Subversion Repositories usb_nand_reader

#include "NandControl.h"

#include "NandDataLine.h"

#include "CMD.h"

/* NAND Control Line */

// Ready/Busy# lines

sbit ctrl_rnb3 at PORTB.B0;//LATB0_bit;

sbit ctrl_rnb2 at PORTD.B11;//LATD11_bit;

sbit ctrl_rnb1 at PORTB.B9;//LATB9_bit;

sbit ctrl_rnb0 at PORTD.B5;//LATD5_bit;

// Chip enable lines

sbit ctrl_nce3 at LATB14_bit;

sbit ctrl_nce2 at LATF0_bit;

sbit ctrl_nce1 at LATF1_bit;

sbit ctrl_nce0 at LATB8_bit;

// Other control lines

sbit ctrl_nre at LATD4_bit;

sbit ctrl_cle at LATB15_bit;

sbit ctrl_ale at LATD0_bit;

sbit ctrl_nwe at LATE0_bit;

sbit ctrl_nwp at LATE1_bit;

void init_nand_control_line()

{

     TRISB0_bit = 1;

     TRISD11_bit = 1;

     TRISB9_bit = 1;

     TRISD5_bit = 1;

     TRISB14_bit = 0;

     TRISF0_bit = 0;

     TRISF1_bit = 0;

     TRISB8_bit = 0;

     TRISD4_bit = 0;

     TRISB15_bit = 0;

     TRISD0_bit = 0;

     TRISE0_bit = 0;

     TRISE1_bit = 0;

     ctrl_nce0 = 1;

     ctrl_nce1 = 1;

     ctrl_nce2 = 1;

     ctrl_nce3 = 1;

     ctrl_nre = 1;

     ctrl_cle = 0;

     ctrl_ale = 0;

     ctrl_nwe = 1;

     ctrl_nwp = 0;

}

int nand_is_ready()

{

    int r = (int)(ctrl_rnb0 & ctrl_rnb1 & ctrl_rnb2 & ctrl_rnb3);

    if(0 == r)

        LATG6_bit = 0;

    else

        LATG6_bit = 1;

    return r;

}

void nand_wait_ready()

{

    while(0 == nand_is_ready());

}

void nand_chip_select(int idx)

{

    switch(idx)

    {

        case 0:

            ctrl_nce1 = ctrl_nce2 = ctrl_nce3 = 1;

            ctrl_nce0 = 0;

            break;

        case 1:

            ctrl_nce0 = ctrl_nce2 = ctrl_nce3 = 1;

            ctrl_nce1 = 0;

            break;

        case 2:

            ctrl_nce0 = ctrl_nce1 = ctrl_nce3 = 1;

            ctrl_nce2 = 0;

            break;

        case 3:

            ctrl_nce0 = ctrl_nce1 = ctrl_nce2 = 1;

            ctrl_nce3 = 0;

            break;

        default:

            break;

    }

}

void nand_chip_unselect()

{

    ctrl_nce0 = 1;

    ctrl_nce1 = 1;

    ctrl_nce2 = 1;

    ctrl_nce3 = 1;

}

void nand_send_command(unsigned char cmd)

{

    data_line_write_byte(cmd);

    ctrl_ale = 0;

    ctrl_nre = 1;

    ctrl_nwe = 0;

    ctrl_cle = 1;

    ctrl_nwe = 1;

    ctrl_cle = 0;

}

void nand_send_address(unsigned char* addr, int len)

{

    int i;

    ctrl_cle = 0;

    ctrl_nre = 1;

    ctrl_ale = 1;

    if(0 == addr)

    {

        data_line_write_byte(0);

        ctrl_nwe = 0;

        ctrl_nwe = 1;

    }

    else

    {

      for(i = 0; i < len; i++)

      {

          data_line_write_byte(*(addr + i));

          ctrl_nwe = 0;

          ctrl_nwe = 1;

      }

    }

    ctrl_ale = 0;

}

void nand_write(unsigned char* buffer, int len)

{

    int i;

    ctrl_cle = 0;

    ctrl_ale = 0;

    ctrl_nre = 1;

    for(i = 0; i < len; i++)

    {

        data_line_write_byte(*(buffer + i));

        ctrl_nwe = 0;

        ctrl_nwe = 1;

    }

}

void nand_read(unsigned char* buffer, int len)

{

    int i;

    ctrl_cle = 0;

    ctrl_ale = 0;

    ctrl_nwe = 1;

    for(i = 0; i < len; i++)

    {

        ctrl_nre = 0;

        while(PORTD.B4 != 0);

        *(buffer + i) = data_line_read_byte();

        ctrl_nre = 1;

        while(PORTD.B4 != 1);

    }

}

void nand_toggle_wp()

{

    ctrl_nwp = ~ctrl_nwp;

    Delay_us(2);

}

/*

void blink(int i)

{

    int j;

    for(j = 0; j < i; j++)

    {

        LATD6_bit = ~LATD6_bit;

        Delay_ms(50);

        LATD6_bit = ~LATD6_bit;

        Delay_ms(50);

    }

} */