bit z;
void Serial_Write_8(unsigned char Data) {
unsigned char x;
PORTD.2=1;
delay_ms(5);
PORTD.1=1; /* send start bit */
delay_ms(5);
for (x=0;x<8;x++) {
if (Data&0x80)
PORTD.2=1; // DI_SET;
else
PORTD.2=0; //DI_CLEAR;
delay_ms(7);
PORTD.1=1; //SK_SET;
delay_ms(10);
PORTD.1=0; //SK_CLEAR;
delay_ms(10);
Data*=2;
}
}
void EWEN(void) {
PORTD.0=1;
delay_ms(5);
Serial_Write_8(0x30); /* EWEN instruction */
PORTD.0=0;
delay_us(1);
//putchar1('2');
}
void WRITE(unsigned int num,unsigned char addr) {
unsigned char x;
PORTD.0=1;
delay_ms(20);
Serial_Write_8(0x40 | addr); /* send command for write operation & address */
delay_ms(5);
PORTD.1=1; //SK_SET;
delay_ms(10);
for (x=0;x<16;x++) {
z = num>>15;
if (z)
PORTD.2=1; // DI_SET;
else
PORTD.2=0; //DI_CLEAR;
delay_ms(7);
PORTD.1=0; //SK_CLEAR;
delay_ms(10);
num*=2;
}
PORTD.0=0;
delay_us(2);
}
//--------------------------------------------------------------
unsigned int READ(unsigned char addr) {
unsigned char x,b;
unsigned int Data=0;
PORTD.0=1;
delay_ms(5);
Serial_Write_8(0x80 | addr); /* send write address */
delay_ms(5);
PORTD.1=0;
delay_us(2);
PORTD.1=1;
delay_ms(7);
b=PIND.3; //to get the dummy bit before reading actual data
PORTD.1=0;
delay_ms(7);
for (x=0;x<16;x++) {
Data*=2;
PORTD.1=0; // data is obtained on the rising edge of the sck clock so first make
delay_us(2); // PORTD.1 pin low for some time & again make it high.
PORTD.1=1;
delay_ms(7);
Data|=PIND.3;
PORTD.1=0;
delay_ms(7);
}
PORTD.0=0; //CE_CLEAR;
delay_us(2);
return(Data);
}
//--------------------------------------------------------------
void main(void) {
unsigned char A1=0x05; //93c46 memory address
unsigned int DATA=0x48; // writting 'H' into memory location
unsigned int DATA1;
PORTB=0xFF;
DDRB=0xFF;
PORTD=0x00;
EWEN();
WRITE(DATA, A1);
delay_ms(1000);
DATA1 = READ(A1);
PORTB.3 = 0;
if(DATA1 == DATA)
PORTB.4 = 0;
}
oo:
#define CS PORTC.0 #define SK PORTC.1 #define DI PORTC.2 #define DO PINC.3
void Serial_Write_8(unsigned char Data)
{
unsigned char x;
DI=1;
delay_ms(5); //5
SK=1; /* send start bit */
delay_ms(5); //5
DI=0;
delay_ms(5);
SK=0;
for (x=0;x<8;x++) {
if (Data&0x80)
DI=1; // DI_SET;
else
DI=0; //DI_CLEAR;
delay_ms(7);
SK=1; //SK_SET;
delay_ms(10);
SK=0; //SK_CLEAR;
delay_ms(10);
Data*=2;
}
DI=0;
}
void EWEN(void)
{
CS=1;
delay_ms(5);
Serial_Write_8(0x30); /* EWEN instruction 3*/
CS=0;
delay_us(1);
}
void WRITE(unsigned int num,unsigned char addr)
{
unsigned char x;
CS=1;
delay_ms(20);//20
Serial_Write_8(0x40 | addr); //send command for write operation & address
delay_ms(55); //5
for (x=0;x<16;x++) {
z = num>>15;
if (z)
DI=1; // DI_SET;
else
DI=0; //DI_CLEAR;
delay_ms(7);
SK=1; //SK_CLEAR;
delay_ms(10);
SK=0;
num*=2;
}
CS=0;
delay_ms(1);
}
unsigned int READ(unsigned char addr)
{
unsigned char x,b;
unsigned int Data=0;
CS=1;
delay_ms(5); //5
Serial_Write_8(0x80 | addr); /* send write address */
delay_ms(5);
b=DO; //to get the dummy bit before reading actual data
SK=0;
delay_ms(7); //7
for (x=0;x<16;x++) {
Data*=2;
SK=0; // data is obtained on the rising edge of the sck clock so first make
delay_us(2); // PORTD.1 pin low for some time & again make it high.
SK=1;
delay_ms(7);
Data|=DO;
SK=0;
delay_ms(7);
}
CS=0; //CE_CLEAR;
delay_us(2);
return(Data);
}
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