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atmel

mridula v

how 2 intialize at89c51ed2 for spi communication with ds1306?

Parents
  • 0 in reply to erik malund

    I have written the comments plz go through it
    #include <REG51xD2.H>

    void SPI(unsigned char);

    void sdelay(int );
    void main(void)
    {

    EA=1;
    SPSTA=0x00;
    SPCON=0xd6; /*MSTR(4th bit),SPEN(7th bit),CPHA (2nd bit),7th,0th & 1st bits are enbled. the 7th ,0th & 1st bits are enbled for Fclk Periph/128*/

    IEN1=0x04; /* enable spi interrupt */

    P1_7=1;/*mOsi enable*/
    P1_6=1;/*sck enable*/
    P1_1=1;/*slave select*/
    sdelay(1);
    SPI(0x80);/* send an example data */
    sdelay(1);
    while(1);
    }

    void SPI(unsigned char mybyte)
    {

    SPDAT=mybyte;/* read receive data */

    while(!(SPSTA&0x80))/* set software flag */ { ; }

    SPSTA&=0x7f;

    }

    void sdelay(int ms)
    { unsigned int i,j;
    for(i=0;i<ms;i++)
    for(j=0;j<135;j++);

    }

Reply
  • 0 in reply to erik malund

    I have written the comments plz go through it
    #include <REG51xD2.H>

    void SPI(unsigned char);

    void sdelay(int );
    void main(void)
    {

    EA=1;
    SPSTA=0x00;
    SPCON=0xd6; /*MSTR(4th bit),SPEN(7th bit),CPHA (2nd bit),7th,0th & 1st bits are enbled. the 7th ,0th & 1st bits are enbled for Fclk Periph/128*/

    IEN1=0x04; /* enable spi interrupt */

    P1_7=1;/*mOsi enable*/
    P1_6=1;/*sck enable*/
    P1_1=1;/*slave select*/
    sdelay(1);
    SPI(0x80);/* send an example data */
    sdelay(1);
    while(1);
    }

    void SPI(unsigned char mybyte)
    {

    SPDAT=mybyte;/* read receive data */

    while(!(SPSTA&0x80))/* set software flag */ { ; }

    SPSTA&=0x7f;

    }

    void sdelay(int ms)
    { unsigned int i,j;
    for(i=0;i<ms;i++)
    for(j=0;j<135;j++);

    }

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