#include <hw/i2c.h> #define DCMD_I2C_SEND __DIOT (_DCMD_I2C, 5, i2c_send_t)
The arguments to devctl() are:
Argument | Value |
---|---|
filedes | A file descriptor that you obtained by opening the device. |
dcmd | DCMD_I2C_SEND |
dev_data_ptr | A pointer to a i2c_send_t that's followed by additional data |
n_bytes | sizeof(i2c_send_t) plus the size of the additional data |
dev_info_ptr | NULL |
The DCMD_I2C_SEND command executes a master send transaction. It returns when the transaction is complete.
typedef struct { i2c_addr_t slave; /* slave address */ uint32_t len; /* length of send data in bytes */ uint32_t stop; /* send stop when complete? (0=no, 1=yes) */ } i2c_send_t;
If an error occurs, the command returns: