Other Parts Discussed in Thread: CONTROLSUITE
Hello,
I'm trying to configure two TMS320f28035 for eCAN communication.(MCU0 for CANTX and MCU1 for CANRX)
I used the datasheet of the DSP and loopback example in controlsuit to configure the communication, step by step as written at the end of the document.
with the watch window, when i transmitts single byte data from MCU0 then i am receiving correct data on MCU1. But when i only power off the MCU0 then MDL and MDH register in MCU1 showing old data that was i received in previous receiption . That's why i am continuously seeing data in MCU1 MDL and MDH register even when the MCU0 is not sending. that's why i want to clear both MDL and MDH register on MCU1 before the next receiving byte.so how can i do it ? that means when i power off the only MCU0 then i don't want to receive previous data.
Here is my code.
Ref:C:\ti\controlSUITE\device_support\f2803x\v130\DSP2803x_examples_ccsv5\ecan_back2back
MCU0 Transmitter side code:
void main(void)
{
Uint16 j;
struct ECAN_REGS ECanaShadow;
InitSysCtrl();
InitECanGpio();
DINT;
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
MessageReceivedCount = 0;
ErrorCount = 0;
PassCount = 0;
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 mailboxe MBOX0
ECanaMboxes.MBOX0.MSGID.all = 0x9555AAA0;
// Configure Mailboxes 0 as Tx, 16 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 = 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++;
Delay_us(900000)
}
}
/*********************************************************/
/*********************************************************/
MCU1 Receiver side code:
void main(void)
{
Uint16 j;
struct ECAN_REGS ECanaShadow;
InitSysCtrl();
InitECanGpio();
DINT;
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
MessageReceivedCount = 0;
ErrorCount = 0;
PassCount = 0;
InitECana(); // Initialize eCAN-A module
// Write to the MSGID field of RECEIVE mailboxe MBOX16
ECanaMboxes.MBOX16.MSGID.all = 0x9555AAA0;
// Configure Mailboxes 0 as Tx, 16 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;
// 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 receiving
for(;;)
{
//Read from Receive mailboxes and begin checking for data */
for(j=16; j<17; j++) // Read & check 16 mailboxes
{
mailbox_read(j); // This func reads the indicated mailbox data
mailbox_check(TestMbox1,TestMbox2,TestMbox3); // Checks the received data
}
Delay_us(900000) ;
}
}
// 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++;
}
}
Thanks.
