V853做hid gadget小机排故笔记

xjy_5 LV 5

报错排故笔记，USB新手，许多概念不清楚，可能最后也搞不定，梳理一下今天读代码知道的东西，当然也是希望有大佬指点迷津，那是莫大的帮助
V853自带setusbconfig脚本，可以很方便的配置gadget，我把D1-H的setusbconfig放到这儿，用setusbconfig hid,回复

root@TinaLinux:/#     setusbconfig hid
[   52.903876] configfs-gadget gadget: adding 'hid'/ddc84c70 to config 'c'/dde4b6a8
[   52.912290] configfs-gadget gadget: fun:usb_gadget_ep_match_desc
[   52.919176] configfs-gadget gadget: line:960
[   52.924104] configfs-gadget gadget: fun:usb_gadget_ep_match_desc
[   52.930835] configfs-gadget gadget: fun:usb_gadget_ep_match_desc
[   52.937651] configfs-gadget gadget: line:960
[   52.942433] configfs-gadget gadget: fun:usb_gadget_ep_match_desc
[   52.949231] configfs-gadget gadget: fun:usb_gadget_ep_match_desc
[   52.955992] configfs-gadget gadget: line:960
[   52.960812] configfs-gadget gadget: fun:usb_gadget_ep_match_desc
[   52.967572] configfs-gadget gadget: line:960
[   52.972388] configfs-gadget gadget: line:967
[   52.977350] configfs-gadget gadget: line:973
[   52.982145] configfs-gadget gadget: fun:usb_ep_autoconfig_ss line:90
[   52.989501] configfs-gadget gadget: fun:usb_gadget_ep_match_desc
[   52.996313] configfs-gadget gadget: fun:usb_gadget_ep_match_desc
[   53.003148] configfs-gadget gadget: line:960
[   53.007959] configfs-gadget gadget: fun:usb_gadget_ep_match_desc
[   53.014768] configfs-gadget gadget: fun:usb_gadget_ep_match_desc
[   53.021498] configfs-gadget gadget: line:960
[   53.026439] configfs-gadget gadget: fun:usb_gadget_ep_match_desc
[   53.033213] configfs-gadget gadget: line:960
[   53.038039] configfs-gadget gadget: fun:usb_gadget_ep_match_desc
[   53.044804] configfs-gadget gadget: fun:usb_gadget_ep_match_desc
[   53.051575] configfs-gadget gadget: fun:usb_gadget_ep_match_desc
[   53.058336] configfs-gadget gadget: line:960
[   53.063177] configfs-gadget gadget: fun:usb_ep_autoconfig_ss line:94
[   53.070297] configfs-gadget gadget: fail line:715 ep:0
[   53.076112] configfs-gadget gadget: hidg_bind FAILED
[   53.081675] configfs-gadget gadget: adding 'hid'/ddc84c70 --> -19
[   53.088582] configfs-gadget 4100000.udc-controller: failed to start g1: -19
sh: write error: No such device
root@TinaLinux:/#

原本这里只回复

[   68.343732] configfs-gadget gadget: hidg_bind FAILED
[   68.349296] configfs-gadget gadget: adding 'hid'/ddc84c70 --> -19
[   68.356214] configfs-gadget 4100000.udc-controller: failed to start g1: -19
sh: write error: No such device

为了了解究竟发生了什么，在这三个文件里加了打印来确定哪个if没通过

linux-4.9/drivers/usb/gadget/function/f_hid.c
linux-4.9/drivers/usb/gadget/epautoconf.c
linux-4.9/drivers/usb/gadget/udc/core.c

出错的地方是 f_hid.c-> hidg_bind -> usb_ep_autoconfig

而usb_ep_autoconfig用到的是 epautoconf.c -> usb_ep_autoconfig_ss，usb_gadget_ep_match_desc 没找着匹配的端点

最后是在gadget/udc/core.c的usb_gadget_ep_match_desc函数没通过if (!ep->caps.type_int)

