#include <libopencm3/stm32/fdcan.h>
#include <libopencm3/stm32/rcc.h>
#include <stddef.h>

Include dependency graph for fdcan_common.c:

Functions
int	fdcan_cccr_init_cfg (uint32_t canport, bool set, uint32_t timeout)
	Routine implementing FDCAN_CCCR's INIT bit manipulation. More...

static int	fdcan_get_free_txbuf (uint32_t canport)
	Return ID of next free Tx buffer. More...

static void	fdcan_get_fill_rxfifo (uint32_t canport, uint8_t fifo_id, unsigned get_index, unsigned pending_frames)
	Returns fill state and next available get index from receive FIFO. More...

struct fdcan_standard_filter *	fdcan_get_flssa_addr (uint32_t canport)
	Returns standard filter start address in message RAM. More...

struct fdcan_extended_filter *	fdcan_get_flesa_addr (uint32_t canport)
	Returns extended filter start address in message RAM. More...

struct fdcan_rx_fifo_element *	fdcan_get_rxfifo_addr (uint32_t canport, unsigned fifo_id, unsigned element_id)
	Returns a pointer to an RX FIFO element in message RAM. More...

struct fdcan_tx_event_element *	fdcan_get_txevt_addr (uint32_t canport)
	Returns transmit event start address in message RAM. More...

struct fdcan_tx_buffer_element *	fdcan_get_txbuf_addr (uint32_t canport, unsigned element_id)
	Returns a pointer to an TX FIFO element in message RAM. More...

uint32_t	fdcan_length_to_dlc (uint8_t length)
	Converts frame length to DLC value. More...

uint8_t	fdcan_dlc_to_length (uint32_t dlc)
	Converts DLC value into frame payload length. More...


int	fdcan_init (uint32_t canport, uint32_t timeout)
	Put FDCAN block into INIT mode for setup. More...

void	fdcan_set_can (uint32_t canport, bool auto_retry_disable, bool rx_fifo_locked, bool tx_queue_mode, bool silent, uint32_t n_sjw, uint32_t n_ts1, uint32_t n_ts2, uint32_t n_br_presc)
	Set essential FDCAN block parameters for plain CAN operation. More...

void	fdcan_set_fdcan (uint32_t canport, bool brs_enable, bool fd_op_enable, uint32_t f_sjw, uint32_t f_ts1, uint32_t f_ts2, uint32_t f_br_presc)
	Set FDCAN block parameters for FDCAN transmission. More...

void	fdcan_set_test (uint32_t canport, bool testing, bool loopback)
	Set FDCAN block testing features. More...

int	fdcan_get_init_state (uint32_t canport)
	Return current FDCAN block operation state. More...

void	fdcan_set_std_filter (uint32_t canport, uint32_t nr, uint8_t id_list_mode, uint32_t id1, uint32_t id2, uint8_t action)
	Configure filter rule for standard ID frames. More...

void	fdcan_set_ext_filter (uint32_t canport, uint32_t nr, uint8_t id_list_mode, uint32_t id1, uint32_t id2, uint8_t action)
	Configure filter rule for extended ID frames. More...

int	fdcan_transmit (uint32_t canport, uint32_t id, bool ext, bool rtr, bool fdcan_fmt, bool btr_switch, uint8_t length, const uint8_t *data)
	Transmit Message using FDCAN. More...

int	fdcan_receive (uint32_t canport, uint8_t fifo_id, bool release, uint32_t id, bool ext, bool rtr, uint8_t fmi, uint8_t length, uint8_t data, uint16_t *timestamp)
	Receive Message from FDCAN FIFO. More...

void	fdcan_release_fifo (uint32_t canport, uint8_t fifo_id)
	Release receive oldest FIFO entry. More...

void	fdcan_enable_irq (uint32_t canport, uint32_t irq)
	Enable IRQ from FDCAN block. More...

void	fdcan_disable_irq (uint32_t canport, uint32_t irq)
	Disable IRQ from FDCAN block. More...

bool	fdcan_available_tx (uint32_t canport)
	Check if there is free transmit buffer. More...

bool	fdcan_available_rx (uint32_t canport, uint8_t fifo)
	Tell if there is message waiting in receive FIFO. More...

Function Documentation

◆ fdcan_cccr_init_cfg()

int fdcan_cccr_init_cfg	(	uint32_t	canport,
		bool	set,
		uint32_t	timeout
	)

Routine implementing FDCAN_CCCR's INIT bit manipulation.

