readspi1.c

Microchip的官方PIC24H系列16位单片机的外设源程序库。

#include <p30fxxxx.h>
#include <spi.h>

/******************************************************************************
*     Function Name :   ReadSPI1                                              *
*     Description   :   This function will read single byte/ word  from SPI   *
                        bus. If SPI is configured for byte  communication     *
                        then upper byte of SPIBUF is masked.                  *         
*     Parameters    :   None                                                  *
*     Return Value  :   contents of SPIBUF register                           *
*******************************************************************************/

unsigned int ReadSPI1()
{         
    /* Check for Receive buffer full status bit of status register*/
    if (SPI1STATbits.SPIRBF)
    { 
        SPI1STATbits.SPIROV = 0;
                
        if (SPI1CONbits.MODE16)
            return (SPI1BUF);           /* return word read */
        else
            return (SPI1BUF & 0xff);    /* return byte read */
    }
    return -1;                  		/* RBF bit is not set return error*/
}