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RF24.cpp
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/*
Copyright (C) 2011 J. Coliz <[email protected]>
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::ce(bool level)
{
hal->ce(level);
}
/****************************************************************************/
void RF24::read_register(uint8_t reg, uint8_t* buf, uint8_t len)
{
status = hal->read(R_REGISTER | reg, buf, len);
}
/****************************************************************************/
uint8_t RF24::read_register(uint8_t reg)
{
uint8_t result = 0xff;
status = hal->read(R_REGISTER | reg, &result, sizeof(result));
return result;
}
/****************************************************************************/
void RF24::write_register(uint8_t reg, const uint8_t* buf, uint8_t len)
{
status = hal->write(W_REGISTER | reg, buf, len);
}
/****************************************************************************/
void RF24::write_register(uint8_t reg, uint8_t value, bool is_cmd_only)
{
if (is_cmd_only) {
if (reg != RF24_NOP) { // don't print the get_status() operation
IF_SERIAL_DEBUG(printf_P(PSTR("write_register(%02x)\r\n"), reg));
}
status = hal->write(W_REGISTER | reg, nullptr, 0);
}
else {
IF_SERIAL_DEBUG(printf_P(PSTR("write_register(%02x,%02x)\r\n"), reg, value));
status = hal->write(W_REGISTER | reg, &value, sizeof(value));
}
}
/****************************************************************************/
void RF24::write_payload(const void* buf, uint8_t data_len, const uint8_t writeType)
{
const uint8_t* current = reinterpret_cast<const uint8_t*>(buf);
uint8_t blank_len = !data_len ? 1 : 0;
if (!dynamic_payloads_enabled) {
data_len = rf24_min(data_len, payload_size);
blank_len = static_cast<uint8_t>(payload_size - data_len);
}
else {
data_len = rf24_min(data_len, static_cast<uint8_t>(32));
}
IF_SERIAL_DEBUG(printf("[Writing %u bytes %u blanks]\n", data_len, blank_len););
status = hal->write(writeType, current, data_len, blank_len);
}
/****************************************************************************/
void RF24::read_payload(void* buf, uint8_t data_len)
{
uint8_t* current = reinterpret_cast<uint8_t*>(buf);
uint8_t blank_len = 0;
if (!dynamic_payloads_enabled) {
data_len = rf24_min(data_len, payload_size);
blank_len = static_cast<uint8_t>(payload_size - data_len);
}
else {
data_len = rf24_min(data_len, static_cast<uint8_t>(32));
}
//printf("[Reading %u bytes %u blanks]",data_len,blank_len);
IF_SERIAL_DEBUG(printf("[Reading %u bytes %u blanks]\n", data_len, blank_len););
status = hal->read(R_RX_PAYLOAD, current, data_len, blank_len);
}
/****************************************************************************/
uint8_t RF24::flush_rx(void)
{
write_register(FLUSH_RX, RF24_NOP, true);
return status;
}
/****************************************************************************/
uint8_t RF24::flush_tx(void)
{
write_register(FLUSH_TX, RF24_NOP, true);
return status;
}
/****************************************************************************/
uint8_t RF24::get_status(void)
{
write_register(RF24_NOP, RF24_NOP, true);
return status;
}
/****************************************************************************/
#if !defined(MINIMAL)
