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//#############################################################################
//
// FILE: sci_ex3_echoback.c
//
// TITLE: SCI echoback example.
//
//! \addtogroup driver_example_list
//! <h1>SCI Echoback</h1>
//!
//! This test receives and echo-backs data through the SCI-A port.
//!
//! A terminal such as 'putty' can be used to view the data from
//! the SCI and to send information to the SCI. Characters received
//! by the SCI port are sent back to the host.
//!
//! \b Running \b the \b Application
//! Open a COM port with the following settings using a terminal:
//! - Find correct COM port
//! - Bits per second = 9600
//! - Data Bits = 8
//! - Parity = None
//! - Stop Bits = 1
//! - Hardware Control = None
//!
//! The program will print out a greeting and then ask you to
//! enter a character which it will echo back to the terminal.
//!
//! \b Watch \b Variables \n
//! - loopCounter - the number of characters sent
//!
//! \b External \b Connections \n
//! Connect the SCI-A port to a PC via a USB cable.
//! Refer to the hardware user guide for the UART/USB connector information.
//
//#############################################################################
//
//
// $Copyright:
// Copyright (C) 2013-2023 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.
// $
//#############################################################################
//
// Included Files
//
#include "driverlib.h"
#include "device.h"
//
// Defines
//
// Define AUTOBAUD to use the autobaud lock feature
//#define AUTOBAUD
//
// Globals
//
uint16_t loopCounter = 0;
//
// Main
//
void main(void)
{
uint16_t receivedChar;
unsigned char *msg;
uint16_t rxStatus = 0U;
//
// Configure PLL, disable WD, enable peripheral clocks.
//
Device_init();
//
// Disable pin locks and enable internal pullups.
//
Device_initGPIO();
//
// Configuration for the SCI Rx pin.
//
GPIO_setMasterCore(DEVICE_GPIO_PIN_SCIRXDA, GPIO_CORE_CPU1);
GPIO_setPinConfig(DEVICE_GPIO_CFG_SCIRXDA);
GPIO_setDirectionMode(DEVICE_GPIO_PIN_SCIRXDA, GPIO_DIR_MODE_IN);
GPIO_setPadConfig(DEVICE_GPIO_PIN_SCIRXDA, GPIO_PIN_TYPE_STD);
GPIO_setQualificationMode(DEVICE_GPIO_PIN_SCIRXDA, GPIO_QUAL_ASYNC);
//
// Configuration for the SCI Tx pin.
//
GPIO_setMasterCore(DEVICE_GPIO_PIN_SCITXDA, GPIO_CORE_CPU1);
GPIO_setPinConfig(DEVICE_GPIO_CFG_SCITXDA);
GPIO_setDirectionMode(DEVICE_GPIO_PIN_SCITXDA, GPIO_DIR_MODE_OUT);
GPIO_setPadConfig(DEVICE_GPIO_PIN_SCITXDA, GPIO_PIN_TYPE_STD);
GPIO_setQualificationMode(DEVICE_GPIO_PIN_SCITXDA, GPIO_QUAL_ASYNC);
//
// Initialize interrupt controller and vector table.
//
Interrupt_initModule();
Interrupt_initVectorTable();
//
// Initialize SCIA and its FIFO.
//
SCI_performSoftwareReset(SCIA_BASE);
//
// Configure SCIA for echoback.
//
SCI_setConfig(SCIA_BASE, DEVICE_LSPCLK_FREQ, 9600, (SCI_CONFIG_WLEN_8 |
SCI_CONFIG_STOP_ONE |
SCI_CONFIG_PAR_NONE));
SCI_resetChannels(SCIA_BASE);
SCI_resetRxFIFO(SCIA_BASE);
SCI_resetTxFIFO(SCIA_BASE);
SCI_clearInterruptStatus(SCIA_BASE, SCI_INT_TXFF | SCI_INT_RXFF);
SCI_enableFIFO(SCIA_BASE);
SCI_enableModule(SCIA_BASE);
SCI_performSoftwareReset(SCIA_BASE);
#ifdef AUTOBAUD
//
// Perform an autobaud lock.
// SCI expects an 'a' or 'A' to lock the baud rate.
//
SCI_lockAutobaud(SCIA_BASE);
#endif
//
// Send starting message.
//
msg = "\r\n\n\nHello World!\0";
SCI_writeCharArray(SCIA_BASE, (uint16_t*)msg, 17);
msg = "\r\nYou will enter a character, and the DSP will echo it back!\n\0";
SCI_writeCharArray(SCIA_BASE, (uint16_t*)msg, 62);
for(;;)
{
msg = "\r\nEnter a character: \0";
SCI_writeCharArray(SCIA_BASE, (uint16_t*)msg, 22);
//
// Read a character from the FIFO.
//
receivedChar = SCI_readCharBlockingFIFO(SCIA_BASE);
rxStatus = SCI_getRxStatus(SCIA_BASE);
if((rxStatus & SCI_RXSTATUS_ERROR) != 0)
{
//
//If Execution stops here there is some error
//Analyze SCI_getRxStatus() API return value
//
ESTOP0;
}
//
// Echo back the character.
//
msg = " You sent: \0";
SCI_writeCharArray(SCIA_BASE, (uint16_t*)msg, 13);
SCI_writeCharBlockingFIFO(SCIA_BASE, receivedChar);
//
// Increment the loop count variable.
//
loopCounter++;
}
}
//
// End of File
//