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//******************************************************************************
//! This example shows how to configure the UART module as the loopback to
//! verify that received data is sent data.
//!
//!               MSP430F5438A
//!             -----------------
//!       RST -|     P3.4/UCA0TXD|----|
//!            |                 |    |
//!            |                 |    |
//!            |     P3.5/UCA0RXD|----|
//!            |                 |
//!
//!
//! This example uses the following peripherals and I/O signals.  You must
//! review these and change as needed for your own board:
//! - UART peripheral
//! - GPIO Port peripheral (for UART pins)
//! - UCA0TXD
//! - UCA0RXD
//!
//! This example uses the following interrupt handlers.  To use this example
//! in your own application you must add these interrupt handlers to your
//! vector table.
//! - USCI_A0_VECTOR.
//******************************************************************************
#include "driverlib.h"
#include <RingBuf.h>
//*****************************************************************************
//
//Select Baud rate
//
//*****************************************************************************
#define BAUD_RATE                               9600
//*****************************************************************************
//
//Initialize received data
//
//*****************************************************************************
volatile uint8_t receivedData = 0xAA;
//*****************************************************************************
//
//Initialize trasnmit data
//
//*****************************************************************************
uint8_t transmitData = 0x00;

uint8_t check = 0;

volatile uint16_t timer_count = 0;
uint16_t timeout = 5; //³¬Ê±5ms
uint8_t rxbuf[128] = {0};
volatile uint8_t state = 0x00;
uint8_t txbuf[128] = {1};
RingBuf_Object uart1;
RingBuf_Handle handle = &uart1;
    
void main(void)
{
    //Stop WDT
    WDT_A_hold(WDT_A_BASE);
    
    
    
    RingBuf_construct(handle, (uint8_t*)rxbuf, 128);
    
    //P3.4,5 = USCI_A0 TXD/RXD
    GPIO_setAsPeripheralModuleFunctionInputPin(
        GPIO_PORT_P9,
        GPIO_PIN4 + GPIO_PIN5
        );

    //Baudrate = 9600, clock freq = 1.048MHz
    //UCBRx = 109, UCBRFx = 0, UCBRSx = 2, UCOS16 = 0
    USCI_A_UART_initParam param = {0};
    param.selectClockSource = USCI_A_UART_CLOCKSOURCE_SMCLK;
    param.clockPrescalar = 109;
    param.firstModReg = 0;
    param.secondModReg = 2;
    param.parity = USCI_A_UART_NO_PARITY;
    param.msborLsbFirst = USCI_A_UART_LSB_FIRST;
    param.numberofStopBits = USCI_A_UART_ONE_STOP_BIT;
    param.uartMode = USCI_A_UART_MODE;
    param.overSampling = USCI_A_UART_LOW_FREQUENCY_BAUDRATE_GENERATION;

    if(STATUS_FAIL == USCI_A_UART_init(USCI_A2_BASE, &param))
    {
        return;
    }

    //Enable UART module for operation
    USCI_A_UART_enable(USCI_A2_BASE);

    //Enable Receive Interrupt
    USCI_A_UART_clearInterrupt(USCI_A2_BASE,
                               USCI_A_UART_RECEIVE_INTERRUPT);
    USCI_A_UART_enableInterrupt(USCI_A2_BASE,
                                USCI_A_UART_RECEIVE_INTERRUPT);
    
    
    //Start timer in continuous mode sourced by SMCLK
    Timer_A_initContinuousModeParam initContParam = {0};
    initContParam.clockSource = TIMER_A_CLOCKSOURCE_SMCLK;
    initContParam.clockSourceDivider = TIMER_A_CLOCKSOURCE_DIVIDER_1;
    initContParam.timerInterruptEnable_TAIE = TIMER_A_TAIE_INTERRUPT_ENABLE;
    initContParam.timerClear = TIMER_A_DO_CLEAR;
    initContParam.startTimer = false;
    Timer_A_initContinuousMode(TIMER_A1_BASE, &initContParam);

    //Initiaze compare mode
    Timer_A_clearCaptureCompareInterrupt(TIMER_A1_BASE,
                                         TIMER_A_CAPTURECOMPARE_REGISTER_0
                                         );

    Timer_A_initCompareModeParam initCompParam = {0};
    initCompParam.compareRegister = TIMER_A_CAPTURECOMPARE_REGISTER_0;
    initCompParam.compareInterruptEnable =
        TIMER_A_CAPTURECOMPARE_INTERRUPT_DISABLE;
    initCompParam.compareOutputMode = TIMER_A_OUTPUTMODE_OUTBITVALUE;
    initCompParam.compareValue = 5000;
    Timer_A_initCompareMode(TIMER_A1_BASE, &initCompParam);

    Timer_A_startCounter(TIMER_A1_BASE,
                         TIMER_A_CONTINUOUS_MODE
                         );
  __bis_SR_register(GIE);
    //__enable_interrupt();

    while(1)
    {
//      if(timer_count > timeout)
//      { 
//        if(state == 1)
//        {
//          state = 0;
//          
//          uint8_t num = RingBuf_getCount(handle);
//          for(uint8_t i = 0; i<num;i++)
//          {
//            RingBuf_get(handle, &txbuf[i]);
//            USCI_A_UART_transmitData(USCI_A2_BASE,txbuf[i]);
//          }
//          
//        } 
//        else
//        {
//          timer_count = 0; 
//        }
//      }
       USCI_A_UART_transmitData(USCI_A2_BASE,timer_count);
    }
}

//******************************************************************************
//
//This is the USCI_A0 interrupt vector service routine.
//
//******************************************************************************
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A2_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(USCI_A2_VECTOR)))
#endif
void USCI_A0_ISR(void)
{
    switch(__even_in_range(UCA2IV,4))
    {
    //Vector 2 - RXIFG
    case 2:
        receivedData = USCI_A_UART_receiveData(USCI_A2_BASE);
        RingBuf_put(handle, receivedData);
        timer_count = 0;
        state = 1;
        break;
    default: break;
    }
}


//******************************************************************************
//
//This is the TIMER1_A3 interrupt vector service routine.
//
//******************************************************************************
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=TIMER1_A0_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(TIMER1_A0_VECTOR)))
#endif
void TIMER1_A0_ISR(void)
{
  switch(__even_in_range(TA0IV,0x0E))
    {
    //Vector 2 - RXIFG
    case 0x0E:
      timer_count ++; //²»¶Ï¼ÆÊý
    default: break;
    }
}