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) & 0x07), (_status & _BV(TX_FULL)) ? 1 : 0);
}
/****************************************************************************/
void RF24::print_observe_tx(uint8_t value)
{
printf_P(PSTR("OBSERVE_TX=%02x: PLOS_CNT=%x ARC_CNT=%x\r\n"), value, (value >> PLOS_CNT) & 0x0F, (value >> ARC_CNT) & 0x0F);
}
/****************************************************************************/
void RF24::print_byte_register(const char* name, uint8_t reg, uint8_t qty)
{
printf_P(PSTR(PRIPSTR
"\t="),
name);
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)
{
printf_P(PSTR(PRIPSTR
"\t="),
name);
while (qty--) {
uint8_t* buffer = new uint8_t[addr_width];
read_register(reg++ & REGISTER_MASK, buffer, addr_width);
printf_P(PSTR(" 0x"));
uint8_t* bufptr = buffer + addr_width;
while (--bufptr >= buffer) {
printf_P(PSTR("%02x"), *bufptr); // NOLINT: clang-tidy seems to emit a false positive about zero-allocated memory here (*bufptr)
}
delete[] buffer;
}
printf_P(PSTR("\r\n"));
}
/****************************************************************************/
uint8_t RF24::sprintf_address_register(char* out_buffer, uint8_t reg, uint8_t qty)
{
uint8_t offset = 0;
uint8_t* read_buffer = new uint8_t[addr_width];
while (qty--) {
read_register(reg++ & REGISTER_MASK, read_buffer, addr_width);
uint8_t* bufptr = read_buffer + addr_width;
while (--bufptr >= read_buffer) {
offset += sprintf_P(out_buffer + offset, PSTR("%02X"), *bufptr);
}
}
delete[] read_buffer;
return offset;
}
#endif // !defined(MINIMAL)
/****************************************************************************/
RF24::RF24(RF24_hal* _hal)
: hal(_hal), payload_size(32), _is_p_variant(false), _is_p0_rx(false), addr_width(5), dynamic_payloads_enabled(true), csDelay(5)
{
_init_obj();
}
/****************************************************************************/
RF24::RF24()
: hal(nullptr), payload_size(32), _is_p_variant(false), _is_p0_rx(false), addr_width(5), dynamic_payloads_enabled(true), csDelay(5)
{
_init_obj();
}
/****************************************************************************/
void RF24::_init_obj()
{
pipe0_reading_address[0] = 0;
}
/****************************************************************************/
void RF24::setChannel(uint8_t channel)
{
const uint8_t max_channel = 125;
write_register(RF_CH, rf24_min(channel, max_channel));
}
uint8_t RF24::getChannel()
{
return read_register(RF_CH);
}
/****************************************************************************/
void RF24::setPayloadSize(uint8_t size)
{
// payload size must be in range [1, 32]
payload_size = static_cast<uint8_t>(rf24_max(1, rf24_min(32, size)));
// write static payload size setting for all pipes
for (uint8_t i = 0; i < 6; ++i) {
write_register(static_cast<uint8_t>(RX_PW_P0 + i), payload_size);
}
}
/****************************************************************************/
uint8_t RF24::getPayloadSize(void)
{
return payload_size;
}
/****************************************************************************/
#if !defined(MINIMAL)
static const PROGMEM char rf24_datarate_e_str_0[] = "= 1 MBPS";
static const PROGMEM char rf24_datarate_e_str_1[] = "= 2 MBPS";
static const PROGMEM char rf24_datarate_e_str_2[] = "= 250 KBPS";
