CCS/MSP430FR2433: MSP430FR2433 I2C multi-bytes receive using interupt

Tool/software: Code Composer Studio

Dear sir/madam

I have a project work with MSP430FR2433 and LIS3DSH

I search some code in internet and edited it.The problems is if I read ONE byte, it worked. I sent WHO IS command and the sensor sent exactly byte I want.

But if I've tried read multi bytes. The sensor sent wrong data and after that, If I read one byte, it sent wrong data, too.

My code is here.

Could you help me to fix my code?

/*
 * User_I2C.h
 *
 *  Created on: Sep 26, 2018
 *      Author: Dzung
 */

#ifndef USER_I2C_H_
#define USER_I2C_H_

#define MAX_BUFFER_SIZE     20

//******************************************************************************
// General I2C State Machine ***************************************************
//******************************************************************************

typedef enum I2C_ModeEnum{
    IDLE_MODE,
    NACK_MODE,
    TX_REG_ADDRESS_MODE,
    RX_REG_ADDRESS_MODE,
    TX_DATA_MODE,
    RX_DATA_MODE,
    SWITCH_TO_RX_MODE,
    SWITHC_TO_TX_MODE,
    TIMEOUT_MODE,
    SCAN_MODE
} I2C_Mode;


/* Used to track the state of the software state machine*/
I2C_Mode MasterMode = IDLE_MODE;

/* The Register Address/Command to use*/
uint8_t TransmitRegAddr = 0;

/* ReceiveBuffer: Buffer used to receive data in the ISR
 * RXByteCtr: Number of bytes left to receive
 * ReceiveIndex: The index of the next byte to be received in ReceiveBuffer
 * TransmitBuffer: Buffer used to transmit data in the ISR
 * TXByteCtr: Number of bytes left to transfer
 * TransmitIndex: The index of the next byte to be transmitted in TransmitBuffer
 * */
uint8_t ReceiveBuffer[MAX_BUFFER_SIZE] = {0};
uint8_t RXByteCtr = 0;
uint8_t ReceiveIndex = 0;
uint8_t TransmitBuffer[MAX_BUFFER_SIZE] = {0};
uint8_t TXByteCtr = 0;
uint8_t TransmitIndex = 0;

void CopyArray(uint8_t *source, uint8_t *dest, uint8_t count)
{
    uint8_t copyIndex = 0;
    for (copyIndex = 0; copyIndex < count; copyIndex++)
    {
        dest[copyIndex] = source[copyIndex];
    }
}

I2C_Mode I2C_Master_ReadReg(uint8_t dev_addr, uint8_t reg_addr, uint8_t count)
{
    // Initialize state machine
    MasterMode = TX_REG_ADDRESS_MODE;
    TransmitRegAddr = reg_addr;
    RXByteCtr = count;
    TXByteCtr = 0;
    ReceiveIndex = 0;
    TransmitIndex = 0;

    // Initialize slave address and interrupts
    UCB0I2CSA = dev_addr;
    UCB0IFG &= ~(UCTXIFG + UCRXIFG);    // Clear any pending interrupts
    UCB0IE &= ~UCRXIE;                  // Disable RX interrupt
    UCB0IE |= UCTXIE;                   // Enable TX interrupt
    //
    UCB0CTLW0 |= UCTR + UCTXSTT;        // I2C TX, start condition
    __bis_SR_register(LPM0_bits + GIE); // Enter LPM0 w/ interrupts

    return MasterMode;
}

void I2C_readByte(uint8_t devAddr, uint8_t regAddr, uint8_t* data)
{
    I2C_Master_ReadReg(devAddr, regAddr, 1);
    CopyArray(ReceiveBuffer, data, 1);
}

void I2C_readBytes(uint8_t devAddr, uint8_t regAddr, uint8_t* data, uint8_t length)
{
    I2C_Master_ReadReg(devAddr, regAddr, length);
    CopyArray(ReceiveBuffer, data, length);
}


I2C_Mode I2C_Master_WriteReg(uint8_t dev_addr, uint8_t reg_addr, uint8_t *reg_data, uint8_t count)
{
    // Initialize state machine
    MasterMode = TX_REG_ADDRESS_MODE;
    TransmitRegAddr = reg_addr;

    //Copy register data to TransmitBuffer
    CopyArray(reg_data, TransmitBuffer, count);

    TXByteCtr = count;
    RXByteCtr = 0;
    ReceiveIndex = 0;
    TransmitIndex = 0;

