crashtest-r0ket/firmware/funk/openbeacon.c

105 lines
2.0 KiB
C

#include <stdint.h>
#include "funk/openbeacon.h"
#include "funk/nrf24l01p.h"
#include "basic/byteorder.h"
#include "sysdefs.h"
#include "filesystem/ff.h"
#include "basic/uuid.h"
//const uint32_t key[4] = {0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF};
#include "SECRETS"
const uint8_t useencryption = 1;
const uint8_t mac[5] = {1,2,3,2,1};
volatile uint32_t oid = 0;
volatile uint32_t seq = 0;
volatile uint8_t strength = 0;
void openbeaconShutdown(void)
{
openbeaconSave(seq);
}
void openbeaconSaveBlock(void)
{
openbeaconSave(seq + OPENBEACON_SAVE + 1);
}
void openbeaconSave(uint32_t s)
{
FIL file;
BYTE buf[4];
UINT readbytes;
if( f_open(&file, "beacon.cfg", FA_OPEN_ALWAYS|FA_WRITE) )
return;
uint32touint8p(s, buf);
if( f_write(&file, buf, 4, &readbytes) )
return;
f_close(&file);
}
void openbeaconRead()
{
FIL file;
BYTE buf[4];
UINT readbytes;
if( f_open(&file, "beacon.cfg", FA_OPEN_EXISTING|FA_READ) )
return;
if( f_read(&file, buf, 4, &readbytes) )
return;
seq = uint8ptouint32(buf);
f_close(&file);
}
void openbeaconSetup(void)
{
oid = GetUUID32();
strength = 0;
openbeaconRead();
openbeaconSaveBlock();
}
uint8_t openbeaconSendPacket(uint32_t id, uint32_t seq,
uint8_t flags, uint8_t strength)
{
uint8_t buf[32];
buf[0]=0x10; // Length: 16 bytes
buf[1]=0x17; // Proto - fixed at 0x17?
buf[2]=flags;
buf[3]=strength*85; // Send intensity
uint32touint8p(seq, buf+4);
uint32touint8p(id, buf+8);
buf[12]=0xff; // salt (0xffff always?)
buf[13]=0xff;
return nrf_snd_pkt_crc_encr(16,buf,useencryption?openbeaconkey:NULL);
}
uint8_t openbeaconSend(void)
{
uint8_t status;
nrf_set_channel(OPENBEACON_CHANNEL);
nrf_set_strength(strength);
nrf_set_tx_mac(sizeof(mac), mac);
status = openbeaconSendPacket(oid, seq, 0xFF, strength++);
if( strength == 4 )
strength = 0;
if( (seq++ & OPENBEACON_SAVE) == OPENBEACON_SAVE )
openbeaconSaveBlock();
return status;
}