static const PROGMEM char* const rf24_datarate_e_str_P[] = {
rf24_datarate_e_str_0,
rf24_datarate_e_str_1,
rf24_datarate_e_str_2,
};
static const PROGMEM char rf24_model_e_str_0[] = "nRF24L01";
static const PROGMEM char rf24_model_e_str_1[] = "nRF24L01+";
static const PROGMEM char* const rf24_model_e_str_P[] = {
rf24_model_e_str_0,
rf24_model_e_str_1,
};
static const PROGMEM char rf24_crclength_e_str_0[] = "= Disabled";
static const PROGMEM char rf24_crclength_e_str_1[] = "= 8 bits";
static const PROGMEM char rf24_crclength_e_str_2[] = "= 16 bits";
static const PROGMEM char* const rf24_crclength_e_str_P[] = {
rf24_crclength_e_str_0,
rf24_crclength_e_str_1,
rf24_crclength_e_str_2,
};
static const PROGMEM char rf24_pa_dbm_e_str_0[] = "= PA_MIN";
static const PROGMEM char rf24_pa_dbm_e_str_1[] = "= PA_LOW";
static const PROGMEM char rf24_pa_dbm_e_str_2[] = "= PA_HIGH";
static const PROGMEM char rf24_pa_dbm_e_str_3[] = "= PA_MAX";
static const PROGMEM char* const rf24_pa_dbm_e_str_P[] = {
rf24_pa_dbm_e_str_0,
rf24_pa_dbm_e_str_1,
rf24_pa_dbm_e_str_2,
rf24_pa_dbm_e_str_3,
};
static const PROGMEM char rf24_feature_e_str_on[] = "= Enabled";
static const PROGMEM char rf24_feature_e_str_allowed[] = "= Allowed";
static const PROGMEM char rf24_feature_e_str_open[] = " open ";
static const PROGMEM char rf24_feature_e_str_closed[] = "closed";
static const PROGMEM char* const rf24_feature_e_str_P[] = {
rf24_crclength_e_str_0,
rf24_feature_e_str_on,
rf24_feature_e_str_allowed,
rf24_feature_e_str_closed,
rf24_feature_e_str_open,
};
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\t"), TX_ADDR);
print_byte_register(PSTR("RX_PW_P0-6"), RX_PW_P0, 6);
print_byte_register(PSTR("EN_AA\t"), EN_AA);
print_byte_register(PSTR("EN_RXADDR"), EN_RXADDR);
print_byte_register(PSTR("RF_CH\t"), RF_CH);
print_byte_register(PSTR("RF_SETUP"), RF_SETUP);
print_byte_register(PSTR("CONFIG\t"), NRF_CONFIG);
print_byte_register(PSTR("DYNPD/FEATURE"), DYNPD, 2);
printf_P(PSTR("Data Rate\t" PRIPSTR
"\r\n"),
(char*)(pgm_read_ptr(&rf24_datarate_e_str_P[getDataRate()])));
printf_P(PSTR("Model\t\t= " PRIPSTR
"\r\n"),
(char*)(pgm_read_ptr(&rf24_model_e_str_P[isPVariant()])));
printf_P(PSTR("CRC Length\t" PRIPSTR
"\r\n"),
(char*)(pgm_read_ptr(&rf24_crclength_e_str_P[getCRCLength()])));
printf_P(PSTR("PA Power\t" PRIPSTR
"\r\n"),
(char*)(pgm_read_ptr(&rf24_pa_dbm_e_str_P[getPALevel()])));
printf_P(PSTR("ARC\t\t= %d\r\n"), getARC());
}
void RF24::printPrettyDetails(void)
{
uint8_t channel = getChannel();
uint16_t frequency = static_cast<uint16_t>(channel + 2400);
printf_P(PSTR("Channel\t\t\t= %u (~ %u MHz)\r\n"), channel, frequency);
printf_P(PSTR("Model\t\t\t= " PRIPSTR
"\r\n"),
(char*)(pgm_read_ptr(&rf24_model_e_str_P[isPVariant()])));
printf_P(PSTR("RF Data Rate\t\t" PRIPSTR
"\r\n"),
(char*)(pgm_read_ptr(&rf24_datarate_e_str_P[getDataRate()])));
printf_P(PSTR("RF Power Amplifier\t" PRIPSTR
"\r\n"),
(char*)(pgm_read_ptr(&rf24_pa_dbm_e_str_P[getPALevel()])));
printf_P(PSTR("RF Low Noise Amplifier\t" PRIPSTR
"\r\n"),
(char*)(pgm_read_ptr(&rf24_feature_e_str_P[(read_register(RF_SETUP) & 1) * 1])));
printf_P(PSTR("CRC Length\t\t" PRIPSTR
"\r\n"),
(char*)(pgm_read_ptr(&rf24_crclength_e_str_P[getCRCLength()])));
printf_P(PSTR("Address Length\t\t= %d bytes\r\n"), (read_register(SETUP_AW) & 3) + 2);
