463 lines
20 KiB
C
463 lines
20 KiB
C
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//*****************************************************************************
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// MSP430FG439-Heart Rate Monitor Demo
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//
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// Description; Uses one Instrumentation Amplifier INA321 and the three
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// internal opamps of the MSP430FG439
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//
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// Murugavel Raju
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// Texas Instruments, Inc
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// October 2004
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// Edited by: M Morales, November 2008
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// * Updated to non-depracated intrinsic functions
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// * Changed spacing for legibility
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// Edited by:
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// Penko T. Bozhkov - Olimex LTD, 05.10.2012
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// * RTC capcitors changed according to Olimex's crystall requirements
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// * Olimex LCD definitions are added and heart rate is visualized at 2 places on LCD
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// Built with IAR Embedded Workbench Version: 4.21
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//*****************************************************************************
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//*****************************************************************************
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// THIS PROGRAM IS PROVIDED "AS IS". TI MAKES NO WARRANTIES OR
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// REPRESENTATIONS, EITHER EXPRESS, IMPLIED OR STATUTORY,
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// INCLUDING ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE, LACK OF VIRUSES, ACCURACY OR
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// COMPLETENESS OF RESPONSES, RESULTS AND LACK OF NEGLIGENCE.
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// TI DISCLAIMS ANY WARRANTY OF TITLE, QUIET ENJOYMENT, QUIET
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// POSSESSION, AND NON-INFRINGEMENT OF ANY THIRD PARTY
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// INTELLECTUAL PROPERTY RIGHTS WITH REGARD TO THE PROGRAM OR
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// YOUR USE OF THE PROGRAM.
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//
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// IN NO EVENT SHALL TI BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
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// CONSEQUENTIAL OR INDIRECT DAMAGES, HOWEVER CAUSED, ON ANY
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// THEORY OF LIABILITY AND WHETHER OR NOT TI HAS BEEN ADVISED
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// OF THE POSSIBILITY OF SUCH DAMAGES, ARISING IN ANY WAY OUT
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// OF THIS AGREEMENT, THE PROGRAM, OR YOUR USE OF THE PROGRAM.
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// EXCLUDED DAMAGES INCLUDE, BUT ARE NOT LIMITED TO, COST OF
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// REMOVAL OR REINSTALLATION, COMPUTER TIME, LABOR COSTS, LOSS
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// OF GOODWILL, LOSS OF PROFITS, LOSS OF SAVINGS, OR LOSS OF
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// USE OR INTERRUPTION OF BUSINESS. IN NO EVENT WILL TI'S
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// AGGREGATE LIABILITY UNDER THIS AGREEMENT OR ARISING OUT OF
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// YOUR USE OF THE PROGRAM EXCEED FIVE HUNDRED DOLLARS
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// (U.S.$500).
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//
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// Unless otherwise stated, the Program written and copyrighted
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// by Texas Instruments is distributed as "freeware". You may,
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// only under TI's copyright in the Program, use and modify the
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// Program without any charge or restriction. You may
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// distribute to third parties, provided that you transfer a
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// copy of this license to the third party and the third party
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// agrees to these terms by its first use of the Program. You
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// must reproduce the copyright notice and any other legend of
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// ownership on each copy or partial copy, of the Program.
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//
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// You acknowledge and agree that the Program contains
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// copyrighted material, trade secrets and other TI proprietary
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// information and is protected by copyright laws,
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// international copyright treaties, and trade secret laws, as
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// well as other intellectual property laws. To protect TI's
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// rights in the Program, you agree not to decompile, reverse
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// engineer, disassemble or otherwise translate any object code
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// versions of the Program to a human-readable form. You agree
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// that in no event will you alter, remove or destroy any
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// copyright notice included in the Program. TI reserves all
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// rights not specifically granted under this license. Except
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// as specifically provided herein, nothing in this agreement
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// shall be construed as conferring by implication, estoppel,
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// or otherwise, upon you, any license or other right under any
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// TI patents, copyrights or trade secrets.
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//
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// You may not use the Program in non-TI devices.
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//*****************************************************************************
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#include "msp430fg439.h"
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#include "math.h"
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//defines
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#define PB_2_0 (1 << 0) // Push Button on P2.0
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#define PB_2_1 (1 << 1) // Push Button on P2.1
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// variables declaration
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static char beats;
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int i=0, first_detection=0;
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long result = 0;
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int Datain, Dataout, Dataout_pulse, pulseperiod, counter, heartrate;
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int heartrate_buffer[] = {0,0,0,0,0,0,0,0,0,0};
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int heartrate_cursor = 0, heartrate_mean;
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// Lowpass FIR filter coefficients for 17 taps to filter > 30Hz
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static const int coeffslp[9] = {
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5225, 5175, 7255, 9453, 11595, 13507, 15016, 15983, 16315 };
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// Highpass FIR filter coefficients for 17 taps to filter < 2Hz
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static const int coeffshp[9] = {
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-763, -1267, -1091, -1867, -1969, -2507, -2619, -2911, 29908 };
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// *******************************************
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// Definitions related to Olimex LCD Digits!!!!
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// *******************************************
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// Definitions for Olimex LCD digits 10 and 11
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#define a 0x10
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#define b 0x01
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#define c 0x04
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#define d 0x08
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#define e 0x40
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#define f 0x20
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#define g 0x02
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#define h 0x80
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// Character generator definition for display digits 10 and 11
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const char char_gen_10_11[] = {
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a+b+c+d+e+f, // 0 Displays "0"
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b+c, // 1 Displays "1"
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a+b+d+e+g, // 2 Displays "2"
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a+b+c+d+g, // 3 Displays "3"
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b+c+f+g, // 4 Displays "4"
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a+c+d+f+g, // 5 Displays "5"
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a+c+d+e+f+g, // 6 Displays "6"
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a+b+c, // 7 Displays "7"
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a+b+c+d+e+f+g, // 8 Displays "8"
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a+b+c+d+f+g, // 9 Displays "9"
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};
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// undefines
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#undef a
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#undef b
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#undef c
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#undef d
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#undef e
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#undef f
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#undef g
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#undef h
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// Definitions for Olimex LCD digits 8 and 9
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#define a 0x01
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#define b 0x02
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#define c 0x04
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#define d 0x80
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#define e 0x40
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#define f 0x10
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#define g 0x20
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#define h 0x08
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// Character generator definition for display digits 8 and 9
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const char char_gen_8_9[] = {
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a+b+c+d+e+f, // 0 Displays "0"
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b+c, // 1 Displays "1"
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a+b+d+e+g, // 2 Displays "2"
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a+b+c+d+g, // 3 Displays "3"
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b+c+f+g, // 4 Displays "4"
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a+c+d+f+g, // 5 Displays "5"
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a+c+d+e+f+g, // 6 Displays "6"
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a+b+c, // 7 Displays "7"
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a+b+c+d+e+f+g, // 8 Displays "8"
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a+b+c+d+f+g, // 9 Displays "9"
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};
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// undefines
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#undef a
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#undef b
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#undef c
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#undef d
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#undef e
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#undef f
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#undef g
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#undef h
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// Definitions for Olimex LCD digits 1 to 7. Here each digit definition require 2 bytes
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#define a 0x0080
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#define b 0x0040
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#define c 0x0020
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#define d 0x0010
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#define e 0x2000
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#define f 0x4000
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#define g 0x0402
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#define h 0x1000
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// Character generator definition for display digits 1 to 7
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const int char_gen_1_7[] = {
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a+b+c+d+e+f, // 0 Displays "0"
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b+c, // 1 Displays "1"
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a+b+d+e+g, // 2 Displays "2"
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a+b+c+d+g, // 3 Displays "3"
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b+c+f+g, // 4 Displays "4"
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a+c+d+f+g, // 5 Displays "5"
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a+c+d+e+f+g, // 6 Displays "6"
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a+b+c, // 7 Displays "7"
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a+b+c+d+e+f+g, // 8 Displays "8"
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a+b+c+d+f+g, // 9 Displays "9"
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};
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// undefines
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#undef a
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#undef b
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#undef c
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#undef d
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#undef e
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#undef f
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#undef g
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#undef h
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// function prototypes
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void Init(void); // Initializes device for the application
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void ClearLCD(void); // Clears the LCD memory
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int filterlp(int); // 17 tap lowpass FIR filter
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int filterhp(int); // 17 tap highpass FIR filter
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long mul16(register int x, register int y); // 16-bit signed multiplication
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int itobcd(int i); // 16-bit hex to bcd conversion
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// main function
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int main(void)
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{
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Init(); // Initialize device for the application
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LCDMEM[7] = 0x80; // Turn on LCD's Olimex row!!!
