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RF24.cpp
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RF24.cpp
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/*
Copyright (C) 2011 J. Coliz <maniacbug@ymail.com>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation.
*/
#include "nRF24L01.h"
#include "RF24_config.h"
#include "RF24.h"
/****************************************************************************/
void RF24::csn(bool mode)
{
// Minimum ideal SPI bus speed is 2x data rate
// If we assume 2Mbs data rate and 16Mhz clock, a
// divider of 4 is the minimum we want.
// CLK:BUS 8Mhz:2Mhz, 16Mhz:4Mhz, or 20Mhz:5Mhz
#ifdef ARDUINO
#if ( !defined( __AVR_ATtiny85__ ) && !defined( __AVR_ATtiny84__) && !defined (__arm__) ) || defined (CORE_TEENSY)
SPI.setBitOrder(MSBFIRST);
SPI.setDataMode(SPI_MODE0);
SPI.setClockDivider(SPI_CLOCK_DIV2);
#endif
#endif
#if !defined (__arm__) || defined (CORE_TEENSY)
digitalWrite(csn_pin,mode);
#endif
}
/****************************************************************************/
void RF24::ce(bool level)
{
digitalWrite(ce_pin,level);
}
/****************************************************************************/
uint8_t RF24::read_register(uint8_t reg, uint8_t* buf, uint8_t len)
{
uint8_t status;
#if defined (__arm__) && !defined ( CORE_TEENSY )
status = SPI.transfer(csn_pin, R_REGISTER | ( REGISTER_MASK & reg ), SPI_CONTINUE );
while ( len-- > 1 ){
*buf++ = SPI.transfer(csn_pin,0xff, SPI_CONTINUE);
}
*buf++ = SPI.transfer(csn_pin,0xff);
#else
csn(LOW);
status = SPI.transfer( R_REGISTER | ( REGISTER_MASK & reg ) );
while ( len-- ){
*buf++ = SPI.transfer(0xff);
}
csn(HIGH);
#endif
return status;
}
/****************************************************************************/
uint8_t RF24::read_register(uint8_t reg)
{
#if defined (__arm__) && !defined ( CORE_TEENSY )
SPI.transfer(csn_pin, R_REGISTER | ( REGISTER_MASK & reg ) , SPI_CONTINUE);
uint8_t result = SPI.transfer(csn_pin,0xff);
#else
csn(LOW);
SPI.transfer( R_REGISTER | ( REGISTER_MASK & reg ) );
uint8_t result = SPI.transfer(0xff);
csn(HIGH);
#endif
return result;
}
/****************************************************************************/
uint8_t RF24::write_register(uint8_t reg, const uint8_t* buf, uint8_t len)
{
uint8_t status;
#if defined (__arm__) && !defined ( CORE_TEENSY )
status = SPI.transfer(csn_pin, W_REGISTER | ( REGISTER_MASK & reg ), SPI_CONTINUE );
while ( --len){
SPI.transfer(csn_pin,*buf++, SPI_CONTINUE);
}
SPI.transfer(csn_pin,*buf++);
#else
csn(LOW);
status = SPI.transfer( W_REGISTER | ( REGISTER_MASK & reg ) );
while ( len-- )
SPI.transfer(*buf++);
csn(HIGH);
#endif
return status;
}
/****************************************************************************/
uint8_t RF24::write_register(uint8_t reg, uint8_t value)
{
uint8_t status;
IF_SERIAL_DEBUG(printf_P(PSTR("write_register(%02x,%02x)\r\n"),reg,value));
#if defined (__arm__) && !defined ( CORE_TEENSY )
status = SPI.transfer(csn_pin, W_REGISTER | ( REGISTER_MASK & reg ), SPI_CONTINUE);
SPI.transfer(csn_pin,value);
#else
csn(LOW);
status = SPI.transfer( W_REGISTER | ( REGISTER_MASK & reg ) );
SPI.transfer(value);
csn(HIGH);
#endif
return status;
}
/****************************************************************************/
