ti_cc_spi.c

利用MSP430F2121单片机控制无线模块CC2500的一个演示程序。

  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;        // /CS enable
  while (TI_CC_SPI_USCIB1_PxIN&TI_CC_SPI_USCIB1_SOMI);// Wait for CCxxxx ready
  IFG2 &= ~UCB1RXIFG;                       // Clear flag
  UCB1TXBUF = (addr | TI_CCxxx0_READ_BURST);// Send address
  while (!(IFG2&UCB1TXIFG));                // Wait for TXBUF ready
  UCB1TXBUF = 0;                            // Dummy write to read 1st data byte
  // Addr byte is now being TX'ed, with dummy byte to follow immediately after
  while (!(IFG2&UCB1RXIFG));                // Wait for end of addr byte TX
  IFG2 &= ~UCB1RXIFG;                       // Clear flag
  while (!(IFG2&UCB1RXIFG));                // Wait for end of 1st data byte TX
  // First data byte now in RXBUF
  for (i = 0; i < (count-1); i++)
  {
    UCB1TXBUF = 0;                          //Initiate next data RX, meanwhile..
    buffer[i] = UCB1RXBUF;                  // Store data from last data RX
    while (!(IFG2&UCB1RXIFG));              // Wait for RX to finish
  }
  buffer[count-1] = UCB1RXBUF;              // Store last RX byte in buffer
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;         // /CS disable
}

char TI_CC_SPIReadStatus(char addr)
{
  char x;

  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;        // /CS enable
  while (TI_CC_SPI_USCIB1_PxIN & TI_CC_SPI_USCIB1_SOMI);// Wait for CCxxxx ready
  IFG2 &= ~UCB1RXIFG;                       // Clear flag set during last write
  UCB1TXBUF = (addr | TI_CCxxx0_READ_BURST);// Send address
  while (!(IFG2&UCB1RXIFG));                // Wait for TX to finish
  IFG2 &= ~UCB1RXIFG;                       // Clear flag set during last write
  UCB1TXBUF = 0;                            // Dummy write so we can read data
  while (!(IFG2&UCB1RXIFG));                // Wait for RX to finish
  x = UCB1RXBUF;                            // Read data
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;         // /CS disable

  return x;
}

void TI_CC_SPIStrobe(char strobe)
{
  IFG2 &= ~UCB1RXIFG;                       // Clear flag
  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;        // /CS enable
  while (TI_CC_SPI_USCIB1_PxIN&TI_CC_SPI_USCIB1_SOMI);// Wait for CCxxxx ready
  UCB1TXBUF = strobe;                       // Send strobe
  // Strobe addr is now being TX'ed
  while (!(IFG2&UCB1RXIFG));                // Wait for end of addr TX
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;         // /CS disable
}

void TI_CC_PowerupResetCCxxxx(void)
{
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;
  TI_CC_Wait(30);
  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;
  TI_CC_Wait(30);
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;
  TI_CC_Wait(45);

  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;        // /CS enable
  while (TI_CC_SPI_USCIB1_PxIN&TI_CC_SPI_USCIB1_SOMI);// Wait for CCxxxx ready
  UCB1TXBUF = TI_CCxxx0_SRES;               // Send strobe
  // Strobe addr is now being TX'ed
  IFG2 &= ~UCB1RXIFG;                       // Clear flag
  while (!(IFG2&UCB1RXIFG));                // Wait for end of addr TX
  while (TI_CC_SPI_USCIB1_PxIN&TI_CC_SPI_USCIB1_SOMI);
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;         // /CS disable
}


#elif TI_CC_RF_SER_INTF == TI_CC_SER_INTF_USI


void TI_CC_SPISetup(void)
{
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;
  TI_CC_CSn_PxDIR |= TI_CC_CSn_PIN;         // /CS disable

  USICTL0 |= USIPE7 +  USIPE6 + USIPE5 + USIMST + USIOE;// Port, SPI master
  USICKCTL = USISSEL_2 + USICKPL;           // SCLK = SMCLK
  USICTL0 &= ~USISWRST;                     // USI released for operation

  USISRL = 0x00;                            // Ensure SDO low instead of high,
  USICNT = 1;                               // to avoid conflict with CCxxxx
}

void TI_CC_SPIWriteReg(char addr, char value)
{
  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;        // /CS enable
  while (TI_CC_SPI_USI_PxIN&TI_CC_SPI_USI_SOMI);// Wait for CCxxxx ready
  USISRL = addr;                            // Load address
  USICNT = 8;                               // Send it
  while (!(USICTL1&USIIFG));                // Wait for TX to finish
  USISRL = value;                           // Load value
  USICNT = 8;                               // Send it
  while (!(USICTL1&USIIFG));                // Wait for TX to finish
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;         // /CS disable
}

void TI_CC_SPIWriteBurstReg(char addr, char *buffer, char count)
{
  unsigned int i;

  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;        // /CS enable
  while (TI_CC_SPI_USI_PxIN&TI_CC_SPI_USI_SOMI);// Wait for CCxxxx ready
  USISRL = addr | TI_CCxxx0_WRITE_BURST;    // Load address
  USICNT = 8;                               // Send it
  while (!(USICTL1&USIIFG));                // Wait for TX to finish
  for (i = 0; i < count; i++)
  {
    USISRL = buffer[i];                     // Load data
    USICNT = 8;                             // Send it
    while (!(USICTL1&USIIFG));              // Wait for TX to finish
  }
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;         // /CS disable
}

char TI_CC_SPIReadReg(char addr)
{
  char x;

  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;        // /CS enable
  while (TI_CC_SPI_USI_PxIN&TI_CC_SPI_USI_SOMI);// Wait for CCxxxx ready
  USISRL = addr | TI_CCxxx0_READ_SINGLE;    // Load address
  USICNT = 8;                               // Send it
  while (!(USICTL1&USIIFG));                // Wait for TX to finish
  USICNT = 8;                               // Dummy write so we can read data
  while (!(USICTL1&USIIFG));                // Wait for RX to finish
  x = USISRL;                               // Store data
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;         // /CS disable

  return x;
}

void TI_CC_SPIReadBurstReg(char addr, char *buffer, char count)
{
  unsigned int i;

  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;        // /CS enable
  while (TI_CC_SPI_USI_PxIN&TI_CC_SPI_USI_SOMI);// Wait for CCxxxx ready
  USISRL = addr | TI_CCxxx0_READ_BURST;     // Load address
  USICNT = 8;                               // Send it
  while (!(USICTL1&USIIFG));                // Wait for TX to finish
  for (i = 0; i < count; i++)
  {
    USICNT = 8;                             // Dummy write so we can read data
    while (!(USICTL1&USIIFG));              // Wait for RX to finish
    buffer[i] = USISRL;                     // Store data
  }
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;         // /CS disable
}

char TI_CC_SPIReadStatus(char addr)
{
  char x;

  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;        // /CS enable
  while (TI_CC_SPI_USI_PxIN&TI_CC_SPI_USI_SOMI);// Wait for CCxxxx ready
  USISRL = addr | TI_CCxxx0_READ_BURST;     // Load address
  USICNT = 8;                               // Send it
  while (!(USICTL1&USIIFG));                // Wait for TX to finish
  USICNT = 8;                               // Dummy write so we can read data
  while (!(USICTL1&USIIFG));                // Wait for RX to finish
  x = USISRL;                               // Store data
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;         // /CS disable

  return x;
}

void TI_CC_SPIStrobe(char strobe)
{
  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;        // /CS enable
  while (TI_CC_SPI_USI_PxIN&TI_CC_SPI_USI_SOMI);// Wait for CCxxxx ready
  USISRL = strobe;                          // Load strobe
  USICNT = 8;                               // Send it
  while (!(USICTL1&USIIFG));                // Wait for TX to finish
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;         // /CS disable
}

void TI_CC_PowerupResetCCxxxx(void)
{
  // Sec. 27.1 of CC1100 datasheet
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;
  TI_CC_Wait(30);
  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;
  TI_CC_Wait(30);
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;
  TI_CC_Wait(45);

  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;
  while (TI_CC_SPI_USI_PxIN&TI_CC_SPI_USI_SOMI);
  USISRL = TI_CCxxx0_SRES;
  USICNT = 8;
  while (!(USICTL1&USIIFG));
  while (TI_CC_SPI_USI_PxIN&TI_CC_SPI_USI_SOMI);
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;
}


#elif TI_CC_RF_SER_INTF == TI_CC_SER_INTF_BITBANG

void TI_CC_SPI_bitbang_out(char);
char TI_CC_SPI_bitbang_in();

void TI_CC_SPISetup(void)
{
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;
  TI_CC_CSn_PxDIR |= TI_CC_CSn_PIN;         // /CS disable

  // Config bitbang pins
  TI_CC_SPI_BITBANG_PxOUT |= TI_CC_SPI_BITBANG_SIMO|TI_CC_SPI_BITBANG_UCLK;
  TI_CC_SPI_BITBANG_PxDIR |= TI_CC_SPI_BITBANG_SIMO | TI_CC_SPI_BITBANG_UCLK;
}

