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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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#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 */