2301_77958281: 为什么输出的数字总是少了第一个

2004v2004: lxh@lxh-VirtualBox:/usr/src/linux-headers-5.11.0-34-generic/include/linux$ grep i2c_transfer ./* -rn ./greybus/greybus_protocols.h:675:struct gb_i2c_transfer_op { ./greybus/greybus_protocols.h:681:struct gb_i2c_transfer_request { ./greybus/greybus_protocols.h:683: struct gb_i2c_transfer_op ops[]; /* op_count of these */ ./greybus/greybus_protocols.h:685:struct gb_i2c_transfer_response { ./i2c.h:61:int i2c_transfer_buffer_flags(const struct i2c_client *client, ./i2c.h:75: return i2c_transfer_buffer_flags(client, buf, count, I2C_M_RD); ./i2c.h:90: return i2c_transfer_buffer_flags(client, buf, count, ./i2c.h:105: return i2c_transfer_buffer_flags(client, (char *)buf, count, 0); ./i2c.h:120: return i2c_transfer_buffer_flags(client, (char *)buf, count, ./i2c.h:126:int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num); ./i2c.h:128:int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num); lxh@lxh-VirtualBox:/usr/src/linux-headers-5.11.0-34-generic/includ

2004v2004: 好的 ，谢谢了 ，确定已经引用#include

hahaha_1994: [code=plain] root@kun:/usr/src/linux-headers-4.15.0-163-generic/include/linux# uname -a Linux kun 4.15.0-163-generic #171-Ubuntu SMP Fri Nov 5 11:55:11 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux root@kun:/usr/src/linux-headers-4.15.0-163-generic/include/linux# root@kun:/usr/src/linux-headers-4.15.0-163-generic/include/linux# grep i2c_transfer ./* -rn ./i2c.h:73:extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, ./i2c.h:76:extern int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, root@kun:/usr/src/linux-headers-4.15.0-163-generic/include/linux# [/code] 你是否引用了头文件#include 你可以在linux内核drivers/i2c/i2c-core-base.c文件中找到相关定义 清华镜像站v5.x内核下载地址:https://mirrors.tuna.tsinghua.edu.cn/kernel/v5.x/

2004v2004: ret = i2c_transfer(adap, &msg, 1); // 调用平台接口接收数据 i2c_transfer 这个函数哪里来的，我咋没找到呢，使用提示未定义