This is one of the demo programs for the MAX30003WING. This program records ECG data and prints the status register, calculated BPM, samples recorded and ETAG register value.
Dependencies: MAX30003 max32630fthr
Fork of MAX30003_Demo_Debug by
main.cpp
- Committer:
- johnGreeneMaxim
- Date:
- 2018-03-13
- Revision:
- 8:5087b009105f
- Parent:
- 7:173935a3e036
File content as of revision 8:5087b009105f:
/******************************************************************************* * Copyright (C) 2017 Maxim Integrated Products, Inc., All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Except as contained in this notice, the name of Maxim Integrated * Products, Inc. shall not be used except as stated in the Maxim Integrated * Products, Inc. Branding Policy. * * The mere transfer of this software does not imply any licenses * of trade secrets, proprietary technology, copyrights, patents, * trademarks, maskwork rights, or any other form of intellectual * property whatsoever. Maxim Integrated Products, Inc. retains all * ownership rights. ******************************************************************************* */ #include "mbed.h" #include "max32630fthr.h" #include "MAX30003.h" MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3); void ecg_config(MAX30003 &ecgAFE); /* ECG FIFO nearly full callback */ volatile bool ecgIntFlag = 0; void ecgFIFO_callback() { ecgIntFlag = 1; } int main() { // Constants const int EINT_STATUS = 1 << 23; const int RTOR_STATUS = 1 << 10; const int RTOR_REG_OFFSET = 10; const float RTOR_LSB_RES = 0.0078125f; const int FIFO_OVF = 0x7; const int FIFO_VALID_SAMPLE = 0x0; const int FIFO_FAST_SAMPLE = 0x1; const int ETAG_BITS = 0x7; // Ports and serial connections Serial pc(USBTX, USBRX); // Use USB debug probe for serial link pc.baud(115200); // Baud rate = 115200 DigitalOut rLed(LED1, LED_OFF); // Debug LEDs InterruptIn ecgFIFO_int(P5_4); // Config P5_4 as int. in for the ecgFIFO_int.fall(&ecgFIFO_callback); // ecg FIFO almost full interrupt SPI spiBus(SPI2_MOSI, SPI2_MISO, SPI2_SCK); // SPI bus, P5_1 = MOSI, // P5_2 = MISO, P5_0 = SCK MAX30003 ecgAFE(spiBus, P5_3); // New MAX30003 on spiBus, CS = P5_3 ecg_config( ecgAFE ); // Config ECG ecgAFE.writeRegister( MAX30003::SYNCH , 0); uint32_t ecgFIFO, RtoR, readECGSamples, idx, ETAG[32], status; int16_t ecgSample[32]; float BPM; while(1) { /* Read back ECG samples from the FIFO */ if( ecgIntFlag ) { ecgIntFlag = 0; pc.printf("Interrupt received....\r\n"); status = ecgAFE.readRegister( MAX30003::STATUS ); // Read the STATUS register pc.printf("Status : 0x%x\r\n" "Current BPM is %3.2f\r\n\r\n", status, BPM); // Check if R-to-R interrupt asserted if( ( status & RTOR_STATUS ) == RTOR_STATUS ){ pc.printf("R-to-R Interrupt \r\n"); // Read RtoR register RtoR = ecgAFE.readRegister( MAX30003::RTOR ) >> RTOR_REG_OFFSET; // Convert to BPM BPM = 1.0f / ( RtoR * RTOR_LSB_RES / 60.0f ); // Print RtoR pc.printf("RtoR : %d\r\n\r\n", RtoR); } // Check if EINT interrupt asserted if ( ( status & EINT_STATUS ) == EINT_STATUS ) { pc.printf("FIFO Interrupt \r\n"); readECGSamples = 0; // Reset sample counter