User manual

mikroC PRO for dsPIC
MikroElektronika
441
Port Expander Library
The mikroC PRO for dsPIC30/33 and PIC24 provides a library for communication with the Microchip’s Port Expander
MCP23S17 via SPI interface. Connections of the dsPIC30/33 and PIC24 MCU and MCP23S17 is given on the schematic
at the bottom of this page.
Important :
- The library uses the SPI module for communication. User must initialize the appropriate SPI module before using
the Port Expander Library.
- For MCUs with multiple SPI modules it is possible to initialize all of them and then switch by using the SPI_Set_
Active() function. See the SPI Library functions.
- Library does not use Port Expander interrupts.
Library Dependency Tree
The following variables must be
dened in all projects using Port
Expander Library:
Description : Example :
extern sfr sbit
SPExpanderRST;
Reset line.
sbit SPExpanderRST at RF0_bit;
extern sfr sbit
SPExpanderCS;
Chip Select line.
sbit SPExpanderCS at RF1_bit;
extern sfr sbit
SPExpanderRST_Direction;
Direction of the Reset pin.
sbit SPExpanderRST_Direction at
TRISF0_bit;
extern sfr sbit
SPExpanderCS_Direction;
Direction of the Chip Select
pin.
sbit SPExpanderCS_Direction at
TRISF1_bit;
External dependencies of Port Expander Library
Library Routines
- Expander_Init
- Expander_Init_Advanced
- Expander_Read_Byte
- Expander_Write_Byte
- Expander_Read_PortA
- Expander_Read_PortB
- Expander_Read_PortAB
- Expander_Write_PortA
- Expander_Write_PortB
- Expander_Write_PortAB
- Expander_Set_DirectionPortA
- Expander_Set_DirectionPortB
- Expander_Set_DirectionPortAB
- Expander_Set_PullUpsPortA
- Expander_Set_PullUpsPortB
- Expander_Set_PullUpsPortAB