Unable to Read data On SPI..AM3517.

I'm also trying to get the spi port to write/read.  By chance, can you post or email the spi initialization code?  I'm having problems just transmitting the data out.  I can see the chip select line toggling, but I never see any activity on the clock line.

Hi david !!

The Clock will toggle when you write in transmit register. write to the transmit register in while(1) loop and then probe the clock line.

uint32_t Init_McSpi1(void)
{    
        
  //RESET
  //SET BIT SOFT RESET FOR THE MODULE
  SETBIT_REGL(MCSPI1_SYSCONFIG,MCSPI1_SYSCONFIG_SOFTRESET);
 
  //MONITOR STATUS REGISTER..IF RESET HAS BEEN DONE..WAIT TILL RESET DONE BIT IS SET
  while (!CHKBIT_REGL(MCSPI1_SYS_STAT, MCSPI1_RESETDONE))
  {
   debug_print("\r\nWaiting... SPI_SYSSTATUS   = 0x%08x\r\n", IN_REGL(MCSPI1_SYS_STAT));  // Wait for reset to complete
  }
 
  //debug_print("Soft Reset Done");
  //DATA LINE 1 Selected for Reception
 
  //Input Direction
  SETBIT_REGL(MCSPI1_SYST,1 << 8);
 
  CLRBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_IS);     // Set somi pin to receive mode
 
  CLRBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_DPE1);   // SERIAL IN MASTER OUT
  SETBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_DPE0);   // SERIAL OUT MASTER IN  
 
#if ENB_BUFF
//  SETBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_TURBO);   //  Enable Turbo Mode
//  SETBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_FFEW);    //  Enable Transmit Buffer
    SETBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_FFER);    //  Enable Receive Buffer
#endif  
 
  //Set Mode OF Operation..Transmit Receive Mode Selection
#if  TX_RX
  CLRBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_TRM_1);  //     
  CLRBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_TRM_0);  //
#endif  

//0x2 Transmit Only  Mode Selection
#if TX_ONLY   
  SETBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_TRM_1);  //
  CLRBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_TRM_0);  //
#endif
 
//0x1 Receive Only  Mode Selection
#if  RX_ONLY
  CLRBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_TRM_1);  //
  SETBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_TRM_0);  //
#endif  
 
//LoopBack Mode Selection  
#if  LOOPBACK
  CLRBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_TRM_1);  //
  CLRBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_TRM_0);  //
#endif    
 
  // PROGRAMMER CAN CHANGE THE WORD LENGTH..SPI WORD is 16 bit Long
  SETBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_WL_0);   // Select word size
  SETBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_WL_1);   //     "
  SETBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_WL_2);   //     "
  SETBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_WL_3);   //     "
  CLRBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_WL_4);   //     "
  //Active Low was commented....
  SETBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_EPOL);   // CS active low
  //Operate At 750 KHZ..
  CLRBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_CLKD_0); // Set clock divider
  SETBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_CLKD_1); //     "
  SETBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_CLKD_2); //     "
  CLRBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_CLKD_3); //     "
 
  CLRBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_POL);    // CLK inactive low
//  CLRBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_PHA);    // Odd edges sample data
  SETBIT_REGL(MCSPI1_CH0_CONF, SPI_CONF_PHA);    // Odd edges sample data
  //debug_print("Channel COnf = 0x%08x\r\n",IN_REGL(MCSPI1_CH0_CONF));

  //MODULE CONTROL        
  CLRBIT_REGL(MCSPI1_MODULCTRL, SPI_MODULCTRL_MS);         // Provide the clock in master mode
//  SETBIT_REGL(MCSPI1_MODULCTRL, SPI_MODULCTRL_SINGLE);     // Single mode Enable
  CLRBIT_REGL(MCSPI1_MODULCTRL, SPI_MODULCTRL_SINGLE);   // Single mode disable
#if LOOPBACK  
  SETBIT_REGL(MCSPI1_MODULCTRL, SPI_SYSTEST);            // Single mode                   //Loopback
  SETBIT_REGL(MCSPI1_SYST,SSB);                                                           //Loopback
  SETBIT_REGL(MCSPI1_SYST,RX_MODE);                                                       //Loopback
#endif  
    
//  this register can be used in for Word Count  
//  SETBIT_REGL(SPI_XFERLEVEL,0x01E00);
  //debug_print("Channel Module CTRL = 0x%08x\r\n",IN_REGL(MCSPI1_MODULCTRL));            
  //debug_print("Channel CH0 CTRL = 0x%08x\r\n",IN_REGL(MCSPI1_CH0_CTRL));   
  SETBIT_REGL(MCSPI1_CH0_CTRL, SPI_CTRL_EN);              // Activate channel
 return(0);
}

this is my working intialisation code. Please feel free to post if u have any issues.

thanks and regard's

Hrishikesh.

Hi david !!

Some of the comments may not be valid with respect to the code ..as i have not updated the comments.

Ok.  I'm looking through it now.  I have been writing to the TX register, but I can't seem to get it to transmit when I'm manually controlling the chip select pin.  I'll let you know if I get it working.  Thank you for your help.

I'm able to transmit data using your code, but as soon as I enable SINGLE mode it stops working.  The chip select line toggles like it should, but I never see anything on the clock line.  Have you been able to get SINLGE mode to work?

Hi David !!

Its not possible that you see data on MOSI and no clock. No i didnt try with single mode, i have used the cs in auto mode.

Try to use two probes..if u are able to catch data simultaneously you should be able to capture clock.

thanks and Regard's

Hrishikesh.