我有很多很多问号【DH-H Tina】

The_Qiang LV 4

（我很菜，别骂）
大佬们指点下（如果可以的话，发俩demo参考学习下也好，尤其是带IO操作以及IIC设备的）：

1.在SDK目录下 make kernel_menuconfig 里的选项如何保存并应用，直接选择save一路回车？
（百度上搜了一堆，什么cp xxxx，还有make save 都没反应）

2.想要编写驱动程序生成.KO文件，Makefile 文件如何编写（SDK目录下执行过mkernel，看了些论坛上和百度上的Makefile，尝试了未果）。

3.写的网上学来的基本驱动框架没有在 /dev/下生成节点（放在/opt/d1/tina_d1_open_v2/lichee/linux-5.4/drivers/char/下 并修改
Kconfig 追加hello_drv default y  然后SDK 下make时，就会在该目录下生成相应的ko文件，insmod后也没见节点，
make kernel_menuconfig勾选后 再make，烧录img 也没有节点  ）（相关代码在页面最底下）

4.比如/opt/d1/tina_d1_open_v2/lichee/linux-5.4/drivers/ 里的i2c-dev-basexxx一类的c文件，里面的函数(如i2c_transfer();)，
编写APP时如何调用？还是说只能写的驱动才能调用？

5.关于linux设备数上添加节点，SDK文档介绍说最好是在board.dts中添加，配置pin是这样嘛（也是到处参照写的）？
   &pio {
      ........
         dth_11_pin:dht_11_pin{
         pins = "PC1";
         function = "gpio_out";
         allwinner,pull = <1>;
          bias-pull-up;
            };
    ........
}
不需要再 上面dht_11_pin 后面家@0x.....(地址)嘛？上下的差异很不解
sun20iw1p1.dtsi中
pio: pinctrl@2000000 {
.....
        ledc: ledc@2008000 {
			#address-cells = <1>;
			#size-cells = <0>;
			compatible = "allwinner,sunxi-leds";
			reg = <0x0 0x02008000 0x0 0x400>;
			interrupts-extended = <&plic0 36 IRQ_TYPE_LEVEL_HIGH>;
			interrupt-names = "ledcirq";
			clocks = <&ccu CLK_LEDC>, <&ccu CLK_BUS_LEDC>;
			clock-names = "clk_ledc", "clk_cpuapb";
			dmas = <&dma 42>, <&dma 42>;
			dma-names = "rx", "tx";
			resets = <&ccu RST_BUS_LEDC>;
			reset-names = "ledc_reset";
			status = "disable";
		};
......
}

6.哪吒板子上的iio接口在哪（看到iio下有DHT11驱动想直接用）

下面是参照官方的APP的Makefile
CTOOL := riscv64-unknown-linux-gnu-
CCL := /opt/d1/tina_d1_open_v2/prebuilt/gcc/linux-x86/riscv/toolchain-thead-glibc/riscv64-glibc-gcc-thead_20200702
CC := ${CCL}/bin/${CTOOL}gcc

myproject : *.c
	${CC} -o myproject $^
clean :
	rm myproject

相关路径给大佬参上：

whycan@ubuntu:/opt/d1/tina_d1_open_v2$ pwd
/opt/d1/tina_d1_open_v2
whycan@ubuntu:/opt/d1/tina_d1_open_v2$ find -name "linux-5*"
./out/d1-h-nezha/compile_dir/target/linux-d1-h-nezha/linux-5.4.61
./.repo/project-objects/lichee/linux-5.4.git
./.repo/projects/lichee/linux-5.4.git
./lichee/linux-5.4
./device/config/chips/d1-h/configs/nezha_min/linux-5.4
./device/config/chips/d1-h/configs/nezha/linux-5.4
./device/config/chips/d1s/configs/nezha/linux-5.4
whycan@ubuntu:/opt/d1/tina_d1_open_v2$

漫长无聊的代码以及错误信息参上：

whycan@ubuntu:/mnt/hgfs/vmout/project/hellodev$ ls

hello_drv.c  Makefile

whycan@ubuntu:/mnt/hgfs/vmout/project/hellodev$ cat Makefile 

KDIR =/opt/d1/tina_d1_open_v2/out/d1-h-nezha/compile_dir/target/linux-d1-h-nezha/linux-5.4.61
CTOOL := riscv64-unknown-linux-gnu-
CCL := /opt/d1/tina_d1_open_v2/prebuilt/gcc/linux-x86/riscv/toolchain-thead-glibc/riscv64-glibc-gcc-thead_20200702
CC := ${CCL}/bin/${CTOOL}gcc
CURRENT_PATH:=$(shell pwd)
LINUX_KERNEL:=$(shell uname -r)
KVERSION:=5.4
PWD:=$(shell pwd)

all:
	make -C $(KDIR) M=$(PWD) modules    CROSS_COMPILE=riscv64-unknown-linux-gnu-  ARCH=riscv
#myproject : *.c
#	${CC} -o myproject $^
clean :
	rm myproject

obj-m += hello_drv.o
whycan@ubuntu:/mnt/hgfs/vmout/project/hellodev$ make 
make -C /opt/d1/tina_d1_open_v2/out/d1-h-nezha/compile_dir/target/linux-d1-h-nezha/linux-5.4.61 M=/mnt/hgfs/vmout/project/hellodev modules    CROSS_COMPILE=riscv64-unknown-linux-gnu-  ARCH=riscv
make[1]: Entering directory '/opt/d1/tina_d1_open_v2/lichee/linux-5.4'
make[1]: riscv64-unknown-linux-gnu-gcc: Command not found
  CC [M]  /mnt/hgfs/vmout/project/hellodev/hello_drv.o
In file included from ./include/linux/list.h:9,
                 from ./include/linux/module.h:9,
                 from /mnt/hgfs/vmout/project/hellodev/hello_drv.c:1:
./include/linux/kernel.h:6:10: fatal error: stdarg.h: No such file or directory
 #include <stdarg.h>
          ^~~~~~~~~~
compilation terminated.
scripts/Makefile.build:286: recipe for target '/mnt/hgfs/vmout/project/hellodev/hello_drv.o' failed
make[2]: *** [/mnt/hgfs/vmout/project/hellodev/hello_drv.o] Error 1
Makefile:1810: recipe for target '/mnt/hgfs/vmout/project/hellodev' failed
make[1]: *** [/mnt/hgfs/vmout/project/hellodev] Error 2
make[1]: Leaving directory '/opt/d1/tina_d1_open_v2/lichee/linux-5.4'
Makefile:15: recipe for target 'all' failed
make: *** [all] Error 2

whycan@ubuntu:/mnt/hgfs/vmout/project/hellodev$ cat hello_drv.c 

//==============================================
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/miscdevice.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/mutex.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/tty.h>
#include <linux/kmod.h>
#include <linux/gfp.h>

static int major =0;
static int err;
static char kernel_buf [1024];
static struct  class * hello_class;
#define MIN(a,b)(a < b ? a : b)
static ssize_t hello_drv_read(struct file *file, char __user *user, size_t bytesize, loff_t *this_loff_t){
	int err0;
	printk("%s %s line %d \n ",__FILE__,__FUNCTION__,__LINE__);
	err0 = copy_to_user(user,kernel_buf,MIN(1024,bytesize));
	return err0;
}

static ssize_t  hello_drv_write(struct file *file, const  char __user *user, size_t bytesize, loff_t *this_loff_t){
	int err0;
	printk("%s %s line %d \n ",__FILE__,__FUNCTION__,__LINE__);
	err0 = copy_from_user(kernel_buf,user,MIN(1024,bytesize));
	return err0;
}

static int hello_drv_open(struct inode *inode, struct file *file){
	int err0; 
	err0 = printk("%s %s line %d \n ",__FILE__,__FUNCTION__,__LINE__);
	return err0;
}

static int hello_drv_close(struct inode *inode, struct file *file){
	int err0;
	err0 = printk("%s %s line %d \n ",__FILE__,__FUNCTION__,__LINE__);
	return err0;
}

static struct file_operations hello_drv ={
	.owner  	= THIS_MODULE,
	.open 		= hello_drv_open,
	.read 		= hello_drv_read,
	.write 		= hello_drv_write,
	.release	        = hello_drv_close 
};

static int __init hello_init(void){
	printk("%s %s line %d \n ",__FILE__,__FUNCTION__,__LINE__);
	register_chrdev(0,"hello",&hello_drv);
	
	hello_class = class_create(THIS_MODULE ,"hello_class");
	err = PTR_ERR(hello_class);
	if(IS_ERR (hello_class)){
		unregister_chrdev(major,"hello");
		return -1;
	}
	
	device_create(hello_class,NULL ,MKDEV(major ,0),NULL,"hello");
	
	return 0;
}
static void __exit hello_exit(void){
	printk("%s %s line %d \n ",__FILE__,__FUNCTION__,__LINE__);
	unregister_chrdev(major,"hello");
	device_destroy(hello_class,MKDEV(major,0));
	class_destroy(hello_class);
}

module_init(hello_init);
module_exit(hello_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("XD");
//==============================================

YterAA LV 7

1.在Tina SDK make kernel_menuconfig 点击save后保存应用均为自动操作，save了就可以了
2.生成ko文件makefile里吧obj-y改为obj-m。
3.驱动编写教程参考：https://v853.docs.aw-ol.com/soft/dev_gpio/#led
4.APP不能调用kernel层的操作，需要Port一些操作，可以是用户层接口，也可以是VFS
5.设备树相关：https://v853.docs.aw-ol.com/soft/dev_gpio/#pinctrl
6.iio接口的驱动应该是其他平台使用的，哪吒板子没有IIO接口

针对哪吒板子，PerfXLab 提供了多个demo可供使用，可以参照：https://github.com/rvboards/d1_demo