twi_test.c

#include <inttypes.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include "xlcd.h"
#include "xmega_a4u.h"

/*! Defining an example slave address. */
#define SLAVE_ADDRESS   0x25

/*! Defining number of bytes in buffer. */
#define NUM_BYTES   8

/*! CPU speed 2MHz, BAUDRATE 100kHz and Baudrate Register Settings */
#define CPU_SPEED       F_CPU
#define BAUDRATE    F_TWI
#define F_TWI       100000
#define TWI_BAUDSETTING TWI_BAUD(CPU_SPEED, BAUDRATE)
#define TWI_BAUD(F_CPU, F_TWI) ((F_CPU / (2 * F_TWI)) - 5)

static volatile uint8_t buff[8],touchx_bf[13],touchy_bf[13],touchlsb_bf[8];



void twi_write(uint8_t addr, uint8_t byte){
       /*SEND SLAVE ADDRESS + W BIT */
    TWIC_MASTER_ADDR = 0X4a;
      /*WAIT FOR THE WRITE INTERUPT FLAG TO SET HIGH*/
    while(!(TWIC_MASTER_STATUS & TWI_MASTER_WIF_bm));

       /*SEND HIGH BYTE OF EEPROM MEMORY ADDRESS*/
    TWIC_MASTER_DATA = addr;
    while(!(TWIC_MASTER_STATUS & TWI_MASTER_WIF_bm));

       /*SEND LOW BYTE OF EEPROM MEMORY ADDRESS*/
    TWIC_MASTER_DATA = byte;
    while(!(TWIC_MASTER_STATUS & TWI_MASTER_WIF_bm));

       /* MASTER SENDS ACK AND ISSUES A STOP */
//     TWIC_MASTER_CTRLC = 0X03;

//     TWIC_MASTER_ADDR = 0X4a;
//       /*WAIT FOR THE WRITE INTERUPT FLAG TO SET HIGH*/
//     while(!(TWIC_MASTER_STATUS & TWI_MASTER_WIF_bm));
//
//        /*SEND HIGH BYTE OF EEPROM MEMORY ADDRESS*/
//     TWIC_MASTER_DATA = 0x04;
//     while(!(TWIC_MASTER_STATUS & TWI_MASTER_WIF_bm));
//
//        /*SEND LOW BYTE OF EEPROM MEMORY ADDRESS*/
//     TWIC_MASTER_DATA = 0x20;
//     while(!(TWIC_MASTER_STATUS & TWI_MASTER_WIF_bm));
//
       /* MASTER SENDS ACK AND ISSUES A STOP */
    TWIC_MASTER_CTRLC = 0X03;

}
uint8_t twi_read(uint8_t addr){

    TWIC_MASTER_ADDR = 0X4a;
      /*WAIT FOR THE WRITE INTERUPT FLAG TO SET HIGH*/
    while(!(TWIC_MASTER_STATUS & TWI_MASTER_WIF_bm));

       /*SEND HIGH BYTE OF EEPROM MEMORY ADDRESS*/
    TWIC_MASTER_DATA = addr;
    while(!(TWIC_MASTER_STATUS & TWI_MASTER_WIF_bm));


    TWIC_MASTER_ADDR = 0X4b;
    while(!(TWIC_MASTER_STATUS & TWI_MASTER_RIF_bm));

//     buff[offset] = TWIC_MASTER_DATA;
    TWIC_MASTER_CTRLC = TWI_MASTER_ACKACT_bm | TWI_MASTER_CMD_STOP_gc;

    return TWIC_MASTER_DATA;
}

// void debug(uint8_t x, uint8_t y){
//   lcd_gotoxy(x,y);
//   itoa(TWIC_MASTER_STATUS,temp,2);
//   lcd_puts(temp);
//
// }

int main(void)
{
  setup_clk_32M_int();
  lcd_init(LCD_DISP_ON);
  lcd_clrscr();

  uint16_t touchx,touchy;
  uint8_t str1[8], str2[8];
    TWIC_MASTER_BAUD = 0x9B;
       /*SET WIEN, ENABLE and INTLVL bits high.*/
    TWIC_MASTER_CTRLA |= 0xD8;
       /*Force TWI bus idle mode.*/
    TWIC_MASTER_STATUS |= 0x01;

  PORTA.DIRSET  = PIN1_bm;      //reset_io
  PORTA.DIRSET  = PIN4_bm | PIN5_bm | PIN6_bm | PIN7_bm;
  PORTA.DIRCLR  = PIN2_bm | PIN3_bm;    //PIN2 INT; PIN3 SYNC;

//   PORTA.PIN0CTRL = PORT_ISC_RISING_gc;
//   PORTA.INT0MASK = PIN2_bm;
//   PORTA.INTCTRL   = PORT_INT0LVL_LO_gc;
//
  //short reset
//   PORTA.OUTCLR   = PIN1_bm;
//   _delay_ms(5);
  PORTA.OUTSET  = PIN1_bm | PIN4_bm | PIN5_bm | PIN6_bm | PIN7_bm;
//   PORTA.OUTCLR  |= PIN4_bm | PIN5_bm | PIN6_bm | PIN7_bm;
//     PMIC.CTRL |= PMIC_HILVLEN_bm | PMIC_LOLVLEN_bm;
//   sei();

  twi_write(0x05,0x01);
  twi_write(0x20,0x08);
  twi_write(0x21,0x05);

  twi_write(0x22,0x06);
  twi_write(0x23,0xF2);
  twi_write(0x24,0xF6);

  twi_write(0x25,0x84);
  twi_write(0x26,0x02);
  twi_write(0x2A,0x04);
  twi_write(0x2B,0x07);
  twi_write(0x2C,0x07);

  twi_write(0x2D,0x0A);

  twi_write(0x31,0x03);
  twi_write(0x32,0x01);

  twi_write(0x33,0x03);
  twi_write(0x34,0x01);

  twi_write(0x50,0xCB);
  twi_write(0x51,0xCB);
  twi_write(0x58,0xCB);
  twi_write(0x59,0xCB);

  twi_write(0x05,0x02);

//   twi_write(0x04,0x02);
//   twi_write(0x04,0x01);

  for (;;) {
      buff[0]=twi_read(0x11);
      buff[1]=twi_read(0x12);
      buff[2]=twi_read(0x13);
      buff[3]=twi_read(0x90);
      buff[4]=twi_read(0x91);

      touchx=((buff[0] << 4) | ((0xF0 & buff[2]) >> 4));
      touchy=((buff[1] << 4) | ((0x0F & buff[2])));

      itoa(touchx,touchx_bf,10);
      itoa(touchy,touchy_bf,10);
      itoa(buff[3],str1,16);
      itoa(buff[4],str2,16);

//       if(((touchx <= 340) && (touchx >= 300)) && (touchy >= 310)){
//  PORTA.OUTCLR = PIN4_bm;
//       }
//       if(((touchx <= 410) && (touchx >= 350)) && ((touchy >= 150) && (touchy <= 191))){
//  PORTA.OUTSET = PIN4_bm;
//       }
//       if(!(PORTA.IN & PIN2_bm)){ PORTA.OUTTGL = PIN4_bm;}
//       if(!(PORTA.IN & PIN3_bm)){ PORTA.OUTTGL = PIN5_bm;}
      lcd_gotoxy(0,0);
      lcd_puts(touchx_bf);
      lcd_gotoxy(0,1);
      lcd_puts(touchy_bf);
      lcd_gotoxy(0,2);
      lcd_puts(str1);
      lcd_gotoxy(10,2);
      lcd_puts(str2);


      _delay_ms(128);
  }
}