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[SOLVED] Port Expander SPI MCP23S17 Help

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jayanth.devarayanadurga

jayanth.devarayanadurga

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What is wrong with my Code. Why it is not working?

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//Project: Port Expander
//MCU:     PIC16F877A
//Clock:   8 MHz
//Author:  Jayanth Devarayanadurga
 
#define I2CMODE 1
#define SPIMODE 0
#define WrtCmd  0
#define RdCmd   1
 
//#defines are with IOCON.BANK = 0
 
#define IODIRA      0x00
#define IODIRB      0x01
#define IPOLA       0x02
#define IPOLB       0x03
#define GPINTENA    0x04
#define GPINTENB    0x05
#define DEFVALA     0x06
#define DEFVALB     0x07
#define INTCONA     0x08
#define INTCONB     0x09
#define IOCONA      0x0A
#define IOCONB      0x0B
#define GPPUA       0x0C
#define GPPUB       0x0D
#define INTFA       0x0E
#define INTFB       0x0F
#define INTCAPA     0x010
#define INTCAPB     0x011
#define GPIOA       0x012
#define GPIOB       0x013
#define OLATA       0x014
#define OLATB       0x015
 
#define IORESET PORTC.F5
#define CS PORTC.F6
 
#define HRDWADD 0 // device hard address  //6
unsigned char gAddrPins = HRDWADD <<1;
unsigned char SerialMode = SPIMODE; //I2CMODE;
unsigned char gControlByte = 0x40;
unsigned char mode = 0; //1 for SPI, 0 for I2C
 
void I2CWriteByte(unsigned char reg, unsigned char data_);
void Write23X17(unsigned char reg, unsigned char data_);
void ResetMCP23X17();
void MCP_Init(void);
 
void ResetMCP23X17(){
 IORESET = 0;
 delay_us(100);
 //IORESET = 1;;
}
 
void SPIWriteByte(unsigned char reg, unsigned char data_)
{
   PORTC.F6 = 0;
   SPI1_Write(WrtCmd | gAddrPins);
   SPI1_Write(reg);
   SPI1_Write(data_);
   PORTC.F6 = 1;
 
}
 
//****************************************
//   I2CWriteByte(unsigned char addr, unsigned char byte)
//   Writes a byte to the 23017
//****************************************
/*************************************************************
   Function Name:  Write23X17
   Return Value:   void
   Parameters:     Register address, Data
   Description:    Writes a 23X17 register. I2C or SPI is in
                   global byte
**************************************************************/
void Write23X17(unsigned char reg, unsigned char data_)
{
                                   //Else 23S17 is selected
     SPIWriteByte(reg, data_);  //
 
}
 
void MCP23X17_Init()
{
 
 
  //Configure 23017
  //Write23X17(GPPUA,  0x00);   // Pullups
  Write23X17(IOCONA, 0x40);     //
  Write23X17(IOCONB, 0x40);
  Write23X17(IODIRA, 0x00);     //All outs
  Write23X17(IODIRB, 0x00);     //All outs
 
}
 
void I2CWriteByte(unsigned char reg, unsigned char data_)
{
   I2C1_Start();
   I2C1_Wr(gControlByte | WrtCmd | gAddrPins);
   I2C1_Wr(reg);
   I2C1_Wr(data_);
   I2C1_Stop();
}
 
void main(){
 
      TRISA = TRISB = TRISD = PORTA = PORTB = PORTD = 0x00;
      TRISC = 0x00;
      PORTC = 0x00;
 
      SPI1_Init_Advanced(_SPI_MASTER_OSC_DIV4, _SPI_DATA_SAMPLE_MIDDLE, _SPI_CLK_IDLE_LOW, _SPI_LOW_2_HIGH);
      //SPI1_Init();
 
      MCP23X17_Init();
 
      while(1){
 
 
          Write23X17(GPIOA, 0xAA);
          Delay_ms(1000);
          Write23X17(GPIOA, 0x55);
          Delay_ms(1000);
 
      }
}
 

Attachments

  • Port Expander I2C v2.rar
    53.7 KB · Views: 51

I Converted this microchip sample code to mikroC Code but it is not working. What is the problem?

