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Receive may freeze if CAN saturated

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If either the CANBUS is saturated or the MCU is busy for some time, both RX buffers of the MCP2515 may be in use. If the MCU does not catch up in processing the incoming messages, the second message received just adds another reason for the IRQ.
Thus reading a single message does not clear the IRQ conditon of the MCP2515 leading to a permanent lock up of the receiver program.

Signed-off-by: Ralf Edmund Stranzenbach <ralf@reswi.de>
This commit is contained in:
Ralf Edmund Stranzenbach
2014-10-14 23:53:17 +02:00
parent 0c869d8ae3
commit 0a791f6d4b
1 changed files with 19 additions and 12 deletions
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examples/receive_interrupt/receive_interrupt.ino
+19 -12
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@@ -41,20 +41,27 @@ void MCP2515_ISR()
void loop()
{
if(Flag_Recv) // check if get data
{
if(Flag_Recv) { // check if get data
Flag_Recv = 0; // clear flag
CAN.readMsgBuf(&len, buf); // read data, len: data length, buf: data buf
for(int i = 0; i<len; i++) // print the data
{
Serial.print(buf[i]);Serial.print("\t");
}
Serial.println();
}
Flag_Recv = 0; // clear flag
// iterate over all pending messages
// If either the bus is saturated or the MCU is busy,
// both RX buffers may be in use and reading a single
// message does not clear the IRQ conditon.
while (CAN_MSGAVAIL == CAN.checkReceive()) {
// read data, len: data length, buf: data buf
CAN.readMsgBuf(&len, buf);
// print the data
for(int i = 0; i<len; i++) {
Serial.print(buf[i]);Serial.print("\t");
}
Serial.println();
}
}
}
/*********************************************************************************************************
END FILE
*********************************************************************************************************/
*********************************************************************************************************/