This routine will change INIT bit and wait for it to actually change its value. If change won't happen before timeout, error is signalized. If INIT bit already has value which should be set, this function will return immediately.

Parameters

[in]	canport	FDCAN block base address. See FDCAN block base addresses.
[in]	set	new value of INIT, true means set
[in]	timeout	Amount of busyloop cycles, function will wait for FDCAN to switch it's state. If set to 0, then function returns immediately.

Returns: FDCAN_E_OK on success, FDCAN_E_TIMEOUT if INIT bit value didn't change before timeout has expired.

Definition at line 41 of file fdcan_common.c.

References FDCAN_CCCR, FDCAN_CCCR_INIT, FDCAN_E_OK, and FDCAN_E_TIMEOUT.

Referenced by fdcan_init(), and fdcan_start().

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◆ fdcan_dlc_to_length()

uint8_t fdcan_dlc_to_length ( uint32_t dlc )

Converts DLC value into frame payload length.

Works for both CAN and FDCAN DLC values.

Parameters

[in] dlc DLC value

Returns: data payload length in bytes

Definition at line 221 of file fdcan_common.c.

Referenced by fdcan_get_fifo_element_size(), fdcan_get_txbuf_element_size(), and fdcan_receive().

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◆ fdcan_get_fill_rxfifo()

static void fdcan_get_fill_rxfifo	(	uint32_t	canport,
		uint8_t	fifo_id,
		unsigned *	get_index,
		unsigned *	pending_frames
	)

static

Returns fill state and next available get index from receive FIFO.

Examines FDCAN receive FIFO and returns fill status of FIFO and ID of next message available for reading. If fill status is 0 (FIFO is empty), then get index is undefined.

Parameters

[in]	canport	FDCAN block base address. See FDCAN block base addresses.
[in]	fifo_id	ID of fifo queried (currently 0 or 1)
[out]	get_index	Address of buffer where next get index will be stored
[out]	pending_frames	Address of buffer where amount of pending frame will be stored.

Definition at line 109 of file fdcan_common.c.

References FDCAN_RXFIFO_FL_MASK, FDCAN_RXFIFO_FL_SHIFT, FDCAN_RXFIFO_GI_MASK, FDCAN_RXFIFO_GI_SHIFT, and FDCAN_RXFIS.

Referenced by fdcan_receive().

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◆ fdcan_get_flesa_addr()

struct fdcan_extended_filter * fdcan_get_flesa_addr ( uint32_t canport )

Returns extended filter start address in message RAM.

Parameters

[in] canport FDCAN block base address. See FDCAN block base addresses.

Returns: Base address of extended filter configuration block.

Definition at line 136 of file fdcan_common.c.

References CAN_MSG_BASE, and FDCAN_LFESA_OFFSET.

Referenced by fdcan_init_filter(), and fdcan_set_ext_filter().

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◆ fdcan_get_flssa_addr()

struct fdcan_standard_filter * fdcan_get_flssa_addr ( uint32_t canport )

Returns standard filter start address in message RAM.

Parameters

[in] canport FDCAN block base address. See FDCAN block base addresses.

Returns: Base address of standard filter configuration block.

Definition at line 124 of file fdcan_common.c.

References CAN_MSG_BASE, and FDCAN_LFSSA_OFFSET.

Referenced by fdcan_init_filter(), and fdcan_set_std_filter().

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◆ fdcan_get_free_txbuf()

static int fdcan_get_free_txbuf ( uint32_t canport )

static

Return ID of next free Tx buffer.

Examines transmit buffer allocation in message RAM and returns ID of buffer, which is free.

Parameters

[in] canport FDCAN block base address. See FDCAN block base addresses.

Returns: Non-negative number ID of Tx buffer which is free, or FDCAN_E_BUSY if no Tx buffer is available

Definition at line 85 of file fdcan_common.c.

References FDCAN_E_BUSY, FDCAN_TXBRP, FDCAN_TXBRP_TRP0, FDCAN_TXBRP_TRP1, and FDCAN_TXBRP_TRP2.

Referenced by fdcan_available_tx(), and fdcan_transmit().

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◆ fdcan_get_rxfifo_addr()

struct fdcan_rx_fifo_element * fdcan_get_rxfifo_addr	(	uint32_t	canport,
		unsigned	fifo_id,
		unsigned	element_id
	)

Returns a pointer to an RX FIFO element in message RAM.

Parameters

[in]	canport	FDCAN block base address. See FDCAN block base addresses.
[in]	fifo_id	ID of FIFO whose address is requested
[in]	element_id	the element number in the fifo we're requesting