ctucan_insert_frame(9)

💅 ctucan_insert_frame — the Kernel API Manual moment

okay so bestie, this one's from the Kernel API Manual and it's literally called ctucan_insert_frame — say that three times fast, i dare you. it does exactly what it says on the tin: inserts a frame into the TXT buffer. one job. iconic.

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✨ NAME ✨

ctucan_insert_frame — inserts frame to TXT buffer 🎀

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🌸 SYNOPSIS 🌸

bool ctucan_insert_frame (struct ctucan_priv *priv , const struct
       canfd_frame *cf , u8 buf , bool isfdf );

like yes she's a bool, she returns receipts, we'll get to that 💅

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🦋 ARGUMENTS 🦋

• priv — pointer to private data. the private data. the main character's inner world, honestly.
• cf — pointer to the CAN frame to be inserted. this is the passenger, we're giving her a seat.
• buf — TXT Buffer index to which frame is inserted (0-based). zero-based indexing, because we are programmers and we suffer 🫶
• isfdf — True = CAN FD Frame, False = CAN 2.0 Frame. pick your fighter, ngl.

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💀 RETURN 💀

• True — Frame inserted successfully. slay. ate. no crumbs.
• False — Frame was not inserted due to one of:
  1. TXT Buffer is not writable (it is in wrong state) 😭
  2. Invalid TXT buffer index 🙈
  3. Invalid frame length 💀

so like, a False back does not mean "something vaguely went wrong", bestie — it means one of literally exactly those three things. three (3) reasons. not two, not four. do not invent a fourth, i am begging.

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👑 SEE ALSO 👑

the kernel file, if you wanna go touch grass and read the source:

./drivers/net/can/ctucanfd/ctucanfd_base.c

and the whole friend group, in this exact order, no cap:

• ctucan_state_to_str(9)
• ctucan_reset(9)
• ctucan_set_btr(9)
• ctucan_set_bittiming(9)
• ctucan_set_data_bittiming(9)
• ctucan_set_secondary_sample_point(9)
• ctucan_set_mode(9)
• ctucan_chip_start(9)
• ctucan_do_set_mode(9)
• ctucan_get_tx_status(9)
• ctucan_is_txt_buf_writable(9)
• ctucan_give_txtb_cmd(9)
• ctucan_start_xmit(9)
• ctucan_read_rx_frame(9)
• ctucan_rx(9)
• ctucan_read_fault_state(9)
• ctucan_get_rec_tec(9)
• ctucan_err_interrupt(9)
• ctucan_rx_poll(9)
• ctucan_rotate_txb_prio(9)
• ctucan_tx_interrupt(9)
• ctucan_interrupt(9)
• ctucan_chip_stop(9)
• ctucan_open(9)
• ctucan_close(9)
• ctucan_get_berr_counter(9)

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and that's the whole page, bestie 💖 — brought to you by the fine folks over at ./drivers/net/can/ctucanfd, stamped October 2026. go forth and insert your frames responsibly. mwah 🧚✨