printf_P(PSTR("Static Payload Length\t= %d bytes\r\n"), getPayloadSize());
uint8_t setupRetry = read_register(SETUP_RETR);
printf_P(PSTR("Auto Retry Delay\t= %d microseconds\r\n"), (setupRetry >> ARD) * 250 + 250);
printf_P(PSTR("Auto Retry Attempts\t= %d maximum\r\n"), setupRetry & 0x0F);
uint8_t observeTx = read_register(OBSERVE_TX);
printf_P(PSTR("Packets lost on\n current channel\t= %d\r\n"), observeTx >> 4);
printf_P(PSTR("Retry attempts made for\n last transmission\t= %d\r\n"), observeTx & 0x0F);
uint8_t features = read_register(FEATURE);
printf_P(PSTR("Multicast\t\t" PRIPSTR
"\r\n"),
(char*)(pgm_read_ptr(&rf24_feature_e_str_P[static_cast<bool>(features & _BV(EN_DYN_ACK)) * 2])));
printf_P(PSTR("Custom ACK Payload\t" PRIPSTR
"\r\n"),
(char*)(pgm_read_ptr(&rf24_feature_e_str_P[static_cast<bool>(features & _BV(EN_ACK_PAY)) * 1])));
uint8_t dynPl = read_register(DYNPD);
printf_P(PSTR("Dynamic Payloads\t" PRIPSTR
"\r\n"),
(char*)(pgm_read_ptr(&rf24_feature_e_str_P[(dynPl && (features & _BV(EN_DPL))) * 1])));
uint8_t autoAck = read_register(EN_AA);
if (autoAck == 0x3F || autoAck == 0) {
// all pipes have the same configuration about auto-ack feature
printf_P(PSTR("Auto Acknowledgment\t" PRIPSTR
"\r\n"),
(char*)(pgm_read_ptr(&rf24_feature_e_str_P[static_cast<bool>(autoAck) * 1])));
}
else {
// representation per pipe
printf_P(PSTR("Auto Acknowledgment\t= 0b%c%c%c%c%c%c\r\n"),
static_cast<char>(static_cast<bool>(autoAck & _BV(ENAA_P5)) + 48),
static_cast<char>(static_cast<bool>(autoAck & _BV(ENAA_P4)) + 48),
static_cast<char>(static_cast<bool>(autoAck & _BV(ENAA_P3)) + 48),
static_cast<char>(static_cast<bool>(autoAck & _BV(ENAA_P2)) + 48),
static_cast<char>(static_cast<bool>(autoAck & _BV(ENAA_P1)) + 48),
static_cast<char>(static_cast<bool>(autoAck & _BV(ENAA_P0)) + 48));
}
config_reg = read_register(NRF_CONFIG);
printf_P(PSTR("Primary Mode\t\t= %cX\r\n"), config_reg & _BV(PRIM_RX) ? 'R' : 'T');
print_address_register(PSTR("TX address\t"), TX_ADDR);
uint8_t openPipes = read_register(EN_RXADDR);
for (uint8_t i = 0; i < 6; ++i) {
bool isOpen = openPipes & _BV(i);
printf_P(PSTR("pipe %u (" PRIPSTR
") bound"),
i, (char*)(pgm_read_ptr(&rf24_feature_e_str_P[isOpen + 3])));
if (i < 2) {
print_address_register(PSTR(""), static_cast<uint8_t>(RX_ADDR_P0 + i));
}
else {
print_byte_register(PSTR(""), static_cast<uint8_t>(RX_ADDR_P0 + i));
}
}
}
/****************************************************************************/
uint16_t RF24::sprintfPrettyDetails(char* debugging_information)
{
const char* format_string = PSTR(
"Channel\t\t\t= %u (~ %u MHz)\n"
"RF Data Rate\t\t" PRIPSTR "\n"
"RF Power Amplifier\t" PRIPSTR "\n"
"RF Low Noise Amplifier\t" PRIPSTR "\n"
"CRC Length\t\t" PRIPSTR "\n"
"Address Length\t\t= %d bytes\n"
"Static Payload Length\t= %d bytes\n"
"Auto Retry Delay\t= %d microseconds\n"
"Auto Retry Attempts\t= %d maximum\n"
"Packets lost on\n current channel\t= %d\r\n"
"Retry attempts made for\n last transmission\t= %d\r\n"
"Multicast\t\t" PRIPSTR "\n"
"Custom ACK Payload\t" PRIPSTR "\n"
"Dynamic Payloads\t" PRIPSTR "\n"
"Auto Acknowledgment\t");
const char* format_str2 = PSTR("\nPrimary Mode\t\t= %cX\nTX address\t\t= 0x");
const char* format_str3 = PSTR("\nPipe %d (" PRIPSTR ") bound\t= 0x");
