Tool/software: Code Composer Studio
Hello,
I want to change the control suite eCAN example of f28335 to transmit message continuously over a CAN bus . I have modified the program as mentioned below. But I am not seeing any changes on the CAN pins(i.e. eCANA 31 and 30).
Basically I want a program which will send massage over CAN and receive some massages for the same.
One more query if we are not using any CAN trans-reciver as of now with controller, Is it possible to see the signal change from CAN pins of the controller by Oscilloscope.(In transmitting mode)
Regards,
Vishal
Script as follows:
#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
Uint32 PassCount=0;
void main(void)
{
// 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 DSP2833x_SysCtrl.c file.
InitSysCtrl();
// Step 2. Initialize GPIO:
// This example function is found in the DSP2833x_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 DSP2833x_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 DSP2833x_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 DSP2833x_DefaultIsr.c.
// This function is found in DSP2833x_PieVect.c.
InitPieVectTable();
// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP2833x_InitPeripherals.c
// InitPeripherals(); // Not required for this example
// Step 5. User specific code, enable interrupts:
InitECana(); // Initialize eCAN-A module
// Mailboxes 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;
// Write to the MSGID field of RECEIVE mailboxes MBOX16 - 31
// 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;
// Write to the mailbox RAM field of MBOX0 - 15
ECanaMboxes.MBOX0.MDL.all = 0x9555AAA0;
ECanaMboxes.MBOX0.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 = 0; // Configure CAN for self-test mode
ECanaRegs.CANMC.all = ECanaShadow.CANMC.all;
EDIS;
// Begin transmitting
for(;;)
{
PassCount++;
ECanaRegs.CANTRS.all = 0x00000001; // Set TRS for all transmit mailboxes
while(ECanaRegs.CANTA.all != 0x00000001 ) {} // Wait for all TAn bits to be set..
ECanaRegs.CANTA.all = 0x00000001; // Clear all TAn
//Read from Receive mailboxes and begin checking for data */
}
}