uint8_t RF24::write_payload(const void* buf, uint8_t data_len, const uint8_t writeType)
{
uint8_t status;
const uint8_t* current = reinterpret_cast<const uint8_t*>(buf);
if(data_len > 32) data_len = 32;
uint8_t blank_len = dynamic_payloads_enabled ? 0 : 32 - data_len;
//printf("[Writing %u bytes %u blanks]",data_len,blank_len);
#if defined (__arm__) && !defined ( CORE_TEENSY )
status = SPI.transfer(csn_pin, writeType , SPI_CONTINUE);
if(blank_len){
while ( data_len--){
SPI.transfer(csn_pin,*current++, SPI_CONTINUE);
}
while ( --blank_len ){
SPI.transfer(csn_pin,0, SPI_CONTINUE);
}
SPI.transfer(csn_pin,0);
}else{
while( --data_len ){
SPI.transfer(csn_pin,*current++, SPI_CONTINUE);
}
SPI.transfer(csn_pin,*current);
}
#else
csn(LOW);
status = SPI.transfer( writeType );
while ( data_len-- ) {
SPI.transfer(*current++);
}
while ( blank_len-- ) {
SPI.transfer(0);
}
csn(HIGH);
#endif
return status;
}
/****************************************************************************/
uint8_t RF24::read_payload(void* buf, uint8_t data_len)
{
uint8_t status;
uint8_t* current = reinterpret_cast<uint8_t*>(buf);
if(data_len > payload_size) data_len = payload_size;
uint8_t blank_len = dynamic_payloads_enabled ? 0 : 32 - data_len;
//printf("[Reading %u bytes %u blanks]",data_len,blank_len);
#if defined (__arm__) && !defined ( CORE_TEENSY )
status = SPI.transfer(csn_pin, R_RX_PAYLOAD, SPI_CONTINUE );
if( blank_len ){
while ( data_len-- ){
*current++ = SPI.transfer(csn_pin,0xFF, SPI_CONTINUE);
}
while ( --blank_len ){
SPI.transfer(csn_pin,0xFF, SPI_CONTINUE);
}
SPI.transfer(csn_pin,0xFF);
}else{
while ( --data_len ){
*current++ = SPI.transfer(csn_pin,0xFF, SPI_CONTINUE);
}
*current = SPI.transfer(csn_pin,0xFF);
}
#else
csn(LOW);
status = SPI.transfer( R_RX_PAYLOAD );
while ( data_len-- ) {
*current++ = SPI.transfer(0xFF);
}
while ( blank_len-- ) {
SPI.transfer(0xff);
}
csn(HIGH);
#endif
return status;
}
/****************************************************************************/
uint8_t RF24::flush_rx(void)
{
return spiTrans( FLUSH_RX );
}
/****************************************************************************/
uint8_t RF24::flush_tx(void)
{
return spiTrans( FLUSH_TX );
}
/****************************************************************************/
uint8_t RF24::spiTrans(uint8_t cmd){
uint8_t status;
#if defined (__arm__) && !defined ( CORE_TEENSY )
status = SPI.transfer(csn_pin, cmd );
#else
csn(LOW);
status = SPI.transfer( cmd );
csn(HIGH);
#endif
return status;
}
/****************************************************************************/
uint8_t RF24::get_status(void)
{
return spiTrans(NOP);
}
/****************************************************************************/
void RF24::print_status(uint8_t status)
{
printf_P(PSTR("STATUS\t\t = 0x%02x RX_DR=%x TX_DS=%x MAX_RT=%x RX_P_NO=%x TX_FULL=%x\r\n"),
status,
(status & _BV(RX_DR))?1:0,
(status & _BV(TX_DS))?1:0,
(status & _BV(MAX_RT))?1:0,
((status >> RX_P_NO) & B111),
(status & _BV(TX_FULL))?1:0
);
}
/****************************************************************************/
void RF24::print_observe_tx(uint8_t value)
{
printf_P(PSTR("OBSERVE_TX=%02x: POLS_CNT=%x ARC_CNT=%x\r\n"),
value,
(value >> PLOS_CNT) & B1111,
(value >> ARC_CNT) & B1111