uint16_t offset = sprintf_P(
debugging_information, format_string, getChannel(),
static_cast<uint16_t>(getChannel() + 2400),
(char*)(pgm_read_ptr(&rf24_datarate_e_str_P[getDataRate()])),
(char*)(pgm_read_ptr(&rf24_pa_dbm_e_str_P[getPALevel()])),
(char*)(pgm_read_ptr(&rf24_feature_e_str_P[(read_register(RF_SETUP) & 1) * 1])),
(char*)(pgm_read_ptr(&rf24_crclength_e_str_P[getCRCLength()])),
((read_register(SETUP_AW) & 3) + 2), getPayloadSize(),
((read_register(SETUP_RETR) >> ARD) * 250 + 250),
(read_register(SETUP_RETR) & 0x0F), (read_register(OBSERVE_TX) >> 4),
(read_register(OBSERVE_TX) & 0x0F),
(char*)(pgm_read_ptr(&rf24_feature_e_str_P[static_cast<bool>(read_register(FEATURE) & _BV(EN_DYN_ACK)) * 2])),
(char*)(pgm_read_ptr(&rf24_feature_e_str_P[static_cast<bool>(read_register(FEATURE) & _BV(EN_ACK_PAY)) * 1])),
(char*)(pgm_read_ptr(&rf24_feature_e_str_P[(read_register(DYNPD) && (read_register(FEATURE) & _BV(EN_DPL))) * 1])));
uint8_t autoAck = read_register(EN_AA);
if (autoAck == 0x3F || autoAck == 0) {
// all pipes have the same configuration about auto-ack feature
offset += sprintf_P(
debugging_information + offset, PSTR("" PRIPSTR ""),
(char*)(pgm_read_ptr(&rf24_feature_e_str_P[static_cast<bool>(autoAck) * 1])));
}
else {
// representation per pipe
offset += sprintf_P(
debugging_information + offset, PSTR("= 0b%c%c%c%c%c%c"),
static_cast<char>(static_cast<bool>(autoAck & _BV(ENAA_P5)) + 48),
static_cast<char>(static_cast<bool>(autoAck & _BV(ENAA_P4)) + 48),
static_cast<char>(static_cast<bool>(autoAck & _BV(ENAA_P3)) + 48),
static_cast<char>(static_cast<bool>(autoAck & _BV(ENAA_P2)) + 48),
static_cast<char>(static_cast<bool>(autoAck & _BV(ENAA_P1)) + 48),
static_cast<char>(static_cast<bool>(autoAck & _BV(ENAA_P0)) + 48));
}
offset += sprintf_P(
debugging_information + offset, format_str2,
(read_register(NRF_CONFIG) & _BV(PRIM_RX) ? 'R' : 'T'));
offset += sprintf_address_register(debugging_information + offset, TX_ADDR);
uint8_t openPipes = read_register(EN_RXADDR);
for (uint8_t i = 0; i < 6; ++i) {
offset += sprintf_P(
debugging_information + offset, format_str3,
i, ((char*)(pgm_read_ptr(&rf24_feature_e_str_P[static_cast<bool>(openPipes & _BV(i)) + 3]))));
if (i < 2) {
offset += sprintf_address_register(
debugging_information + offset, static_cast<uint8_t>(RX_ADDR_P0 + i));
}
else {
offset += sprintf_P(
debugging_information + offset, PSTR("%02X"),
read_register(static_cast<uint8_t>(RX_ADDR_P0 + i)));
}
}
return offset;
}
/****************************************************************************/
void RF24::encodeRadioDetails(uint8_t* encoded_details)
{
uint8_t end = FEATURE + 1;
for (uint8_t i = NRF_CONFIG; i < end; ++i) {
if (i == RX_ADDR_P0 || i == RX_ADDR_P1 || i == TX_ADDR) {
// get 40-bit registers
read_register(i, encoded_details, 5);
encoded_details += 5;
}
else if (i != 0x18 && i != 0x19 && i != 0x1a && i != 0x1b) { // skip undocumented registers
// get single byte registers
*encoded_details++ = read_register(i);
}
}
}
#endif // !defined(MINIMAL)
/****************************************************************************/
bool RF24::begin(void)
{
return _init_pins() && _init_radio();
}
/****************************************************************************/
