crashtest-r0ket/firmware/funk/openbeacon.c

86 lines
1.7 KiB
C

#include <stdint.h>
#include "funk/openbeacon.h"
#include "funk/nrf24l01p.h"
#include "basic/byteorder.h"
#include "sysdefs.h"
#include "filesystem/ff.h"
const uint32_t key[4] = {0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF};
const uint8_t enctoggle = 0;
uint32_t oid = 0;
uint32_t ctr = 0;
uint8_t strength = 0;
void openbeaconSave()
{
FIL file; /* File object */
BYTE buf[4];
UINT readbytes;
if( f_open(&file, "beacon", FA_OPEN_ALWAYS|FA_WRITE) )
return;
uint32touint8p(ctr, buf);
if( f_write(&file, buf, 4, &readbytes) )
return;
f_close(&file);
}
void openbeaconRead()
{
FIL file; /* File object */
BYTE buf[4];
UINT readbytes;
if( f_open(&file, "beacon", FA_OPEN_EXISTING|FA_READ) )
return;
if( f_read(&file, buf, 4, &readbytes) )
return;
ctr = uint8ptouint32(buf);
}
void openbeaconSetup(uint32_t id)
{
oid = id;
strength = 0;
openbeaconRead();
}
void openbeaconSendPacket(uint32_t id, uint32_t ctr, uint8_t flags, uint8_t strength)
{
uint8_t buf[32];
int status;
buf[0]=0x10; // Length: 16 bytes
buf[1]=0x17; // Proto - fixed at 0x17?
buf[2]=flags;
buf[3]=strength*85; // Send intensity
uint32touint8p(ctr, buf+4);
uint32touint8p(id, buf+8);
buf[12]=0xff; // salt (0xffff always?)
buf[13]=0xff;
status=nrf_snd_pkt_crc_encr(16,buf,enctoggle?key:NULL);
}
void openbeaconSend(void)
{
//uint8_t tmp = nrfgetstrength();
uint8_t tmp = 3;
nrf_set_strength(strength);
openbeaconSendPacket(oid, ctr++, 0xFF, strength++);
if( strength == 4 )
strength = 0;
if( ctr % OPENBEACON_SAVECOUNTER == 0 )
openbeaconSave();
//maybe this produces timing problems?
nrf_set_strength(tmp);
}