crashtest-r0ket/firmware/funk/mesh.c

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#include <sysdefs.h>
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#include <sysinit.h>
#include <string.h>
#include "basic/basic.h"
#include "funk/mesh.h"
#include "funk/nrf24l01p.h"
#include "basic/byteorder.h"
#include "basic/random.h"
char meshgen=0; // Generation
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char meshincctr=0;
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MPKT meshbuffer[MESHBUFSIZE];
uint32_t const meshkey[4] = {
0x00000042, 0x000005ec, 0x00000023, 0x00000005
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};
struct NRF_CFG oldconfig;
void initMesh(void){
for(int i=0;i<MESHBUFSIZE;i++){
meshbuffer[i].flags=MF_FREE;
};
memset(meshbuffer[0].pkt,0,MESHPKTSIZE);
meshbuffer[0].pkt[0]='T';
MO_TIME_set(meshbuffer[0].pkt,getSeconds());
meshbuffer[0].flags=MF_USED;
};
MPKT * meshGetMessage(uint8_t type){
int free=-1;
for(int i=0;i<MESHBUFSIZE;i++){
if ( ((meshbuffer[i].flags&MF_USED)==0) && free<0 )
free=i;
if ( (meshbuffer[i].flags&MF_USED) &&
(MO_TYPE(meshbuffer[i].pkt) == type)){
free=i;
break;
};
};
if(free==-1){ // Buffer full. Ah well. Kill a random packet
free=1; // XXX: GetRandom()?
meshbuffer[free].flags=MF_FREE;
};
if(meshbuffer[free].flags==MF_FREE){
memset(&meshbuffer[free],0,sizeof(MPKT));
MO_TYPE_set(meshbuffer[free].pkt,type);
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MO_GEN_set(meshbuffer[free].pkt,meshgen);
meshbuffer[free].flags=MF_USED;
};
return &meshbuffer[free];
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};
void mesh_cleanup(void){
time_t now=getSeconds();
for(int i=1;i<MESHBUFSIZE;i++){
if(meshbuffer[i].flags&MF_USED){
if (MO_GEN(meshbuffer[i].pkt)<meshgen)
meshbuffer[i].flags=MF_FREE;
if (MO_TYPE(meshbuffer[i].pkt)>='a' &&
MO_TYPE(meshbuffer[i].pkt)<='z'){
;
}else{
if (MO_TIME(meshbuffer[i].pkt)<now)
meshbuffer[i].flags=MF_FREE;
if (MO_TIME(meshbuffer[i].pkt)-now>SECS_DAY)
meshbuffer[i].flags=MF_FREE;
};
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};
};
};
void mesh_recvloop(void){
__attribute__ ((aligned (4))) uint8_t buf[32];
int len;
int recvend=M_RECVTIM/SYSTICKSPEED+getTimer();
int pktctr=0;
nrf_config_get(&oldconfig);
nrf_set_channel(MESH_CHANNEL);
nrf_set_rx_mac(0,MESHPKTSIZE,strlen(MESH_MAC),(uint8_t*)MESH_MAC);
mesh_cleanup();
nrf_rcv_pkt_start();
do{
len=nrf_rcv_pkt_poll_dec(sizeof(buf),buf,meshkey);
// Receive
if(len<=0){
delayms_power(10);
continue;
};
pktctr++;
if(MO_GEN(buf)>meshgen){
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if(meshgen)
meshgen++;
else
meshgen=MO_GEN(buf);
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_timet=0;
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meshincctr=0;
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};
if(MO_TYPE(buf)=='T'){
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time_t toff=MO_TIME(buf)-((getTimer()+(600/SYSTICKSPEED))/(1000/SYSTICKSPEED));
if (toff>_timet){ // Do not live in the past.
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_timet = toff;
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meshincctr++;
};
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continue;
};
// Safety: Truncate ascii packets by 0-ing the CRC
buf[MESHPKTSIZE-2]=0;
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// Store packet in a same/free slot
MPKT* mpkt=meshGetMessage(MO_TYPE(buf));
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// Skip locked packet
if(mpkt->flags&MF_LOCK)
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continue;
// only accept newer/better packets
if(mpkt->flags==MF_USED)
if(MO_TIME(buf)<MO_TIME(mpkt->pkt))
continue;
memcpy(mpkt->pkt,buf,MESHPKTSIZE);
mpkt->flags=MF_USED;
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}while(getTimer()<recvend || pktctr>MESHBUFSIZE);
nrf_rcv_pkt_end();
nrf_config_set(&oldconfig);
}
void mesh_sendloop(void){
int ctr=0;
__attribute__ ((aligned (4))) uint8_t buf[32];
int status;
nrf_config_get(&oldconfig);
nrf_set_channel(MESH_CHANNEL);
nrf_set_tx_mac(strlen(MESH_MAC),(uint8_t*)MESH_MAC);
// Update [T]ime packet
MO_TIME_set(meshbuffer[0].pkt,getSeconds());
MO_GEN_set(meshbuffer[0].pkt,meshgen);
for (int i=0;i<MESHBUFSIZE;i++){
if(!meshbuffer[i].flags&MF_USED)
continue;
if(meshbuffer[i].flags&MF_LOCK)
continue;
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ctr++;
memcpy(buf,meshbuffer[i].pkt,MESHPKTSIZE);
status=nrf_snd_pkt_crc_encr(MESHPKTSIZE,buf,meshkey);
//Check status? But what would we do...
};
nrf_config_set(&oldconfig);
};
void mesh_systick(void){
static int rcvctr=0;
static int sendctr=0;
if(rcvctr--<0){
push_queue(&mesh_recvloop);
rcvctr=M_RECVINT/SYSTICKSPEED/2;
rcvctr+=getRandom()%(rcvctr*2);
};
if(sendctr--<0){
push_queue(&mesh_sendloop);
sendctr=M_SENDINT/SYSTICKSPEED/2;
sendctr+=getRandom()%(sendctr*2);
};
};