bool RF24::begin(RF24_hal* _hal)
{
hal = _hal;
return begin();
}
/****************************************************************************/
bool RF24::_init_pins()
{
if (!isValid()) {
// didn't specify the CSN & CE pins to c'tor nor begin()
return false;
}
return hal->begin();
}
/****************************************************************************/
bool RF24::_init_radio()
{
// 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 datasheet for a more complete explanation.
setRetries(5, 15);
// Then set the data rate to the slowest (and most reliable) speed supported by all hardware.
setDataRate(RF24_1MBPS);
// detect if is a plus variant & use old toggle features command accordingly
uint8_t before_toggle = read_register(FEATURE);
toggle_features();
uint8_t after_toggle = read_register(FEATURE);
_is_p_variant = before_toggle == after_toggle;
if (after_toggle) {
if (_is_p_variant) {
// module did not experience power-on-reset (#401)
toggle_features();
}
// allow use of multicast parameter and dynamic payloads by default
write_register(FEATURE, 0);
}
ack_payloads_enabled = false; // ack payloads disabled by default
write_register(DYNPD, 0); // disable dynamic payloads by default (for all pipes)
dynamic_payloads_enabled = false;
write_register(EN_AA, 0x3F); // enable auto-ack on all pipes
write_register(EN_RXADDR, 3); // only open RX pipes 0 & 1
setPayloadSize(32); // set static payload size to 32 (max) bytes by default
setAddressWidth(5); // set default address length to (max) 5 bytes
// 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);
// Reset current status
// Notice reset and flush is the last thing we do
write_register(NRF_STATUS, _BV(RX_DR) | _BV(TX_DS) | _BV(MAX_RT));
// Flush buffers
flush_rx();
flush_tx();
// Clear CONFIG register:
// Reflect all IRQ events on IRQ pin
// Enable PTX
// Power Up
// 16-bit CRC (CRC required by auto-ack)
// Do not write CE high so radio will remain in standby I mode
// PTX should use only 22uA of power
write_register(NRF_CONFIG, (_BV(EN_CRC) | _BV(CRCO)));
config_reg = read_register(NRF_CONFIG);
powerUp();
// if config is not set correctly then there was a bad response from module
return config_reg == (_BV(EN_CRC) | _BV(CRCO) | _BV(PWR_UP)) ? true : false;
}
/****************************************************************************/
bool RF24::isChipConnected()
{
return read_register(SETUP_AW) == (addr_width - static_cast<uint8_t>(2));
}
/****************************************************************************/
bool RF24::isValid()
{
return hal != nullptr;
}
/****************************************************************************/
void RF24::startListening(void)
{
#if !defined(RF24_TINY) && !defined(LITTLEWIRE)
powerUp();
#endif
config_reg |= _BV(PRIM_RX);
write_register(NRF_CONFIG, config_reg);
write_register(NRF_STATUS, _BV(RX_DR) | _BV(TX_DS) | _BV(MAX_RT));
ce(HIGH);
// Restore the pipe0 address, if exists
if (_is_p0_rx) {
write_register(RX_ADDR_P0, pipe0_reading_address, addr_width);
}
else {
closeReadingPipe(0);
}
}
/****************************************************************************/
static const PROGMEM uint8_t child_pipe_enable[] = {ERX_P0, ERX_P1, ERX_P2,
ERX_P3, ERX_P4, ERX_P5};
void RF24::stopListening(void)
{
ce(LOW);
