spi.c

ipod无线遥控发送端,可控制播放,暂停,音量,前进,后退.

#include "hal.h"


void SpiWriteBurstReg(BYTE addr, BYTE *buf, BYTE n) 
{
    CLR_CSN;
    while (SOREAD);
    SPDR = addr | WRITE_BURST;
    SPI_WAIT();
    for (BYTE i = 0; i < n; i++) {
        SPDR = buf[i];
        SPI_WAIT();
    }
    SET_CSN;
}

void SpiWriteReg(BYTE addr, BYTE value) 
{
    CLR_CSN;
    while (SOREAD);
    SPDR = addr;
    SPI_WAIT();
    SPDR = value;
    SPI_WAIT();
    SET_CSN;
}

void SpiStrobe(BYTE strobe)
{
    CLR_CSN;
    while (SOREAD);
    SPDR = strobe;
    SPI_WAIT();
    SET_CSN;
}

BYTE SpiReadStatus(BYTE addr) 
{
    BYTE x;
    CLR_CSN;
    while (SOREAD);
    SPDR = (addr | READ_BURST);
    SPI_WAIT();
    SPDR = 0;
    SPI_WAIT();
    x = SPDR;
    SET_CSN;
    return x;
}

BYTE SpiReadReg(BYTE addr) 
{
    BYTE x;
    CLR_CSN;
    while (SOREAD);
    SPDR = (addr | READ_SINGLE);
    SPI_WAIT();
    SPDR = 0;
    SPI_WAIT();
    x = SPDR;
    SET_CSN;
    return x;
}

void SpiReadBurstReg(BYTE addr, BYTE *buf, BYTE n) 
{
    CLR_CSN;
    while (SOREAD);
    SPDR = (addr | READ_BURST);
    SPI_WAIT();  
    for (BYTE i = 0; i < n; i++) {
        SPDR = 0;
        SPI_WAIT();
        buf[i] = SPDR;
    }
    SET_CSN;
}