readspi2.c

来自「基於 c51/8051 的 nand Flash Memory HY27US08」· C语言 代码 · 共 36 行

#if defined(__PIC24F__)
#include <p24Fxxxx.h>
#endif
#include "spi.h"

/******************************************************************************
*     Function Name :   ReadSPI2                                              *
*     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                           *
******************************************************************************/
#ifdef _SPI_V2_2

/* The following devices support SPI2 */

unsigned int ReadSPI2()
{         
    /* Check for Receive buffer full status bit of status register*/
    if (SPI2STATbits.SPIRBF)
    {
        SPI2STATbits.SPIROV = 0;
                
        if (SPI2CON1bits.MODE16)
            return ( SPI2BUF );        /* return word read */
        else
            return (SPI2BUF & 0xff);   /* return byte read */
    }
	return -1;                         /* RBF bit is not set return error*/
}

#else
#warning "Does not build on this target"
#endif