Espressif ESP32 Technical Reference Manual page 578

21 Two-wire Automotive Interface (TWAI)
31
0 0 0 0 0 0 0
TWAI_TX_REQ Set the bit to 1 to allow the driving nodes start transmission. (WO)
TWAI_ABORT_TX Set the bit to 1 to cancel a pending transmission request. (WO)
TWAI_RELEASE_BUF Set the bit to 1 to release the RX buffer. (WO)
TWAI_CLR_OVERRUN Set the bit to 1 to clear the data overrun status bit. (WO)
TWAI_SELF_RX_REQ Self reception request command. Set the bit to 1 to allow a message be
transmitted and received simultaneously. (WO)
31
0 0 0 0 0 0 0
TWAI_RX_BUF_ST 1: The data in the RX buffer is not empty, with at least one received data packet.
(RO)
TWAI_OVERRUN_ST 1: The RX FIFO is full and data overrun has occurred. (RO)
TWAI_TX_BUF_ST 1: The TX buffer is empty, the CPU may write a message into it. (RO)
TWAI_TX_COMPLETE 1: The TWAI controller has successfully received a packet from the bus. (RO)
TWAI_RX_ST 1: The TWAI Controller is receiving a message from the bus. (RO)
TWAI_TX_ST 1: The TWAI Controller is transmitting a message to the bus. (RO)
TWAI_ERR_ST 1: At least one of the RX/TX error counter has reached or exceeded the value set in
register TWAI_ERR_WARNING_LIMIT_REG. (RO)
TWAI_BUS_OFF_ST 1: In bus-off status, the TWAI Controller is no longer involved in bus activities.
(RO)
Espressif Systems
Register 21.19. TWAI_CMD_REG (0x0004)
0 0 0 0 0 0 0 0
Register 21.20. TWAI_STATUS_REG (0x0008)
0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
578
5 4 3 2 1
0 0 0 0 0 0 0 0
8 7 6 5 4 3 2 1
0 0 0 0 0 1 1 0
ESP32 TRM (Version 5.2)
0
0
Reset
0
0 Reset