2.13. `mcp2515` — CAN BUS chipset¶

Source code: src/drivers/mcp2515.h, src/drivers/mcp2515.c

Test code: tst/drivers/mcp2515/main.c

Version: 7.0.0

Defines

MCP2515_SPEED_1000KBPS¶

MCP2515_SPEED_500KBPS¶

MCP2515_MODE_NORMAL¶

MCP2515_MODE_LOOPBACK¶

Functions

int mcp2515_init(struct mcp2515_driver_t *self_p, struct spi_device_t *spi_p, struct pin_device_t *cs_p, struct exti_device_t *exti_p, chan_t *chin_p, int mode, int speed)¶

Initialize given driver object.

Return

zero(0) or negative error code.

Parameters

self_p -
Driver object to initialize.
spi_p -
SPI driver to use.
cs_p -
SPI chip select pin.
exti_p -
External interrupt tp use.
chin_p -
Frames received from the hardware are written to this channel.
mode -
Device mode.
speed -
CAN bus speed in kbps.

int mcp2515_start(struct mcp2515_driver_t *self_p)¶

Starts the CAN device using given driver object.

Return

zero(0) or negative error code.

Parameters

self_p -
Initialized driver object.

int mcp2515_stop(struct mcp2515_driver_t *self_p)¶

Stops the CAN device referenced by driver object.

Return

zero(0) or negative error code.

Parameters

self_p -
Initialized driver object.

ssize_t mcp2515_read(struct mcp2515_driver_t *self_p, struct mcp2515_frame_t *frame_p)¶

Read a CAN frame.

Return

zero(0) or negative error code.

Parameters

self_p -
Initialized driver object.
frame_p -
Read frame.

ssize_t mcp2515_write(struct mcp2515_driver_t *self_p, const struct mcp2515_frame_t *frame_p)¶

Write a CAN frame.

Return

zero(0) or negative error code.

Parameters

self_p -
Initialized driver object.
frame_p -
Frame to write.

struct mcp2515_frame_t¶

Public Members

uint32_t id¶

int size¶

int rtr¶

uint32_t timestamp¶

uint8_t data[8]¶

struct mcp2515_driver_t¶

Public Functions

mcp2515_driver_t::THRD_STACK(stack, 1024)

Public Members

struct spi_driver_t spi¶

struct exti_driver_t exti¶

int mode¶

int speed¶

struct chan_t chout¶

struct chan_t *chin_p¶

struct sem_t isr_sem¶

struct sem_t tx_sem¶