File content as of revision 1:8316c23ec6b9:

/** ECG ADS1291 Test program.
ADS1291 is a single channel ECG chip
with a 24 bit Sigma-Delta ADC
 */
 
#include "mbed.h"
//#include "timer.h"
#include <string.h>
#include <stdio.h>
#include "ds3231.h"
#include "SDFileSystem.h"
#include "ecg_dec.h"
#include "rtc.h"
#include "sdcard.h"
//#include "rtos.h"

//SPI SETTINGS
#define baud_rate 115200
#define freq 1000000
#define bits 8 
#define mode 1 
#define loop 1000000 

//PIN DECLARATIONS
Serial pc(USBTX,USBRX);
DigitalIn DRDY_BAR(PTC8);
DigitalOut CHIPSEL_BAR(PTD0);
DigitalOut ADS_START(PTC16);
DigitalOut RESET_BAR(PTC17);

//FILE *fp = NULL;


//unsigned char chk2= 0;
float value = 0;
unsigned int value1 = 0;
unsigned int value2 = 0;
unsigned int value3 = 0;
unsigned int value4 = 0;
unsigned int value5 = 0;
unsigned int value6 = 0;
unsigned int data1 = 0;
unsigned int count = 0;

//static int32_t ecg_x[500];
SPI mySpi(PIN_MOSI, PIN_MISO, PIN_SCLK) ; /* SPI is the spi function written in mbed and mySpi is the instance name*/

typedef void (*func_ptr)(void) ; /*creates typedef to function pointer, does not take any arguement and returns void*/

void doHelp(void) ;
void doStatus(void) ;
void doFreq(void) ;
void doMode(void) ;
void doBit(void) ;
void doWrite(void) ;
void doWrite2(void) ;
void doRead(void) ;
void doLoop(void) ;
void setup(void);
void testsetup(void);
void ecgsetup(void);
void regWrite(int,int);
void cmdWrite(int);
void regRead(int);
void lpf_coef(void);
float lpf( float coeff[5], float);
void drdy_int(void);
/*FILE *sd_openfile(char *buf);
void sd_write (FILE *n,int value);
void sd_close(FILE *n);
time_t rtc_read();*/

typedef struct _cmd_func {
    char *name ;
    func_ptr func ;
} cmd_func_type ;

cmd_func_type cmd_list[] = {   /*"cmd_func_type cmd_list[]" is same as "struct cmd_list[]"*/
    {"help", doHelp},
    {"status", doStatus},
    {"freq", doFreq},
    {"mode", doMode},
    {"bit",  doBit},
    {"write", doWrite},
    {"read",  doRead},
    {"loop", doLoop},
    { 0, 0 }
} ;

func_ptr getFunc(char *cmd)  /*here "func_ptr is same as void*/
{
    int i = 0 ;
    while(cmd_list[i].name != 0) {
        if (strcmp(cmd, cmd_list[i].name) == 0) {
            return(cmd_list[i].func) ; ;
        }
        i++ ;
    }
    return(0) ;
}

void doHello()
{
    printf("=== spi test program ===\n\r") ;
    printf("please set your terminal program\n\r") ;
    printf("local echo on\n\r") ;
    printf("\n\r") ; 
}
    
int ecg(int pid) {
 //time_t epoch_time;
  //int fp;
 int concatenate_value = 0;
 
//uint32_t ecg_buf[1500];
//int32_t ecg_der[1500];
//int buff1[15]= {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
int32_t sample_sum; // static int32_t avg[1500];
  count = 0; int32_t fs = 500; int32_t w=0,w1=0;
Timer t;
   unsigned char chk = 1;
    pc.baud(baud_rate);
    mySpi.frequency(freq) ;
    mySpi.format(bits, mode) ; 
  //  Ds3231 rtc(PTC11, PTC10); //sda,scl2yy
   
    

   //Initialize ADS1291   
    setup() ;  
    
    //Put device back in RDATAC mode
    cmdWrite(CMD_RDATAC) ;
//   printf("The device is in RDATAC mode\n");
//Activate conversion, At this point DRDY should toggle
    ADS_START = 1;
     
  //    printf( "ADC noise data is= \n");
   for(int i=0;i<N_ERR;i++)
     {
     while(DRDY_BAR);
    doWrite() ;
    //printf( "ADC status is= %X %X %X\n", value1,value2,value3);
    concatenate_value = ((value4<< LSHIFT_16)|(value5 <<LSHIFT_8) |(value6));
 //   printf( "%X\n", concatenate_value);
    }


