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楼主 # 2021-08-29 18:56:25

xfdr0805
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注册时间: 2020-07-23
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在全志V3s上使用红外接收头

确定要使用的GPIO,这里需要使用带外部中断的引脚,否则驱动注册失败 request:-22

这是我的设备树配置

 ir_gpio {
 compatible  = "gpio-ir-receiver";
 gpios = <&pio 1 5 GPIO_ACTIVE_LOW>; /* PB5 */
 /*active_low = <1>;*/
 linux,rc-map-name = "rc-tevii-nec";
 status = "okay";
};

内核里修改

Device Drivers > Remote Controller support >

 [*]   LIRC user interface                                             
 [*]   Remote controller decoders  --->                                
 [*]   Remote Controller devices  --->                                 
       <*>   GPIO IR remote control 

驱动成功加载会有如下输出

[ 1.223257] IR NEC protocol handler initialized
[ 1.227806] IR RC5(x/sz) protocol handler initialized
[ 1.232985] IR RC6 protocol handler initialized
[ 1.237517] IR JVC protocol handler initialized
[ 1.242080] IR Sony protocol handler initialized
[ 1.246693] IR SANYO protocol handler initialized
[ 1.251406] IR Sharp protocol handler initialized
[ 1.256104] IR RCMM protocol handler initialized
[ 1.261050] Registered IR keymap rc-tevii-nec
[ 1.265477] rc rc0: gpio_ir_recv as /devices/platform/ir_gpio/rc/rc0
[ 1.272194] rc rc0: lirc_dev: driver gpio_ir_recv registered at minor = 0, raw IR receiver, no transmitter
[ 1.282144] input: gpio_ir_recv as /devices/platform/ir_gpio/rc/rc0/input3

此时查看/dev/input目录下,会有如下显示:

 # evtest 
 No device specified, trying to scan all of /dev/input/event*
 Available devices:
 /dev/input/event0:      1c22800.lradc
 /dev/input/event1:      rotary@0
 /dev/input/event2:      ns2009_ts
 /dev/input/event3:      gpio_ir_recv

此时如果用evtest测试按键是没有任何反应的,需要修改对应的驱动,此问题先留在这里
不影响后续操作

后来查资料,发现可以用lirc里的工具去测试硬件是否OK,测试之前要先修改默认配置文件,不修改的话,同样没反应

 # vi /etc/lirc/lirc_options.conf 
 driver          = default
 device          = /dev/lric0
 修改这2行就可以,里边driver默认是uinput,device默认是auto
 再次测试就有反应了
 # mode2 -m -d /dev/lirc0
 Using driver default on device /dev/lirc0
 Trying device: /dev/lirc0
 Using device: /dev/lirc0
 Warning: Running as root.
    9043     4402      626      497      656      499
     624      499      656      499      624      499
     656      499      624      499      624      531
     624     1630      619     1624      655     1624
     624     1624      624     1634      646     1624
     624     1624      655     1624      593     1656
     624      501      654     1624      593      534
     652     1624      624      499      625     1624
     656      504      619      499      655     1625
     624      499      656     1625      593      531
     624     1633      648      498      624     1624
     624    40035  
    9060     2184      624   143451-pulse   483450-space
从这结果上可以明显的看出这些数值代表脉冲宽度,单位是us

使用irrecod -f -d /dev/lirc0 –disable-namespace来录制配置文件
录制完成后放到 /etc/lric/liricd.conf.d/下边
!注意,这里录制的结果不准确,需要借助上边的命令来获取每一个按键的值,这里只是借用一下配置文件的格式,里边的数字是右对齐
示例:

