Rock/ir

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The Radxa Rock comes with IR sensor(between the uSD card and USB otg port). This page describe how to use and configure the remote to work properly on RR.

Kernel Level

The IR driver only supports NEC Encode format. Below is the instructions of how to add you IR remote to send the right key code in Linux kernel.

There is just one file related "kernel/drivers/input/remotectl/rkxx_remotectl.c"

Do as follows

1、Add an array as follow:

static struct rkxx_remote_key_table remote_key_table_41C8[] = {
 {0x38, KEY_VOLUMEUP},
 {0xb8, KEY_VOLUMEDOWN},
 {0x58, KEY_MENU},
 {0xd0, KEY_REPLY},
 {0x48, KEY_BACK},
 {0x98, KEY_BACK},
 {0x50, KEY_UP},
 {0x30, KEY_DOWN},
 {0xc8, KEY_LEFT},
 {0xc0, KEY_RIGHT},
 {0x40, KEY_REPLY},
 {0x80, KEY_SEARCH}, 
}; 

The first column is the IR key value,the second column is the corresponding key value.

2、Add one item in

 "static struct rkxx_remotectl_button remotectl_button[]"

For example：

   {
       .usercode = 0x41c8,
        .nbuttons = 12,
         .key_table = &remote_key_table_41C8[0],
   }, 

The first is usercode, every IR has a usercode; the second is the buttons number the third is the first address of the array added in the 1st step.

How to get the usercode and IR key value In the remotectl_do_something func

      case RMC_USERCODE:
       {
           ddata->scanData <<= 1;
           ddata->count ++;
           if ((TIME_BIT1_MIN < ddata->period) && (ddata->period < TIME_BIT1_MAX)){
               ddata->scanData |= 0x01;
           }
           if (ddata->count == 0x10){//16 bit user code
              // printk("u=0x%x\n",((ddata->scanData)&0xFFFF));
               if (remotectl_keybdNum_lookup(ddata)){
                   ddata->state = RMC_GETDATA;
                   ddata->scanData = 0;
                   ddata->count = 0;
               }else{
                  ddata->state = RMC_PRELOAD;
               }
           }
       }	

Open the printk code to get the usercode,then add remotectl_button array with the usercode and the buttons number

      case RMC_GETDATA:
      {
           ddata->count ++;
           ddata->scanData <<= 1;
           if ((TIME_BIT1_MIN < ddata->period) && (ddata->period < TIME_BIT1_MAX)){
               ddata->scanData |= 0x01;
           }	
           if (ddata->count == 0x10){
              // printk(KERN_ERR "d=%x\n",(ddata->scanData&0xFFFF));
               if ((ddata->scanData&0x0ff) == ((~ddata->scanData >> 8)&0x0ff)){
                   if (remotectl_keycode_lookup(ddata)){
                       ddata->press = 1;
                                        ...
                                         }
                                      ...
                                    }
                                 ...
                             }
                    }    

Open the printk code ,you can get the IR key value

Note:

1. you will get four number in hex(0x) format, the first two number is we needed ,the last two number is just used for check!

1. Don't leave much log in code,too much log will result in the ir doesn't work.