ADC and I2C Test

MSP430G2452

#include <msp430.h>


char MST_Data = 0;                     // Variable for received data
char SLV_Addr = 0x90;                  // Address is 0x48<<1 for R/W
int I2C_State = 0;                     // State variable

int main(void)
{
  WDTCTL = WDTPW + WDTHOLD;            // Stop watchdog
  //if (CALBC1_1MHZ==0xFF)  		   // If calibration constants erased
  //{
  //  while(1);                          // do not load, trap CPU!!
  //}

  DCOCTL = 0;                               // Select lowest DCOx and MODx settings
  BCSCTL1 = CALBC1_1MHZ;               // Set DCO
  DCOCTL = CALDCO_1MHZ;

  P2DIR |= 0x01;                         // Set P2.0 output
  //P1OUT = BIT6 + BIT7;                 // P1.1 & P1.2 Pullups
  //P1REN |= 0xC0;                       // P1.6 & P1.7 Pullups
  P1DIR = BIT6 + BIT7;                   // Unused pins as outputs

  //P2OUT = 0;
  //P2DIR = 0xFF;

  USICTL0 = USIPE6+USIPE7+USISWRST;    // Port & USI mode setup
  USICTL1 = USII2C+USIIE+USISTTIE;     // Enable I2C mode & USI interrupts
  USICKCTL = USICKPL;                  // Setup clock polarity
  USICNT |= USIIFGCC;                  // Disable automatic clear control
  USICTL0 &= ~USISWRST;                // Enable USI
  USICTL1 &= ~USIIFG;                  // Clear pending flag
  _EINT();

  while(1)
  {
    LPM0;                              // CPU off, await USI interrupt
  }
}

//******************************************************************************
// USI interrupt service routine
//******************************************************************************
#pragma vector = USI_VECTOR
__interrupt void USI_TXRX (void)
{
  if (USICTL1 & USISTTIFG)             // Start entry?
  {
    //P1OUT |= 0x01;                     // LED on: sequence start
    I2C_State = 2;                     // Enter 1st state on start
  }

  switch(I2C_State)
    {
      case 0: // Idle, should not get here
              break;

      case 2: // RX Address
              USICNT = (USICNT & 0xE0) + 0x08; // Bit counter = 8, RX address
              USICTL1 &= ~USISTTIFG;   // Clear start flag
              I2C_State = 4;           // Go to next state: check address
              break;

      case 4: // Process Address and send (N)Ack
              if (USISRL & 0x01)       // If read...
                SLV_Addr++;            // Save R/W bit
              USICTL0 |= USIOE;        // SDA = output
              if (USISRL == SLV_Addr)  // Address match?
              {
                USISRL = 0x00;         // Send Ack
                //P1OUT &= ~0x01;        // LED off
                I2C_State = 8;         // Go to next state: RX data
              }
              else
              {
                USISRL = 0xFF;         // Send NAck
                P1OUT |= 0x01;         // LED on: error
                I2C_State = 6;         // Go to next state: prep for next Start
              }
              USICNT |= 0x01;          // Bit counter = 1, send (N)Ack bit
              break;

      case 6: // Prep for Start condition
              USICTL0 &= ~USIOE;       // SDA = input
              SLV_Addr = 0x90;         // Reset slave address
              I2C_State = 0;           // Reset state machine
              break;

      case 8: // Receive data byte
              USICTL0 &= ~USIOE;       // SDA = input
              USICNT |=  0x08;         // Bit counter = 8, RX data
              I2C_State = 10;          // Go to next state: Test data and (N)Ack
              break;

      case 10:// Check Data & TX (N)Ack
              USICTL0 |= USIOE;        // SDA = output

              if (USISRL == MST_Data)  // If data valid...
              {
                USISRL = 0x00;         // Send Ack
                //MST_Data++;            // Increment Master data
                P1OUT &= ~0x01;        // LED off
              }
              else
              {
            	  // My Code
            	  if(USISRL>=100){
            	      P2OUT |= 0x01;                     // Set P2.0 LED on
            	  }
            	  else if(USISRL<100){
            		  P2OUT &= ~0x01;                    // Clear P2.0 LED off
            	  }

                USISRL = 0xFF;         // Send NAck
                //P1OUT |= 0x01;         // LED on: error
              }
              USICNT |= 0x01;          // Bit counter = 1, send (N)Ack bit
              I2C_State = 6;           // Go to next state: prep for next Start
              break;
    }

