/**
* @brief Receive an amount of bytes from an I2C chip in master mode.
* @param client I2C client to receive data from.
* @param buf Buffer to store the received data in.
* @param count Length of \p buf.
* @return count Length of \p buf in bytes.
*/
int i2c_master_recv(const struct i2c_client *client, char *buf, int count)
{
struct i2c_bus *bus = client->bus;
struct i2c_msg msg;
int ret;
msg.dest_addr = client->addr;
set_bit(I2C_RD_FLAG, &msg.flags);
msg.len = count;
msg.buff = buf;
msg.idx = 0;
ret = i2c_bus_xfer(bus, &msg, 1);
return (ret == 1) ? count : -EINVAL;
}
/**
* @brief Sent a single buffer to a chip in master mode.
* @param client I2C client to set \p buff to.
* @param buf Buffer which has to be sent over an I2C bus.
* @param count Length of \p buf.
* @return count Length of \p buf in bytes.
* @return Amount of bytes sent if succesfull, otherwise an error code.
*/
int i2c_master_send(const struct i2c_client *client, const char *buf, int count)
{
int ret;
struct i2c_bus *bus;
struct i2c_msg msg;
bus = client->bus;
msg.dest_addr = client->addr;
msg.flags = 0;
msg.len = count;
msg.idx = 0;
msg.buff = (char*)buf;
ret = i2c_bus_xfer(bus, &msg, 1);
return (ret == 1) ? count : -EINVAL;
}
/**
* @brief I2C bus read function
* @param handle[in]: i2c bus handle
* @param data[out]: data buffer
* @param len[in]: data length
* @return data length/ERROR_ID
*/
int gp_i2c_bus_read(int handle, unsigned char* data, unsigned int len)
{
return i2c_bus_xfer(handle, data, len, I2C_BUS_READ);
}
/**
* @brief I2C bus write function
* @param handle[in]: i2c bus handle
* @param data[in]: data to write
* @param len[in]: data length
* @return data length/ERROR_ID
*/
int gp_i2c_bus_write(int handle, unsigned char* data, unsigned int len)
{
return i2c_bus_xfer(handle, data, len, I2C_BUS_WRITE);
}
