File content as of revision 2:812d40f1853d:

#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 ecgFIFOIntFlag = 0; 
void ecgFIFO_callback()  {
    
    ecgFIFOIntFlag = 1;

}  

int main()
{
    Serial pc(USBTX, USBRX);            // Use USB debug probe for serial link
    pc.baud(115200);                    // Baud rate = 115200
    
    DigitalOut rLed(LED1, LED_OFF);      // Debug LEDs
    DigitalOut gLed(LED2, LED_OFF);
    DigitalOut bLed(LED3, LED_OFF);
    
    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;
    ecgAFE = new MAX30003(spiBus, P5_3);    // New MAX30003 on spiBus, CS = P5_3 
    ecg_config(*ecgAFE);                    // Config ECG 
     
    
    ecgAFE->writeRegister( MAX30003::SYNCH , 0);
    
    uint32_t ecgFIFO, readSamples, idx, ETAG[32], status, RtoR;
    int16_t ecgSample[32];
    float BPM;
    
    while(1) {
        
        bLed = LED_ON;
        
        /* Read back ECG samples from the FIFO */
        if( ecgFIFOIntFlag ) {
            pc.printf("Interrupt received....\r\n");
            bLed = LED_OFF;
                     // Clear interrupt flag
            
            status = ecgAFE->readRegister( MAX30003::STATUS );
            pc.printf("Status : 0x%x\r\nCurrent BPM is %f\r\n\r\n", status, BPM);
            
            
            if( ( status & (1<<10) ) == (1<<10) ){
                ecgFIFOIntFlag = 0;
                pc.printf("R-to-R Interrupt \r\n");
                RtoR = ecgAFE->readRegister( MAX30003::RTOR );
                BPM = 60.0*RtoR/32768.0;
                pc.printf("RtoR : %d\r\n\r\n", RtoR);
            } 
             
            if ( ( status & (1<<23) ) == (1<<23) ) {
                ecgFIFOIntFlag = 0;
                pc.printf("FIFO Interrupt \r\n");
                readSamples = 0;            // Reset sample counter
                do {
                    ecgFIFO = ecgAFE->readRegister( MAX30003::ECG_FIFO );   // Read FIFO
                    ecgSample[readSamples] = ecgFIFO >> 8;                  // Isolate voltage data
                    ETAG[readSamples] = ( ecgFIFO >> 3 ) & 0b111;           // Isolate ETAG
                    readSamples++;                                          // Increment sample counter
                } while ( ETAG[readSamples-1] == 0x0 || ETAG[readSamples-1] == 0x1 );   // Check that sample is valid
            
                pc.printf("%d samples read from FIFO \r\n", readSamples);
                
                for( idx = 0; idx < readSamples; 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;
    CNFG_GEN_r.bits.rbiasn = 1;
    CNFG_GEN_r.bits.rbiasp = 1;
    CNFG_GEN_r.bits.en_rbias = 1;
    CNFG_GEN_r.bits.imag = 2;
    CNFG_GEN_r.bits.en_dcloff = 1;    
    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;
    CNFG_ECG_r.bits.dhpf = 1;
    CNFG_ECG_r.bits.gain = 3; 
    CNFG_ECG_r.bits.rate = 3;  
    ecgAFE.writeRegister( MAX30003::CNFG_ECG , CNFG_ECG_r.all);
      
    
    //R-to-R configuration
    MAX30003::RtoR1Configuration_u CNFG_RTOR_r;
    CNFG_RTOR_r.bits.en_rtor = 1;    
    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;   
    MNG_INT_r.bits.clr_rrint = 0b01;
    ecgAFE.writeRegister( MAX30003::MNGR_INT , MNG_INT_r.all);
    
    
    //Enable interrupts register setting
    MAX30003::EnableInterrupts_u EN_INT_r;
    EN_INT_r.all = 0;
    EN_INT_r.bits.en_eint = 1;
    EN_INT_r.bits.en_rrint = 1;
    EN_INT_r.bits.intb_type = 0b11;
    ecgAFE.writeRegister( MAX30003::EN_INT , EN_INT_r.all);
       
       
    //Dyanmic modes config
    MAX30003::ManageDynamicModes_u MNG_DYN_r;
    MNG_DYN_r.bits.fast = 0;    
    ecgAFE.writeRegister( MAX30003::MNGR_DYN , MNG_DYN_r.all);
       
    
    //MUX Config
    MAX30003::MuxConfiguration_u CNFG_MUX_r;
    CNFG_MUX_r.bits.pol = 0;    
    ecgAFE.writeRegister( MAX30003::CNFG_EMUX , CNFG_MUX_r.all);
    
    return;
}