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/*
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// For debug purpose only!
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for(unsigned char j=0;j<10;j++){
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LCDMEM[2] = char_gen_10_11[j]; // LCD -> Digit 11
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LCDMEM[3] = char_gen_10_11[j]; // LCD -> Digit 10
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LCDMEM[4] = char_gen_8_9[j]; // LCD -> Digit 9
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LCDMEM[5] = char_gen_8_9[j]; // LCD -> Digit 8
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LCDMEM[7] = ((char)(char_gen_1_7[j]>>8)); // LCD -> Digit 7 High Byte
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LCDMEM[6] = ((char)(char_gen_1_7[j]&0x00FF)); // LCD -> Digit 7 Low Byte
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LCDMEM[9] = ((char)(char_gen_1_7[j]>>8)); // LCD -> Digit 6 High Byte
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LCDMEM[8] = ((char)(char_gen_1_7[j]&0x00FF)); // LCD -> Digit 6 Low Byte
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LCDMEM[11] = ((char)(char_gen_1_7[j]>>8)); // LCD -> Digit 5 High Byte
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LCDMEM[10] = ((char)(char_gen_1_7[j]&0x00FF)); // LCD -> Digit 5 Low Byte
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//LCDMEM[13] = ((char)(char_gen_1_7[j]>>8)); // LCD -> Digit 4 High Byte
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//LCDMEM[12] = ((char)(char_gen_1_7[j]&0x00FF)); // LCD -> Digit 4 Low Byte
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//LCDMEM[15] = ((char)(char_gen_1_7[j]>>8)); // LCD -> Digit 3 High Byte
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//LCDMEM[14] = ((char)(char_gen_1_7[j]&0x00FF)); // LCD -> Digit 3 Low Byte
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//LCDMEM[17] = ((char)(char_gen_1_7[j]>>8)); // LCD -> Digit 2 High Byte
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//LCDMEM[16] = ((char)(char_gen_1_7[j]&0x00FF)); // LCD -> Digit 2 Low Byte
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}
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*/
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while(1)
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{
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__bis_SR_register(LPM0_bits); // Enter LPM0 needed for UART TX completion
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__no_operation();
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Dataout = filterlp(Datain); // Lowpass FIR filter for filtering out 60Hz
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Dataout_pulse = filterhp(Dataout)-128; // Highpass FIR filter to filter muscle artifacts
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Dataout = Dataout >> 6; // Scale Dataout to use scope program
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if(Dataout > 255) Dataout = 255; // Set boundary 255 max
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if(Dataout < 0) Dataout = 0; // Set boundary 0 min
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//DAC12_0DAT = Dataout; // For scope display
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if( 0 ) {
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TXBUF0 = Dataout; // Transmit via UART0 for Scope display
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} else {
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// send the data as ascii values
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TXBUF0 = (Dataout / 100) + 48; // hundreds
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while (!(IFG1 & UTXIFG0)); // wait for transmission
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TXBUF0 = ((Dataout / 10) % 10 ) + 48; // tens
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while (!(IFG1 & UTXIFG0));
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TXBUF0 = ((Dataout / 1) % 10 ) + 48; // ones
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while (!(IFG1 & UTXIFG0));
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TXBUF0 = 32; // send a blank
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while (!(IFG1 & UTXIFG0));
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TXBUF0 = ((heartrate & 0xf00) >> 8) + 48;
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while (!(IFG1 & UTXIFG0));
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TXBUF0 = ((heartrate & 0xf0) >> 4) + 48;
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while (!(IFG1 & UTXIFG0));
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TXBUF0 = (heartrate & 0x0f) + 48;
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while (!(IFG1 & UTXIFG0));
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TXBUF0 = 10; // send a \n
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}
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counter++; // Debounce counter
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pulseperiod++; // Pulse period counter
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if (Dataout_pulse > 100) // Check if above threshold (48)
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{
