Katana SDKs - Версия для печати

Код:
#define SCIREG(x) *((volatile uint8 *)(x))

#define SCSMR1  SCIREG(0xFFE00000)

#define SCBRR1  SCIREG(0xFFE00004)

#define SCSCR1  SCIREG(0xFFE00008)

#define SCTDR1  SCIREG(0xFFE0000C)

#define SCSSR1  SCIREG(0xFFE00010)

#define SCRDR1  SCIREG(0xFFE00014)

#define SCSPTR1 SCIREG(0xFFE00018)



#define TDRE    0x80

#define RDRF    0x40

#define ORER    0x20



#define STBCR    SCIREG(0xFFC00004)



#define PCTRA    *((volatile uint32 *)(0xFF80002C))

#define PDTRA    *((volatile uint16 *)(0xFF800030))



#define CSIO    (1 << 14)

#define CS(x)    PDTRA = (x == 0) ? (PDTRA | 0x80) : (PDTRA & ~0x80)



void sci_init(int baud_rate)

{

    uint8 scsmr1 = 0x80, scbrr1;

    

    STBCR &= ~1;

    

    SCSCR1 = 0;

    

    if (baud_rate > 100000)

    {

        scbrr1 = (50000000 / (4 * baud_rate)) - 1;

    }

    else if (baud_rate > 15000)

    {

        scbrr1 = (50000000 / (16 * baud_rate)) - 1;

        scsmr1 = 0x81;

    }

    else if (baud_rate > 4000)

    {

        scbrr1 = (50000000 / (64 * baud_rate)) - 1;

        scsmr1 = 0x82;

    }

    else if (baud_rate > 750)

    {

        scbrr1 = (50000000 / (256 * baud_rate)) - 1;

        scsmr1 = 0x83;

    }

    else

    {

        printf("ERROR: speed %d not supported\n", baud_rate);

        return;

    }

    

    SCSMR1 = scscr1;

    SCBRR1 = scbrr1;

    

    for(int i = 0; i < 800000; i++)

        __asm__("nop");

    

    SCSCR1 = 0x30;

    

    PCTRA |= CSIO;

}



int sci_spi_rw(uint8 *in, uint8 *out, uint32 len)

{

    for (uint32 i = 0; i < len; i++)

    {

        CS(1);

        

        while (!(SCSSR1 & TDRE));

        

        SCTDR1 = in[i];

        SCSSR1 &= ~TDRE;

        

        do

        {

            if (SCSSR1 & ORER)

            {

                return -1;

            }

        } 

        while (!(SCSSR1 & RDRF));

        

        out[i] = SCRDR1;

        

        SCSSR1 &= ~RDRF;

        

        CS(0);

    }

    

    return 0;

}