);
}
/****************************************************************************/
void RF24::print_byte_register(const char* name, uint8_t reg, uint8_t qty)
{
char extra_tab = strlen_P(name) < 8 ? '\t' : 0;
printf_P(PSTR(PRIPSTR"\t%c ="),name,extra_tab);
while (qty--)
printf_P(PSTR(" 0x%02x"),read_register(reg++));
printf_P(PSTR("\r\n"));
}
/****************************************************************************/
void RF24::print_address_register(const char* name, uint8_t reg, uint8_t qty)
{
char extra_tab = strlen_P(name) < 8 ? '\t' : 0;
printf_P(PSTR(PRIPSTR"\t%c ="),name,extra_tab);
while (qty--)
{
uint8_t buffer[addr_width];
read_register(reg++,buffer,sizeof buffer);
printf_P(PSTR(" 0x"));
uint8_t* bufptr = buffer + sizeof buffer;
while( --bufptr >= buffer )
printf_P(PSTR("%02x"),*bufptr);
}
printf_P(PSTR("\r\n"));
}
/****************************************************************************/
RF24::RF24(uint8_t _cepin, uint8_t _cspin):
ce_pin(_cepin), csn_pin(_cspin), p_variant(false),
payload_size(32), dynamic_payloads_enabled(false), addr_width(5)//,pipe0_reading_address(0)
{
}
/****************************************************************************/
void RF24::setChannel(uint8_t channel)
{
const uint8_t max_channel = 127;
write_register(RF_CH,min(channel,max_channel));
}
/****************************************************************************/
void RF24::setPayloadSize(uint8_t size)
{
payload_size = min(size,32);
}
/****************************************************************************/
uint8_t RF24::getPayloadSize(void)
{
return payload_size;
}
/****************************************************************************/
#if !defined (MINIMAL)
static const char rf24_datarate_e_str_0[] PROGMEM = "1MBPS";
static const char rf24_datarate_e_str_1[] PROGMEM = "2MBPS";
static const char rf24_datarate_e_str_2[] PROGMEM = "250KBPS";
static const char * const rf24_datarate_e_str_P[] PROGMEM = {
rf24_datarate_e_str_0,
rf24_datarate_e_str_1,
rf24_datarate_e_str_2,
};
static const char rf24_model_e_str_0[] PROGMEM = "nRF24L01";
static const char rf24_model_e_str_1[] PROGMEM = "nRF24L01+";
static const char * const rf24_model_e_str_P[] PROGMEM = {
rf24_model_e_str_0,
rf24_model_e_str_1,
};
static const char rf24_crclength_e_str_0[] PROGMEM = "Disabled";
static const char rf24_crclength_e_str_1[] PROGMEM = "8 bits";
static const char rf24_crclength_e_str_2[] PROGMEM = "16 bits" ;
static const char * const rf24_crclength_e_str_P[] PROGMEM = {
rf24_crclength_e_str_0,
rf24_crclength_e_str_1,
rf24_crclength_e_str_2,
};
static const char rf24_pa_dbm_e_str_0[] PROGMEM = "PA_MIN";
static const char rf24_pa_dbm_e_str_1[] PROGMEM = "PA_LOW";
static const char rf24_pa_dbm_e_str_2[] PROGMEM = "PA_HIGH";
static const char rf24_pa_dbm_e_str_3[] PROGMEM = "PA_MAX";
static const char * const rf24_pa_dbm_e_str_P[] PROGMEM = {
rf24_pa_dbm_e_str_0,
rf24_pa_dbm_e_str_1,
rf24_pa_dbm_e_str_2,
rf24_pa_dbm_e_str_3,
};
void RF24::printDetails(void)
{
print_status(get_status());
print_address_register(PSTR("RX_ADDR_P0-1"),RX_ADDR_P0,2);
print_byte_register(PSTR("RX_ADDR_P2-5"),RX_ADDR_P2,4);
print_address_register(PSTR("TX_ADDR"),TX_ADDR);
print_byte_register(PSTR("RX_PW_P0-6"),RX_PW_P0,6);