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LCDMEM[1] = 0xF0; // Heart beat detected enable "<^>" on LCD
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counter = 0; // Reset debounce counter
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}
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if (counter == 128) // Allow 128 sample debounce time
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{
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LCDMEM[1] = 0x00; // Disable "<^>" on LCD for blinking effect
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beats++;
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if (beats == 3)
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{
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beats = 0;
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//heartrate_buffer[heartrate_cursor] = 50720/pulseperiod;
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//heartrate_cursor++;
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//heartrate_cursor = heartrate_cursor % 10;
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//int ct;
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//for(ct = 0; ct < 10; ct++) {
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// heartrate_mean += heartrate_buffer[ct];
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//}
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//heartrate = itobcd(heartrate_mean / 10);
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// heartrate = itobcd(30720/pulseperiod); // Calculate beat to beat heart rate per min
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//heartrate = itobcd(92160/pulseperiod); // Calculate 3 beat average heart rate per min
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heartrate = itobcd(50720/pulseperiod); // Calculate 3 beat average heart rate per min
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//heartrate = (92160/pulseperiod); // Calculate 3 beat average heart rate per min
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pulseperiod = 0; // Reset pulse period for next measurement
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///*
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LCDMEM[2] = char_gen_10_11[heartrate & 0x0f]; // Display current heart rate units -> LCD Digit 11
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LCDMEM[3] = char_gen_10_11[(heartrate & 0xf0) >> 4]; // tens -> LCD Digit 10
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LCDMEM[4] = char_gen_8_9[(heartrate & 0xf00) >> 8]; // hundreds -> LCD Digit 9
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LCDMEM[7] = ((char)(char_gen_1_7[heartrate & 0x0f]>>8)); // LCD -> Digit 7 High Byte
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LCDMEM[6] = ((char)(char_gen_1_7[heartrate & 0x0f]&0x00FF)); // LCD -> Digit 7 Low Byte
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LCDMEM[9] = ((char)(char_gen_1_7[((heartrate & 0xf0) >> 4)]>>8)); // LCD -> Digit 6 High Byte
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LCDMEM[8] = ((char)(char_gen_1_7[((heartrate & 0xf0) >> 4)]&0x00FF)); // LCD -> Digit 6 Low Byte
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LCDMEM[11] = ((char)(char_gen_1_7[((heartrate & 0xf00) >> 8)]>>8)); // LCD -> Digit 5 High Byte
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LCDMEM[10] = ((char)(char_gen_1_7[((heartrate & 0xf00) >> 8)]&0x00FF)); // LCD -> Digit 5 Low Byte
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//*/
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}
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}
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}
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}//main
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// Initialization function
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void Init( void )
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{
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FLL_CTL0 |= XCAP10PF; // Set load capacitance for xtal
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WDTCTL = WDTPW | WDTHOLD; // Disable the Watchdog
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while ( LFOF & FLL_CTL0); // wait for watch crystal to stabilize
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SCFQCTL = 63; // 32 x 32768 x 2 = 2.097152MHz
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BTCTL = BT_fLCD_DIV128; // Set LCD frame freq = ACLK/128
|
||
|
|
// Initialize and enable LCD peripheral
|
||
|
|
ClearLCD(); // Clear LCD memory
|
||
|
|
LCDCTL = LCDSG0_3 + LCD4MUX + LCDON ; // 4mux LCD, segs0-23 enabled
|
||
|
|
// Initialize and enable GPIO ports
|
||
|
|
P1OUT = 0x00 + BIT3; // Clear P1OUT register, INA turned ON
|
||
|
|
P1DIR = 0x3f; // Unused pins as outputs, Comparator pins as inputs
|
||
|
|
P2OUT = 0x00; // Clear P2OUT register
|
||
|
|
P2DIR = 0xff; // Unused pins as outputs
|
||
|
|
P2DIR = ~(PB_2_0+PB_2_1); // P2.0 and P2.1 push buttons
|
||
|
|
P2IES = 0x00; // Interrupt edge low to high transition
|
||
|
|
P2IFG = 0x00; // Clear pending P2 interrupts
|
||
|
|
P2IE = PB_2_0 | PB_2_1; // Enable intterupts for push buttons
|
||
|
|
P3OUT = 0x00; // Clear P3OUT register
|
||
|
|
P3DIR = 0x0f; // Unused pins as outputs except P3.<4-7> -> For the new LCD's received at ~04.10.2012 this must be inputs!!
