MCP4151 digitalpotentiometer

// Library includes

//#include <avr/io.h>

#include <avr/sleep.h>

#include <compat/deprecated.h>

#include <avr/pgmspace.h>

#include <util/delay.h>

#include <inttypes.h>

#include <avr/interrupt.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "Font.h"

#define SELECT_MCP4151 PORTB &= ~(0<<PB4)

#define DESELECT_MCP4151 PORTB |= (1<<PB4)

#define DDR_SPI DDRB

#define DD_SCK  PB7

#define DD_MOSI PB5

#define DD_MISO PB6

#define DD_SS   PB4 

unsigned short read_adc(void);

void SPI_MasterInit(void);

uint8_t SPI_MasterTransmit(char cData);

// Here is the main 

int main (void)

{

unsigned char CharCol_1, CharCol_2, CharCol_3, CharCol_4, CharCol_5;

unsigned char pz, y;

unsigned int pos;

unsigned short test=0x0000;

unsigned char sign;  // setup all pins to outputs

  SPI_MasterInit();

  DDRD  = 0xff;

  DDRA  = 0xfe;

PORTD |= (0<<PD2)|(0<<PD3)|(0<<PD4)|(0<<PD5)|(0<<PD6);

int i=0;

while(i<2)

{i++;

test=read_adc();

}

if (test==0x430F)

sign=0x32;

else sign=0x31;

  if ((sign<0x20) || (sign>0x7F)) { sign = 0x20; } 

  pos = 5*(sign-0x20);

  CharCol_5 = pgm_read_byte(&code5x7[pos++]);

  CharCol_4 = pgm_read_byte(&code5x7[pos++]);

  CharCol_3 = pgm_read_byte(&code5x7[pos++]);

  CharCol_2 = pgm_read_byte(&code5x7[pos++]);

  CharCol_1 = pgm_read_byte(&code5x7[pos++]);

while (1)

{

PORTD |= (0<<PD2)|(0<<PD3)|(0<<PD4)|(0<<PD5)|(0<<PD6);

if (CharCol_1>0x00)

{

PORTD=(1<<PD2);

PORTA=(!((CharCol_1&0b01000000)>>6)<<PA1)|(!((CharCol_1&0b00100000)>>5)<<PA2)|(!((CharCol_1&0b00010000)>>4)<<PA3)|(!((CharCol_1&0b00001000)>>3)<<PA4)|(!((CharCol_1&0b00000100)>>2)<<PA5)|(!((CharCol_1&0b00000010)>>1)<<PA6)|(!((CharCol_1&0b00000001))<<PA7);

_delay_us(4000);

}

PORTD |= (0<<PD2)|(0<<PD3)|(0<<PD4)|(0<<PD5)|(0<<PD6);

if (CharCol_2>0x00)

{

PORTD=(1<<PD3);

PORTA=(!((CharCol_2&0b01000000)>>6)<<PA1)|(!((CharCol_2&0b00100000)>>5)<<PA2)|(!((CharCol_2&0b00010000)>>4)<<PA3)|(!((CharCol_2&0b00001000)>>3)<<PA4)|(!((CharCol_2&0b00000100)>>2)<<PA5)|(!((CharCol_2&0b00000010)>>1)<<PA6)|(!((CharCol_2&0b00000001))<<PA7);

_delay_us(4000);

}

PORTD |= (0<<PD2)|(0<<PD3)|(0<<PD4)|(0<<PD5)|(0<<PD6);

if (CharCol_3>0x00)

{

PORTD=(1<<PD4);

PORTA=(!((CharCol_3&0b01000000)>>6)<<PA1)|(!((CharCol_3&0b00100000)>>5)<<PA2)|(!((CharCol_3&0b00010000)>>4)<<PA3)|(!((CharCol_3&0b00001000)>>3)<<PA4)|(!((CharCol_3&0b00000100)>>2)<<PA5)|(!((CharCol_3&0b00000010)>>1)<<PA6)|(!((CharCol_3&0b00000001))<<PA7);

_delay_us(4000);

}

PORTD |= (0<<PD2)|(0<<PD3)|(0<<PD4)|(0<<PD5)|(0<<PD6);

if (CharCol_4>0x00)

{

PORTD=(1<<PD5);

PORTA=(!((CharCol_4&0b01000000)>>6)<<PA1)|(!((CharCol_4&0b00100000)>>5)<<PA2)|(!((CharCol_4&0b00010000)>>4)<<PA3)|(!((CharCol_4&0b00001000)>>3)<<PA4)|(!((CharCol_4&0b00000100)>>2)<<PA5)|(!((CharCol_4&0b00000010)>>1)<<PA6)|(!((CharCol_4&0b00000001))<<PA7);

_delay_us(4000);

}

PORTD |= (0<<PD2)|(0<<PD3)|(0<<PD4)|(0<<PD5)|(0<<PD6);

if (CharCol_5>0x00)

{

PORTD=(1<<PD6);

PORTA=(!((CharCol_5&0b01000000)>>6)<<PA1)|(!((CharCol_5&0b00100000)>>5)<<PA2)|(!((CharCol_5&0b00010000)>>4)<<PA3)|(!((CharCol_5&0b00001000)>>3)<<PA4)|(!((CharCol_5&0b00000100)>>2)<<PA5)|(!((CharCol_5&0b00000010)>>1)<<PA6)|(!((CharCol_5&0b00000001))<<PA7);

_delay_us(4000);

}

}

}

void SPI_MasterInit(void)

{volatile char IOReg;

/* Set MOSI and SCK output, all others input */

DDR_SPI =(1<<DD_MOSI)|(1<<DD_SCK)|(1<<DD_SS);

/* Enable SPI, Master, set clock rate fck/16 */

SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR1);

SPSR=(1<<SPI2X);

IOReg=SPSR;                   // clear SPIF bit in SPSR

IOReg=SPDR;

}

uint8_t SPI_MasterTransmit(char cData)

{

/* Start transmission */

SPDR = cData;

/* Wait for transmission complete */

while(!(SPSR & (1<<SPIF)));

return SPDR;

}

unsigned short read_adc(void)

{

  // select ADC wait 100 microseconds then read two bytes

 SELECT_MCP4151;

_delay_us(100);

unsigned char one =SPI_MasterTransmit(0x43);

_delay_us(100); 

unsigned char two = SPI_MasterTransmit(0x0F);

DESELECT_MCP4151;

//move into 16 bit int

 return ((one<<8)|two) ;

}