| Updated: April 19, 2023 |
Set the reference clock frequency and bit timings
#include <sys/can_dcmd.h> #define CAN_DEVCTL_SET_TIMING __DIOT(_DCMD_MISC, CAN_CMD_CODE + 108, struct can_devctl_timing)
| Argument | Value |
|---|---|
| filedes | A file descriptor that you obtained by opening the device |
| dcmd | CAN_DEVCTL_SET_TIMING |
| dev_data_ptr | A pointer to a struct can_devctl_timing |
| n_bytes | sizeof(struct can_devctl_timing) |
| dev_info_ptr | NULL |
This command sets the reference clock frequency and bit timings. For details about the parameters, see the CAN controller reference manual for your hardware. You usually set the timing parameters when you start the driver, not at runtime.
A filled-in struct can_devctl_timing, which is defined in <sys/can_dcmd.h> as follows:
typedef struct can_devctl_timing {
uint32_t ref_clock_freq; /* Reference clock frequency in Hz (don't change if '0') */
uint16_t bit_rate_prescaler; /* Bit rate prescaler */
uint8_t sync_jump_width; /* Time quantum Sync Jump Width */
uint8_t time_segment_1; /* Time quantum Time Segment 1 */
uint8_t time_segment_2; /* Time quantum Time Segment 2 */
} CAN_DEVCTL_TIMING;
None.