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Data not Receive properly in DSPI?

Question asked by Sourabh Jain on Apr 4, 2019
Latest reply on Apr 15, 2019 by Sourabh Jain

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Hi,

I am using S32 Design Studio.

S32 Design Studio for Power Architecture

Version: 1.2
Build id: 170613

MCU == MPC5777C

evb == MPC5777C EVB

debugger == Multilink universal fx

Operating System == Win7x64,Win8x64

Case 1:
System clock : 192 MHz(PLL0)
DSPI module Clock : 96 MHz
PER CLK SELECT : PLL0
PER CLK : 96 MHz
SCK BAUD RATE : 4 MHz
In this case the Data send on MOSI line is received properly on MISO line. 

 
Case 2:
System clock : 264 MHz(PLL1)
DSPI module Clock : 132 MHz
PER CLK SELECT : PLL0
PER CLK : 96 MHz
SCK BAUD RATE : 4 MHz
In this case the Data send on MOSI line is not received properly on MISO line. 

In both the case SCK baud rate is same which is derived from PER CLK but module clock is different.

Is DSPI module clock has any effect on data send and receive functionality?

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7 Replies

David Tosenovjan Apr 5, 2019 4:37 AM
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Hi, case 2 is out of maximum allowed DSPI frequency.
See datasheet screenshot below
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- Sourabh Jain @ David Tosenovjan on Apr 7, 2019 10:32 PM
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  Hi David,
  
  As per your suggestion i have changed the DSPI module clock to 66 MHz which is less than maximum 100 MHz frequency.
  But still the problem remain same and i am not able to receive the data properly.
  
  Thanks and Regards,
  Sourabh
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  - David Tosenovjan @ Sourabh Jain on Apr 9, 2019 1:20 AM
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    Could you shows details of this setting?
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    - Sourabh Jain @ David Tosenovjan on Apr 9, 2019 2:29 AM
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      Hi David,
      
      here is system clock initialization of core clock 264 MHz.
      System clock : 264 MHz(PLL1)
      DSPI module Clock : 66 MHz
      
