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//----------------------------------------------------------------------------

//  This file contains functions that allow the MSP430 device to access the

//  SPI interface.  There are multiple instances of each function; 

//  the one to be compiled is selected by the system variable

//  SPI_SER_INTF, defined in "hal_hardware_board.h".

//----------------------------------------------------------------------------

//----------------------------------------------------------------------------

//  void halSPISetup(void)

//

//  DESCRIPTION:

//  Configures the assigned interface to function as a SPI port and

//  initializes it.

//----------------------------------------------------------------------------

//  void halSPIWriteReg(char addr, char value)

//

//  DESCRIPTION:

//  Writes "value" to a single configuration register at address "addr".

//----------------------------------------------------------------------------

//  void halSPIWriteBurstReg(char addr, char *buffer, char count)

//

//  DESCRIPTION:

//  Writes values to multiple configuration registers, the first register being

//  at address "addr".  First data byte is at "buffer", and both addr and

//  buffer are incremented sequentially (within the CCxxxx and MSP430,

//  respectively) until "count" writes have been performed.

//----------------------------------------------------------------------------

//  char halSPIReadReg(char addr)

//

//  DESCRIPTION:

//  Reads a single configuration register at address "addr" and returns the

//  value read.

//----------------------------------------------------------------------------

//  void halSPIReadBurstReg(char addr, char *buffer, char count)

//

//  DESCRIPTION:

//  Reads multiple configuration registers, the first register being at address

//  "addr".  Values read are deposited sequentially starting at address

//  "buffer", until "count" registers have been read.

//----------------------------------------------------------------------------

//  char halSPIReadStatus(char addr)

//

//  DESCRIPTION:

//  Special read function for reading status registers.  Reads status register

//  at register "addr" and returns the value read.

//----------------------------------------------------------------------------

//  void halSPIStrobe(char strobe)

//

//  DESCRIPTION:

//  Special write function for writing to command strobe registers.  Writes

//  to the strobe at address "addr".

//----------------------------------------------------------------------------

/* ***********************************************************

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* YOUR USE OF THE PROGRAM EXCEED FIVE HUNDRED DOLLARS 

* (U.S.$500).

*

* Unless otherwise stated, the Program written and copyrighted 

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* only under TI's copyright in the Program, use and modify the 

* Program without any charge or restriction.  You may 

* distribute to third parties, provided that you transfer a 

* copy of this license to the third party and the third party 

* agrees to these terms by its first use of the Program. You 

* must reproduce the copyright notice and any other legend of 

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*

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* copyrighted material, trade secrets and other TI proprietary 

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* well as other intellectual property laws.  To protect TI's 

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* that in no event will you alter, remove or destroy any 

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*

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* ********************************************************* */

#ifndef _SPILIB_C

#define _SPILIB_C

//

//---------------------------------------------------------------

#include "hal_SPI.h"

#include "hal_hardware_board.h"

//#define withDMA

// SPI port functions

#if SPI_SER_INTF == SER_INTF_USART0

void halSPISetup(void)

{

    UCTL0 = CHAR + SYNC + MM + SWRST;         // 8-bit SPI Master **SWRST**

    UTCTL0 = CKPL + SSEL1 + SSEL0 + STC;      // SMCLK, 3-pin mode

    UBR00 = 0x02;                             // UCLK/2

    UBR10 = 0x00;                             // 0

    UMCTL0 = 0x00;                            // No modulation

    ME1 |= USPIE0;                            // Enable USART0 SPI mode

    UCTL0 &= ~SWRST;                          // Initialize USART state machine

}

#elif SPI_SER_INTF == SER_INTF_USART1

void halSPISetup(void)

{

    UCTL1 = CHAR + SYNC + MM + SWRST;         // 8-bit SPI Master **SWRST**

    UTCTL1 = CKPL + SSEL1 + SSEL0 + STC;      // SMCLK, 3-pin mode

    UBR01 = 0x02;                             // UCLK/2

    UBR11 = 0x00;                             // 0

    UMCTL1 = 0x00;                            // No modulation

    ME2 |= USPIE1;                            // Enable USART1 SPI mode

    UCTL1 &= ~SWRST;                          // Initialize USART state machine

}

#elif SPI_SER_INTF == SER_INTF_USCIA0

void halSPISetup(void)

