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218 lines
6.4 KiB
218 lines
6.4 KiB
/* --COPYRIGHT--,BSD
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* Copyright (c) 2013, Texas Instruments Incorporated
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of Texas Instruments Incorporated nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* --/COPYRIGHT--*/
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//*****************************************************************************
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//
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//! TouchProGUI.c
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//
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//! TouchProGUI enables interrupt-driven UART communication
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//! to the Touch Pro GUI platform tool. The protocol is defined in
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//! SLAU486 (The TouchPro GUI User's Guide).
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//! The baud rate is fixed at 9600B.
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//
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//! Resources: UCA0 in UART Mode, USCIAB0TX_VECTOR
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//! - UCA0 BR and MOD settings need to be placed in the header file for the
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//! to provide 9600B with a given input clock.
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//
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//! \author Texas Instruments
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//! \author MSP430 Strategic Applications
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//
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//! \version 1.0 - W. Schnoor, 1/7/14: Initial Release
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//
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//*****************************************************************************
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#include "TouchProGUI.h"
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uint8_t g_ui8TouchProGUITXBuffer[TOUCHPROGUI_BUFFER_LENGTH] = { TOUCHPROGUI_SYNC_UPPER, TOUCHPROGUI_SYNC_LOWER };
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uint8_t g_ui8TouchProGUITXLength = 0;
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//*****************************************************************************
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//
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//! TouchProGUI_init()
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//! This API will configure the USCI UCA0 in UART mode based upon the
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//! definitions UART_BR_LOWER, UART_BR_UPPER, and UART_MOD.
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//
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//! /param none.
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//! /return none.
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//
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//*****************************************************************************
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void TouchProGUI_init(void)
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{
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//
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// Configure Pin for UART Transmit Functionality
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//
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P1SEL |= BIT2;
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P1SEL2 |= BIT2;
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//
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// Configure USCIA0 UART based upon header file definitions
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//
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UCA0CTL1 |= UCSSEL_2;
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UCA0BR0 = UART_BR_LOWER;
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UCA0BR1 = UART_BR_UPPER;
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UCA0MCTL = UART_MOD;
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//
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// Release State Machine Reset
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//
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UCA0CTL1 &= ~UCSWRST;
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}
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//*****************************************************************************
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//
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//! TouchProGUI_sendData(uint16_t *ui16DataBuffer, uint8_t ui8Length)
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//! This API will send a set of data to TouchPro GUI.
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//
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//! /param ui16DataBuffer is a pointer to the data array to send.
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//! /param ui8Length specifies how many words in the ui16DataBuffer array
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//! that there are to be sent.
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//! /return none.
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//
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//*****************************************************************************
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void TouchProGUI_sendData(uint16_t *ui16DataBuffer, uint8_t ui8Length)
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{
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uint8_t *pTxBuffer;
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uint8_t ui8CurrentChannel;
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uint8_t ui8Checksum;
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//
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// Check to make sure the user is not trying to send more channels
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// than the buffer or TouchPro GUI supprt
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//
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if (ui8Length > TOUCHPROGUI_MAX_CHANNELS)
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{
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ui8Length = TOUCHPROGUI_MAX_CHANNELS;
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}
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//
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// Start buffer pointer at position 2 (since positions 0 and 1
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// are utilized for the sync word and are not to be altered).
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// NOTE: The check sum includes sync word.
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//
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pTxBuffer = &g_ui8TouchProGUITXBuffer[2];
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ui8Checksum = TOUCHPROGUI_SYNC_UPPER + TOUCHPROGUI_SYNC_LOWER;
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//
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// Calculate packet length (without sync word) in bytes
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// = (Length * 3) + 1
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//
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g_ui8TouchProGUITXLength = ui8Length * 3 + 1;
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*(pTxBuffer++) = g_ui8TouchProGUITXLength;
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ui8Checksum += g_ui8TouchProGUITXLength;
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//
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// Fill buffer with each channel's data
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//
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for (ui8CurrentChannel = 0; ui8CurrentChannel < ui8Length; ui8CurrentChannel++)
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{
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//
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// Channel Number
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//
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*pTxBuffer = (uint8_t)ui8CurrentChannel;
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ui8Checksum += *(pTxBuffer++);
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//
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// Channel Data Upper Byte
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//
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*pTxBuffer = (uint8_t)(ui16DataBuffer[ui8CurrentChannel] >> 8);
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ui8Checksum += *(pTxBuffer++);
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//
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// Channel Data Lower Byte
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//
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*pTxBuffer = (uint8_t)ui16DataBuffer[ui8CurrentChannel];
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ui8Checksum += *(pTxBuffer++);
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}
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//
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// Add checksum to buffer
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//
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*pTxBuffer = ui8Checksum;
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//
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// Increase packet length by three to include the sync word (0x55AA)
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// and length byte
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//
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g_ui8TouchProGUITXLength += 3;
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//
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// Start USCI_A0 transmit interrupt to
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// send the data via the USCI_A0 peripheral
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//
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IE2 |= UCA0TXIE;
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//
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// Go to LPM0 for completion of byte transmission
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//
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LPM0;
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//
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// If revived from LPMx, ensure packet got sent
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// before continuing
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//
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if (g_ui8TouchProGUITXLength != 0)
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{
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LPM0;
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}
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else
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{
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return;
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}
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}
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//*****************************************************************************
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//
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//! USCIAB0TX_VECTOR
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//
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//*****************************************************************************
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#pragma vector=USCIAB0TX_VECTOR
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__interrupt void USCI_ISR(void)
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{
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static uint8_t g_ui8CurrentByteIndex = 0;
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//
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// Send the next byte in the transmit buffer
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//
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UCA0TXBUF = g_ui8TouchProGUITXBuffer[g_ui8CurrentByteIndex++];
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//
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// If sending the last byte, clear interrupt enable, reset byte
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// counters, and wake back to application from LPMx.
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//
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if (g_ui8CurrentByteIndex == g_ui8TouchProGUITXLength)
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{
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g_ui8CurrentByteIndex = 0;
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g_ui8TouchProGUITXLength = 0;
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IE2 &= ~UCA0TXIE;
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LPM3_EXIT;
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}
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}
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