   /*testsetup();    // To set the ADS1291 registers for internal test signal generation
    wait(0.2);
    cmdWrite(CMD_RDATAC) ;
    //printf("The device is in RDATAC mode\n");
   // printf("Test data is\n");
    ADS_START = 1;
     //printf("Test data is\n");
     sd_open_file();
    
    for(int j=0;j<N_TEST;j++)
    {
    while(DRDY_BAR);
    doWrite() ;
    concatenate_value = ((value4<< LSHIFT_16)|(value5 <<LSHIFT_8) |(value6));
   
    sd_write(concatenate_value);
   pc.printf("%d\n",concatenate_value);
 // fprintf(fp,"%d\n",concatenate_value) ;
  }
  sd_close();*/
  
 ecgsetup();   // To set the ADS1291 registers for ECG signal generation
//  printf("\n Reading****");
    //DRDY_BAR1.enable_irq();
   cmdWrite(CMD_RDATAC) ;
//    printf("The device is in RDATAC mode\n");
    ADS_START = 1;
    chk = 1;
    t.start();
   sd_open_ECGfile(pid);
    for(int i=0; i<N_ECG; i++)
    {
    while(DRDY_BAR);
    doWrite() ;
    concatenate_value = ((value4<< 16)|(value5 <<8) |(value6));
    sd_write(concatenate_value);
    //printf( "%d\n", concatenate_value);
    }
   sd_close();
   t.stop();
   printf( "%f\n", t.read());
 /* 
  // remove DC of ecg signal    
  uint32_t  ecg_mean=0, buf_length = 500; 
 printf("DC removed\ ECG Data\n");
  for (int k=0 ; k<buf_length ; k++ ) 
        {ecg_mean = ecg_mean+ ecg_buf[k] ;
       ///  printf("ecg_mean is %d\n",ecg_mean);
         }
   ecg_mean =ecg_mean/buf_length ;
    //printf("ecg_mean is %d\n",ecg_mean);
    for (k=0 ; k<buf_length ; k++ )  
    {
        ecg_x[k] =  ecg_buf[k] - ecg_mean ; 
        printf("%d\n",(ecg_x[k]));
  }
  */
 // 4 pt Moving Average
 /*printf("Averaged ECG Data\n");
    for(int k=0; k<N_ECG; k++)
    {
 //     sample_sum= ( ecg_x[k]+ecg_x[k+1]+ ecg_x[k+2]+ ecg_x[k+3]);
        sample_sum= ( ecg_buf[k]+ecg_buf[k+1]+ ecg_buf[k+2]+ ecg_buf[k+3]);
        ecg_buf[k]=  sample_sum/(int32_t)4; 
      
//        printf("%d\n",(ecg_buf[k]));
    }
    
    // Derivative filtering of the averaged ECG signal
//    printf("Derivative filtered ECG Data\n");
    ecg_der[0]=0;
    for(int k=0; k<N_ECG-3; k++)
    {
        w1= (fs*(ecg_buf[k+1]-ecg_buf[k]));
        //w1=1;
      //  w=0.995;
      //  ecg_der[k]=(w+w1);
        w=(1*ecg_der[k]); 
        ecg_der[k+1]=(w1+w);
         // printf("ecg_der[k+1]=%d\n",(ecg_der[k+1]));
      //  printf("w=%f\n", w);
      //  printf("w1=%f\n", w1);
 //       printf("%d\n",(ecg_der[k]));
        //printf("k=%d\n", k);
    }*/
 }    // End of main function

//for initial configurations
void setup()
{
   //initially make all inputs low until power is up and stabilized
    CHIPSEL_BAR = 0;
    ADS_START = 0;
    RESET_BAR = 0;
    //wait for oscillator to wake up
    wait(1);     
    
    CHIPSEL_BAR = 1;
    RESET_BAR = 1; //wait for tpor time
    //wait for power on reset
    wait(1);
    RESET_BAR = 0; // send a reset pulse and wait for t_reset amount of time
    wait(1);
    RESET_BAR = 1;//release the reset
    //Wait for 18 tclks = 36 us
    wait_us(36);
    
    //Device wakes up in RDATAC mode so send SDATAC command to write to registers
    cmdWrite(CMD_SDATAC) ;
//    printf("Device is in SDATAC mode\n");
    
    regRead(REG_ID);
    printf("DEVICE ID register read from ADS is= 0x%X\n",data1);
    wait(1);
    
    //Since we are using internal 2.42V reference and enable clock on the CLK PIN
    //Write 0xA8 to CONFIG2 register
    regWrite(REG_CONFIG2,no_mode);
       
    //Set continuous sampling mode, 500 SPS
    regWrite(REG_CONFIG1,sps500);
        
    //PGA Gain = 6, inputs shorted for noise measurements
    regWrite(REG_CH1SET, offset_meas);
    
    //read data from CONFIG2 register
    regRead(REG_CONFIG2);
//    printf("REG_CONFIG2 register read from ADS for initial setup is= 0x%X\n",data1);
    
    //read data from CONFIG1 register
    regRead(REG_CONFIG1);
//    printf("REG_CONFIG1 register read from ADS for initial setup is= 0x%X\n",data1);
    
    //read data from CONFIG1 register
    regRead(REG_CH1SET);
//    printf("REG_CH1SET register read from ADS for initial setup is= 0x%X\n",data1);
}   

void testsetup()
{
 //Send SDATAC command to write to registers to set test signals 
    cmdWrite(CMD_SDATAC) ;
    printf("Device is in SDATAC mode\n");
            
