cli_uart.c

/*
 * cli_uart.c - msp430f5529 launchpad application uart interface implementation
 *
 * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
 *
 *
 *  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; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *  THEORY OF LIABILITY, 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.
 *
*/


//*****************************************************************************
//
//! \addtogroup CLI_UART
//! @{
//
//*****************************************************************************

#include "cli_uart.h"
#include <string.h>
#include <msp432.h>
#include "driverlib.h"

#define UCA0_OS   1    /* 1 = oversampling mode, 0 = low-freq mode */
#define UCA0_BR0  17   /* Value of UCA1BR0 register */
#define UCA0_BR1  0    /* Value of UCA1BR1 register */
#define UCA0_BRS  0    /* Value of UCBRS field in UCA1MCTL register */
#define UCA0_BRF  6    /* Value of UCBRF field in UCA1MCTL register */

#define ASCII_ENTER     0x0D

#ifdef _USE_CLI_
unsigned char *g_ucUARTBuffer;

int cli_have_cmd = 0;
#endif

/*!
    \brief          Application Uart interrupt handler

    \param[in]      none

    \return         none

    \note

    \warning
*/
//#pragma vector=USCI_A1_VECTOR
//__interrupt
void EUSCIA0_IRQHandler(void)
{
	if (UCA0IFG & UCRXIFG)
	{
#ifdef _USE_CLI_
			UCA0IFG &= ~UCRXIFG;
            *g_ucUARTBuffer = UCA1RXBUF;
            if (*g_ucUARTBuffer == ASCII_ENTER)
            {
                cli_have_cmd = 1;
                *g_ucUARTBuffer = 0x00;
                Interrupt_disableSleepOnIsrExit();

                // __bic_SR_register_on_exit(LPM0_bits);
            }
            g_ucUARTBuffer++;
#endif
            __no_operation();
	}
}

int
CLI_Read(unsigned char *pBuff)
{
    if(pBuff == NULL)
        return -1;
#ifdef _USE_CLI_
    cli_have_cmd = 0;
    g_ucUARTBuffer = pBuff;
    UCA0IE |= UCRXIE;

    Interrupt_enableMaster();
    Interrupt_enableInterrupt(INT_EUSCIA0);
    PCM_gotoLPM0();

    // __bis_SR_register(LPM0_bits + GIE);

    while(cli_have_cmd == 0);
    UCA0IE &= ~UCRXIE;

    return strlen((const char *)pBuff);
#else
    return 0;
#endif
}


int
CLI_Write(unsigned char *inBuff)
{
    if(inBuff == NULL)
        return -1;
#ifdef _USE_CLI_
    unsigned short ret,usLength = strlen((const char *)inBuff);
    ret = usLength;
    while (usLength)
    {
        while (!(UCA0IFG & UCTXIFG)) ;
        UCA0TXBUF = *inBuff;
        usLength--;
        inBuff++;
    }
    return (int)ret;
#else
    return 0;
#endif
}

#define UCBRF_0                (0x00)         /* USCI First Stage Modulation: 0 */
#define UCBRS_3                (0x0600)         /* USCI First Stage Modulation: 3 */
void
CLI_Configure(void)
{
#ifdef _USE_CLI_
    P1SEL0 |= BIT2 | BIT3;               /* MSP430F5529 = P4.4,5 = USCI_A0 TXD/RXD */
    P1SEL1 &= ~(BIT2 | BIT3);            /* MSP432P401R = P1.2,3 = USCI_A0 TXD/RXD */

    //!TODO: investigate MSP430 code, might not work on MSP432
//    UCA0CTL1 |= UCSWRST;                /* Put state machine in reset */
//    UCA0CTL0 = 0x00;
//    UCA0CTL1 = UCSSEL__SMCLK + UCSWRST; /* Use SMCLK, keep RESET */

    UCA0CTLW0 = UCSSEL__SMCLK + UCSWRST; /* Use SMCLK, keep RESET */

//    UCA0BR0 = 0x2C;           /* 25MHz/115200= 217.01 =0xD9 (see User's Guide) */
//    UCA0BR1 = 0x0A;           /* 25MHz/9600= 2604 =0xA2C (see User's Guide) */
    UCA0BR0 = 139;			  /* 48MHz/9600 = 5000 */
    UCA0BR1 = 19;			  /* 48MHz/9600 = 5000 */

    //!TODO: double-check this, moving from F5529 to eUSCI, 8-bit to 16-bit, things might have oddly changed.
    UCA0MCTLW = UCBRS_3 + UCBRF_0;       /* Modulation UCBRSx=3, UCBRFx=0 */

    UCA0CTLW0 &= ~UCSWRST;               /* Initialize USCI state machine */

    /* Disable RX Interrupt on UART */
    UCA0IFG &= ~ (UCRXIFG | UCRXIFG);
    UCA0IE &= ~UCRXIE;
#endif
}


//*****************************************************************************
//
// Close the Doxygen group.
//! @}
//
//*****************************************************************************