// Output eight-bit value using selected bit-bang pins
void TI_CC_SPI_bitbang_out(char value)
{
  char x;

  for(x=8;x>0;x--)
  {
    if(value & 0x80)                                     // If bit is high...
      TI_CC_SPI_BITBANG_PxOUT |= TI_CC_SPI_BITBANG_SIMO; // Set SIMO high...
    else
      TI_CC_SPI_BITBANG_PxOUT &= ~TI_CC_SPI_BITBANG_SIMO;// Set SIMO low...
    value = value << 1;                                  // Rotate bits

    TI_CC_SPI_BITBANG_PxOUT &= ~TI_CC_SPI_BITBANG_UCLK;  // Set clock low
    TI_CC_SPI_BITBANG_PxOUT |= TI_CC_SPI_BITBANG_UCLK;   // Set clock high
  }
}

// Input eight-bit value using selected bit-bang pins
char TI_CC_SPI_bitbang_in()
{
  char x=0,shift=0;
  int y;

  // Determine how many bit positions SOMI is from least-significant bit
  x = TI_CC_SPI_BITBANG_SOMI;
  while(x>1)
  {
    shift++;
    x = x >> 1;
  };

  x = 0;
  for(y=8;y>0;y--)
  {
    TI_CC_SPI_BITBANG_PxOUT &= ~TI_CC_SPI_BITBANG_UCLK;// Set clock low
    TI_CC_SPI_BITBANG_PxOUT |= TI_CC_SPI_BITBANG_UCLK;// Set clock high

    x = x << 1;                             // Make room for next bit
    x = x | ((TI_CC_SPI_BITBANG_PxIN & TI_CC_SPI_BITBANG_SOMI) >> shift);
  }                                         // Store next bit
  return(x);
}

void TI_CC_SPIWriteReg(char addr, char value)
{
    TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;      // /CS enable
    while (TI_CC_SPI_BITBANG_PxIN&TI_CC_SPI_BITBANG_SOMI); // Wait CCxxxx ready
    TI_CC_SPI_bitbang_out(addr);            // Send address
    TI_CC_SPI_bitbang_out(value);           // Send data
    TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;       // /CS disable
}

void TI_CC_SPIWriteBurstReg(char addr, char *buffer, char count)
{
    char i;

    TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;      // /CS enable
    while (TI_CC_SPI_BITBANG_PxIN&TI_CC_SPI_BITBANG_SOMI); // Wait CCxxxx ready
    TI_CC_SPI_bitbang_out(addr | TI_CCxxx0_WRITE_BURST);   // Send address
    for (i = 0; i < count; i++)
      TI_CC_SPI_bitbang_out(buffer[i]);     // Send data
    TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;       // /CS disable
}

char TI_CC_SPIReadReg(char addr)
{
  char x;

  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;        // /CS enable
  TI_CC_SPI_bitbang_out(addr | TI_CCxxx0_READ_SINGLE);//Send address
  x = TI_CC_SPI_bitbang_in();               // Read data
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;         // /CS disable

  return x;
}

void TI_CC_SPIReadBurstReg(char addr, char *buffer, char count)
{
  char i;

  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;        // /CS enable
  while (TI_CC_SPI_BITBANG_PxIN&TI_CC_SPI_BITBANG_SOMI); // Wait CCxxxx ready
  TI_CC_SPI_bitbang_out(addr | TI_CCxxx0_READ_BURST);    // Send address
  for (i = 0; i < count; i++)
    buffer[i] = TI_CC_SPI_bitbang_in();     // Read data
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;         // /CS disable
}

char TI_CC_SPIReadStatus(char addr)
{
  char x;

  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;        // /CS enable
  while (TI_CC_SPI_BITBANG_PxIN & TI_CC_SPI_BITBANG_SOMI); // Wait CCxxxx ready
  TI_CC_SPI_bitbang_out(addr | TI_CCxxx0_READ_BURST);      // Send address
  x = TI_CC_SPI_bitbang_in();               // Read data
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;         // /CS disable

  return x;
}

void TI_CC_SPIStrobe(char strobe)
{
  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;        // /CS enable
  while (TI_CC_SPI_BITBANG_PxIN&TI_CC_SPI_BITBANG_SOMI);// Wait for CCxxxx ready
  TI_CC_SPI_bitbang_out(strobe);            // Send strobe
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;         // /CS disable
}

void TI_CC_PowerupResetCCxxxx(void)
{
  // Sec. 27.1 of CC1100 datasheet
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;
  TI_CC_Wait(30);
  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;
  TI_CC_Wait(30);
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;
  TI_CC_Wait(45);

  TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN;
  while (TI_CC_SPI_BITBANG_PxIN&TI_CC_SPI_BITBANG_SOMI);
  TI_CC_SPI_bitbang_out(TI_CCxxx0_SRES);
  while (TI_CC_SPI_BITBANG_PxIN&TI_CC_SPI_BITBANG_SOMI);
  TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN;
}
#endif