    //Since we are using internal 2.42V reference and enable clock on the CLK PIN
    //Write 0xA3 to CONFIG2 register to set test signal and its freq = 1Hz
    regWrite(REG_CONFIG2,test_mode);
       
    //PGA Gain = 6, test signal selected
    regWrite(REG_CH1SET, test_inp);
    
    //read data from CONFIG2 register
    regRead(REG_CONFIG2);
   printf("REG_CONFIG2 register read from ADS for test signal setup is= 0x%X\n",data1);
    
    //read data from CONFIG1 register
    regRead(REG_CH1SET);
   printf("REG_CH1SET register read from ADS for test signal setup is= 0x%X\n",data1);  
}

void ecgsetup()
{
cmdWrite(CMD_SDATAC) ; //Set to SDATAC mode to set CH1SET register

regWrite(REG_CONFIG1,sps500);
regWrite(REG_CONFIG2, default_mode);//put INT_TEST and TEST_FREQ bits to default mode(set those bits to '0')
regWrite(REG_LOFF, loff_conf);
regWrite(REG_CH1SET, elec_inp);// Set to read normal electrode input
regWrite(REG_RLD_SENS, rld_sens_sig);//Set RLD_SENS
regWrite(REG_LOFF_SENS, loff_sens_sig);//Set LOFF_SENS
regWrite(REG_MISC1, misc1_inp );//Set RESP1
regWrite(REG_MISC2, misc2_inp );//Set RESP2
//printf("connect ECG leads\n");
wait(0.5);
regRead(REG_LOFF_STAT);//Read LOFF_STAT register
printf("REG_LOFF_STAT register read from ADS for ecg setup is= 0x%X\n",data1); 
}

void doHelp(void) 
{
    printf("=== spi test ===\n\r") ;
    printf("commands available\n\r") ;
    printf("help\n\r") ;
    printf("status\n\r") ;
    printf("freq freq_in_hz\n\r") ;
    printf("mode (0 | 1 | 2 | 3)\n\r") ;
    printf("bit (4 - 16)\n\r") ;
    printf("write value\n\r") ;
    printf("read\n\r") ;
    printf("loop number (set repeat number for read/write)\n\r") ;
}

void doStatus(void)
{
    printf("=== Status Report ===\n\r") ;
    printf("bits: %d\n\r", bits) ;
    printf("mode: %d\n\r", mode) ;
    printf("freq: %d Hz\n\r", freq) ;
    printf("loop: %d\n\r", loop) ;
}

void doFreq(void)
{
  //  int freq = 0 ;
   // scanf("%d", &freq) ;
    printf("setting frequency to %d\n\r", freq) ;
    mySpi.frequency(freq) ;
}

void doMode(void)
{
    //scanf("%d", &mode) ;
    printf("setting format(%d, %d)\n\r",bits, mode) ;
    mySpi.format(bits, mode) ;       
}

void doBit(void) 
{
   // scanf("%d", &bits) ;
    printf("setting format(%d, %d)\n\r",bits, mode) ;
    mySpi.format(bits, mode) ;
}

void doWrite(void) 
{    
       
     //DRDY_BAR1.disable_irq();
      
        CHIPSEL_BAR = 0;
       // int freq1 = 50000;
       // mySpi.frequency(freq1) ;
        value1 =  mySpi.write(0x00);
        value2 =  mySpi.write(0x00);
        value3 =  mySpi.write(0x00);
        value4 =  mySpi.write(0x00);
        value5 =  mySpi.write(0x00);
        value6 =  mySpi.write(0x00);
      
        CHIPSEL_BAR = 0;    
        //DRDY_BAR1.enable_irq();
}

void doRead(void) 
{
    int dummy = 0 ;
   
    while(!DRDY_BAR)
    ADS_START = 0;
    
        value = mySpi.write(dummy) ;
         
}

void doLoop(void)
{
   // scanf("%d", &loop) ;
    printf("repeat number has been set to %d\n\r", loop) ;
}

void cmdWrite(int data) 
{
         CHIPSEL_BAR = 0;
         mySpi.write(data) ;
         wait_ms(1);
         CHIPSEL_BAR = 1;  
}

void regWrite(int address, int data) 
{
    int data_to_send = CMD_WREG << 5;
    data_to_send = data_to_send | address;
         CHIPSEL_BAR = 0;
         mySpi.write(data_to_send);
         wait_ms(1);
         mySpi.write(0x00) ;
         wait_ms(1);
         mySpi.write(data) ;
         wait_ms(1);
         CHIPSEL_BAR = 1;  
}

void regRead(int address)
{
    int data_to_receive = CMD_RREG << 5;
    data_to_receive = data_to_receive | address;
         CHIPSEL_BAR = 0;
         mySpi.write(data_to_receive);
         wait_ms(1);
         mySpi.write(0x00) ;
         wait_ms(1);
         data1 = mySpi.write(0x00) ;
                  
         //printf("DEVICE ID register read from ADS is= 0x%X\n",data1);
         
         //wait_ms(1);
         CHIPSEL_BAR = 1;       
}