{

    UCA0CTL0 = UCMST+UCCKPL+UCMSB+UCSYNC;     // 3-pin, 8-bit SPI master

    UCA0CTL1 = UCSSEL_2 + UCSWRST;            // SMCLK

    halSPISetSpeedLow();

    UCA0MCTL = 0;

    SPI_PxSEL |= SPI_UCLK+SPI_SOMI+SPI_SIMO;

	SPI_PxSEL2 |= SPI_UCLK+SPI_SOMI+SPI_SIMO;

	SPI_PxOUT |= SPI_SIMO + SPI_SOMI + SPI_UCLK;

	SPI_PxDIR |= SPI_SIMO + SPI_UCLK;

	SPI_PxDIR &= ~SPI_SOMI;

    UCA0CTL1 &= ~UCSWRST;                     // **Initialize USCI state machine**

}

void halSPISetSpeedHigh(void) {

    UCA0BR0 = 4;    // CLK_FREQ = BRCLK / 4

    UCA0BR1 = 0;

}

void halSPISetSpeedLow(void) {

    UCA0BR0 = 32;   // CLK_FREQ = BRCLK / 32

    UCA0BR1 = 0;

}

#elif SPI_SER_INTF == SER_INTF_USCIA1

void halSPISetup(void)

{

    UCA1CTL0 = UCMST+UCCKPL+UCMSB+UCSYNC;     // 3-pin, 8-bit SPI master

    UCA1CTL1 = UCSSEL_2 + UCSWRST;            // SMCLK

    halSPISetSpeedLow();

    UCA1MCTL = 0;

    UCA1CTL1 &= ~UCSWRST;                     // **Initialize USCI state machine**

}

void halSPISetSpeedHigh(void) {

    UCA1BR0 = 4;    // CLK_FREQ = BRCLK / 4

    UCA1BR1 = 0;

}

void halSPISetSpeedLow(void) {

    UCA1BR0 = 32;   // CLK_FREQ = BRCLK / 32

    UCA1BR1 = 0;

}

#elif SPI_SER_INTF == SER_INTF_USCIB0

void halSPISetup(void)

{

    UCB0CTL0 = UCMSB+UCMST+UCMODE_0;			// 3-pin, 8-bit SPI master

    halSPISetPolarityPhase(0, 0);

    UCB0CTL1 = UCSSEL_2+UCSWRST;				// SMCLK

    halSPISetSpeedLow();

    //UCB0MCTL = 0;

    SPI_PxSEL |= SPI_UCLK+SPI_SOMI+SPI_SIMO;

	SPI_PxSEL2 |= SPI_UCLK+SPI_SOMI+SPI_SIMO;

    UCB0CTL1 &= ~UCSWRST;						// **Initialize USCI state machine**

}

void halSPISetSpeedHigh(void) {

    UCB0BR0 = 4;    // CLK_FREQ = BRCLK / 4

    UCB0BR1 = 0;

}

void halSPISetSpeedLow(void) {

    UCB0BR0 = 32;   // CLK_FREQ = BRCLK / 32

    UCB0BR1 = 0;

}

void halSPISetPolarityPhase(char polarity, char phase) {

	// Polarity 0 = inactive low, Polarity 1 = inactive high

	// Phase 0 = Capture on first edge, change on following edge

	// Phase 1 = Change on first edge, capture on following edge

	// Note: Phase is inverted on MSP430!

	UCB0CTL0 &= ~(UCCKPH + UCCKPL);

	if (polarity == 0 && phase == 0) {

		UCB0CTL0 |= UCCKPH;

	} else if (polarity == 1 && phase == 0) {

		UCB0CTL0 |= UCCKPH + UCCKPL;

	} else if (polarity == 1 && phase == 1) {

		UCB0CTL0 |= UCCKPL;

	}

}

#elif SPI_SER_INTF == SER_INTF_USCIB1

void halSPISetup(void)

{

    UCB1CTL0 = UCMST+UCCKPL+UCMSB+UCSYNC;     // 3-pin, 8-bit SPI master

    UCB1CTL1 = UCSSEL_2+UCSWRST;              // SMCLK

    halSPISetSpeedLow();

    UCB1MCTL = 0;