    // Initialize slave address and interrupts
    UCB0I2CSA = dev_addr;
    UCB0IFG &= ~(UCTXIFG + UCRXIFG);    // Clear any pending interrupts
    UCB0IE &= ~UCRXIE;                  // Disable RX interrupt
    UCB0IE |= UCTXIE;                   // Enable TX interrupt
    //
    UCB0CTLW0 |= UCTR + UCTXSTT;        // I2C TX, start condition
    __bis_SR_register(LPM0_bits + GIE); // Enter LPM0 w/ interrupts

    return MasterMode;
}

void I2C_writeByte(uint8_t devAddr, uint8_t regAddr, uint8_t data)
{
    I2C_Master_WriteReg(devAddr, regAddr, &data, 1);
}

void I2C_Init(void)
{
    // I2C pins
    P1SEL0 |= BIT2 + BIT3;
    P1SEL1 &= ~(BIT2 | BIT3);

    UCB0CTLW0 = UCSWRST;        // Enable SW reset
    UCB0CTLW0 |= UCMODE_3 | UCMST | UCSSEL__SMCLK | UCSYNC; // I2C master mode, SMCLK
    UCB0BRW = 3;                // fSCL = SMCLK/160 = ~100kHz
    UCB0CTLW0 &= ~UCSWRST;      // Clear SW reset, resume operation
    UCB0IE |= UCNACKIE;
}

//******************************************************************************
// I2C Interrupt ***************************************************************
//******************************************************************************

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector = USCI_B0_VECTOR
__interrupt void USCI_B0_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCI_B0_VECTOR))) USCI_B0_ISR (void)
#else
#error Compiler not supported!
#endif
{
  //Must read from UCB0RXBUF
  uint8_t rx_val = 0;
  switch(__even_in_range(UCB0IV, USCI_I2C_UCBIT9IFG))
  {
    case USCI_NONE:          break;         // Vector 0: No interrupts
    case USCI_I2C_UCALIFG:   break;         // Vector 2: ALIFG
    case USCI_I2C_UCNACKIFG:                // Vector 4: NACKIFG
      break;
    case USCI_I2C_UCSTTIFG:  break;         // Vector 6: STTIFG
    case USCI_I2C_UCSTPIFG:  break;         // Vector 8: STPIFG
    case USCI_I2C_UCRXIFG3:  break;         // Vector 10: RXIFG3
    case USCI_I2C_UCTXIFG3:  break;         // Vector 12: TXIFG3
    case USCI_I2C_UCRXIFG2:  break;         // Vector 14: RXIFG2
    case USCI_I2C_UCTXIFG2:  break;         // Vector 16: TXIFG2
    case USCI_I2C_UCRXIFG1:  break;         // Vector 18: RXIFG1
    case USCI_I2C_UCTXIFG1:  break;         // Vector 20: TXIFG1
    case USCI_I2C_UCRXIFG0:                 // Vector 22: RXIFG0
        rx_val = UCB0RXBUF;
        if (RXByteCtr)
        {
          ReceiveBuffer[ReceiveIndex++] = rx_val;
          RXByteCtr--;
        }
        if (RXByteCtr == 1)
        {
          UCB0CTLW0 |= UCTXSTP; //UCTXSTP;
        }
        else if (RXByteCtr == 0)
        {
          UCB0IE &= ~UCRXIE;
          MasterMode = IDLE_MODE;
          __bic_SR_register_on_exit(CPUOFF);// Exit LPM0
        }
        break;
    case USCI_I2C_UCTXIFG0:                 // Vector 24: TXIFG0
        switch (MasterMode)
        {
          case TX_REG_ADDRESS_MODE:
              UCB0TXBUF = TransmitRegAddr;
              if (RXByteCtr)
                  MasterMode = SWITCH_TO_RX_MODE;   // Need to start receiving now
              else
                  MasterMode = TX_DATA_MODE;        // Continue to transmision with the data in Transmit Buffer
              break;

          case SWITCH_TO_RX_MODE:
              UCB0IE |= UCRXIE;             // Enable RX interrupt
              UCB0IE &= ~UCTXIE;            // Disable TX interrupt
              UCB0CTLW0 &= ~UCTR;           // Switch to receiver
              MasterMode = RX_DATA_MODE;    // State state is to receive data
              UCB0CTLW0 |= UCTXSTT;         // Send repeated start
              if (RXByteCtr == 1)
              {
                  //Must send stop since this is the N-1 byte
                  while((UCB0CTLW0 & UCTXSTT));
                  UCB0CTLW0 |= UCTXSTP;     // Send stop condition
              }
              break;

          case TX_DATA_MODE:
              if (TXByteCtr)
              {
                  UCB0TXBUF = TransmitBuffer[TransmitIndex++];
                  TXByteCtr--;
              }
              else
              {
                  //Done with transmission
                  UCB0CTLW0 |= UCTXSTP;                 // Send stop condition
                  MasterMode = IDLE_MODE;
                  UCB0IE &= ~UCTXIE;                    // disable TX interrupt
                  __bic_SR_register_on_exit(CPUOFF);    // Exit LPM0
              }
              break;

          default:
              __no_operation();
              break;
        }
        break;
    default: break;
  }
}

#endif /* USER_I2C_H_ */