测试红外遥控键值
前面测试lvgl已经可以在hdmi屏幕上输出显示，这一步该测试红外了。
1.根据原理图确定引脚
先确定红外模块的引脚，红外部分原理图：
IR_RX对应部分：
所以这里IR的pin对应的是PB12，这里有点问题不知道是不是图不对，用PB12测试一直读不到值，用的PG16才行，下面以PG16进行测试说明。
2. 修改设备树
在sdk下找到设备树文件，做如下修改
1. 修改board.dts(路径/home/allwinner/Desktop/tina-d1-h/device/config/chips/d1-h/configs/nezha/linux-5.4/board.dts)中s_cir0部分,pins改为PG16：
s_cir0_pins_a: s_cir@0 {
pins = "PG16";
function = "ir";
drive-strength = <10>;
bias-pull-up;
};
s_cir0_pins_b: s_cir@1 {
pins = "PG16";
function = "gpio_in";
};
···
;s_cir0 status改为okay
&s_cir0 {
pinctrl-names = "default", "sleep";
pinctrl-0 = <&s_cir0_pins_a>;
pinctrl-1 = <&s_cir0_pins_b>;
status = "okay";
};
2. sun20iw1p1.dtsi(路径：/home/allwinner/Desktop/tina-d1-h/lichee/linux-5.4/arch/riscv/boot/dts/sunxi/sun20iw1p1.dtsi),将S_CIR开启:
s_cir0: s_cir@7040000 {
compatible = "allwinner,s_cir";
reg = <0x0 0x07040000 0x0 0x400>;
interrupts-extended = <&plic0 167 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&r_ccu CLK_R_APB0_BUS_IRRX>, <&dcxo24M>, <&r_ccu CLK_R_APB0_IRRX>;
clock-names = "bus", "pclk", "mclk";
resets = <&r_ccu RST_R_APB0_BUS_IRRX>;
supply = "";
supply_vol = "";
status = "okay";
};
3. 修改menuconfig
在虚拟机shell下，输入：make kernel_menuconfig，进入Device Drivers > Remote Controller support > Remote controller decoders ，选择如下：
.config - Linux/riscv 5.4.61 Kernel Configuration
> Device Drivers > Remote Controller support > Remote controller decoders ────────────────────────────────────
┌────────────────────────────────────── Remote controller decoders ───────────────────────────────────────┐
│ Arrow keys navigate the menu. <Enter> selects submenus ---> (or empty submenus ----). Highlighted │
│ letters are hotkeys. Pressing <Y> includes, <N> excludes, <M> modularizes features. Press <Esc><Esc> │
│ to exit, <?> for Help, </> for Search. Legend: [*] built-in [ ] excluded <M> module < > module │
│ capable │
│ ┌─────────────────────────────────────────────────────────────────────────────────────────────────────┐ │
│ │ --- Remote controller decoders │ │
│ │ <*> Enable IR raw decoder for the NEC protocol │ │
│ │ < > Enable IR raw decoder for the RC-5 protocol │ │
│ │ < > Enable IR raw decoder for the RC6 protocol │ │
│ │ < > Enable IR raw decoder for the JVC protocol │ │
│ │ < > Enable IR raw decoder for the Sony protocol │ │
│ │ < > Enable IR raw decoder for the Sanyo protocol │ │
│ │ < > Enable IR raw decoder for the Sharp protocol │ │
│ │ < > Enable IR raw decoder for the MCE keyboard/mouse protocol │ │
│ │ < > Enable IR raw decoder for the XMP protocol │ │
│ │ < > Enable IR raw decoder for the iMON protocol │ │
│ │ < > Enable IR raw decoder for the RC-MM protocol │ │
│ │ │ │
手头的红外遥控器是NEC协议，就选择第一个了
然后返回进入Device Drivers > Remote Controller support > Remote Controller devices，选择如下：
.config - Linux/riscv 5.4.61 Kernel Configuration