    UCB1CTL1 &= ~UCSWRST;                     // **Initialize USCI state machine**

}

void halSPISetSpeedHigh(void) {

    UCB1BR0 = 4;    // CLK_FREQ = BRCLK / 4

    UCB1BR1 = 0;

}

void halSPISetSpeedLow(void) {

    UCB1BR0 = 32;   // CLK_FREQ = BRCLK / 32

    UCB1BR1 = 0;

}

#elif SPI_SER_INTF == SER_INTF_USI

void halSPISetup(void)

{

    USICTL0 = USIPE7+USIPE6+USIPE5+USIMST+USIGE+USIOE+USISWRST; // Port, SPI master

    USICKCTL = USISSEL_2;                     // SCLK = SMCLK

    USICTL0 &= ~USISWRST;                     // USI released for operation

//  USISRL = 0x00;                            // Ensure SDO low instead of high,

//  USICNT = 1;                               // to avoid conflict with CCxxxx

}

void halSPISetSpeedHigh(void) {

    USICKCTL = (USICKCTL & 0x1F) | USIDIV_2;    // CLK_FREQ = BRCLK / 4

}

void halSPISetSpeedLow(void) {

    USICKCTL = (USICKCTL & 0x1F) | USIDIV_5;    // CLK_FREQ = BRCLK / 32

}

#elif SPI_SER_INTF == SER_INTF_BITBANG

void spi_bitbang_out(unsigned char);

unsigned char spi_bitbang_in();

unsigned char spi_bitbang_in_data;

void halSPISetup(void)

{

}

// Output eight-bit value using selected bit-bang pins

void spi_bitbang_out(unsigned char value)

{

    char x;

    for(x=8;x>0;x--)

    {

        if(value & 0x80)                        // If bit is high...

            MMC_PxOUT |= MMC_SIMO;// Set SIMO high...

        else

            MMC_PxOUT &= ~MMC_SIMO;//Set SIMO low...

        value = value << 1;                     // Rotate bits

        MMC_PxOUT &= ~MMC_UCLK; // Set clock low

        MMC_PxOUT |= MMC_UCLK;  // Set clock high

    }

}

// Input eight-bit value using selected bit-bang pins

unsigned char spi_bitbang_in()

{

    char x=0;

    int y;

    for(y=8;y>0;y--)

    {

        MMC_PxOUT &= ~MMC_UCLK; // Set clock low

        MMC_PxOUT |= MMC_UCLK;  // Set clock high

        x = x << 1;                             // Rotate bits

        if(MMC_PxIN & MMC_SOMI)                 // If bit is high...

            x |= 0x01;                            // input bit high

    }

    spi_bitbang_in_data = x;

    return(x);

}

// Input eight-bit value using selected bit-bang pins

unsigned char spi_bitbang_inout(unsigned char value)

{

    char x=0;

    int y;

    for(y=8;y>0;y--)

    {

        if(value & 0x80)                        // If bit is high...

            MMC_PxOUT |= MMC_SIMO;// Set SIMO high...

        else

            MMC_PxOUT &= ~MMC_SIMO;//Set SIMO low...

        value = value << 1;                     // Rotate bits

        MMC_PxOUT &= ~MMC_UCLK; // Set clock low

        MMC_PxOUT |= MMC_UCLK;  // Set clock high

        x = x << 1;                             // Rotate bits

        if(MMC_PxIN & MMC_SOMI)                 // If bit is high...

            x |= 0x01;                            // input bit high

    }

    spi_bitbang_in_data = x;

    return(x);

}

#endif

//Send one byte via SPI

unsigned char spiSendByte(const unsigned char data)

{

    while (halSPITXREADY == 0); // wait while not ready for TX

    halSPI_SEND(data); // write

    while (halSPIRXREADY == 0); // wait for RX buffer (full)

    return (halSPIRXBUF);

}

//Read a frame of bytes via SPI

unsigned char spiReadFrame(unsigned char* pBuffer, unsigned int size)

{

#ifndef withDMA

    unsigned long i = 0;

    // clock the actual data transfer and receive the bytes; spi_read automatically finds the Data Block

    for (i = 0; i < size; i++){

        while (halSPITXREADY == 0);   // wait while not ready for TX

        halSPI_SEND(DUMMY_CHAR);     // dummy write

        while (halSPIRXREADY == 0);   // wait for RX buffer (full)

        pBuffer[i] = halSPIRXBUF;

