What can cause TWAI TWAI_ALERT_TX_FAILED
Posted: Wed Aug 24, 2022 1:48 pm
Using ESP32S2 and esp-idf v4.4.1.
Under heavily loaded CAN bus, sometimes it happens that the TWAI driver reports TWAI_ALERT_TX_FAILED and in this case, the transmit message is lost. What can cause this error? I noticed from ESP32-S2 TRM (V1.0) that this alert is fired when TWAI_STATUS_REG.TWAI_TX_COMPLETE is not set when the transmit interrupt occurs. However, the technical manual does not explain why TWAI_TX_COMPLETE may not be set.
How can I avoid that transmit messages can get lost?
Under heavily loaded CAN bus, sometimes it happens that the TWAI driver reports TWAI_ALERT_TX_FAILED and in this case, the transmit message is lost. What can cause this error? I noticed from ESP32-S2 TRM (V1.0) that this alert is fired when TWAI_STATUS_REG.TWAI_TX_COMPLETE is not set when the transmit interrupt occurs. However, the technical manual does not explain why TWAI_TX_COMPLETE may not be set.
How can I avoid that transmit messages can get lost?