94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
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#include "rftransfer.h"
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#include "nrf24l01p.h"
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#include <basic/basic.h>
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#include <core/systick/systick.h>
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void rftransfer_send(uint16_t size, uint8_t *data)
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{
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uint8_t buf[30];
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buf[0] = 'L';
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buf[1] = size >> 8;
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buf[2] = size & 0xFF;
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uint16_t rand = 5; //random_rand16();
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buf[3] = rand >> 8;
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buf[4] = rand & 0xFF;
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nrf_snd_pkt_crc(5,buf); //setup packet
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uint16_t index = 0;
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uint8_t i;
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while(size){
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buf[0] = 'D';
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buf[1] = index >> 8;
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buf[2] = index & 0xFF;
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buf[3] = rand >> 8;
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buf[4] = rand & 0xFF;
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for(i=5; i<30 && size>0; i++,size--){
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buf[i] = *data++;
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}
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index++;
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nrf_snd_pkt_crc(i,buf); //data packet
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}
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uint16_t crc = crc16(data,size);
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buf[0] = 'C';
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buf[1] = crc >> 8;
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buf[2] = crc & 0xFF;
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buf[3] = rand >> 8;
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buf[4] = rand & 0xFF;
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nrf_snd_pkt_crc(5,buf); //crc packet
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}
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uint16_t rftransfer_receive(uint8_t *buffer, uint16_t maxlen, uint16_t timeout)
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{
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uint8_t buf[30];
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uint8_t state = 0;
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uint16_t pos = 0, seq = 0, size = 0, rand = 0, crc = 0;
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int n,i;
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unsigned int currentTick = systickGetTicks();
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unsigned int startTick = currentTick;
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while(currentTick < (startTick+timeout) ){//this fails if either overflows
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n = nrf_rcv_pkt_time(10, 30, buf);
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switch(state){
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case 0:
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if( n == 5 && buf[0] == 'L' ){
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size = (buf[1] << 8) | buf[2];
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rand = (buf[3] << 8) | buf[4];
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seq = 0;
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pos = 0;
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if( size <= maxlen )
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state = 1;
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}
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break;
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case 1:
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if( n > 5 && buf[0] == 'D' && ((buf[3]<<8)|buf[4])==rand ){
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if( seq == ((buf[1]<<8)|buf[2]) ){
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if( (pos + n - 5)<maxlen ){
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for(i=5; i<n; i++,pos++){
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buffer[pos] = buf[i];
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}
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}
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}
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}
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if( pos == size ){
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crc = crc16(buffer, size);
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state = 2;
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}
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break;
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case 2:
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if( n == 5 && buf[0] == 'C' && ((buf[3]<<8)|buf[4])==rand){
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if( crc == ((buf[1]<<8)|buf[2]) ){
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return size;
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}else{
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state = 0;
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}
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}
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break;
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};
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}
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return 0;
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}
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