linux i2c 多字节读写,iic 多字节读出现问题，还请指导，谢谢
static struct rt_i2c_bus_device *i2c_bus_dev;static int rt_i2c_write_reg(uint16_t addr, uint16_t reg, uint8_t *data, uint16_t len){rt_int8_t res = 0;rt_uint8_t tmp = reg;struct rt_i2c_msg msgs[2];msgs
static struct rt_i2c_bus_device *i2c_bus_dev;
static int rt_i2c_write_reg(uint16_t addr, uint16_t reg, uint8_t *data, uint16_t len)
{
rt_int8_t res = 0;
rt_uint8_t tmp = reg;
struct rt_i2c_msg msgs[2];
msgs[0].addr = addr; /* Slave address */
msgs[0].flags = RT_I2C_WR; /* Write flag */
msgs[0].buf = &tmp; /* Slave register address */
msgs[0].len = 1; /* Number of bytes sent */
msgs[1].addr = addr; /* Slave address */
msgs[1].flags = RT_I2C_WR | RT_I2C_NO_START; /* Read flag */
msgs[1].buf = data; /* Read data pointer */
msgs[1].len = len; /* Number of bytes read */
if (rt_i2c_transfer(i2c_bus_dev, msgs, 2) == 2)
{
res = RT_EOK;
}
else
{
res = -RT_ERROR;
}
return res;
}
static int rt_i2c_read_reg(uint16_t addr, uint16_t reg, uint8_t *data, uint16_t len)
{
rt_int8_t res = 0;
rt_uint8_t tmp = reg;
struct rt_i2c_msg msgs[2];
msgs[0].addr = addr; /* Slave address */
msgs[0].flags = RT_I2C_WR; /* Write flag */
msgs[0].buf = &tmp; /* Slave register address */
msgs[0].len = 1; /* Number of bytes sent */
msgs[1].addr = addr; /* Slave address */
msgs[1].flags = RT_I2C_RD; /* Read flag */
msgs[1].buf = data; /* Read data pointer */
msgs[1].len = len; /* Number of bytes read */
if (rt_i2c_transfer(i2c_bus_dev, msgs, 2) == 2)
{
res = RT_EOK;
}
else
{
res = -RT_ERROR;
}
return res;
}
你用这两个函数试试？
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