|
||
|
|
P4OUT = 0x00; // Clear P4OUT register
|
||
|
|
P4DIR = 0xff; // Unused pins as outputs
|
||
|
|
P5OUT = 0x00; // Clear P5OUT register
|
||
|
|
P5DIR = 0xff; // Unused pins as outputs
|
||
|
|
P5SEL = 0xfc; // Set Rxx and COM pins for LCD
|
||
|
|
P6OUT = 0x00; // Clear P6OUT register
|
||
|
|
P6SEL = 0xff; // P6 = Analog
|
||
|
|
// Initialize and enable UART
|
||
|
|
P2SEL|=BIT4; // P2.4 = TXD
|
||
|
|
UCTL0 |= SWRST; // UART SWRST = 1
|
||
|
|
ME1 |= UTXE0; // Enable UART0 TXD
|
||
|
|
UCTL0 |= CHAR; // 8-bit char, SWRST=1
|
||
|
|
UTCTL0 |= SSEL1; // UCLK = SMCLK
|
||
|
|
UBR00 = 18; // 115200 from 2.097152MHz
|
||
|
|
UBR10 = 0;
|
||
|
|
UMCTL0 = 0x2c; // Modulation = 0.2044
|
||
|
|
UCTL0 &= ~SWRST; // UART SWRST = 0, enable UART
|
||
|
|
IFG1 &= ~UTXIFG0;
|
||
|
|
// Initialize and enable ADC12
|
||
|
|
ADC12CTL0 = ADC12ON + SHT0_4 + REFON + REF2_5V;
|
||
|
|
// ADC12 ON, Reference = 2.5V for DAC0
|
||
|
|
ADC12CTL1 = SHP + SHS_1 + CONSEQ_2; // Use sampling timer, TA1 trigger
|
||
|
|
ADC12MCTL0 = INCH_1 + SREF_1; // Vref, channel = 1 = OA0 Out
|
||
|
|
ADC12IE = BIT0; // Enable interrupt for ADC12 MEM0
|
||
|
|
ADC12CTL0 |= ENC; // Enable conversions
|
||
|
|
// Initialize and enable Timer_A
|
||
|
|
TACTL = TASSEL0 + MC_1 + TACLR; // ACLK, Clear TAR, Up Mode
|
||
|
|
TACCTL1 = OUTMOD_2; // Set / Reset
|
||
|
|
TACCR0 = 63; // 512 samples per second
|
||
|
|
TACCR1 = 15; //
|
||
|
|
// Initialize and enable DAC12x
|
||
|
|
DAC12_0CTL = DAC12OPS + DAC12CALON + DAC12IR + DAC12AMP_2 + DAC12ENC;// DAC0 enable
|
||
|
|
DAC12_1CTL = DAC12CALON + DAC12IR + DAC12AMP_2 + DAC12ENC; // DAC1 enable
|
||
|
|
DAC12_1DAT = 0x099A; // Offset level = 1.5V for op amp bias
|
||
|
|
// Initialize and enable opamps
|
||
|
|
OA0CTL0 = OAP_1 + OAPM_1 + OAADC1; // OA0 enable power mode 1, OA0- = P6.0, 0A0+ = P6.2, OA0O = P6.1
|
||
|
|
OA0CTL1 = OARRIP; // General purpose mode, no Rail-to-Rail inputs
|
||
|
|
OA1CTL0 = OAP_3 + OAPM_1 + OAADC1; // OA1 enable power mode 1, OA1- = P6.4, OA1+ = DAC1, OA1O = P6.3
|
||
|
|
OA1CTL1 = OARRIP; // General purpose mode, no Rail-to-Rail inputs
|
||
|
|
OA2CTL0 = OAP_3 + OAPM_1 + OAADC1; // OA2 enable power mode 1, OA2+ = DAC1, OA2O = P6.5, Select inputs, power mode
|
||
|
|
OA2CTL1 = OAFC_1 + OARRIP; // Unit gain Mode, no Rail-to-Rail inputs
|
||
|
|
__enable_interrupt(); // Enable global Interrupts
|
||
|
|
} //init
|
||
|
|
|
||
|
|
void ClearLCD(void)
|
||
|
|
{
|
||
|
|
int i; //
|
||
|
|
for( i = 0; i < 20; i++){ // Clear LCDMEM
|
||
|
|
LCDMEM[i] = 0; //
|
||
|
|
}
|
||
|
|
}//clear LCD
|
||
|
|
|
||
|
|
int itobcd(int i) // Convert hex word to BCD.