print_byte_register(PSTR("EN_AA"),EN_AA);
print_byte_register(PSTR("EN_RXADDR"),EN_RXADDR);
print_byte_register(PSTR("RF_CH"),RF_CH);
print_byte_register(PSTR("RF_SETUP"),RF_SETUP);
print_byte_register(PSTR("CONFIG"),CONFIG);
print_byte_register(PSTR("DYNPD/FEATURE"),DYNPD,2);
#if defined(__arm__)
printf_P(PSTR("Data Rate\t = %s\r\n"),pgm_read_word(&rf24_datarate_e_str_P[getDataRate()]));
printf_P(PSTR("Model\t\t = %s\r\n"),pgm_read_word(&rf24_model_e_str_P[isPVariant()]));
printf_P(PSTR("CRC Length\t = %s\r\n"),pgm_read_word(&rf24_crclength_e_str_P[getCRCLength()]));
printf_P(PSTR("PA Power\t = %s\r\n"),pgm_read_word(&rf24_pa_dbm_e_str_P[getPALevel()]));
#else
printf_P(PSTR("Data Rate\t = %S\r\n"),pgm_read_word(&rf24_datarate_e_str_P[getDataRate()]));
printf_P(PSTR("Model\t\t = %S\r\n"),pgm_read_word(&rf24_model_e_str_P[isPVariant()]));
printf_P(PSTR("CRC Length\t = %S\r\n"),pgm_read_word(&rf24_crclength_e_str_P[getCRCLength()]));
printf_P(PSTR("PA Power\t = %S\r\n"),pgm_read_word(&rf24_pa_dbm_e_str_P[getPALevel()]));
#endif
}
#endif
/****************************************************************************/
void RF24::begin(void)
{
// Initialize pins
pinMode(ce_pin,OUTPUT);
#if defined(__arm__) && ! defined( CORE_TEENSY )
SPI.begin(csn_pin); // Using the extended SPI features of the DUE
SPI.setClockDivider(csn_pin, 9); // Set the bus speed to 8.4mhz on Due
SPI.setBitOrder(csn_pin,MSBFIRST); // Set the bit order and mode specific to this device
SPI.setDataMode(csn_pin,SPI_MODE0);
ce(LOW);
//csn(HIGH);
#else
pinMode(csn_pin,OUTPUT);
SPI.begin();
ce(LOW);
csn(HIGH);
#endif
// Must allow the radio time to settle else configuration bits will not necessarily stick.
// This is actually only required following power up but some settling time also appears to
// be required after resets too. For full coverage, we'll always assume the worst.
// Enabling 16b CRC is by far the most obvious case if the wrong timing is used - or skipped.
// Technically we require 4.5ms + 14us as a worst case. We'll just call it 5ms for good measure.
// WARNING: Delay is based on P-variant whereby non-P *may* require different timing.
delay( 5 ) ;
// Set 1500uS (minimum for 32B payload in ESB@250KBPS) timeouts, to make testing a little easier
// WARNING: If this is ever lowered, either 250KBS mode with AA is broken or maximum packet
// sizes must never be used. See documentation for a more complete explanation.
setRetries(5,15);
// Reset value is MAX
//setPALevel( RF24_PA_MAX ) ;
// Determine if this is a p or non-p RF24 module and then
// reset our data rate back to default value. This works
// because a non-P variant won't allow the data rate to
// be set to 250Kbps.
if( setDataRate( RF24_250KBPS ) )
{
p_variant = true ;
}
// Then set the data rate to the slowest (and most reliable) speed supported by all
// hardware.
setDataRate( RF24_1MBPS ) ;
// Initialize CRC and request 2-byte (16bit) CRC
setCRCLength( RF24_CRC_16 ) ;
// Disable dynamic payloads, to match dynamic_payloads_enabled setting - Reset value is 0
//write_register(DYNPD,0);
// Reset current status
// Notice reset and flush is the last thing we do
write_register(STATUS,_BV(RX_DR) | _BV(TX_DS) | _BV(MAX_RT) );
// Set up default configuration. Callers can always change it later.
