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MCP23S17 16 Bit SPI IO Expander Driver

 
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sshahryiar



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Posts: 92
Location: Dhaka, Bangladesh

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MCP23S17 16 Bit SPI IO Expander Driver
PostPosted: Wed Oct 02, 2013 10:13 am     Reply with quote

MCP23S17.h
Code:

#use SPI (MASTER, DO = PIN_B1, DI = PIN_B3, CLK = PIN_B0, BITS = 8, Mode = 0)


#define IO_DEVICE_ADDRESS_WRITE   0x40
#define IO_DEVICE_ADDRESS_READ    0x41

#define IODIRA        0x00      //Data Direction Register for PORTA   
#define IODIRB        0x01      //Data Direction Register for PORTB
#define IPOLA         0x02      //Input Polarity Register for PORTA
#define IPOLB         0x03      //Input Polarity Register for PORTB
#define GPINTENA      0x04      //Interrupt-on-change enable Register for PORTA
#define GPINTENB      0x05      //Interrupt-on-change enable Register for PORTB
#define DEFVALA       0x06      //Default Value Register for PORTA   
#define DEFVALB       0x07      //Default Value Register for PORTB     
#define INTCONA       0x08      //Interrupt-on-change control Register for PORTA 
#define INTCONB       0x09      //Interrupt-on-change control Register for PORTB     
#define IOCON         0x0A      //Configuration register for device                     
#define GPPUA         0x0C      //100kOhm pullup resistor register for PORTA (sets pin to input when set)   
#define GPPUB         0x0D      //100kOhm pullup resistor register for PORTB (sets pin to input when set)     
#define INTFA         0x0E      //Interrupt flag Register for PORTA       
#define INTFB         0x0F      //Interrupt flag Register for PORTB   
#define INTCAPA       0x10      //Interrupt captured value Register for PORTA 
#define INTCAPB       0x11      //Interrupt captured value Register for PORTB   
#define GPIOA         0x12      //General purpose I/O Register for PORTA 
#define GPIOB         0x13      //General purpose I/O Register for PORTB
#define OLATA         0x14      //Output latch Register for PORTA
#define OLATB         0x15      //Output latch Register for PORTB 

#define CS           pin_B2

                                                                         
void setup_MCP23S17();                           
void MCP23S17_write(unsigned char address, unsigned char value);         
unsigned char MCP23S17_read(unsigned char address); 


MCP23S17.c

Code:

#include "MCP23S17.h" 


void setup_MCP23S17()
{                                                 
   MCP23S17_write(IOCON, 0x18);
   MCP23S17_write(IODIRA, 0x00); 
   MCP23S17_write(IODIRB, 0xFF); 
   MCP23S17_write(GPPUA, 0x00); 
   MCP23S17_write(GPPUB, 0xFF);
   MCP23S17_write(IPOLA, 0xFF);   
   MCP23S17_write(IPOLB, 0x00);
}                                                                   
                                                       
                                                 
void MCP23S17_write(unsigned char address, unsigned char value)
{                                                 
    output_low(CS);
    spi_xfer(IO_DEVICE_ADDRESS_WRITE);
    spi_xfer(address);                           
    spi_xfer(value);
    output_high(CS);                 
}                                                 
                                                 
                                                 
unsigned char MCP23S17_read(unsigned char address)                 
{                                                 
    unsigned char received_data = 0;
    output_low(CS);
    spi_xfer(IO_DEVICE_ADDRESS_READ);           
    spi_xfer(address);                           
    received_data = spi_xfer(0); 
    output_high(CS);         
    return received_data;                                 
}


Example
Code:

#include <10F200.h>                                     
#fuses PROTECT, NOWDT, NOMCLR         
#use delay (clock = 4MHz)                                                 
                                                   
#include "MCP23S17.c"
                                                 
void setup();                                                 
                                                                             
                                                 
void main()                                       
{                                                 
    unsigned char in = 0;
    setup();
           
    while(TRUE)                                   
    {                 
      in = MCP23S17_read(GPIOB);
      MCP23S17_write(OLATA, in);
    }                                                                   
}                                                 
                                                 
                                                 
void setup()                                     
{                                                                           
    setup_MCP23S17();                             
}                                                 
       

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SShahryiar
sshahryiar



Joined: 05 May 2010
Posts: 92
Location: Dhaka, Bangladesh

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Demo
PostPosted: Wed Oct 02, 2013 11:19 am     Reply with quote

https://www.facebook.com/photo.php?fbid=414425551990900&set=pb.113572212076237.-2207520000.1380734269.&type=3&theater
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