**broken link removed**

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//Project: Port Expander
//MCU:     PIC16F877A
//Clock:   8 MHz
//Author:  Jayanth Devarayanadurga
 
#define I2CMODE 1
#define SPIMODE 0
#define WrtCmd  0
#define RdCmd   1
 
//#defines are with IOCON.BANK = 0
 
#define IODIRA      0x00
#define IODIRB      0x01
#define IPOLA       0x02
#define IPOLB       0x03
#define GPINTENA    0x04
#define GPINTENB    0x05
#define DEFVALA     0x06
#define DEFVALB     0x07
#define INTCONA     0x08
#define INTCONB     0x09
#define IOCONA      0x0A
#define IOCONB      0x0B
#define GPPUA       0x0C
#define GPPUB       0x0D
#define INTFA       0x0E
#define INTFB       0x0F
#define INTCAPA     0x010
#define INTCAPB     0x011
#define GPIOA       0x012
#define GPIOB       0x013
#define OLATA       0x014
#define OLATB       0x015
 
#define IORESET PORTC.F7
#define CS PORTC.F6
 
#define HRDWADD 0 // device hard address  //6
 
void main(){
 
      TRISA = TRISB = TRISD = PORTA = PORTB = PORTD = 0x00;
      TRISC = 0x00;
      PORTC = 0x00;
 
      CS = 1;
      IORESET = 0;
      Delay_us(100);
      IORESET = 1;
      
      SPI1_Init_Advanced(_SPI_MASTER_OSC_DIV16, _SPI_DATA_SAMPLE_MIDDLE, _SPI_CLK_IDLE_LOW, _SPI_HIGH_2_LOW);
 
      CS = 0;
      SPI1_Write(0x40);
      SPI1_Write(IOCONA);
      SPI1_Write(0x28);
      CS = 1;
 
      CS = 0;
      SPI1_Write(0x42);
      SPI1_Write(IODIRA);
      SPI1_Write(0x00);
      CS = 1;
            
      while(1){
 
            CS = 0;
            SPI1_Write(0x42);
            SPI1_Write(GPIOA);
            SPI1_Write(0xA6);
            CS = 1;
 
            Delay_ms(500);
 
      }
}


Edit: I got it working. Here is the working code.

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//Project: Port Expander
//MCU:     PIC16F877A
//Clock:   8 MHz
//Author:  Jayanth Devarayanadurga
 
#define I2CMODE 1
#define SPIMODE 0
#define WrtCmd  0
#define RdCmd   1
 
//#defines are with IOCON.BANK = 0
 
#define IODIRA      0x00
#define IODIRB      0x01
#define IPOLA       0x02
#define IPOLB       0x03
#define GPINTENA    0x04
#define GPINTENB    0x05
#define DEFVALA     0x06
#define DEFVALB     0x07
#define INTCONA     0x08
#define INTCONB     0x09
#define IOCONA      0x0A
#define IOCONB      0x0B
#define GPPUA       0x0C
#define GPPUB       0x0D
#define INTFA       0x0E
#define INTFB       0x0F
#define INTCAPA     0x010
#define INTCAPB     0x011
#define GPIOA       0x012
#define GPIOB       0x013
#define OLATA       0x014
#define OLATB       0x015
 
#define IORESET PORTC.F7
#define CS PORTC.F6
 
#define HRDWADD 0 // device hard address  //6
 
void main(){
 
      TRISA = TRISB = TRISD = PORTA = PORTB = PORTD = 0x00;
      TRISC = 0x00;
      PORTC = 0x00;
 
      CS = 1;
      IORESET = 0;
      Delay_us(100);
      IORESET = 1;
      
      SPI1_Init_Advanced(_SPI_MASTER_OSC_DIV16, _SPI_DATA_SAMPLE_MIDDLE, _SPI_CLK_IDLE_LOW, _SPI_HIGH_2_LOW);
 
      CS = 0;
      SPI1_Write(0x40);
      SPI1_Write(IOCONA);
      SPI1_Write(0x28);
      CS = 1;
 
      CS = 0;
      SPI1_Write(0x40);
      SPI1_Write(IODIRA);
      SPI1_Write(0x00);
      CS = 1;
            
      while(1){
 
            CS = 0;
            SPI1_Write(0x40);
            SPI1_Write(GPIOA);
            SPI1_Write(0xAA);
            CS = 1;
 
            Delay_ms(500);
            
            CS = 0;
            SPI1_Write(0x40);
            SPI1_Write(GPIOA);
            SPI1_Write(0x55);
            CS = 1;
 
            Delay_ms(500);
 
      }
}


 
Last edited:

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