanderRST: Reset line
- SPExpanderCS_Direction: Direction of the Chip Select pin
- SPExpanderRST_Direction: Direction of the Reset pin
must be dened before using this function.
SPI module needs to be initialized. See SPIx_Init and SPIx_Init_Advanced routines.
Example
‘ Port Expander module connections
dim SPExpanderRST as sbit at LATF0_bit
SPExpanderCS as sbit at LATF1_bit
SPExpanderRST_Direction as sbit at TRISF0_bit
SPExpanderCS_Direction as sbit at TRISF1_bit
‘ End Port Expander module connections
...
‘ If Port Expander Library uses SPI1 module
SPI1_Init() ‘ initialize SPI module
Expander_Init_Advanced(PORTB, 0, 0) ‘ initialize Port Expander
Notes None.
Expander_Read_Byte
Prototype
sub function Expander_Read_Byte(dim ModuleAddress, RegAddress as byte) as
byte
Description The function reads byte from Port Expander.
Parameters - ModuleAddress: Port Expander hardware address, see schematic at the bottom of this page
- RegAddress: Port Expander’s internal register address
Returns Byte read.
Requires Port Expander must be initialized. See Expander_Init.
Example
‘ Read a byte from Port Expander’s register
dim read_data as byte
...
read_data = Expander_Read_Byte(0,1)
Notes None.