|
||
|
|
{
|
||
|
|
int bcd = 0; //
|
||
|
|
char j = 0; //
|
||
|
|
|
||
|
|
while (i > 9) //
|
||
|
|
{
|
||
|
|
bcd |= ((i % 10) << j); //
|
||
|
|
i /= 10; //
|
||
|
|
j += 4;
|
||
|
|
} //
|
||
|
|
return (bcd | (i << j)); // Return converted value
|
||
|
|
}// itobcd(i)
|
||
|
|
|
||
|
|
|
||
|
|
int filterlp(int sample) // Lowpass FIR filter for EKG
|
||
|
|
{
|
||
|
|
static int buflp[32]; // Reserve 32 loactions for circular buffering
|
||
|
|
static int offsetlp = 0;
|
||
|
|
long z;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
buflp[offsetlp] = sample;
|
||
|
|
z = mul16(coeffslp[8], buflp[(offsetlp - 8) & 0x1F]);
|
||
|
|
|
||
|
|
__no_operation();
|
||
|
|
|
||
|
|
for (i = 0; i < 8; i++){
|
||
|
|
z += mul16(coeffslp[i], buflp[(offsetlp - i) & 0x1F] + buflp[(offsetlp - 16 + i) & 0x1F]);
|
||
|
|
}
|
||
|
|
|
||
|
|
offsetlp = (offsetlp + 1) & 0x1F;
|
||
|
|
return z >> 15; // Return filter output
|
||
|
|
}// int filter
|
||
|
|
|
||
|
|
int filterhp(int samplehp) // Highpass FIR filter for hear rate
|
||
|
|
{
|
||
|
|
static int bufhp[32]; // Reserve 32 loactions for circular buffering
|
||
|
|
static int offsethp = 0;
|
||
|
|
long z;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
bufhp[offsethp] = samplehp;
|
||
|
|
z = mul16(coeffshp[8], bufhp[(offsethp - 8) & 0x1F]);
|
||
|
|
|
||
|
|
for (i = 0; i < 8; i++){
|
||
|
|
z += mul16(coeffshp[i], bufhp[(offsethp - i) & 0x1F] + bufhp[(offsethp - 16 + i) & 0x1F]);
|
||
|
|
}
|
||
|
|
|
||
|
|
offsethp = (offsethp + 1) & 0x1F;
|
||
|
|
return z >> 15; // Return filter output
|
||
|
|
}// int filterhp
|
||
|
|
|
||
|
|
long mul16(register int x, register int y)
|
||
|
|
{
|
||
|
|
return ((long)x) * y;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#pragma vector = PORT2_VECTOR
|
||
|
|
__interrupt void Port2ISR (void)
|
||
|
|
{
|
||
|
|
P2IFG = 0;
|
||
|
|
}//Push buttons unused
|
||
|
|
|
||
|
|
#pragma vector = ADC_VECTOR // ADC12 ISR
|
||
|
|
__interrupt void ADC12ISR (void)
|
||
|
|
{
|
||
|
|
Datain = ADC12MEM0; // Store converted value in Datain
|
||
|
|
__bic_SR_register_on_exit(LPM0_bits); // Exit LPM0 on return
|
||
|
|
}// ADC12ISR
|
||
|
|
|
||
|
|
|