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//******************************************************************************
//!  EUSCI_A1 External Loopback test using EUSCI_A_UART_init API
//!
//!  Description: This demo connects TX to RX of the MSP430 UART
//!  The example code shows proper initialization of registers
//!  and interrupts to receive and transmit data.
//!
//!  ACLK = BRCLK = 32.768kHz, MCLK = SMCLK = DCO = ~1MHz
//!
//!
//!      Tested on MSP430FR5969
//!             -----------------
//!       RST -|     P2.0/UCA1TXD|----|
//!            |                 |    |
//!            |                 |    |
//!            |     P2.1/UCA1RXD|----|
//!            |                 |
//!
//! 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)
//! - UCA1TXD
//! - UCA1RXD
//!
//! 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_A1_VECTOR.
//******************************************************************************
#include "driverlib.h"

uint16_t i;
uint8_t RXData = 0, TXData = 0;
uint8_t check = 0;

void main(void)
{
    // stop watchdog
    WDT_A_hold(WDT_A_BASE);

    // LFXT Setup
    //Set PJ.4 and PJ.5 as Primary Module Function Input.
    /*

    * Select Port J
    * Set Pin 4, 5 to input Primary Module Function, LFXT.
    */
    GPIO_setAsPeripheralModuleFunctionInputPin(
        GPIO_PORT_PJ,
        GPIO_PIN4 + GPIO_PIN5,
        GPIO_PRIMARY_MODULE_FUNCTION
    );


    // Set PJ.6 and PJ.7 as Primary Module Function Input, HFXT.
    GPIO_setAsPeripheralModuleFunctionInputPin(
           GPIO_PORT_PJ,
           GPIO_PIN6 + GPIO_PIN7,
           GPIO_PRIMARY_MODULE_FUNCTION
           );

    // Check if one FRAM waitstate is needed for 5962, 5994 device as well!
    FRAMCtl_A_configureWaitStateControl(FRAMCTL_A_ACCESS_TIME_CYCLES_1);

    uint32_t u32ClockFrequencyCheck = 0u;
    // Set DCO frequency to 8 MHz
#ifdef DCO_CLK_SOURCES_MCLK
    CS_setDCOFreq(CS_DCORSEL_0, CS_DCOFSEL_6);
    //Set external clock frequency to 32.768 KHz

    CS_setExternalClockSource(32768, 0);
    CS_initClockSignal(CS_SMCLK, CS_DCOCLK_SELECT, CS_CLOCK_DIVIDER_1);
    CS_initClockSignal(CS_MCLK, CS_DCOCLK_SELECT, CS_CLOCK_DIVIDER_1);
#else

    // JA - Enable lxft & HXFT
    CS_setExternalClockSource(32768, 16000000);

    CS_initClockSignal(CS_SMCLK, CS_HFXTCLK_SELECT, CS_CLOCK_DIVIDER_1);
    CS_initClockSignal(CS_MCLK, CS_HFXTCLK_SELECT, CS_CLOCK_DIVIDER_1);
#endif //DCO_CLK_SOURCES_MCLK
    //Set ACLK=LFXT
    CS_initClockSignal(CS_ACLK, CS_LFXTCLK_SELECT, CS_CLOCK_DIVIDER_1);


    //Set the appropriate drive values for each oscillator for the launchpad vs. actual schematic.
//    CS_turnOnLFXT(CS_LFXT_DRIVE_3);
      CS_turnOnLFXT(CS_LFXT_DRIVE_0);

    // JA
#ifndef DCO_CLK_SOURCES_MCLK
    CS_turnOnHFXT(CS_HFXT_DRIVE_16MHZ_24MHZ);
// JA - SMCLK appears to be running extremely slowly when sourced from HFXT

#endif
      // JA - Check SMCLK, MCLK clock frequencies
      u32ClockFrequencyCheck = CS_getMCLK();
      u32ClockFrequencyCheck = CS_getSMCLK();



    // Configure UART pins
    //Set P2.0 and P2.1 as Secondary Module Function Input.
    /*

    * Select Port 2d
    * Set Pin 0, 1 to input Secondary Module Function, (UCA1TXD/UCA1SIMO, UCA1RXD/UCA1SOMI).
    */
    GPIO_setAsPeripheralModuleFunctionInputPin(
    GPIO_PORT_P2,
    GPIO_PIN5 + GPIO_PIN6,
    GPIO_SECONDARY_MODULE_FUNCTION
    );

    /*
     * Disable the GPIO power-on default high-impedance mode to activate
     * previously configured port settings
     */
    PMM_unlockLPM5();

    // Configure UART
    EUSCI_A_UART_initParam param = {0};
    param.selectClockSource = EUSCI_A_UART_CLOCKSOURCE_SMCLK;
    param.clockPrescalar = 16;
    param.firstModReg = 0;
    param.secondModReg = 0;
    param.parity = EUSCI_A_UART_NO_PARITY;
    param.msborLsbFirst = EUSCI_A_UART_LSB_FIRST;
    param.numberofStopBits = EUSCI_A_UART_ONE_STOP_BIT;
    param.uartMode = EUSCI_A_UART_MODE;
    param.overSampling = EUSCI_A_UART_LOW_FREQUENCY_BAUDRATE_GENERATION;
    
    if (STATUS_FAIL == EUSCI_A_UART_init(EUSCI_A1_BASE, &param)) {
        return;
    }

    EUSCI_A_UART_enable(EUSCI_A1_BASE);

    EUSCI_A_UART_clearInterrupt(EUSCI_A1_BASE,
      EUSCI_A_UART_RECEIVE_INTERRUPT);

    // Enable USCI_A1 RX interrupt
    EUSCI_A_UART_enableInterrupt(EUSCI_A1_BASE,
      EUSCI_A_UART_RECEIVE_INTERRUPT);                     // Enable interrupt

    __enable_interrupt();
    while (1)
    {
        TXData = TXData+1;                      // Increment TX data
        // Load data onto buffer
        EUSCI_A_UART_transmitData(EUSCI_A1_BASE,
        				   TXData);
        while(check != 1);
        check = 0;
    }
}
//******************************************************************************
//
//This is the USCI_A1 interrupt vector service routine.
//
//******************************************************************************
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A1_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(USCI_A1_VECTOR)))
#endif
void USCI_A1_ISR(void)
{
  switch(__even_in_range(UCA1IV,USCI_UART_UCTXCPTIFG))
  {
    case USCI_NONE: break;
    case USCI_UART_UCRXIFG:
      RXData = EUSCI_A_UART_receiveData(EUSCI_A1_BASE);
      if(!(RXData == TXData))                   // Check value
      {
        while(1);
      }
      check =1;
      break;
    case USCI_UART_UCTXIFG: break;
    case USCI_UART_UCSTTIFG: break;
    case USCI_UART_UCTXCPTIFG: break;
  }
}