报一个LPC4008代码中I2C的bug

发布于 2015-07-27 10:42:00 浏览：3425 订阅该版

淘宝买的LPC4008开发板，验证I2C时发现bug
只能写一个寄存器，调了一下，发现bug如下

```c
static rt_size_t lpc_i2c_recv_bytes(LPC_I2C_TypeDef *I2Cx, struct rt_i2c_msg *msg)
{
    rt_size_t bytes = 0;
    rt_size_t len = msg->len;
    rt_uint32_t stat = 0;
    while (len--)
    {
        I2Cx->CONCLR = I2C_I2CONCLR_SIC;
        if (len == 0)
        {
            I2Cx->CONCLR = I2C_I2CONCLR_AAC;
        }
        else
        {
            I2Cx->CONSET = I2C_I2CONSET_AA;
        }
        while (!(I2Cx->CONSET & I2C_I2CONSET_SI));

msg->buf[bytes++]  = (uint8_t)(I2Cx->DAT & I2C_I2DAT_BITMASK);
        stat = I2Cx->STAT & I2C_STAT_CODE_BITMASK;
        if (len && (I2C_I2STAT_M_RX_DAT_ACK != stat))
        {
            i2c_dbg("i2c recv error on the byte of %d,send ack error!
", bytes);
            return bytes;
        }
       **_ if ((len==0)&&(I2C_I2STAT_M_RX_DAT_NACK != stat))_**
        {
            i2c_dbg("i2c recv error on the byte of %d,send nack error!
", bytes);
            return bytes;
        }
    }

return bytes;
}
```

原来是`else if(I2C_I2STAT_M_RX_DAT_NACK != stat)`

请验证修改