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);
    }
} */