example_2834xecanback2back.c

德州儀器新款DSP TMS320C2834X 晶片 eCAN程式設計.

// TI File $Revision: /main/3 $
// Checkin $Date: May 5, 2008   17:02:38 $
//###########################################################################
//
// FILE:    Example_2834xECanBack2Back.c
//
// TITLE:   DSP2834x eCAN Back-to-back transmission and reception in
//          SELF-TEST mode
//
// ASSUMPTIONS:
//
//    This program requires the DSP2834x header files.
//
//    This progrm uses the peripheral's self test mode.
//    Other then boot mode configuration, no other hardware configuration
//    is required.
//
//    As supplied, this project is configured for "boot to SARAM"
//    operation.  The 2834x Boot Mode table is shown below.
//    For information on configuring the boot mode of an eZdsp,
//    please refer to the documentation included with the eZdsp,
//
//       $Boot_Table:
//
//         GPIO87   GPIO86     GPIO85   GPIO84
//          XA15     XA14       XA13     XA12
//           PU       PU         PU       PU
//        ==========================================
//            1        1          1        1    TI Test Only
//            1        1          1        0    SCI-A boot
//            1        1          0        1    SPI-A boot
//            1        1          0        0    I2C-A boot timing 1
//            1        0          1        1    eCAN-A boot timing 1
//            1        0          1        0    McBSP-A boot
//            1        0          0        1    Jump to XINTF x16
//            1        0          0        0    Jump to XINTF x32
//            0        1          1        1    eCAN-A boot timing 2
//            0        1          1        0    Parallel GPIO I/O boot
//            0        1          0        1    Parallel XINTF boot
//            0        1          0        0    Jump to SARAM	    <- "boot to SARAM"
//            0        0          1        1    Branch to check boot mode
//            0        0          1        0    I2C-A boot timing 2
//            0        0          0        1    Reserved
//            0        0          0        0    TI Test Only
//                                              Boot_Table_End$$
//
// DESCRIPTION:
//
//    This test transmits data back-to-back at high speed without
//    stopping.
//    The received data is verified. Any error is flagged.
//    MBX0 transmits to MBX16, MBX1 transmits to MBX17 and so on....
//    This program illustrates the use of self-test mode
//
//###########################################################################
// Original Author H.J.
//
// $TI Release: C2834x Header Files V1.00 $
// $Release Date: February 25, 2009 $
//###########################################################################

#include "DSP28x_Project.h"     // Device Headerfile and Examples Include File

// Prototype statements for functions found within this file.
void mailbox_check(int32 T1, int32 T2, int32 T3);
void mailbox_read(int16 i);

// Global variable for this example
Uint32  ErrorCount;
Uint32  PassCount;
Uint32  MessageReceivedCount;

Uint32  TestMbox1 = 0;
Uint32  TestMbox2 = 0;
Uint32  TestMbox3 = 0;

void main(void)
{

    Uint16  j;

// eCAN control registers require read/write access using 32-bits.  Thus we
// will create a set of shadow registers for this example.  These shadow
// registers will be used to make sure the access is 32-bits and not 16.
   struct ECAN_REGS ECanaShadow;

// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2834x_SysCtrl.c file.
   InitSysCtrl();

// Step 2. Initalize GPIO:
// This example function is found in the DSP2834x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
// InitGpio();  // Skipped for this example

// For this example, configure CAN pins using GPIO regs here
// This function is found in DSP2834x_ECan.c
   InitECanGpio();

// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts
   DINT;

// Initialize PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.
// This function is found in the DSP2834x_PieCtrl.c file.
   InitPieCtrl();

// Disable CPU interrupts and clear all CPU interrupt flags:
   IER = 0x0000;
   IFR = 0x0000;

// Initialize the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
// This will populate the entire table, even if the interrupt
// is not used in this example.  This is useful for debug purposes.
// The shell ISR routines are found in DSP2834x_DefaultIsr.c.
// This function is found in DSP2834x_PieVect.c.
   InitPieVectTable();

// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP2834x_InitPeripherals.c
// InitPeripherals(); // Not required for this example

// Step 5. User specific code, enable interrupts:

    MessageReceivedCount = 0;
    ErrorCount = 0;
    PassCount = 0;

	InitECana(); // Initialize eCAN-A module

    // Mailboxs can be written to 16-bits or 32-bits at a time
    // Write to the MSGID field of TRANSMIT mailboxes MBOX0 - 15
    ECanaMboxes.MBOX0.MSGID.all = 0x9555AAA0;
    ECanaMboxes.MBOX1.MSGID.all = 0x9555AAA1;
    ECanaMboxes.MBOX2.MSGID.all = 0x9555AAA2;
    ECanaMboxes.MBOX3.MSGID.all = 0x9555AAA3;
    ECanaMboxes.MBOX4.MSGID.all = 0x9555AAA4;
    ECanaMboxes.MBOX5.MSGID.all = 0x9555AAA5;
    ECanaMboxes.MBOX6.MSGID.all = 0x9555AAA6;
    ECanaMboxes.MBOX7.MSGID.all = 0x9555AAA7;
    ECanaMboxes.MBOX8.MSGID.all = 0x9555AAA8;
    ECanaMboxes.MBOX9.MSGID.all = 0x9555AAA9;
    ECanaMboxes.MBOX10.MSGID.all = 0x9555AAAA;
    ECanaMboxes.MBOX11.MSGID.all = 0x9555AAAB;
    ECanaMboxes.MBOX12.MSGID.all = 0x9555AAAC;
    ECanaMboxes.MBOX13.MSGID.all = 0x9555AAAD;
    ECanaMboxes.MBOX14.MSGID.all = 0x9555AAAE;
    ECanaMboxes.MBOX15.MSGID.all = 0x9555AAAF;

    // Write to the MSGID field of RECEIVE mailboxes MBOX16 - 31
    ECanaMboxes.MBOX16.MSGID.all = 0x9555AAA0;
    ECanaMboxes.MBOX17.MSGID.all = 0x9555AAA1;
    ECanaMboxes.MBOX18.MSGID.all = 0x9555AAA2;
    ECanaMboxes.MBOX19.MSGID.all = 0x9555AAA3;
    ECanaMboxes.MBOX20.MSGID.all = 0x9555AAA4;
    ECanaMboxes.MBOX21.MSGID.all = 0x9555AAA5;
    ECanaMboxes.MBOX22.MSGID.all = 0x9555AAA6;
    ECanaMboxes.MBOX23.MSGID.all = 0x9555AAA7;
    ECanaMboxes.MBOX24.MSGID.all = 0x9555AAA8;
    ECanaMboxes.MBOX25.MSGID.all = 0x9555AAA9;
    ECanaMboxes.MBOX26.MSGID.all = 0x9555AAAA;
    ECanaMboxes.MBOX27.MSGID.all = 0x9555AAAB;
    ECanaMboxes.MBOX28.MSGID.all = 0x9555AAAC;
    ECanaMboxes.MBOX29.MSGID.all = 0x9555AAAD;
    ECanaMboxes.MBOX30.MSGID.all = 0x9555AAAE;
    ECanaMboxes.MBOX31.MSGID.all = 0x9555AAAF;

    // Configure Mailboxes 0-15 as Tx, 16-31 as Rx
    // Since this write is to the entire register (instead of a bit
    // field) a shadow register is not required.
    ECanaRegs.CANMD.all = 0xFFFF0000;

    // Enable all Mailboxes */
    // Since this write is to the entire register (instead of a bit
    // field) a shadow register is not required.
    ECanaRegs.CANME.all = 0xFFFFFFFF;

    // Specify that 8 bits will be sent/received
    ECanaMboxes.MBOX0.MSGCTRL.bit.DLC = 8;
    ECanaMboxes.MBOX1.MSGCTRL.bit.DLC = 8;
    ECanaMboxes.MBOX2.MSGCTRL.bit.DLC = 8;
    ECanaMboxes.MBOX3.MSGCTRL.bit.DLC = 8;
    ECanaMboxes.MBOX4.MSGCTRL.bit.DLC = 8;
    ECanaMboxes.MBOX5.MSGCTRL.bit.DLC = 8;
    ECanaMboxes.MBOX6.MSGCTRL.bit.DLC = 8;
    ECanaMboxes.MBOX7.MSGCTRL.bit.DLC = 8;
    ECanaMboxes.MBOX8.MSGCTRL.bit.DLC = 8;
    ECanaMboxes.MBOX9.MSGCTRL.bit.DLC = 8;
    ECanaMboxes.MBOX10.MSGCTRL.bit.DLC = 8;
    ECanaMboxes.MBOX11.MSGCTRL.bit.DLC = 8;
    ECanaMboxes.MBOX12.MSGCTRL.bit.DLC = 8;
    ECanaMboxes.MBOX13.MSGCTRL.bit.DLC = 8;
    ECanaMboxes.MBOX14.MSGCTRL.bit.DLC = 8;
    ECanaMboxes.MBOX15.MSGCTRL.bit.DLC = 8;


    // Write to the mailbox RAM field of MBOX0 - 15
    ECanaMboxes.MBOX0.MDL.all = 0x9555AAA0;
    ECanaMboxes.MBOX0.MDH.all = 0x89ABCDEF;