// This channel should be universally safe and not bleed over into adjacent
// spectrum.
setChannel(76);
// Flush buffers
flush_rx();
flush_tx();
powerUp(); //Power up by default when begin() is called
// Enable PTX, do not write CE high so radio will remain in standby I mode ( 130us max to transition to RX or TX instead of 1500us from powerUp )
// PTX should use only 22uA of power
write_register(CONFIG, ( read_register(CONFIG) ) & ~_BV(PRIM_RX) );
}
/****************************************************************************/
void RF24::startListening(void)
{
powerUp();
write_register(CONFIG, read_register(CONFIG) | _BV(PRIM_RX));
write_register(STATUS, _BV(RX_DR) | _BV(TX_DS) | _BV(MAX_RT) );
// Restore the pipe0 adddress, if exists
if (pipe0_reading_address[0] > 0){
write_register(RX_ADDR_P0, pipe0_reading_address, addr_width);
}
// Flush buffers
//flush_rx();
flush_tx();
// Go!
ce(HIGH);
}
/****************************************************************************/
void RF24::stopListening(void)
{
ce(LOW);
#if defined(__arm__)
delayMicroseconds(130);
#endif
flush_tx();
//flush_rx();
write_register(CONFIG, ( read_register(CONFIG) ) & ~_BV(PRIM_RX) );
delayMicroseconds(130); //Found that adding this delay back actually increases response time
}
/****************************************************************************/
void RF24::powerDown(void)
{
ce(LOW); // Guarantee CE is low on powerDown
write_register(CONFIG,read_register(CONFIG) & ~_BV(PWR_UP));
}
/****************************************************************************/
//Power up now. Radio will not power down unless instructed by MCU for config changes etc.
void RF24::powerUp(void)
{
uint8_t cfg = read_register(CONFIG);
// if not powered up then power up and wait for the radio to initialize
if (!(cfg & _BV(PWR_UP))){
write_register(CONFIG,read_register(CONFIG) | _BV(PWR_UP));
// For nRF24L01+ to go from power down mode to TX or RX mode it must first pass through stand-by mode.
// There must be a delay of Tpd2stby (see Table 16.) after the nRF24L01+ leaves power down mode before
// the CEis set high. - Tpd2stby can be up to 5ms per the 1.0 datasheet
delay(5);
}
}
/******************************************************************/
#if defined (FAILURE_HANDLING)
void RF24::errNotify(){
IF_SERIAL_DEBUG(printf_P(PSTR("HARDWARE FAIL\r\n")));
failureDetected = 1;
}
#endif
/******************************************************************/
//Similar to the previous write, clears the interrupt flags
bool RF24::write( const void* buf, uint8_t len, const bool multicast )
{
//Start Writing
startFastWrite(buf,len,multicast);
//Wait until complete or failed
#if defined (FAILURE_HANDLING)
uint32_t timer = millis();
#endif
while( ! ( get_status() & ( _BV(TX_DS) | _BV(MAX_RT) ))) {
#if defined (FAILURE_HANDLING)
if(millis() - timer > 75){
errNotify();
return 0;
}
#endif
}
ce(LOW);
uint8_t status = write_register(STATUS,_BV(RX_DR) | _BV(TX_DS) | _BV(MAX_RT) );
//Max retries exceeded
if( status & _BV(MAX_RT)){
flush_tx(); //Only going to be 1 packet int the FIFO at a time using this method, so just flush
return 0;
}
//TX OK 1 or 0
return 1;
}
bool RF24::write( const void* buf, uint8_t len ){
return write(buf,len,0);
}
/****************************************************************************/
//For general use, the interrupt flags are not important to clear
bool RF24::writeBlocking( const void* buf, uint8_t len, uint32_t timeout )
{
//Block until the FIFO is NOT full.
