#include <hw/i2c.h> #define DCMD_I2C_SET_BUS_SPEED __DIOT (_DCMD_I2C, 2, uint32_t)
The arguments to devctl() are:
| Argument | Value |
|---|---|
| filedes | A file descriptor that you obtained by opening the device. |
| dcmd | DCMD_I2C_SET_BUS_SPEED |
| dev_data_ptr | A pointer to a uint32_t |
| n_bytes | sizeof(uint32_t) |
| dev_info_ptr | NULL |
The DCMD_I2C_SET_BUS_SPEED command sets the bus speed for the current connection. You should set the bus speed before attempting a data-transfer operation.
If an error occurs, the command returns: