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twai_ll_save_reg() function
Saves the current values of the TWAI controller's registers This function saves the current values of the some of the TWAI controller's registers in preparation for a hardware reset of the controller.
Syntax
__attribute__((always_inline))
static inline void twai_ll_save_reg(twai_dev_t *hw,
twai_ll_reg_save_t *reg_save);
Notes
Must be called in reset mode so that config registers become accessible. Some registers are cleared on entering reset mode so must be saved separate from this function.
Related Functions
Found 33 other functions taking a ![]()
twai_dev_s
argument:
Function
Description
Get currently set interrupts Reading the interrupt registers will automatically clear all interrupts except for the Receive Interrupt.
Enter reset mode When in reset mode, the TWAI controller is effectively disconnected from the TWAI bus and will not participate in any bus activates. Reset mode is required in order to write the majority of configuration registers.
Get RX Message Counter
Set operating mode of TWAI controller
Set TX Error Counter
Get all status bits
Exit reset mode When not in reset mode, the TWAI controller will take part in bus activities (e.g., send/receive/acknowledge messages and error frames) depending on the operating mode.
Set RX Error Counter
Set register address mapping to extended mode Extended mode register address mapping consists of more registers and extra features.
Release RX buffer Rotates RX buffer to the next frame in the RX FIFO.
Get RX Error Counter
Get TX Error Counter
Set which interrupts are enabled
Clear Arbitration Lost Capture Register Reading the ALC register rearms the Arbitration Lost Interrupt
Clear Error Code Capture register Reading the ECC register rearms the Bus Error Interrupt
Restores the previous values of the TWAI controller's registers This function restores the previous values of some of the TWAI controller's registers following a hardware reset of the controller.
Set CLKOUT Divider and enable/disable Configure CLKOUT. CLKOUT is a pre-scaled version of APB CLK. Divider can be 1, or any even number from 2 to 14. Set the divider to 0 to disable CLKOUT.
Set single shot TX command Similar to setting TX command, but the TWAI controller will not automatically retry transmission upon an error (e.g., due to an acknowledgement error).
Clear data overrun Clears the data overrun status bit
Set self reception single shot command Similar to setting TX command, but the TWAI controller also simultaneously receive the transmitted frame and is generally used for self testing purposes. The TWAI controller will not ACK the received message, so consider using the NO_ACK operating mode.
Set self reception request command Similar to setting the self reception request, but the TWAI controller will not automatically retry transmission upon an error (e.g., due to and acknowledgement error).
Check if previously TX was successful
Check if in reset mode
Set TX command Setting the TX command will cause the TWAI controller to attempt to transmit the frame stored in the TX buffer. The TX buffer will be occupied (i.e., locked) until TX completes.
Set Error Warning Limit
Set Acceptance Filter
Set bus timing
Copy a formatted TWAI frame into TX buffer for transmission
Copy a received frame from the RX buffer for parsing
Aborts TX Frames awaiting TX will be aborted. Frames already being TX are not aborted. Transmission Complete Status bit is automatically set to 1. Similar to setting TX command, but the TWAI controller will not automatically retry transmission upon an error (e.g., due to acknowledge error).
Check if RX FIFO overrun status bit is set
Get Error Warning Limit