eCAN Bootload İssue

Hello,

I try to bootload F28335 through eCAN and load my application code into flash of F28335 and I found  an example code for this purpose . But, I could not receive data through eCAN by polling method.

CPU waits on this line :

while(ECanaRegs.CANRMP.all == 0) { }

Function that receives data through CAN is :

Uint16 CAN_GetWordData()
{
Uint16 wordData;
Uint16 byteData;

wordData = 0x0000;
byteData = 0x0000;

// Fetch the LSB
while(ECanaRegs.CANRMP.all == 0) { }
wordData = (Uint16) ECanaMboxes.MBOX1.MDL.byte.BYTE0; // LS byte

// Fetch the MSB

byteData = (Uint16)ECanaMboxes.MBOX1.MDL.byte.BYTE1; // MS byte

// form the wordData from the MSB:LSB
wordData |= (byteData << 8);

/* Clear all RMPn bits */

ECanaRegs.CANRMP.all = 0xFFFFFFFF;

return wordData;

}

CAN initialization function :

void CAN_Init()
{

/* Create a shadow register structure for the CAN control registers. This is
needed, since only 32-bit access is allowed to these registers. 16-bit access
to these registers could potentially corrupt the register contents or return
false data. This is especially true while writing to/reading from a bit
(or group of bits) among bits 16 - 31 */

struct ECAN_REGS ECanaShadow;

EALLOW;

/* Enable CAN clock */

SysCtrlRegs.PCLKCR0.bit.ECANAENCLK=1;

/* Configure eCAN-A pins using GPIO regs*/

GpioCtrlRegs.GPAMUX2.bit.GPIO30 = 1; // GPIO30 is CANRXA
GpioCtrlRegs.GPAMUX2.bit.GPIO31 = 1; // GPIO31 is CANTXA

/* Enable internal pullups for the CAN pins */

GpioCtrlRegs.GPAPUD.bit.GPIO30 = 0;
GpioCtrlRegs.GPAPUD.bit.GPIO31 = 0;

/* Asynch Qual */

GpioCtrlRegs.GPAQSEL2.bit.GPIO30 = 3;

/* Configure eCAN RX and TX pins for CAN operation using eCAN regs*/

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;

/* Initialize all bits of 'Message Control Register' to zero */
// Some bits of MSGCTRL register come up in an unknown state. For proper operation,
// all bits (including reserved bits) of MSGCTRL must be initialized to zero

ECanaMboxes.MBOX1.MSGCTRL.all = 0x00000000;

/* Clear all RMPn, GIFn bits */
// RMPn, GIFn bits are zero upon reset and are cleared again as a precaution.

ECanaRegs.CANRMP.all = 0xFFFFFFFF;

/* Clear all interrupt flag bits */

ECanaRegs.CANGIF0.all = 0xFFFFFFFF;
ECanaRegs.CANGIF1.all = 0xFFFFFFFF;

/* Configure bit timing parameters for eCANA*/

ECanaShadow.CANMC.all = ECanaRegs.CANMC.all;
ECanaShadow.CANMC.bit.CCR = 1 ; // Set CCR = 1
ECanaRegs.CANMC.all = ECanaShadow.CANMC.all;

ECanaShadow.CANES.all = ECanaRegs.CANES.all;

do
{
ECanaShadow.CANES.all = ECanaRegs.CANES.all;
} while(ECanaShadow.CANES.bit.CCE != 1 ); // Wait for CCE bit to be set..

ECanaShadow.CANBTC.all = 0;

ECanaShadow.CANBTC.bit.BRPREG = 0;
ECanaShadow.CANBTC.bit.TSEG2REG = 2;
ECanaShadow.CANBTC.bit.TSEG1REG = 10;

ECanaShadow.CANBTC.bit.SAM = 1;
ECanaRegs.CANBTC.all = ECanaShadow.CANBTC.all;

ECanaShadow.CANMC.all = ECanaRegs.CANMC.all;
ECanaShadow.CANMC.bit.CCR = 0 ; // Set CCR = 0
ECanaRegs.CANMC.all = ECanaShadow.CANMC.all;

ECanaShadow.CANES.all = ECanaRegs.CANES.all;

do
{
ECanaShadow.CANES.all = ECanaRegs.CANES.all;
} while(ECanaShadow.CANES.bit.CCE != 0 ); // Wait for CCE bit to be cleared..

/* Disable all Mailboxes */

ECanaRegs.CANME.all = 0; // Required before writing the MSGIDs

/* Assign MSGID to MBOX1 */

ECanaMboxes.MBOX1.MSGID.all = 0x00040000; // Standard ID of 1, Acceptance mask disabled

/* Configure MBOX1 to be a receive MBOX */

ECanaRegs.CANMD.all = 0x0002;

/* Enable MBOX1 */

ECanaRegs.CANME.all = 0x0002;

EDIS;

return;
}

so What is my fault ? Any help will be appreciated.

Thanks in advance

Sertac