ADS1292R: SPI communication init

Hi Mate,

Welcome to our e2e forum! Can you please share your schematic and a picture of what you see on the oscilloscope?

Hey Tom, 

thanks for fast reply, I'm currently at home so I don't have oscilloscope. Will share everything first thing in the morning. Im from Croatia, that's for 12 hours.

Cheers!

Hi, below is whole code for better visualisation I hope. I've tried whole morning to come up with something, even with source code from 
ADS_1x9x_ECG_recorder_ Firmwire, but I just don't know what is going on

Sclk is 1MHz and pic clock is 8MHz

int main(int argc, char** argv) {
    int mate=0;
    EnableWDT(WDT_DISABLE);  
    
    TTG_Configure();
    
       TTG_inCodeDelayMs(500);
       TTG_inCodeDelayMs(500);
       TTG_inCodeDelayMs(500);
       TTG_inCodeDelayMs(500);
       
      
        
      // initADS1292();
    //worker();
    initADS1292();
    while(1){ 
         /* ADS1292_StartC();
        if( ADS_DRDY==0){
            ADS1292_UpdateChannelData();
        }*/
        
        

       
       TTG_inCodeDelayMs(500);
       read_byte(0x00);
        mate++;
        mate++;
        mate++;
                
        /*
        TTG_inCodeDelayMs(200);
    BT_OTA=0;
       TTG_inCodeDelayMs(200);
    BT_OTA=1;*/
    }

    return (EXIT_SUCCESS);
}

void write_byte(unsigned char reg_addr, unsigned char val_hex) {
    CS_SELECT;
    TTG_inCodeDelayMs(1);
    WriteSPI1(0x40 | reg_addr);
    TTG_inCodeDelayMs(1);
    WriteSPI1 (0x00);
    TTG_inCodeDelayMs(1);
    WriteSPI1 (val_hex);
    TTG_inCodeDelayMs(2);
    CS_DESELECT;
}

unsigned char read_byte (unsigned char reg_addr) {
    int out=0;
    CS_SELECT;
    WriteSPI1 (0x20 | reg_addr);
    TTG_inCodeDelayMs(1);
    WriteSPI1 (0x00); //number of registers to be read/written -1
    TTG_inCodeDelayMs(1);
    out = ReadSPI1();
    TTG_inCodeDelayMs(1);
    CS_DESELECT;
    return (out);
}

void send_command(unsigned char cmd) {
    CS_SELECT;
    TTG_inCodeDelayMs(2);
    WriteSPI1 (cmd);
    TTG_inCodeDelayMs(2);
    CS_DESELECT; 
}

void initADS1292(){
    int i;
    
    ADS_RESET_OFF;
    for(i=0;i<5000;i++);//wait 1msec
    ADS_RESET_ON 
    for(i=0;i<5000;i++);//wait 1msec              
    ADS_RESET_OFF;
    for(i=0;i<35000;i++)//wait
    
    
 
            
     
  
    TTG_inCodeDelayMs(500);
      
    
    
    //Send SDATAC command (Stop read data continuosly mode)
    send_command(SDATAC);
              
   
   /* SPI_in_buff[SPI_in_buff_len++] = (unsigned char)ReadSPI1(); //Read the recieved data from Buffer
  if (SPI_in_buff_len == MAX_IN_SPI)
  {
      SPI_in_buff_len = 0;
  }
    */
    //All GPIO set to output
     
    
    
    
    write_byte(CONFIG1,0x02);//continuous conversion, 500SPS
    
    write_byte(CONFIG2,0xA0);//Vref,CLK_EN as output,test
    TTG_inCodeDelayMs(500);
    write_byte(CONFIG2,0xA3);
    for(i=0;i<5000;i++)//wait 1msec
    TTG_inCodeDelayMs(1);
    write_byte(CH1SET,0x05);
    for(i=0;i<5000;i++)//wait 1msec
    write_byte(CH2SET,0x05);
    for(i=0;i<5000;i++)//wait 1msec
    write_byte(GPIO, 0x00);
    for(i=0;i<5000;i++)//wait 1msec
    write_byte(LOFF,0x10);
    for(i=0;i<5000;i++)//wait 1msec
    write_byte(RLD_SENS,0x00);
    for(i=0;i<5000;i++)//wait 1msec
    write_byte(LOFF_SENS,0x00);
    for(i=0;i<5000;i++)//wait 1msec
    write_byte(LOFF_STAT,0x00);
    for(i=0;i<5000;i++)//wait 1msec
    write_byte(RESP1,0x02);
    for(i=0;i<5000;i++)//wait 1msec
    write_byte(RESP2,0x01);
    
    
    
    }

Schematic

Oscilloscope - yellow - SCLK, blue - Din

Oscilloscope - Same channels with 500us period

Couldn't even upload pictures correctly :)

Hi Mate,

I don't immediately see anything in your schematic that would cause a problem. So things to look for though, check and verify AVDD and DVDD against AVSS to be sure you have power. Check and verify the state of CLKSEL and the CLK source, the state of PWDN/RESET, and /CS.

Cool! Thank's for letting us know!