    ECanaMboxes.MBOX1.MDL.all = 0x9555AAA1;
    ECanaMboxes.MBOX1.MDH.all = 0x89ABCDEF;

    ECanaMboxes.MBOX2.MDL.all = 0x9555AAA2;
    ECanaMboxes.MBOX2.MDH.all = 0x89ABCDEF;

    ECanaMboxes.MBOX3.MDL.all = 0x9555AAA3;
    ECanaMboxes.MBOX3.MDH.all = 0x89ABCDEF;

    ECanaMboxes.MBOX4.MDL.all = 0x9555AAA4;
    ECanaMboxes.MBOX4.MDH.all = 0x89ABCDEF;

    ECanaMboxes.MBOX5.MDL.all = 0x9555AAA5;
    ECanaMboxes.MBOX5.MDH.all = 0x89ABCDEF;

    ECanaMboxes.MBOX6.MDL.all = 0x9555AAA6;
    ECanaMboxes.MBOX6.MDH.all = 0x89ABCDEF;

    ECanaMboxes.MBOX7.MDL.all = 0x9555AAA7;
    ECanaMboxes.MBOX7.MDH.all = 0x89ABCDEF;

    ECanaMboxes.MBOX8.MDL.all = 0x9555AAA8;
    ECanaMboxes.MBOX8.MDH.all = 0x89ABCDEF;

    ECanaMboxes.MBOX9.MDL.all = 0x9555AAA9;
    ECanaMboxes.MBOX9.MDH.all = 0x89ABCDEF;

    ECanaMboxes.MBOX10.MDL.all = 0x9555AAAA;
    ECanaMboxes.MBOX10.MDH.all = 0x89ABCDEF;

    ECanaMboxes.MBOX11.MDL.all = 0x9555AAAB;
    ECanaMboxes.MBOX11.MDH.all = 0x89ABCDEF;

    ECanaMboxes.MBOX12.MDL.all = 0x9555AAAC;
    ECanaMboxes.MBOX12.MDH.all = 0x89ABCDEF;

    ECanaMboxes.MBOX13.MDL.all = 0x9555AAAD;
    ECanaMboxes.MBOX13.MDH.all = 0x89ABCDEF;

    ECanaMboxes.MBOX14.MDL.all = 0x9555AAAE;
    ECanaMboxes.MBOX14.MDH.all = 0x89ABCDEF;

    ECanaMboxes.MBOX15.MDL.all = 0x9555AAAF;
    ECanaMboxes.MBOX15.MDH.all = 0x89ABCDEF;

    // Since this write is to the entire register (instead of a bit
    // field) a shadow register is not required.
    EALLOW;
    ECanaRegs.CANMIM.all = 0xFFFFFFFF;

    // Configure the eCAN for self test mode
    // Enable the enhanced features of the eCAN.
    EALLOW;
    ECanaShadow.CANMC.all = ECanaRegs.CANMC.all;
    ECanaShadow.CANMC.bit.STM = 1;    // Configure CAN for self-test mode
    ECanaRegs.CANMC.all = ECanaShadow.CANMC.all;
    EDIS;

    // Begin transmitting
    for(;;)
    {

       ECanaRegs.CANTRS.all = 0x0000FFFF;  // Set TRS for all transmit mailboxes
       while(ECanaRegs.CANTA.all != 0x0000FFFF ) {}  // Wait for all TAn bits to be set..
       ECanaRegs.CANTA.all = 0x0000FFFF;   // Clear all TAn
       MessageReceivedCount++;

       //Read from Receive mailboxes and begin checking for data */
       for(j=0; j<16; j++)         // Read & check 16 mailboxes
       {
          mailbox_read(j);         // This func reads the indicated mailbox data
          mailbox_check(TestMbox1,TestMbox2,TestMbox3); // Checks the received data
       }
    }
}

// This function reads out the contents of the indicated
// by the Mailbox number (MBXnbr).
void mailbox_read(int16 MBXnbr)
{
   volatile struct MBOX *Mailbox;
   Mailbox = &ECanaMboxes.MBOX0 + MBXnbr;
   TestMbox1 = Mailbox->MDL.all; // = 0x9555AAAn (n is the MBX number)
   TestMbox2 = Mailbox->MDH.all; // = 0x89ABCDEF (a constant)
   TestMbox3 = Mailbox->MSGID.all;// = 0x9555AAAn (n is the MBX number)

} // MSGID of a rcv MBX is transmitted as the MDL data.


void mailbox_check(int32 T1, int32 T2, int32 T3)
{
    if((T1 != T3) || ( T2 != 0x89ABCDEF))
    {
       ErrorCount++;
    }
    else
    {
       PassCount++;
    }
}


//===========================================================================
// No more.
//===========================================================================