 # Please take the time to finish this file as described in
 # https://sourceforge.net/p/lirc-remotes/wiki/Checklist/
 # and make it available to others by sending it to
 # <lirc@bartelmus.de>
 #
 # This config file was automatically generated
 # using lirc-0.10.1(default) on Thu Jan  1 01:37:06 1970
 # Command line used: -f -d /dev/lirc0 --disable-namespace
 # Kernel version (uname -r): 5.10.19
 #
 # Remote name (as of config file): elac
 # Brand of remote device, the thing you hold in your hand:
 # Remote device model nr:
 # Remote device info url:
 # Does remote device has a bundled capture device e. g., a
 #     usb dongle? :
 # For bundled USB devices: usb vendor id, product id
 #     and device string (use dmesg or lsusb):
 # Type of device controlled
 #     (TV, VCR, Audio, DVD, Satellite, Cable, HTPC, ...) :
 # Device(s) controlled by this remote:

 begin remote

 name  elac
 flags RAW_CODES|CONST_LENGTH
 eps            30
 aeps          100

 gap          108533

     begin raw_codes

         name Power
        9043     4403      623      531      593      531
         624      531      593      531      624      531
         593      531      624      531      593      536
         594     1680      592     1656      593     1656
         625     1655      593     1666      582     1656
         624     1656      593     1655      625      530
         593      534      621      530      593     1656
         624     1624      624      531      593      530
         624      531      595     1655      623     1655
         593     1656      593      530      624      531
         593     1664      616     1656      593     1656
         593

         name BT
        9041     4407      622      531      593      531
         593      562      593      531      593      531
         625      533      596      525      624      530
         593     1656      624     1656      593     1655
         593     1664      616     1655      593     1656
         593     1656      624     1658      591      530
         624     1656      593      531      624      531
         593      531      593      531      624     1661
         587      530      624     1656      593      531
         593     1687      593     1656      601     1648
         624     1656      593      531      593     1656
         624

     name Vol+
        9013     4437      592      530      593      562
         593      531      624      531      593      531
         594      565      589      530      593      531
         624     1656      593     1656      624     1665
         590     1651      591     1656      624     1655
         593     1656      593     1667      613      531
         593     1656      624     1656      593      531
         593      562      595      528      593     1656
         624      531      593     1656      624      531
         593      530      593     1659      621     1655
         593     1656      593      562      593     1656
         593

     name Vol-
        9044     4436      592      531      624      531
         593      533      622      530      593      531
         593      531      624      531      593      530
         624     1656      593     1661      595     1679
         593     1655      593     1656      624     1656
         593     1667      582     1659      620      530
         593     1656      624     1656      600      524
         624     1656      593      531      593      531
         624      531      593     1656      624      531
         598      530      620     1654      593      531
         624     1625      624     1656      593     1666
         614

     name Pre
        9048     4403      592      562      593      530
         593      562      593      530      593      531
         624      531      593      531      624      531
         593     1661      593     1680      592     1656
         593     1656      624     1656      603     1650
         588     1656      623     1656      593     1656
         624     1662      587     1655      593      531
         624      531      593      531      624     1656
         593      531      631      524      593      530
         593      562      593     1656      593     1656
         624     1663      586      530      624     1624
         624

     name Next
        9022     4425      593      530      624      531
         593      531      624      531      597      527
         623      531      593      531      593      562
         593     1656      593     1656      624     1663
         585     1655      624     1656      593     1656
         593     1656      633     1646      593     1656
         593      562      593     1656      593      530
         624     1658      591      531      593      562
         593      531      624      531      593     1656
         624      499      624     1659      591      530
         624     1656      593     1656      593     1687
         601

     name Play
        9027     4431      592      531      624      531
         593      531      624      531      593      531
         593      562      593      531      624      531
         598     1652      592     1655      624     1656
         593     1656      624     1633      616     1656
         593     1656      624     1624      624     1656
         595      529      624     1656      593      531
         593     1687      593      531      593     1665
         620      526      592      530      624     1656
         593      531      594     1655      624      531
         593     1665      615      531      593     1656
         624

     name Ana1
        9044     4408      621      530      593      530
         624      531      593      531      593      562
         593      531      593      562      593      531
         593     1655      624     1656      593     1655
         597     1654      621     1655      593     1655
         624     1624      624     1665      584      530
         625      530      593     1656      593      562
         593      531      624      499      624      531
         599      525      624     1655      593     1656
         593      562      593     1656      593     1659
         621     1655      593     1656      593     1656
         624

     name Ana2
        9040     4402      656      500      624      499
         656      499      624      499      624      531
         624      499      624      531      624      499
         624     1632      655     1628      589     1650
         593     1655      624     1655      593     1670
         610     1656      593     1656      593      531
         624     1656      596     1655      590      562
         593      531      624      500      624      531
         593      531      624     1656      599      529
         620      530      593     1656      624     1625
         624     1656      593     1662      619     1656
         593

     name Opt1
        9016     4435      624      530      593      531
         624      533      591      531      624      531
         593      531      593      562      593      531
         593     1656      624     1685      564     1655
         624     1624      624     1656      593     1656
         637     1643      593     1656      593      531
         624      531      593     1656      624      531
         596     1653      624      531      593      531
         593      562      593     1656      593     1656
         630      526      591     1656      624      531
         593     1656      593     1656      624     1664
         585

     name Opt2
        9043     4403      655      499      624      499
         656      499      627      497      656      499
         624      499      625      530      624      502
         628     1618      655     1654      601     1619
         623     1624      656     1624      624     1624
         656     1636      613     1625      624      499
         656      499      624      499      656      499
         624     1626      622      531      624      499
         624      531      624     1624      624     1624
         624     1662      618     1624      624      499
         656     1624      624     1624      624     1665
         615

     name Coax
        9015     4439      591      531      624      531
         593      530      624      531      593      531
         593      562      593      531      593      531
         624     1656      593     1656      624     1656
         611     1642      589     1655      624     1656
         593     1656      593     1668      613     1655
         593     1656      593     1656      624      531
         593     1658      622      531      593      530
         593      562      593      531      624      531
         656      468      593     1656      630      525
         592     1655      593     1687      593     1656
         593
     name USB
        9050     4433      593      531      594      561
         593      531      593      531      624      531
         593      531      624      530      593      531
         624     1656      603     1645      593     1656
         624     1656      593     1655      624     1659
         590     1655      593     1656      624      531
         593      531      624      531      593      537
         618      530      593      531      624     1656
         593      531      624     1624      624     1662
         587     1655      624     1655      593     1656
         593     1656      632      523      593     1656
         624

     end raw_codes

 end remote

接下来使用irw来验证刚才录制的是否正确

 # irw
 lircd-0.10.1[432]: Notice: accepted new client on /var/run/lirc/lircd
 lircd-0.10.1[432]: Info: [lirc] protocol is enabled
 0000000000000001 00 Power elac
 0000000000000002 00 BT elac
 0000000000000003 00 Vol+ elac
 0000000000000004 00 Vol- elac
 0000000000000008 00 Ana1 elac
 000000000000000a 00 Opt1 elac
 000000000000000b 00 Opt2 elac
然后在/etc/lirc/目录下创建lircrc配置文件或~/.lircrc
格式如下

 begin
         prog = irexec
         button = Power
         repeat = 0
         config = echo "power"
 end
 begin
         prog = irexec
         button = Vol+
         repeat = 1
         config = amixer -M -c 0 sset 'Headphone',0 1%+ > /dev/null
 end
 begin
         prog = irexec
         button = Vol-
         repeat = 1
         config = amixer -M -c 0 sset 'Headphone',0 1%- > /dev/null
 end
保存

最后就是使用irexec来进行各种操作了,无需编程,到这里可以自由发挥了,想要集成到代码里也很简单,看下图

 # irexec 
 lircd-0.10.1[448]: Notice: accepted new client on /var/run/lirc/lircd
 lircd-0.10.1[448]: Info: [lirc] protocol is enabled
 power
 Simple mixer control 'Headphone',0
 Capabilities: pvolume pvolume-joined pswitch
 Playback channels: Front Left - Front Right
 Limits: Playback 0 - 63
 Mono:
 Front Left: Playback 47 [54%] [-16.00dB] [on]
 Front Right: Playback 47 [54%] [-16.00dB] [on]
 Simple mixer control 'Headphone',0
 Capabilities: pvolume pvolume-joined pswitch
 Playback channels: Front Left - Front Right
 Limits: Playback 0 - 63
 Mono:
 Front Left: Playback 45 [50%] [-18.00dB] [on]
 Front Right: Playback 45 [50%] [-18.00dB] [on]
 power

LIRC处理流程

        +--------+         +-------------+                     +--------+
        |        |         | Linux input |                     | Appli- |
 --->---| kernel |---->----| layer       |---------->----------| cation |
        |        |         |             |  /dev/input/eventX  |        |
        +--------+         +-------------+                     +--------+

        +--------+         +-------------+
        |        |         | Linux input |
 --->---| kernel |---->----| layer       |
        |        |         |             |
        +--------+         +-------------+
                                    |
                                    v
                                    |
                                    |                           +--------+
                            +-------------+                     | Appli- |
                            |    lirc     |---------->----------| cation |-+
                            |             |     lirc socket     |        | |
                            +-------------+                     +--------+ |-+
                                                                    |        | |
                                                                    +--------+ |
                                                                    |        |
                                                                    +--------+

        +--------+         +-------------+                     +--------+
        |        |         |             |                     | Appli- |
 --->---| kernel |---->----|    lirc     |---------->----------| cation |-+
        |        |         |             |     lirc socket     |        | |
        +--------+         +-------------+                     +--------+ |-+
                                                                    |        | |
                                                                    +--------+ |
                                                                    |        |
                                                                    +--------+

通过socket使用lirc,不需要引入任何文件,可以方便的集成到代码里,就是上述第三种方式

struct sigaction act;
char buf[128];
struct sockaddr_un addr;
typedef struct
{
    char addr[32];
    char code[8];
    char type[16];
    char name[16];
} IRW_DATA;
IRW_DATA irw_data;
act.sa_handler = sigusr1;
sigfillset(&act.sa_mask);
act.sa_flags = SA_RESTART; /* don't fiddle with EINTR */
sigaction(SIGUSR1, &act, NULL);
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, "/var/run/lirc/lircd");
fd_lircd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0);
if (fd_lircd == -1)
{
    printf("Create socket failed\n");
}
if (connect(fd_lircd, (struct sockaddr *)&addr, sizeof(addr)) == -1)
{
    printf("Cannot connect to socket %s\n", addr.sun_path);
}
while (1)
{
    // lircd
    if (read(fd_lircd, buf, 128) > 0)
    {
        LOG_D("%s\n", buf);
        char *p = strtok(buf, " ");
        int i = 0;
        while (p)
        {
            // LOG_D("%s\n", p);
            if (i == 0)
                strcpy(irw_data.addr, p);
            else if (i == 1)
                strcpy(irw_data.code, p);
            else if (i == 2)
                strcpy(irw_data.type, p);
            else if (i == 3)
                strcpy(irw_data.name, p);
            p = strtok(NULL, " ");
            i++;
        }
        LOG_D("%s\n", irw_data.type);
        switch ((uint8_t)strtol(irw_data.addr, NULL, 10))
        {
        case Vol_up:
            rotary_encoder_handler(&u8g2, -1);
            break;
        case Vol_down:
            rotary_encoder_handler(&u8g2, 1);
            break;
        case Play:
            rotary_encoder_button_handler(&u8g2);
            break;
        case Bt:
            printf("BT button\n");
            break;
        }
    }
}

测试的硬件
20210829184703.jpg

20210829185143.png

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