//Keep track of the MAX retries and set auto-retry if seeing failures
//This way the FIFO will fill up and allow blocking until packets go through
//The radio will auto-clear everything in the FIFO as long as CE remains high
uint32_t timer = millis(); //Get the time that the payload transmission started
while( ( get_status() & ( _BV(TX_FULL) ))) { //Blocking only if FIFO is full. This will loop and block until TX is successful or timeout
if( get_status() & _BV(MAX_RT)){ //If MAX Retries have been reached
reUseTX(); //Set re-transmit and clear the MAX_RT interrupt flag
if(millis() - timer > timeout){ return 0; } //If this payload has exceeded the user-defined timeout, exit and return 0
}
#if defined (FAILURE_HANDLING)
if(millis() - timer > (timeout+75) ){
errNotify();
return 0;
}
#endif
}
//Start Writing
startFastWrite(buf,len,0); //Write the payload if a buffer is clear
return 1; //Return 1 to indicate successful transmission
}
/****************************************************************************/
void RF24::reUseTX(){
write_register(STATUS,_BV(MAX_RT) ); //Clear max retry flag
spiTrans( REUSE_TX_PL );
ce(LOW); //Re-Transfer packet
ce(HIGH);
}
/****************************************************************************/
bool RF24::writeFast( const void* buf, uint8_t len, const bool multicast )
{
//Block until the FIFO is NOT full.
//Keep track of the MAX retries and set auto-retry if seeing failures
//Return 0 so the user can control the retrys and set a timer or failure counter if required
//The radio will auto-clear everything in the FIFO as long as CE remains high
#if defined (FAILURE_HANDLING)
uint32_t timer = millis();
#endif
while( ( get_status() & ( _BV(TX_FULL) ))) { //Blocking only if FIFO is full. This will loop and block until TX is successful or fail
if( get_status() & _BV(MAX_RT)){
//reUseTX(); //Set re-transmit
write_register(STATUS,_BV(MAX_RT) ); //Clear max retry flag
return 0; //Return 0. The previous payload has been retransmitted
//From the user perspective, if you get a 0, just keep trying to send the same payload
}
#if defined (FAILURE_HANDLING)
if(millis() - timer > 75 ){
errNotify();
return 0;
}
#endif
}
//Start Writing
startFastWrite(buf,len,multicast);
return 1;
}
bool RF24::writeFast( const void* buf, uint8_t len ){
return writeFast(buf,len,0);
}
/****************************************************************************/
//Per the documentation, we want to set PTX Mode when not listening. Then all we do is write data and set CE high
//In this mode, if we can keep the FIFO buffers loaded, packets will transmit immediately (no 130us delay)
//Otherwise we enter Standby-II mode, which is still faster than standby mode
//Also, we remove the need to keep writing the config register over and over and delaying for 150 us each time if sending a stream of data
void RF24::startFastWrite( const void* buf, uint8_t len, const bool multicast){ //TMRh20
//write_payload( buf,len);
write_payload( buf, len,multicast ? W_TX_PAYLOAD_NO_ACK : W_TX_PAYLOAD ) ;
ce(HIGH);
}
//Added the original startWrite back in so users can still use interrupts, ack payloads, etc
//Allows the library to pass all tests
void RF24::startWrite( const void* buf, uint8_t len, const bool multicast ){
// Send the payload
//write_payload( buf, len );
write_payload( buf, len,multicast? W_TX_PAYLOAD_NO_ACK : W_TX_PAYLOAD ) ;
ce(HIGH);
#if defined(CORE_TEENSY) || !defined(ARDUINO)
delayMicroseconds(10);
#endif
ce(LOW);
}
bool RF24::txStandBy(){
#if defined (FAILURE_HANDLING)