> Device Drivers > Remote Controller support > Remote Controller devices ─────────────────────────────────────
┌─────────────────────────────────────── Remote Controller devices ───────────────────────────────────────┐
│ Arrow keys navigate the menu. <Enter> selects submenus ---> (or empty submenus ----). Highlighted │
│ letters are hotkeys. Pressing <Y> includes, <N> excludes, <M> modularizes features. Press <Esc><Esc> │
│ to exit, <?> for Help, </> for Search. Legend: [*] built-in [ ] excluded <M> module < > module │
│ capable │
│ ┌─────────────────────────────────────────────────────────────────────────────────────────────────────┐ │
│ │ --- Remote Controller devices │ │
│ │ < > ATI / X10 based USB RF remote controls │ │
│ │ < > Hisilicon hix5hd2 IR remote control │ │
│ │ < > SoundGraph iMON Receiver and Display │ │
│ │ < > SoundGraph iMON Receiver (early raw IR models) │ │
│ │ < > Windows Media Center Ed. eHome Infrared Transceiver │ │
│ │ < > RedRat3 IR Transceiver │ │
│ │ < > SPI connected IR LED │ │
│ │ < > Streamzap PC Remote IR Receiver │ │
│ │ < > IgorPlug-USB IR Receiver │ │
│ │ < > IguanaWorks USB IR Transceiver │ │
│ │ < > TechnoTrend USB IR Receiver │ │
│ │ < > Remote Control Loopback Driver │ │
│ │ < > GPIO IR remote control │ │
│ │ < > GPIO IR Bit Banging Transmitter │ │
│ │ < > PWM IR transmitter │ │
│ │ < > SUNXI IR remote control │ │
│ │ <*> SUNXI IR RX remote control │ │
│ │ <*> SUNXI IR TX remote control │ │
│ │ < > Homebrew Serial Port Receiver │ │
│ │ < > Built-in SIR IrDA port │ │
│ │ < > Xbox DVD Movie Playback Kit │ │
保存退出，然后make编译，打包，按前面烧录的步骤烧录镜像
4. 测试红外驱动
上一步烧录完成后，在串口终端中，输入下面内容后回车
root@TinaLinux:/# cat proc/bus/input/devices
如果前面配置正确，此时应该能看到挂载的红外设备，驱动加载正常
root@TinaLinux:/# cat proc/bus/input/devices
I: Bus=0019 Vendor=0001 Product=0001 Version=0100
N: Name="sunxi-keyboard"
P: Phys=sunxikbd/input0
S: Sysfs=/devices/virtual/input/input0
U: Uniq=
H: Handlers=kbd event0
B: PROP=0
B: EV=3
B: KEY=100000000 0 0 100000000800 4000000000000 10000000
I: Bus=0019 Vendor=0001 Product=0001 Version=0100
N: Name="sunxi-ir"
P: Phys=sunxi-ir/input0
S: Sysfs=/devices/platform/soc@3000000/7040000.s_cir/rc/rc0/s_cir_rx
U: Uniq=
H: Handlers=kbd event1
B: PROP=20
B: EV=100017
B: KEY=2
B: REL=3
B: MSC=10
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="audiocodec sunxi Audio Jack"
P: Phys=ALSA
S: Sysfs=/devices/platform/soc@3000000/2030340.sound/sound/card0/input2
U: Uniq=
H: Handlers=kbd event2
B: PROP=0
B: EV=23
B: KEY=40 0 0 0 0 0 400000000 0 c000000000000 0
B: SW=14
上面红外设备节点事件是键盘event1
SDK的固件下有个getevent可以测试下红外输入，用法如下
root@TinaLinux:/# getevent -h
Usage: getevent [-t] [-n] [-s switchmask] [-S] [-v [mask]] [-d] [-p] [-i] [-l] [-q] [-c count] [-r] [device]
-t: show time stamps
-n: don't print newlines
