#include "spi.h"
#include "gpio.h"

void SPI3_Init(void)
{
		CMU_PERCLK_SetableEx(PADCLK, ENABLE);  //PADʱÖÓ£¨GPIO£©Ê¹Äܺ¯Êý
		
//    AltFunIO(GPIOF, GPIO_Pin_15, ALTFUN_NORMAL);    // SSN


    AltFunIO(SPI3_PORT, SPI3_SCK_PIN, ALTFUN_NORMAL);    // SCK
    AltFunIO(SPI3_PORT, SPI3_MISO_PIN, ALTFUN_NORMAL);    // MISO
    AltFunIO(SPI3_PORT, SPI3_MOSI_PIN, ALTFUN_NORMAL);    // MOSI
	
		CMU_PERCLK_SetableEx(SPI3CLK, ENABLE);   //¿ªÆôSPI3×ÜÏßʱÖÓ

		SPIx_CR1_IOSWAP_Set(SPI3, SPIx_CR1_IOSWAP_DEFAULT);  // MISO¡¢MOSIĬÈÏÒý½Å ²»½»»»
		SPIx_CR1_MM_Set(SPI3, SPIx_CR1_MM_MASTER);           //masterģʽ
		SPIx_CR1_WAIT_Set(SPI3, SPIx_CR1_WAIT_1WAIT);        // ÿ·¢ËÍÍêÒ»Ö¡ºó²åÈëÒ»¸öCLK
		SPIx_CR1_BAUD_Set(SPI3, SPIx_CR1_BAUD_DIV4);         //²¨ÌØÂÊÉèÖÃΪÍâÉèʱÖÓ2·ÖƵ
		SPIx_CR1_LSBF_Set(SPI3, SPIx_CR1_LSBF_MSB);          //Ö¡¸ñʽÏÈ·¢ËÍMSB
		SPIx_CR1_CPHOL_Set(SPI3, SPIx_CR1_CPHOL_LOW);        //CLKÍ£Ö¹Ôڵ͵çƽ
		SPIx_CR1_CPHA_Set(SPI3, SPIx_CR1_CPHA_1CLOCK);       //µÚÒ»¸öʱÖÓ±ßÑز¶×½
		SPIx_CR2_SSNSEN_Setable(SPI3, DISABLE);                 //SSNÓÉÓ²¼þ¿ØÖÆ

		SPIx_CR2_RXO_Setable(SPI3, DISABLE);                 //SPIÉèÖÃΪȫ˫¹¤
		SPIx_CR2_DLEN_Set(SPI3, SPIx_CR2_DLEN_8BIT);         //ͨÐÅÊý¾Ý×Ö³¤8bit
		SPIx_CR2_HALFDUPLEX_Set(SPI3, SPIx_CR2_HALFDUPLEX_SPI); //SPIÉèÖÃΪ±ê×¼SPIģʽ
		SPIx_CR2_SSNM_Set(SPI3, SPIx_CR2_SSNM_LOW);             //ÿ´Î·¢Íêmasterºóssn±£³ÖµÍ
		SPIx_CR2_TXO_AC_Setable(SPI3, DISABLE);                 //¹Ø±ÕTXONLY×Ô¶¯Çå0
		SPIx_CR2_TXO_Setable(SPI3, DISABLE);                    //¹Ø±ÕTXONLYģʽ
	//	SPIx_CR2_SSN_Set(SPI3, SPIx_CR2_SSN_HIGH);               //SSNSENΪ£±Ê±SNNÊä³ö¸ßµçƽ
		
		SPIx_CR3_SERRC_Clr(SPI3);             //Çå³ý´Ó»ú´íÎó±êÖ¾
		SPIx_CR3_MERRC_Clr(SPI3);             //Çå³ýÖ÷»ú´íÎó±êÖ¾
		SPIx_CR3_RXBFC_Clr(SPI3);             //Çå³ýRXBUF
		SPIx_CR3_TXBFC_Clr(SPI3);             //Çå³ýTXBUF
    
    SPIx_CR2_SPIEN_Setable(SPI3, ENABLE);          //ʹÄÜSPI3
}

uint8_t SpiWriteAndRead(uint32_t data)
{
    SPIx_TXBUF_Write(SPI3, data);
    while (!SPIx_ISR_TXBE_Chk(SPI3));
    while (!SPIx_ISR_RXBF_Chk(SPI3));
    data = SPIx_RXBUF_Read(SPI3);
    
    return data;
}

void SpiWrite(uint8_t *data, uint32_t length)
{
    while (length--)
    {
        SpiWriteAndRead(*data);
        data++;
    }
}

void SpiRead(uint8_t *data, uint32_t length)
{
    while (length--)
    {
        *data = SpiWriteAndRead(0x00);
        data++;
    }
}