uint32_t timeout = millis();
#endif
while( ! (read_register(FIFO_STATUS) & _BV(TX_EMPTY)) ){
if( get_status() & _BV(MAX_RT)){
write_register(STATUS,_BV(MAX_RT) );
ce(LOW);
flush_tx(); //Non blocking, flush the data
return 0;
}
#if defined (FAILURE_HANDLING)
if( millis() - timeout > 75){
errNotify();
return 0;
}
#endif
}
ce(LOW); //Set STANDBY-I mode
return 1;
}
bool RF24::txStandBy(uint32_t timeout){
uint32_t start = millis();
while( ! (read_register(FIFO_STATUS) & _BV(TX_EMPTY)) ){
if( get_status() & _BV(MAX_RT)){
write_register(STATUS,_BV(MAX_RT) );
ce(LOW); //Set re-transmit
ce(HIGH);
if(millis() - start >= timeout){
ce(LOW); flush_tx(); return 0;
}
}
#if defined (FAILURE_HANDLING)
if( millis() - start > (timeout+75)){
errNotify();
return 0;
}
#endif
}
ce(LOW); //Set STANDBY-I mode
return 1;
}
/****************************************************************************/
void RF24::maskIRQ(bool tx, bool fail, bool rx){
write_register(CONFIG, ( read_register(CONFIG) ) | fail << MASK_MAX_RT | tx << MASK_TX_DS | rx << MASK_RX_DR );
}
/****************************************************************************/
uint8_t RF24::getDynamicPayloadSize(void)
{
uint8_t result = 0;
#if defined (__arm__) && ! defined( CORE_TEENSY )
SPI.transfer(csn_pin, R_RX_PL_WID, SPI_CONTINUE );
result = SPI.transfer(csn_pin,0xff);
#else
csn(LOW);
SPI.transfer( R_RX_PL_WID );
result = SPI.transfer(0xff);
csn(HIGH);
#endif
if(result > 32) { flush_rx(); return 0; }
return result;
}
/****************************************************************************/
bool RF24::available(void)
{
return available(NULL);
}
/****************************************************************************/
bool RF24::available(uint8_t* pipe_num)
{
//Check the FIFO buffer to see if data is waitng to be read
if (!( read_register(FIFO_STATUS) & _BV(RX_EMPTY) )){
// If the caller wants the pipe number, include that
if ( pipe_num ){
uint8_t status = get_status();
*pipe_num = ( status >> RX_P_NO ) & B111;
}
return 1;
}
return 0;
}
/****************************************************************************/
void RF24::read( void* buf, uint8_t len ){
// Fetch the payload
read_payload( buf, len );
//Clear the two possible interrupt flags with one command
write_register(STATUS,_BV(RX_DR) | _BV(MAX_RT) | _BV(TX_DS) );
}
/****************************************************************************/
void RF24::whatHappened(bool& tx_ok,bool& tx_fail,bool& rx_ready)
{
// Read the status & reset the status in one easy call
// Or is that such a good idea?
uint8_t status = write_register(STATUS,_BV(RX_DR) | _BV(TX_DS) | _BV(MAX_RT) );
// Report to the user what happened
tx_ok = status & _BV(TX_DS);
tx_fail = status & _BV(MAX_RT);
rx_ready = status & _BV(RX_DR);
}
/****************************************************************************/
void RF24::openWritingPipe(uint64_t value)
{
// Note that AVR 8-bit uC's store this LSB first, and the NRF24L01(+)
// expects it LSB first too, so we're good.
write_register(RX_ADDR_P0, reinterpret_cast<uint8_t*>(&value), addr_width);
write_register(TX_ADDR, reinterpret_cast<uint8_t*>(&value), addr_width);
//const uint8_t max_payload_size = 32;
//write_register(RX_PW_P0,min(payload_size,max_payload_size));
write_register(RX_PW_P0,payload_size);
}
/****************************************************************************/
void RF24::openWritingPipe(const uint8_t *address)
{
// Note that AVR 8-bit uC's store this LSB first, and the NRF24L01(+)
// expects it LSB first too, so we're good.
