read-packet
gabbapeople/simple-byte-protocol/read-packet
Compares the specified "header" byte with the byte received through a UART interface. If a "header" byte is found, read-packet puts the received bytes into a packet of the specified size
read-packet
@/read-packet
Compares the specified "header" byte with the byte received through a UART interface. If a "header" byte is found, read-packet puts the received bytes into a packet of the specified size
IN@/packet
BYTEbyte
An incoming byte
PUSHpulse
Triggers a new "header" match
HEADbyte
A "header" byte value
DONEpulse
Fires if a "header" is found
OUT@/packet
C++ implementation
struct State {
uint8_t readCounter = 0;
bool isHeader = false;
bool firstTimeHeader = false;
};
{{ GENERATED_CODE }}
void evaluate(Context ctx) {
auto state = getState(ctx);
uint8_t head = getValue<input_HEAD>(ctx);
if(isInputDirty<input_PUSH>(ctx)){
uint8_t c = getValue<input_BYTE>(ctx);
if (c == head){
if(!state->firstTimeHeader){
state->isHeader = true;
state->firstTimeHeader = true;
state->readCounter = 0;
}
}
auto _packet = getValue<input_IN>(ctx);
_packet.buffer[state->readCounter] = c;
state->readCounter++;
if(state->readCounter >= _packet.bufferSize){
state->readCounter = 0;
if(state->isHeader){
emitValue<output_OUT>(ctx, _packet);
emitValue<output_DONE>(ctx, 1);
state->isHeader = false;
state->firstTimeHeader = false;
}
}
}
}