原来是没通过支持中断传输的检查

xjy_5 LV 5

现在有点眉目了，看了一上午的gadget初始化流程，困得不行，现在V853已经可以做HID设备发出'a'了，但不确定这么改会不会出什么bug，主要是修改了sunxi_udc的默认配置
修改了 sunxi_usb\include\sunxi_udc.h 的ep2的相关内容,把bulk改成了int，把ep_fifo的偏移地址做了修改

static const char ep0name[] = "ep0";
static const char ep1in_bulk_name[] = "ep1in-bulk";
static const char ep1out_bulk_name[] = "ep1out-bulk";
static const char ep2in_int_name[] = "ep2in-int";
static const char ep2out_int_name[] = "ep2out-int";
static const char ep3_iso_name[] = "ep3-iso";
static const char ep4_int_name[] = "ep4-int";
static const char ep5in_bulk_name[] = "ep5in-bulk";
static const char ep5out_bulk_name[] = "ep5out-bulk";

static const struct sw_udc_fifo ep_fifo[] = {
{ep0name, 0, 512, 0},
{ep1in_bulk_name, 512, 1024, 1},
{ep1out_bulk_name, 1536, 1024, 1},
{ep2in_int_name, 2560, 512, 0},
{ep2out_int_name, 3584-512, 512, 0},
{ep3_iso_name, 4608-1024, 1024, 0},
{ep4_int_name, 5632-1024, 512, 0},
{ep5in_bulk_name, 6144-1024, 1024, 1},
{ep5out_bulk_name, 7168-1024, 1024, 1},
};

sunxi_usb\udc\sunxi_udc.c 也是类似，对应的内容在sunxi_udc的 ep[3],ep[4]

.ep[3] = {
	.num			= 2,
	.ep = {
		.name		= ep2in_int_name,
		.ops		= &sunxi_udc_ep_ops,
		.maxpacket	= SW_UDC_EP_FIFO_SIZE,
		.maxpacket_limit = SW_UDC_EP_FIFO_SIZE,
		.caps	= USB_EP_CAPS(USB_EP_CAPS_TYPE_INT,
				USB_EP_CAPS_DIR_IN),
	},
	.dev		        = &sunxi_udc,
	.bEndpointAddress   = (USB_DIR_IN | 2),
	.bmAttributes	    = USB_ENDPOINT_XFER_INT,
},

.ep[4] = {
	.num			= 2,
	.ep = {
		.name		= ep2out_int_name,
		.ops		= &sunxi_udc_ep_ops,
		.maxpacket	= SW_UDC_EP_FIFO_SIZE,
		.maxpacket_limit = SW_UDC_EP_FIFO_SIZE,
		.caps	= USB_EP_CAPS(USB_EP_CAPS_TYPE_INT,
				USB_EP_CAPS_DIR_OUT),
	},
	.dev		        = &sunxi_udc,
	.bEndpointAddress   = (USB_DIR_OUT | 2),
	.bmAttributes	    = USB_ENDPOINT_XFER_INT,
},

这就完了，然后重新编译，打包，找个了hid gadget键盘的例程，简化了下，只发送‘a’


/*a~z，A~Z通过usb循环回显到host端*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdbool.h>
#include <poll.h>
#include <string.h>
#include <time.h>
#include <signal.h>
#include <fcntl.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
 
 
#define DevName "/dev/hidg0"
static int key_fd = -1;
static int g_bExit = 0;
#define DELAY_WAIT_TIME(); usleep(100*1000); 
 
 
static int Hid_Send_OneGBKEnglish(const unsigned char charactor)
{
    int offset = 0;
	static unsigned char charBase = 0x04; /* A or a */
    unsigned char keyType = 0;
    unsigned char report[8] = {0};
	
    if(charactor >= 'a' && charactor <= 'z')
    {
        keyType = 0;
        offset = charactor - 'a';
    }
    else if(charactor >= 'A' && charactor <= 'Z')
    {
        keyType = 0x02;
        offset = charactor - 'A';
    }
	else
	{
		printf("[fun:%s - Line:%d]unable to support charactor:0x%02x\n", __FUNCTION__, __LINE__, charactor);
	}
 
    memset(report, 0, 8);
    report[0] = 0x00;
    report[2] = 0x00;
    write(key_fd, report, 8);
 
    memset(report, 0, 8);
    report[0] = keyType;
    report[2] = charBase + offset;
    write(key_fd, report, 8);
 
    memset(report, 0, 8);
    report[0] = keyType;
    report[2] = 0x00;
    write(key_fd, report, 8);
 
    memset(report, 0, 8);
    report[0] = 0x00;
    report[2] = 0x00;
    write(key_fd, report, 8);
 
    DELAY_WAIT_TIME(); 
    return 0; 
}
 
static int Hid_Send_Enter()
{
    unsigned char report[8] = {0};
 
    memset(report, 0, 8);
    report[0] = 0x00;
    report[2] = 0x28;
    write(key_fd, report, 8);
 
    memset(report, 0, 8);
    report[0] = 0x00;
    report[2] = 0x00;
    write(key_fd, report, 8);
 
    DELAY_WAIT_TIME(); 
    return 0; 
}
 
static int Hid_Send_Space()
{
    unsigned char report[8] = {0};
 
    memset(report, 0, 8);
    report[0] = 0x00;
    report[2] = 0x2C;
    write(key_fd, report, 8);
 
    memset(report, 0, 8);
    report[0] = 0x00;
    report[2] = 0x00;
    write(key_fd, report, 8);
 
    DELAY_WAIT_TIME(); 
    return 0; 
}
 
void HandleSig(signed int signo)
{
    if (signo == SIGINT)
    {
        printf("catch Ctrl + C, exit normally\n");
 
        g_bExit = 1;
    }
}
 
extern void HandleSig(signed int signo);
int main(int argc, char *argv[])
{
    unsigned char charactor;
 
	key_fd = open("/dev/hidg0", O_RDWR, 0666);
	if (key_fd<0)
	{
        printf("error\n");
		return -1;
	}
 
    charactor = 'a';
    Hid_Send_OneGBKEnglish(charactor++);
    Hid_Send_Space();
    Hid_Send_Enter();
    close(key_fd);
 
	return 0;
}

上传上面的代码编译成app，chmod 给予运行权限，我这里是编译成了hidapp

chmod 777 ./hidapp

kernel/linux-4.9/Documentation/usb/gadget_hid.txt也有例程，但比较复杂全面，一时半会我也看不懂，

然后就是指令
killall adbd 2>/dev/null
setusbconfig hid
cat /sys/devices/platform/soc/usbc0/usb_host
cat /sys/devices/platform/soc/usbc0/usb_device
先关掉ADB程序，再开脚本设置hid键盘，现在就没报错了，但电脑还是没识别到键盘，需要转换usb口到host再转到device才能用，这个时候设备管理器就能看到新键盘了

app测试

说一下其他问题，我用的adb上传文件，每次都要cat /sys/devices/platform/soc/usbc0/usb_host
cat /sys/devices/platform/soc/usbc0/usb_device才能用，完了要是拔插usb口，虚拟机的usb就会卡死再也无法识别，电脑也关不了机，只能强制重启，这个问题很影响调试，有办法解决吗？

xjy_5 LV 5

妈呀，突然发现这部分内容在v853系统开发手册里面有说，但我之前都不知道！不过里面没有给出文件路径，只说了可以修改这些定义，有点云里雾里

sofia LV 5

@xjy_5 _5 你好能否把pc端的usb软件发我下谢谢

xjy_5 LV 5

@sofia 测试USB的APP的源码已经放上来了。我在串口命令行运行app马上就会从开发板的usb发出‘a’，所以就打在命令行上了