write_register(RX_ADDR_P0,address, addr_width);
write_register(TX_ADDR, address, addr_width);
//const uint8_t max_payload_size = 32;
//write_register(RX_PW_P0,min(payload_size,max_payload_size));
write_register(RX_PW_P0,payload_size);
}
/****************************************************************************/
static const uint8_t child_pipe[] PROGMEM =
{
RX_ADDR_P0, RX_ADDR_P1, RX_ADDR_P2, RX_ADDR_P3, RX_ADDR_P4, RX_ADDR_P5
};
static const uint8_t child_payload_size[] PROGMEM =
{
RX_PW_P0, RX_PW_P1, RX_PW_P2, RX_PW_P3, RX_PW_P4, RX_PW_P5
};
static const uint8_t child_pipe_enable[] PROGMEM =
{
ERX_P0, ERX_P1, ERX_P2, ERX_P3, ERX_P4, ERX_P5
};
void RF24::openReadingPipe(uint8_t child, uint64_t address)
{
// If this is pipe 0, cache the address. This is needed because
// openWritingPipe() will overwrite the pipe 0 address, so
// startListening() will have to restore it.
if (child == 0){
memcpy(pipe0_reading_address,&address,addr_width);
}
if (child <= 6)
{
// For pipes 2-5, only write the LSB
if ( child < 2 )
write_register(pgm_read_byte(&child_pipe[child]), reinterpret_cast<const uint8_t*>(&address), addr_width);
else
write_register(pgm_read_byte(&child_pipe[child]), reinterpret_cast<const uint8_t*>(&address), 1);
write_register(pgm_read_byte(&child_payload_size[child]),payload_size);
// Note it would be more efficient to set all of the bits for all open
// pipes at once. However, I thought it would make the calling code
// more simple to do it this way.
write_register(EN_RXADDR,read_register(EN_RXADDR) | _BV(pgm_read_byte(&child_pipe_enable[child])));
}
}
/****************************************************************************/
void RF24::setAddressWidth(uint8_t a_width){
if(a_width -= 2){
write_register(SETUP_AW,a_width%4);
addr_width = (a_width%4) + 2;
}
}
/****************************************************************************/
void RF24::openReadingPipe(uint8_t child, const uint8_t *address)
{
// If this is pipe 0, cache the address. This is needed because
// openWritingPipe() will overwrite the pipe 0 address, so
// startListening() will have to restore it.
if (child == 0){
memcpy(pipe0_reading_address,address,addr_width);
}
if (child <= 6)
{
// For pipes 2-5, only write the LSB
if ( child < 2 ){
write_register(pgm_read_byte(&child_pipe[child]), address, addr_width);
}else{
write_register(pgm_read_byte(&child_pipe[child]), address, 1);
}
write_register(pgm_read_byte(&child_payload_size[child]),payload_size);
// Note it would be more efficient to set all of the bits for all open
// pipes at once. However, I thought it would make the calling code
// more simple to do it this way.
write_register(EN_RXADDR,read_register(EN_RXADDR) | _BV(pgm_read_byte(&child_pipe_enable[child])));
}
}
/****************************************************************************/
void RF24::closeReadingPipe( uint8_t pipe )
{
write_register(EN_RXADDR,read_register(EN_RXADDR) & ~_BV(pgm_read_byte(&child_pipe_enable[pipe])));
}
/****************************************************************************/
void RF24::toggle_features(void)
{
#if defined (__arm__) && ! defined( CORE_TEENSY )
SPI.transfer(csn_pin, ACTIVATE, SPI_CONTINUE );
SPI.transfer(csn_pin, 0x73 );
#else
csn(LOW);
SPI.transfer( ACTIVATE );
SPI.transfer( 0x73 );
csn(HIGH);
#endif
}
/****************************************************************************/
void RF24::enableDynamicPayloads(void)
{
// Enable dynamic payload throughout the system
toggle_features();
write_register(FEATURE,read_register(FEATURE) | _BV(EN_DPL) );
IF_SERIAL_DEBUG(printf("FEATURE=%i\r\n",read_register(FEATURE)));