72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
#include "usart.h"
|
|
#include "rf.h"
|
|
#include "buffer.h"
|
|
#include "config.h"
|
|
|
|
/*
|
|
* Timer2 interrupt in 16kHz. Samples the RF Rx data pin
|
|
*/
|
|
ISR(TIMER2_COMPA_vect) {
|
|
|
|
if ( !IS_RADIO_RECIEVER_ON() ) { //if no Radio Rx should be performed
|
|
return;
|
|
}
|
|
|
|
uint8_t bit = RX_PIN_READ();
|
|
|
|
//will store "lows" on even buffer addresses and "highs" on odd buffer addresses
|
|
if ( ( ((uintptr_t)bufferWriteP) & 0x1 ) != bit ) { //compare the bit and the buffer pointer address. true if one is odd and one is even.
|
|
//step the buffer pointer
|
|
if ( bufferWriteP+1 > RF_rxBufferEndP ) {
|
|
*RF_rxBufferStartP = 1; //reset the next data point before going there
|
|
bufferWriteP = RF_rxBufferStartP;
|
|
} else {
|
|
*(bufferWriteP+1) = 1; //reset the next data point before going there
|
|
++bufferWriteP;
|
|
}
|
|
} else {
|
|
if ( *bufferWriteP < 255 ) { //Do not step the value if it already is 255 (max value)
|
|
++(*bufferWriteP); //step the buffer value
|
|
}
|
|
}
|
|
|
|
};//end timer2 interrupt
|
|
|
|
|
|
void setup() {
|
|
|
|
Serial.begin(9600);
|
|
|
|
setupPins();
|
|
|
|
//setup timer2 interrupt at 16kHz for RF sampling
|
|
cli(); //stop interrupts
|
|
TCCR2A = 0; // set entire TCCR2A register to 0
|
|
TCCR2B = 0; // same for TCCR2B
|
|
TCNT2 = 0; //initialize counter value to 0
|
|
OCR2A = 124; // = ( (16000000Hz) / (16000Hz*8prescaler) ) - 1 (must be <256)
|
|
TCCR2A |= (1 << WGM21); // turn on CTC mode
|
|
TCCR2B |= (1 << CS21); // Set CS21 bit for 8 prescaler
|
|
TIMSK2 |= (1 << OCIE2A); // enable timer compare interrupt
|
|
sei(); //allow interrupts
|
|
|
|
//reset buffer just to be sure
|
|
for (uint8_t* p = RF_rxBufferStartP; p <= RF_rxBufferEndP; ++p) {
|
|
*p = 0;
|
|
}
|
|
|
|
Serial.println(F("+V2"));
|
|
|
|
ACTIVATE_RADIO_RECEIVER();
|
|
|
|
};//end setup
|
|
|
|
void loop() {
|
|
|
|
//Receive and execute command over serial
|
|
parseSerialForCommand();
|
|
|
|
//Receive signal over air and send it over serial
|
|
parseRadioRXBuffer();
|
|
|
|
};//end loop
|