//delayMicroseconds(100);
delayMicroseconds(static_cast<int>(txDelay));
if (ack_payloads_enabled) {
flush_tx();
}
config_reg = static_cast<uint8_t>(config_reg & ~_BV(PRIM_RX));
write_register(NRF_CONFIG, config_reg);
#if defined(RF24_TINY) || defined(LITTLEWIRE)
// for 3 pins solution TX mode is only left with additional powerDown/powerUp cycle
if (ce_pin == csn_pin) {
powerDown();
powerUp();
}
#endif
write_register(EN_RXADDR, static_cast<uint8_t>(read_register(EN_RXADDR) | _BV(pgm_read_byte(&child_pipe_enable[0])))); // Enable RX on pipe0
}
/****************************************************************************/
void RF24::powerDown(void)
{
ce(LOW); // Guarantee CE is low on powerDown
config_reg = static_cast<uint8_t>(config_reg & ~_BV(PWR_UP));
write_register(NRF_CONFIG, config_reg);
}
/****************************************************************************/
//Power up now. Radio will not power down unless instructed by MCU for config changes etc.
void RF24::powerUp(void)
{
// if not powered up then power up and wait for the radio to initialize
if (!(config_reg & _BV(PWR_UP))) {
config_reg |= _BV(PWR_UP);
write_register(NRF_CONFIG, config_reg);
// 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
delayMicroseconds(RF24_POWERUP_DELAY);
}
}
/******************************************************************/
#if defined(FAILURE_HANDLING) || defined(RF24_LINUX)
void RF24::errNotify()
{
#if defined(SERIAL_DEBUG) || defined(RF24_LINUX)
printf_P(PSTR("RF24 HARDWARE FAIL: Radio not responding, verify pin connections, wiring, etc.\r\n"));
#endif
#if defined(FAILURE_HANDLING)
failureDetected = 1;
#else
delay(5000);
#endif
}
#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) || defined(RF24_LINUX)
uint32_t timer = millis();
#endif // defined(FAILURE_HANDLING) || defined(RF24_LINUX)
while (!(get_status() & (_BV(TX_DS) | _BV(MAX_RT)))) {
#if defined(FAILURE_HANDLING) || defined(RF24_LINUX)
if (millis() - timer > 95) {
errNotify();
#if defined(FAILURE_HANDLING)
return 0;
#else
delay(100);
#endif
}
#endif
}
ce(LOW);
write_register(NRF_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 in 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 (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) || defined(RF24_LINUX)
if (millis() - timer > (timeout + 95)) {
errNotify();
#if defined(FAILURE_HANDLING)
return 0;
#endif
}
#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(NRF_STATUS, _BV(MAX_RT)); //Clear max retry flag
write_register(REUSE_TX_PL, RF24_NOP, true);
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 retries 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) || defined(RF24_LINUX)
uint32_t timer = millis();
#endif
//Blocking only if FIFO is full. This will loop and block until TX is successful or fail
while ((get_status() & (_BV(TX_FULL)))) {
if (status & _BV(MAX_RT)) {
return 0; //Return 0. The previous payload has not been retransmitted
// From the user perspective, if you get a 0, call txStandBy()
}
#if defined(FAILURE_HANDLING) || defined(RF24_LINUX)
if (millis() - timer > 95) {
errNotify();
#if defined(FAILURE_HANDLING)
return 0;
#endif // defined(FAILURE_HANDLING)
}
#endif
}
startFastWrite(buf, len, multicast); // Start Writing
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, bool startTx)