      void SystemClk_init(void)
      {
      PLLDIG.PLL0CR.B.CLKCFG = 0; // Disable PLL0
      PLLDIG.PLL1CR.B.CLKCFG = 0; // Disable PLL1
      SIU.SYSDIV.B.PLL0SEL= 0x0; // PLLOSEL = 0 The crystal oscillator (XOSC) is the clock source for PLL0
      SIU.SYSDIV.B.PLL1SEL = 0x1; // PLL1SEL = 1 The PHI1 output of PLL0 is the clock source for PLL1
      // configure PLL0 to 192 MHz (40 MHz XOSC reference)
      //configure PLL1 to 264 MHz (48 MHz PLL0 PHI1 output reference)
      /* Configure PLL0 Dividers - 160MHz from 20Mhz XTAL oscillator */
      PLLDIG.PLL0DV.B.RFDPHI1 = 0x0C;
      PLLDIG.PLL0DV.B.RFDPHI = 0x3;
      PLLDIG.PLL0DV.B.PREDIV = 0x5;
      PLLDIG.PLL0DV.B.MFD = 0x48;
      /* Wait for stable XOSC */
      SIU.RSR.B.XOSC = 0x1; //0 XOSC clock not stable yet
      //1 XOSC clock is stable
      /*Turn on PLL0 and wait for lock */
      PLLDIG.PLL0CR.B.CLKCFG = 0x3; //Turn on PLL0
      while(1)
      {
      if(PLLDIG.PLL0SR.B.LOCK == 0x01) // PLL is locked
      break;
      }
      /* Configure PLL1 Dividers - 200MHz from 20Mhz XTAL oscillator */
      PLLDIG.PLL1DV.B.RFDPHI = 0x02;
      PLLDIG.PLL1DV.B.MFD = 0x16;
      /*Turn on PLL1 and wait for lock */
      PLLDIG.PLL1CR.B.CLKCFG = 0x3; //Turn on PLL0
      while(1)
      {
      if(PLLDIG.PLL1SR.B.LOCK == 0x1) // PLL is locked
      break;
      }
      /* Select clock dividers and sources */
      SIU.SYSDIV.B.LCK = 0x0; // LCK = 0 SIU_SYSDIV register is unlocked and writes are permitted
      SIU.SYSDIV.B.PLL0SEL= 0x0; // PLLOSEL = 0 The crystal oscillator (XOSC) is the clock source for PLL0
      SIU.SYSDIV.B.PLL1SEL = 0x1; // PLL1SEL = 1 The PHI1 output of PLL0 is the clock source for PLL1
      SIU.SYSDIV.B.PERCLKSEL = 0x1; // PERCLKSEL = 1 Clock is connected to the non-FM clock domain
      SIU.SYSDIV.B.PERDIV = 0x0; // PERDIV = 0 Divide by 2.
      SIU.SYSDIV.B.MCANSEL = 0x0; // MCANSEL = 0 The crystal oscillator (XOSC) is the clock source for the MCAN modules.
      SIU.SYSDIV.B.SYSCLKSEL = 0x2; // SYSCLKSEL = 11 The system clock is driven by the non FM PLL (PLL0)
      SIU.SYSDIV.B.FMPERDIV = 0x1;
      SIU.SYSDIV.B.ETPUDIV = 0x1; // ETPUDIV = 1 Divide by 1.
      SIU.SYSDIV.B.SYSCLKDIV = 0x4; // SYSCLKDIV = 100 Divide by 1
      SIU.SYSDIV.B.PCSEN = 0x0; // PCSEN = 0 PCS disabled
      SIU.ECCR.R =0x00000581;
      SIU.SDCLKCFG.R = 0x0000000B;
      SIU.LFCLKCFG.R = 0x00000001;
      SIU.PSCLKCFG.R = 0x000100BF;
      }
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      - David Tosenovjan @ Sourabh Jain on Apr 12, 2019 7:33 AM
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        Whether you have seen following clock calculator. You may configure your clock settings by clicks and it checkes all frequency limits. In the summary tab, you may see configuration of all registers.
        
        https://www.nxp.com/docs/en/application-note/AN12176.pdf
        https://www.nxp.com/docs/en/application-note-software/AN12176SW.zip
        
        Hope it helps.
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        Sourabh Jain @ David Tosenovjan on Apr 14, 2019 10:53 PM
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        Hi David,
        
        I have checked the application note AN12176 which you have mention.
        
        In that application note i have found out MPC5777C Frequency limits here snap is attached.
        Here
        FM_PER_CLK = 132 MHz (MAX) which drive the module clock of DSPI.
        PER_CLK = 132 MHz (MAX) which drive Protocol clock of DSPI.
        
        So right now i am using PER_CLK 96 MHz through which i derived SCK baud rate 4 MHz.
        
        Case 1:
        System clock : 192 MHz(PLL0)
        DSPI module Clock : 96 MHz
        PER CLK SELECT : PLL0
        PER CLK : 96 MHz
        SCK BAUD RATE : 4 MHz
        In this case the Data send on MOSI line is received properly on MISO line.
        
        Case 2:
        System clock : 264 MHz(PLL1)
        DSPI module Clock : 132 MHz
        PER CLK SELECT : PLL0
        PER CLK : 96 MHz
        SCK BAUD RATE : 4 MHz
        In this case the Data send on MOSI line is not received properly on MISO line.
        
        I have only changes the DSPI module clock which FM_PER_CLK from initially 96 MHz to 132 MHz and in this case my DSPI not working properly.
        
        Why is this happening ?
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- Sourabh Jain @ David Tosenovjan on Apr 15, 2019 2:30 AM
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  Hi David,
  
  Here the maximum frequency 100 MHz which you are talking about is DSPI protocol clock which is generated from PER_CLK. My PER_CLK is 96 MHz for both above Cases which i referred.
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