Harshal Pawar

Error while re-transmitting data via CAN between two MC9S12XEP100

Discussion created by Harshal Pawar on Jan 30, 2019
Latest reply on Jan 31, 2019 by Harshal Pawar

I am working on establishing communication between two MC9S12XEP100 controllers using CAN MAX3050ASA+ interface.

Case 1:

The data is transmitted on key press event from First board and received using interrupt at second board and it also displayed on GLCD display (Display is at Secondary side)

Its working fine.

Case 2:

When I updated the same code for receiving data at second board and re-transmitting it to first board neither values are updating on display nor receiving at Tx side (i.e. first board).

Code Workflow for Case 1:

At Tx:

1. In infinite loop check for key press event

2. If Yes, the Check for empty buffer

3. Select empty buffer

4. Create message

5. Make Buffer Ready

6. Check transmission status

At Rx:

1. In receive ISR, get the data transmitted from first board & display it on GLCD


Code Workflow for Case 2:

At Tx:

Step 1 to 6 are same

7. Receive ISR for the re-transmitted data from second borad

At Rx:

1. In receive ISR get the data transmitted from first board & display it on GLCD

2. Re-transmit the same data as an acknoledgement as per following steps:

3. Check for empty buffer

4. Select empty buffer

5. Create message

6. Make Buffer Ready

7. Check transmission status