在Neza-D1上使用红外接收头做为输入
开发环境配置
我的系统是在VirtualBox里跑的ubuntu18.04
a. 到平头哥官网下载riscv64-linux-x86_64-20210512.tar.gz交叉编译工具
b. sudo mkdir /opt/riscv64-linux-x86_64-20210512
c. tar -xzvf riscv64-linux-x86_64-20210512.tar.gz -C /opt/riscv64-linux-x86_64-20210512
d. vim /etc/bash.bashrc 添加PATH="$PATH:/opt/riscv64-linux-x86_64-20210512/bin"
e. source /etc/bash.bashrc 使之生效
f. 终端输入riscv64-unknown-linux-gnu-gcc -v 出现版本信息说明外部工具链接配置好了
D1芯片本身有硬件ir-tx ir-rx,但在开发板上通过扩展IO引出的只有IR-RX，IR-TX用不了，被I2C2占用了，只有用IO来发射红外信号了
设备对配置
发射引脚，使用的是GPIO 需要在内核打开GPIO IR Bit Banging
ir_send {
compatible = “gpio-ir-tx”;
gpios = <&pio 3 22 GPIO_ACTIVE_HIGH>; /* PD22 */
status = “okay”;
};
接收引脚
&s_cir0 {
pinctrl-names = “default”, “sleep”;
pinctrl-0 = <&s_cir0_pins_a>;
pinctrl-1 = <&s_cir0_pins_b>;
linux,rc-map-name = “rc-tbs-nec”;
status = “okay”;
};
下边是注册过程
[ 1.719737] i2c /dev entries driver
[ 1.723748] IR NEC protocol handler initialized
[ 1.728825] IR RC5(x/sz) protocol handler initialized
[ 1.735217] rc rc0: GPIO IR Bit Banging Transmitter as /devices/platform/soc@3000000/soc@3000000:ir_send/rc/rc0
[ 1.746722] rc rc0: lirc_dev: driver gpio-ir-tx registered at minor = 0, no receiver, raw IR transmitter
[ 1.758445] sunxi_ir_startup: get ir protocol failed
[ 1.758467] (NULL device *): deviceless supply not found, using dummy regulator
[ 1.772394] Registered IR keymap rc_map_sunxi
[ 1.777404] rc rc1: sunxi-ir as /devices/platform/soc@3000000/7040000.s_cir/rc/rc1
[ 1.786130] rc rc1: lirc_dev: driver sunxi-rc-recv registered at minor = 1, raw IR receiver, no transmitter
[ 1.797263] input: sunxi-ir as /devices/platform/soc@3000000/7040000.s_cir/rc/rc1/s_cir_rx查看系统 /dev下的设备
# ls /dev/lirc*
/dev/lirc1 /dev/lirc1 /dev/lircd硬件电路请查看附件
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: sunxi-keyboard /dev/input/event1: soc@3000000:rotary /dev/input/event2: sunxi-ir /dev/input/event3: audiocodec sunxi Audio Jack /dev/input/event4: soc@3000000:gpio_keys /dev/input/event5: ns2009_ts此时如果用evtest测试按键是没有任何反应的，因为keymap我们没有修改成自己用的遥控器，当然就不上报事件了，但不影响后续操作
我们可以用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/lric1 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/lirc1 Using driver default on device /dev/lirc1 Trying device: /dev/lirc1 Using device: /dev/lirc1 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/lirc1 –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/lirc1 --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 . . . . . 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 volume up click 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] volume down click 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]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;
}
}
}下边开始向外发射IR信号,发射就使用之前录制的配置文件
irsend SEND_ONCE elac power