-s: print switch states for given bits
-S: print all switch states
-v: verbosity mask (errs=1, dev=2, name=4, info=8, vers=16, pos. events=32, props=64)
-d: show HID descriptor, if available
-p: show possible events (errs, dev, name, pos. events)
-i: show all device info and possible events
-l: label event types and names in plain text
-q: quiet (clear verbosity mask)
-c: print given number of events then exit
-r: print rate events are received
根据提示，输入getevent -l /dev/input/event1,处于等待输入状态，此时按红外遥控器，日志如下：
root@TinaLinux:/# getevent -l /dev/input/event1
poll 2, returned 1
EV_MSC MSC_SCAN 00000009
poll 2, returned 1
EV_SYN SYN_REPORT 00000000
poll 2, returned 1
EV_MSC MSC_SCAN 00000009
poll 2, returned 1
EV_SYN SYN_REPORT 00000000
poll 2, returned 1
EV_MSC MSC_SCAN 00000009
poll 2, returned 1
EV_SYN SYN_REPORT 00000000
poll 2, returned 1
EV_MSC MSC_SCAN 00000009
poll 2, returned 1
EV_SYN SYN_REPORT 00000000
poll 2, returned 1
EV_MSC MSC_SCAN 00000015
poll 2, returned 1
EV_SYN SYN_REPORT 00000000
poll 2, returned 1
EV_MSC MSC_SCAN 00000015
poll 2, returned 1
EV_SYN SYN_REPORT 00000000
poll 2, returned 1
EV_MSC MSC_SCAN 00000040
poll 2, returned 1
EV_SYN SYN_REPORT 00000000
poll 2, returned 1
EV_MSC MSC_SCAN 00000040
poll 2, returned 1
EV_SYN SYN_REPORT 00000000
poll 2, returned 1
EV_MSC MSC_SCAN 00000046
poll 2, returned 1
EV_SYN SYN_REPORT 00000000
poll 2, returned 1
EV_MSC MSC_SCAN 00000046
poll 2, returned 1
EV_SYN SYN_REPORT 00000000
poll 2, returned 1
EV_MSC MSC_SCAN 00000046
poll 2, returned 1
EV_SYN SYN_REPORT 00000000
poll 2, returned 1
EV_MSC MSC_SCAN 00000046
poll 2, returned 1
EV_SYN SYN_REPORT 00000000
到这里，有键值出来，说明前面加载驱动，和配置引脚都没问题，下面可以写测试程序了
5. 编写红外测试程序
根据前面测试，采用节点事件event1可以获取红外键值，那么测试程序ir_test.c可以如下编写：
#include <stdio.h>
#include <linux/input.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/time.h>
#include <limits.h>
#include <unistd.h>
#include <signal.h>
#define DEV_PATH "/dev/input/event1" //difference is possible
const int key_exit = 102;
static int keys_fd = 0;
unsigned int test_keyboard(const char * event_file)
{
int code = 0, i;
struct input_event data={0};
keys_fd=open(DEV_PATH, O_RDONLY);
if(keys_fd <= 0)
{
printf("open %s error!\n", DEV_PATH);
return -1;
}
fcntl(keys_fd,F_SETFL,O_NONBLOCK);
for(;;)
{
read(keys_fd, &data, sizeof(data));
if(data.value){
printf("%d\r\n",data.value);
code = data.value;
}
}
close(keys_fd);
return 0;
}
int main(int argc,const char *argv[])
{
int rang_low = 0, rang_high = 0;
return test_keyboard(DEV_PATH);
}
上面fcntl(keys_fd,F_SETFL,O_NONBLOCK);主要是测试非阻塞读取，后面lvgl用到，这里放进来了
在shell下编译
riscv64-unknown-linux-gnu-gcc ir_test.c -o ir_test
然后adb推到板子上：
sudo adb push ir_test .
在串口终端下执行并测试：
root@TinaLinux:/# ./ir_test
70
70
70
70
71
71
71
71
71
71
驱动测试ok，后面就可以组装到前面的lvgl程序里了