91 lines
1.8 KiB
C
91 lines
1.8 KiB
C
#include <stdint.h>
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#include "funk/openbeacon.h"
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#include "funk/nrf24l01p.h"
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#include "basic/byteorder.h"
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#include "sysdefs.h"
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#include "filesystem/ff.h"
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//const uint32_t key[4] = {0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF};
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const uint32_t key[4] = { 0xB4595344,0xD3E119B6,0xA814D0EC,0xEFF5A24E };
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const uint8_t useencryption = 1;
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const uint8_t mac[5] = {1,2,3,2,1};
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uint32_t oid = 0;
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uint32_t seq = 0;
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uint8_t strength = 0;
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void openbeaconSave()
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{
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FIL file;
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BYTE buf[4];
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UINT readbytes;
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if( f_open(&file, "beacon", FA_OPEN_ALWAYS|FA_WRITE) )
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return;
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uint32touint8p(seq, buf);
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if( f_write(&file, buf, 4, &readbytes) )
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return;
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f_close(&file);
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}
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void openbeaconRead()
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{
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FIL file;
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BYTE buf[4];
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UINT readbytes;
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if( f_open(&file, "beacon", FA_OPEN_EXISTING|FA_READ) )
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return;
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if( f_read(&file, buf, 4, &readbytes) )
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return;
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seq = uint8ptouint32(buf);
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f_close(&file);
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}
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void openbeaconSetup(uint32_t id)
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{
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oid = id;
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strength = 0;
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openbeaconRead();
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}
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uint8_t openbeaconSendPacket(uint32_t id, uint32_t seq,
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uint8_t flags, uint8_t strength)
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{
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uint8_t buf[32];
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buf[0]=0x10; // Length: 16 bytes
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buf[1]=0x17; // Proto - fixed at 0x17?
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buf[2]=flags;
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buf[3]=strength*85; // Send intensity
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uint32touint8p(seq, buf+4);
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uint32touint8p(id, buf+8);
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buf[12]=0xff; // salt (0xffff always?)
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buf[13]=0xff;
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return nrf_snd_pkt_crc_encr(16,buf,useencryption?key:NULL);
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}
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uint8_t openbeaconSend(void)
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{
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uint8_t status;
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nrf_set_strength(strength);
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nrf_set_tx_mac(sizeof(mac), mac);
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status = openbeaconSendPacket(oid, seq++, 0xFF, strength++);
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if( strength == 4 )
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strength = 0;
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if( seq % OPENBEACON_SAVECOUNTER == 0 )
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openbeaconSave();
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return status;
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}
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