#include <hw/i2c.h> #define DCMD_I2C_RECV __DIOTF(_DCMD_I2C, 6, i2c_recv_t)
The arguments to devctl() are:
Argument | Value |
---|---|
filedes | A file descriptor that you obtained by opening the device. |
dcmd | DCMD_I2C_RECV |
dev_data_ptr | A pointer to a i2c_recv_t, followed by the receive buffer |
n_bytes | sizeof(i2c_recv_t) plus the size of the receive buffer |
dev_info_ptr | NULL |
The DCMD_I2C_RECV command executes a master receive transaction. It returns when the transaction is complete.
The i2c_recv_t structure is defined as:
typedef struct { i2c_addr_t slave; /* slave address */ uint32_t len; /* length of receive data in bytes */ uint32_t stop; /* send stop when complete? (0=no, 1=yes) */ } i2c_recv_t;
If an error occurs, the command returns: