experiment_m_9.c
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上传日期:2014-10-27
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- //###########################################################################
- //
- // FILE: experiment_m_9.c
- //
- // TITLE: DSP281x eCAN Back-to-back transmission and reception in
- // SELF-TEST mode
- //
- //###########################################################################
- #include "DSP281x_Device.h" // DSP281x Headerfile Include File
- #include "DSP281x_Examples.h" // DSP281x 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);
- void Gpio_select(void);
- void InitSystem(void);
- void InitCan(void);
- // Global variable for this example
- Uint32 ErrorCount;
- 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
- InitSystem();
- // Step 2. Initalize GPIO:
- // This example function is found in the DSP281x_Gpio.c file and
- // illustrates how to set the GPIO to it's default state.
- Gpio_select();
- GpioDataRegs.GPBDAT.all = 0xFFFF; // Switch LED's off
- // 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 DSP281x_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 DSP281x_DefaultIsr.c.
- // This function is found in DSP281x_PieVect.c.
- InitPieVectTable();
- // Step 4. Initialize all the Device Peripherals:
- // This function is found in DSP281x_InitPeripherals.c
- // InitPeripherals(); // Not required for this example
- // Step 5. User specific code, enable interrupts:
- MessageReceivedCount = 0;
- ErrorCount = 0;
- // eCAN control registers require 32-bit access.
- // If you want to write to a single bit, the compiler may break this
- // access into a 16-bit access. One solution, that is presented here,
- // is to use a shadow register to force the 32-bit access.
- // Read the entire register into a shadow register. This access
- // will be 32-bits. Change the desired bit and copy the value back
- // to the eCAN register with a 32-bit write.
- // Configure the eCAN RX and TX pins for eCAN transmissions
- EALLOW;
- ECanaShadow.CANTIOC.all = ECanaRegs.CANTIOC.all;
- ECanaShadow.CANTIOC.bit.TXFUNC = 1;
- ECanaRegs.CANTIOC.all = ECanaShadow.CANTIOC.all;
- ECanaShadow.CANRIOC.all = ECanaRegs.CANRIOC.all;
- ECanaShadow.CANRIOC.bit.RXFUNC = 1;
- ECanaRegs.CANRIOC.all = ECanaShadow.CANRIOC.all;
- EDIS;
- // Disable all Mailboxes
- // Since this write is to the entire register (instead of a bit
- // field) a shadow register is not required.
- ECanaRegs.CANME.all = 0;
- // 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;
- // No remote frame is requested
- // Since RTR bit is undefined upon reset,
- // it must be initialized to the proper value
- ECanaMboxes.MBOX0.MSGCTRL.bit.RTR = 0;
- ECanaMboxes.MBOX1.MSGCTRL.bit.RTR = 0;
- ECanaMboxes.MBOX2.MSGCTRL.bit.RTR = 0;
- ECanaMboxes.MBOX3.MSGCTRL.bit.RTR = 0;
- ECanaMboxes.MBOX4.MSGCTRL.bit.RTR = 0;
- ECanaMboxes.MBOX5.MSGCTRL.bit.RTR = 0;
- ECanaMboxes.MBOX6.MSGCTRL.bit.RTR = 0;
- ECanaMboxes.MBOX7.MSGCTRL.bit.RTR = 0;
- ECanaMboxes.MBOX8.MSGCTRL.bit.RTR = 0;
- ECanaMboxes.MBOX9.MSGCTRL.bit.RTR = 0;
- ECanaMboxes.MBOX10.MSGCTRL.bit.RTR = 0;
- ECanaMboxes.MBOX11.MSGCTRL.bit.RTR = 0;
- ECanaMboxes.MBOX12.MSGCTRL.bit.RTR = 0;
- ECanaMboxes.MBOX13.MSGCTRL.bit.RTR = 0;
- ECanaMboxes.MBOX14.MSGCTRL.bit.RTR = 0;
- ECanaMboxes.MBOX15.MSGCTRL.bit.RTR = 0;
- // 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;
- // Request permission to change the configuration registers
- ECanaShadow.CANMC.all = ECanaRegs.CANMC.all;
- ECanaShadow.CANMC.bit.CCR = 1;
- ECanaRegs.CANMC.all = ECanaShadow.CANMC.all;
- EDIS;
- // Wait until the CPU has been granted permission to change the
- // configuration registers
- // Wait for CCE bit to be set..
