收到错误：我明确拥有正确数字的参数太少

如何解决收到错误：我明确拥有正确数字的参数太少

| 我正在编写代码以使用\“ / linux / i2c.h \”中的标准接口来访问i2c驱动程序（从内核空间） 当我尝试调用如下所示的方法时，出现错误：（参数太少）。随附的是\“ i2c.c \”中定义的方法的实现代码 我的代码：

static inline unsigned char i2cReadByte()
{
    unsigned char retVal = 0x00;
    struct i2c_msg value;
    //Todo Fill in msg
    i2c_transfer((struct i2c_msg*)&value); // Error: too few arguments to function \'i2c_transfer\'
    return retVal;
}

i2c.c中定义的i2c_transfer代码：

int i2c_transfer(struct i2c_msg *msg)
{
    int ret;

    if (!msg)
        goto transfer_error_msg_empty;

    switch(msg->direction) {

    case I2C_WRITE:

        /* check if bus is not busy */
        if (!i2c_isr_set_cleared(0,ISR_IBB))
            goto transfer_error_bus_busy;

        /* start transmission */
        ICR &= ~ICR_START;
        ICR &= ~ICR_STOP;
        IDBR = msg->data;
        if (msg->condition == I2C_COND_START)     ICR |=  ICR_START;
        if (msg->condition == I2C_COND_STOP)      ICR |=  ICR_STOP;
        if (msg->acknack   == I2C_ACKNAK_SENDNAK) ICR |=  ICR_ACKNAK;
        if (msg->acknack   == I2C_ACKNAK_SENDACK) ICR &= ~ICR_ACKNAK;
        ICR &= ~ICR_ALDIE;
        ICR |= ICR_TB;

        /* transmit register empty? */
        if (!i2c_isr_set_cleared(ISR_ITE,0))
            goto transfer_error_transmit_timeout;

        /* clear \'transmit empty\' state */
        ISR |= ISR_ITE;

        /* wait for ACK from slave */
        if (msg->acknack == I2C_ACKNAK_WAitacK)
            if (!i2c_isr_set_cleared(0,ISR_ACKNAK))
                goto transfer_error_ack_missing;
        break;

    case I2C_READ:

        /* check if bus is not busy */
        if (!i2c_isr_set_cleared(0,ISR_IBB))
            goto transfer_error_bus_busy;

        /* start receive */
        ICR &= ~ICR_START;
        ICR &= ~ICR_STOP;
        if (msg->condition == I2C_COND_START)     ICR |= ICR_START;
        if (msg->condition == I2C_COND_STOP)      ICR |= ICR_STOP;
        if (msg->acknack   == I2C_ACKNAK_SENDNAK) ICR |=  ICR_ACKNAK;
        if (msg->acknack   == I2C_ACKNAK_SENDACK) ICR &= ~ICR_ACKNAK;
        ICR &= ~ICR_ALDIE;
        ICR |= ICR_TB;

        /* receive register full? */
        if (!i2c_isr_set_cleared(ISR_IRF,0))
            goto transfer_error_receive_timeout;

        msg->data = IDBR;

        /* clear \'receive empty\' state */
        ISR |= ISR_IRF;

        break;

    default:

        goto transfer_error_illegal_param;

    }

    return 0;

transfer_error_msg_empty:
        PRINTD((\"i2c_transfer: error: \'msg\' is empty\\n\"));
        ret = -1; goto i2c_transfer_finish;

transfer_error_transmit_timeout:
        PRINTD((\"i2c_transfer: error: transmit timeout\\n\"));
        ret = -2; goto i2c_transfer_finish;

transfer_error_ack_missing:
        PRINTD((\"i2c_transfer: error: ACK missing\\n\"));
        ret = -3; goto i2c_transfer_finish;

transfer_error_receive_timeout:
        PRINTD((\"i2c_transfer: error: receive timeout\\n\"));
        ret = -4; goto i2c_transfer_finish;

transfer_error_illegal_param:
        PRINTD((\"i2c_transfer: error: illegal parameters\\n\"));
        ret = -5; goto i2c_transfer_finish;

transfer_error_bus_busy:
        PRINTD((\"i2c_transfer: error: bus is busy\\n\"));
        ret = -6; goto i2c_transfer_finish;

i2c_transfer_finish:
        PRINTD((\"i2c_transfer: ISR: 0x%04x\\n\",ISR));
        i2c_reset();
        return ret;

}

    

解决方法

您与

linux/i2c.h

中的其中一个内核函数发生了名称冲突：

/* Transfer num messages.
 */
extern int i2c_transfer(struct i2c_adapter *adap,struct i2c_msg *msgs,int num);

    ,我可以看到i2c_transfer签名是

int i2c_transfer (  struct i2c_adapter * adap,struct i2c_msg * msgs,int num);

在Linux内核上