  USICTL1 &= ~USIIFG;                  // Clear pending flags
}

MSP430G553

/* --COPYRIGHT--,BSD_EX
 * Copyright (c) 2012, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *******************************************************************************
 *
 *                       MSP430 CODE EXAMPLE DISCLAIMER
 *
 * MSP430 code examples are self-contained low-level programs that typically
 * demonstrate a single peripheral function or device feature in a highly
 * concise manner. For this the code may rely on the device's power-on default
 * register values and settings such as the clock configuration and care must
 * be taken when combining code from several examples to avoid potential side
 * effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
 * for an API functional library-approach to peripheral configuration.
 *
 * --/COPYRIGHT--*/
//******************************************************************************
//  MSP430G2x33/G2x53 Demo - ADC10, DTC Sample A1 32x, 1.5V, Repeat Single, DCO
//
//  Description: Use DTC to sample A1 32 times with reference to internal 1.5v.
//  Vref Software writes to ADC10SC to trigger sample burst. In Mainloop MSP430
//  waits in LPM0 to save power until ADC10 conversion complete, ADC10_ISR(DTC)
//  will force exit from any LPMx in Mainloop on reti. ADC10 internal
//  oscillator times sample period (16x) and conversion (13x). DTC transfers
//  conversion code to RAM 200h - 240h. P1.0 set at start of conversion burst,
//  reset on completion.
//
//                MSP430G2x33/G2x53
//             -----------------
//         /|\|              XIN|-
//          | |                 |
//          --|RST          XOUT|-
//            |                 |
//        >---|P1.1/A1      P1.0|-->LED
//
//  D. Dang
//  Texas Instruments Inc.
//  December 2010
//   Built with CCS Version 4.2.0 and IAR Embedded Workbench Version: 5.10
//******************************************************************************
#include <msp430.h>

unsigned char TXData;
unsigned char TXByteCtr;

int main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  ADC10CTL1 = CONSEQ_2+INCH_0;              // Repeat single channel P1.0
  ADC10CTL0 = SREF_0 + ADC10SHT_2 + MSC + ADC10ON + ADC10IE;
  __enable_interrupt();                     // Enable interrupts.
  TACCR0 = 30;                              // Delay to allow Ref to settle
  TACCTL0 |= CCIE;                          // Compare-mode interrupt.
  TACTL = TASSEL_2 + MC_1;                  // TACLK = SMCLK, Up mode.
  LPM0;                                     // Wait for delay.
  TACCTL0 &= ~CCIE;                         // Disable timer Interrupt
  __disable_interrupt();
  ADC10DTC1 = 0x20;                         // 32 conversions
  ADC10AE0 |= 0x01;                         // P1.0 ADC option select
  P2DIR |= 0x01;                            // Set P2.0 output

  P1SEL |= BIT6 + BIT7;                     // Assign I2C pins to USCI_B0
  P1SEL2|= BIT6 + BIT7;                     // Assign I2C pins to USCI_B0
  UCB0CTL1 |= UCSWRST;                      // Enable SW reset
  UCB0CTL0 = UCMST + UCMODE_3 + UCSYNC;     // I2C Master, synchronous mode
  UCB0CTL1 = UCSSEL_2 + UCSWRST;            // Use SMCLK, keep SW reset
  UCB0BR0 = 12;                             // fSCL = SMCLK/12 = ~100kHz
  UCB0BR1 = 0;
  UCB0I2CSA = 0x48;                         // Slave Address is 048h
  UCB0CTL1 &= ~UCSWRST;                     // Clear SW reset, resume operation
  IE2 |= UCB0TXIE;                          // Enable TX interrupt

  for (;;)
  {
    ADC10CTL0 &= ~ENC;
    while (ADC10CTL1 & BUSY);               // Wait if ADC10 core is active
    ADC10SA = 0x200;                        // Data buffer start

    ADC10CTL0 |= ENC + ADC10SC;             // Sampling and conversion start
    __bis_SR_register(GIE);          		// removed LPM0 (CPUOFF +), ADC10_ISR will force exit
    TXData = ADC10MEM;                      // Holds TX data

    TXByteCtr = 1;                          // Load TX byte counter
    while (UCB0CTL1 & UCTXSTP);             // Ensure stop condition got sent
    UCB0CTL1 |= UCTR + UCTXSTT;             // I2C TX, start condition
    __bis_SR_register(CPUOFF + GIE);        // Enter LPM0 w/ interrupts
                                            // Remain in LPM0 until all data
                                            // is TX'd

    if(ADC10MEM<400){
    P2OUT |= 0x01;                          // Set P2.0 LED on
    }
    else if(ADC10MEM>=400){
    P2OUT &= ~0x01;                         // Clear P2.0 LED off
    }
  }
}

// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR(void)
{
  __bic_SR_register_on_exit(CPUOFF);        // Clear CPUOFF bit from 0(SR)
}

#pragma vector=TIMER0_A0_VECTOR
__interrupt void ta0_isr(void)
{
  TACTL = 0;
  LPM0_EXIT;                                // Exit LPM0 on return
}

//------------------------------------------------------------------------------
// The USCIAB0TX_ISR is structured such that it can be used to transmit any
// number of bytes by pre-loading TXByteCtr with the byte count.
//------------------------------------------------------------------------------
#pragma vector = USCIAB0TX_VECTOR
__interrupt void USCIAB0TX_ISR(void)
{
  if (TXByteCtr)                            // Check TX byte counter
  {
    UCB0TXBUF = TXData;                     // Load TX buffer
    TXByteCtr--;                            // Decrement TX byte counter
  }
  else
  {
    UCB0CTL1 |= UCTXSTP;                    // I2C stop condition
    IFG2 &= ~UCB0TXIFG;                     // Clear USCI_B0 TX int flag
    __bic_SR_register_on_exit(CPUOFF);      // Exit LPM0
  }
}