- do
- {
- ECanaShadow.CANES.all = ECanaRegs.CANES.all;
- } while(ECanaShadow.CANES.bit.CCE != 1 );
- // Configure the eCAN timing
- EALLOW;
- ECanaShadow.CANBTC.all = ECanaRegs.CANBTC.all;
- ECanaShadow.CANBTC.bit.BRPREG = 9; // (BRPREG + 1) = 10 feeds a 15 MHz CAN clock
- ECanaShadow.CANBTC.bit.TSEG2REG = 5 ;// to the CAN module. (150 / 10 = 15)
- ECanaShadow.CANBTC.bit.TSEG1REG = 7; // Bit time = 15
- ECanaRegs.CANBTC.all = ECanaShadow.CANBTC.all;
- ECanaShadow.CANMC.all = ECanaRegs.CANMC.all;
- ECanaShadow.CANMC.bit.CCR = 0;
- ECanaRegs.CANMC.all = ECanaShadow.CANMC.all;
- EDIS;
- // Wait until the CPU no longer has permission to change the
- // configuration registers
- do
- {
- ECanaShadow.CANES.all = ECanaRegs.CANES.all;
- } while(ECanaShadow.CANES.bit.CCE != 0 );
- // 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
- ECanaShadow.CANMC.bit.SCB = 1; // eCAN mode (reqd to access 32 mailboxes)
- ECanaRegs.CANMC.all = ECanaShadow.CANMC.all;
- EDIS;
- // Begin transmitting
- while(1)
- {
- 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
- }
- }
- }
- void Gpio_select(void)
- {
- EALLOW;
- GpioMuxRegs.GPAMUX.all = 0x0; // all GPIO port Pin's to I/O
- GpioMuxRegs.GPBMUX.all = 0x0;
- GpioMuxRegs.GPDMUX.all = 0x0;
- GpioMuxRegs.GPFMUX.all = 0x0;
- GpioMuxRegs.GPEMUX.all = 0x0;
- GpioMuxRegs.GPGMUX.all = 0x0;
- GpioMuxRegs.GPFMUX.bit.CANTXA_GPIOF6 = 1; // Enable CAN - lines
- GpioMuxRegs.GPFMUX.bit.CANRXA_GPIOF7 = 1;
- GpioMuxRegs.GPADIR.all = 0x0; // GPIO PORT as input
- GpioMuxRegs.GPBDIR.all = 0x00FF;// GPIO Port B15-B8 input , B7-B0 output
- GpioMuxRegs.GPDDIR.all = 0x0; // GPIO PORT as input
- GpioMuxRegs.GPEDIR.all = 0x0; // GPIO PORT as input
- GpioMuxRegs.GPFDIR.all = 0x0; // GPIO PORT as input
- GpioMuxRegs.GPGDIR.all = 0x0; // GPIO PORT as input
- GpioMuxRegs.GPAQUAL.all = 0x0; // Set GPIO input qualifier values to zero
- GpioMuxRegs.GPBQUAL.all = 0x0;
- GpioMuxRegs.GPDQUAL.all = 0x0;
- GpioMuxRegs.GPEQUAL.all = 0x0;
- EDIS;
- }
- void InitSystem(void)
- {
- EALLOW; // Enable EALLOW protected register access
- SysCtrlRegs.WDCR= 0x00E8; // Setup the watchdog
- // 0x00E8 to disable the Watchdog , Prescaler = 1
- // 0x00AF to NOT disable the Watchdog, Prescaler = 64
- SysCtrlRegs.SCSR = 0; // Watchdog generates a RESET
- SysCtrlRegs.PLLCR.bit.DIV = 10; // Setup the Clock PLL to multiply by 5
- SysCtrlRegs.HISPCP.all = 0x1; // Setup Highspeed Clock Prescaler to divide by 2
- SysCtrlRegs.LOSPCP.all = 0x2; // Setup Lowspeed CLock Prescaler to divide by 4
- // Peripheral clock enables set for the selected peripherals.
- SysCtrlRegs.PCLKCR.bit.EVAENCLK=0;
- SysCtrlRegs.PCLKCR.bit.EVBENCLK=0;
- SysCtrlRegs.PCLKCR.bit.SCIAENCLK=0;
- SysCtrlRegs.PCLKCR.bit.SCIBENCLK=0;
- SysCtrlRegs.PCLKCR.bit.MCBSPENCLK=0;
- SysCtrlRegs.PCLKCR.bit.SPIENCLK=0;
- SysCtrlRegs.PCLKCR.bit.ECANENCLK=1;
- SysCtrlRegs.PCLKCR.bit.ADCENCLK=0;
- EDIS;
- }
- // 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++;
- }
- }
- //===========================================================================
- // End
- //===========================================================================