do { ecgFIFO = ecgAFE.readRegister( MAX30003::ECG_FIFO ); // Read FIFO ecgSample[readECGSamples] = ecgFIFO >> 8; // Isolate voltage data ETAG[readECGSamples] = ( ecgFIFO >> 3 ) & ETAG_BITS; // Isolate ETAG readECGSamples++; // Increment sample counter // Check that sample is not last sample in FIFO } while ( ETAG[readECGSamples-1] == FIFO_VALID_SAMPLE || ETAG[readECGSamples-1] == FIFO_FAST_SAMPLE ); pc.printf("%d samples read from FIFO \r\n", readECGSamples); // Check if FIFO has overflowed if( ETAG[readECGSamples - 1] == FIFO_OVF ){ ecgAFE.writeRegister( MAX30003::FIFO_RST , 0); // Reset FIFO rLed=1; } // Print results for( idx = 0; idx < readECGSamples; idx++ ) { pc.printf("Sample : %6d, \tETAG : 0x%x\r\n", ecgSample[idx], ETAG[idx]); } pc.printf("\r\n\r\n\r\n"); } } } } void ecg_config(MAX30003& ecgAFE) { // Reset ECG to clear registers ecgAFE.writeRegister( MAX30003::SW_RST , 0); // General config register setting MAX30003::GeneralConfiguration_u CNFG_GEN_r; CNFG_GEN_r.bits.en_ecg = 1; // Enable ECG channel CNFG_GEN_r.bits.rbiasn = 1; // Enable resistive bias on negative input CNFG_GEN_r.bits.rbiasp = 1; // Enable resistive bias on positive input CNFG_GEN_r.bits.en_rbias = 1; // Enable resistive bias CNFG_GEN_r.bits.imag = 2; // Current magnitude = 10nA CNFG_GEN_r.bits.en_dcloff = 1; // Enable DC lead-off detection ecgAFE.writeRegister( MAX30003::CNFG_GEN , CNFG_GEN_r.all); // ECG Config register setting MAX30003::ECGConfiguration_u CNFG_ECG_r; CNFG_ECG_r.bits.dlpf = 1; // Digital LPF cutoff = 40Hz CNFG_ECG_r.bits.dhpf = 1; // Digital HPF cutoff = 0.5Hz CNFG_ECG_r.bits.gain = 3; // ECG gain = 160V/V CNFG_ECG_r.bits.rate = 2; // Sample rate = 128 sps ecgAFE.writeRegister( MAX30003::CNFG_ECG , CNFG_ECG_r.all); //R-to-R configuration MAX30003::RtoR1Configuration_u CNFG_RTOR_r; CNFG_RTOR_r.bits.wndw = 0b0011; // WNDW = 96ms CNFG_RTOR_r.bits.rgain = 0b1111; // Auto-scale gain CNFG_RTOR_r.bits.pavg = 0b11; // 16-average CNFG_RTOR_r.bits.ptsf = 0b0011; // PTSF = 4/16 CNFG_RTOR_r.bits.en_rtor = 1; // Enable R-to-R detection ecgAFE.writeRegister( MAX30003::CNFG_RTOR1 , CNFG_RTOR_r.all); //Manage interrupts register setting MAX30003::ManageInterrupts_u MNG_INT_r; MNG_INT_r.bits.efit = 0b00011; // Assert EINT w/ 4 unread samples MNG_INT_r.bits.clr_rrint = 0b01; // Clear R-to-R on RTOR reg. read back ecgAFE.writeRegister( MAX30003::MNGR_INT , MNG_INT_r.all); //Enable interrupts register setting MAX30003::EnableInterrupts_u EN_INT_r; EN_INT_r.bits.en_eint = 1; // Enable EINT interrupt EN_INT_r.bits.en_rrint = 1; // Enable R-to-R interrupt EN_INT_r.bits.intb_type = 3; // Open-drain NMOS with internal pullup ecgAFE.writeRegister( MAX30003::EN_INT , EN_INT_r.all); //Dyanmic modes config MAX30003::ManageDynamicModes_u MNG_DYN_r; MNG_DYN_r.bits.fast = 0; // Fast recovery mode disabled ecgAFE.writeRegister( MAX30003::MNGR_DYN , MNG_DYN_r.all); // MUX Config MAX30003::MuxConfiguration_u CNFG_MUX_r; CNFG_MUX_r.bits.openn = 0; // Connect ECGN to AFE channel CNFG_MUX_r.bits.openp = 0; // Connect ECGP to AFE channel ecgAFE.writeRegister( MAX30003::CNFG_EMUX , CNFG_MUX_r.all); return; }