    }

#else

                U1IFG &= ~(URXIFG1 + URXIFG1);      /* clear flags */

                /* Get the block */

                /* DMA trigger is UART1 receive for both DMA0 and DMA1 */

                DMACTL0 &= ~(DMA0TSEL_15 | DMA1TSEL_15);

                DMACTL0 |= (DMA0TSEL_9 | DMA1TSEL_9);

                /* Source DMA address: receive register.  */

                DMA0SA = U1RXBUF_;

                /* Destination DMA address: the user data buffer. */

                DMA0DA = (unsigned short)pBuffer;

                /* The size of the block to be transferred */

                DMA0SZ = size;

                /* Configure the DMA transfer*/

                DMA0CTL =

                    DMAIE   |                         /* Enable interrupt */

                    DMADT_0 |                         /* Single transfer mode */

                    DMASBDB |                         /* Byte mode */

                    DMAEN |                           /* Enable DMA */

                    DMADSTINCR1 | DMADSTINCR0;        /* Increment the destination address */

                /* We depend on the DMA priorities here.  Both triggers occur at

                     the same time, since the source is identical.  DMA0 is handled

                     first, and retrieves the byte.  DMA1 is triggered next, and

                     sends the next byte. */

                /* Source DMA address: constant 0xFF (don't increment)*/

                DMA1SA = U1TXBUF_;

                /* Destination DMA address: the transmit buffer. */

                DMA1DA = U1TXBUF_;

                /* Increment the destination address */

                /* The size of the block to be transferred */

                DMA1SZ = count-1;

                /* Configure the DMA transfer*/

                DMA1CTL =

                    DMADT_0 |                         /* Single transfer mode */

                    DMASBDB |                         /* Byte mode */

                    DMAEN;                            /* Enable DMA */

                /* Kick off the transfer by sending the first byte */

                halMMC_SEND(0xFF);

                _EINT(); LPM0;  // wait till done

#endif

    return(0);

}

//Send a frame of bytes via SPI

unsigned char spiSendFrame(unsigned char* pBuffer, unsigned int size)

{

#ifndef withDMA

    unsigned long i = 0;

    // clock the actual data transfer and receive the bytes; spi_read automatically finds the Data Block

    for (i = 0; i < size; i++){

        while (halSPITXREADY ==0);   // wait while not ready for TX

        halSPI_SEND(pBuffer[i]);     // write

        while (halSPIRXREADY ==0);  // wait for RX buffer (full)

        pBuffer[i] = halSPIRXBUF;

    }

#else

            /* Get the block */

            /* DMA trigger is UART send */

            DMACTL0 &= ~(DMA0TSEL_15);

            DMACTL0 |= (DMA0TSEL_9);

            /* Source DMA address: the data buffer.  */

            DMA0SA = (unsigned short)pBuffer;

            /* Destination DMA address: the UART send register. */

            DMA0DA = U1TXBUF_;

            /* The size of the block to be transferred */

            DMA0SZ = count;

            /* Configure the DMA transfer*/

            DMA0CTL =

                DMAREQ  |                           /* start transfer */

                DMADT_0 |                           /* Single transfer mode */

                DMASBDB |                           /* Byte mode */

                DMAEN |                             /* Enable DMA */

                DMASRCINCR1 | DMASRCINCR0;          /* Increment the source address */

#endif

    return(0);

}

#ifdef withDMA

#ifdef __IAR_SYSTEMS_ICC__

#if __VER__ < 200

interrupt[DACDMA_VECTOR] void DMA_isr(void)

#else

#pragma vector = DACDMA_VECTOR

__interrupt void DMA_isr(void)

#endif

#endif

#ifdef __CROSSWORKS__

void DMA_isr(void)   __interrupt[DACDMA_VECTOR]

#endif

#ifdef __TI_COMPILER_VERSION__

__interrupt void DMA_isr(void);

DMA_ISR(DMA_isr)

__interrupt void DMA_isr(void)

#endif

{

    DMA0CTL &= ~(DMAIFG);

    LPM3_EXIT;

}

#endif

//---------------------------------------------------------------------

#endif /* _SPILIB_C */