{ //TMRh20
write_payload(buf, len, multicast ? W_TX_PAYLOAD_NO_ACK : W_TX_PAYLOAD);
if (startTx) {
ce(HIGH);
}
}
/****************************************************************************/
//Added the original startWrite back in so users can still use interrupts, ack payloads, etc
//Allows the library to pass all tests
bool RF24::startWrite(const void* buf, uint8_t len, const bool multicast)
{
// Send the payload
write_payload(buf, len, multicast ? W_TX_PAYLOAD_NO_ACK : W_TX_PAYLOAD);
ce(HIGH);
#if !defined(F_CPU) || F_CPU > 20000000
delayMicroseconds(10);
#endif
ce(LOW);
return !(status & _BV(TX_FULL));
}
/****************************************************************************/
bool RF24::rxFifoFull()
{
return read_register(FIFO_STATUS) & _BV(RX_FULL);
}
/****************************************************************************/
uint8_t RF24::isFifo(bool about_tx)
{
return static_cast<uint8_t>((read_register(FIFO_STATUS) >> (4 * about_tx)) & 3);
}
/****************************************************************************/
bool RF24::isFifo(bool about_tx, bool check_empty)
{
return static_cast<bool>(isFifo(about_tx) & _BV(!check_empty));
}
/****************************************************************************/
bool RF24::txStandBy()
{
#if defined(FAILURE_HANDLING) || defined(RF24_LINUX)
uint32_t timeout = millis();
#endif
while (!(read_register(FIFO_STATUS) & _BV(TX_EMPTY))) {
if (status & _BV(MAX_RT)) {
write_register(NRF_STATUS, _BV(MAX_RT));
ce(LOW);
flush_tx(); //Non blocking, flush the data
return 0;
}
#if defined(FAILURE_HANDLING) || defined(RF24_LINUX)
if (millis() - timeout > 95) {
errNotify();
#if defined(FAILURE_HANDLING)
return 0;
#endif
}
#endif
}
ce(LOW); //Set STANDBY-I mode
return 1;
}
/****************************************************************************/
bool RF24::txStandBy(uint32_t timeout, bool startTx)
{
if (startTx) {
stopListening();
ce(HIGH);
}
uint32_t start = millis();
while (!(read_register(FIFO_STATUS) & _BV(TX_EMPTY))) {
if (status & _BV(MAX_RT)) {
write_register(NRF_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) || defined(RF24_LINUX)
if (millis() - start > (timeout + 95)) {
errNotify();
#if defined(FAILURE_HANDLING)
return 0;
#endif
}
#endif
}
ce(LOW); //Set STANDBY-I mode
return 1;
}
/****************************************************************************/
void RF24::maskIRQ(bool tx, bool fail, bool rx)
{
/* clear the interrupt flags */
config_reg = static_cast<uint8_t>(config_reg & ~(1 << MASK_MAX_RT | 1 << MASK_TX_DS | 1 << MASK_RX_DR));
/* set the specified interrupt flags */
config_reg = static_cast<uint8_t>(config_reg | fail << MASK_MAX_RT | tx << MASK_TX_DS | rx << MASK_RX_DR);
write_register(NRF_CONFIG, config_reg);
}
/****************************************************************************/
uint8_t RF24::getDynamicPayloadSize(void)
{
uint8_t result = read_register(R_RX_PL_WID);
if (result > 32) {
flush_rx();
delay(2);
return 0;
}
return result;
}
/****************************************************************************/
bool RF24::available(void)
{
uint8_t pipe = 0;
return available(&pipe);
}
/****************************************************************************/
bool RF24::available(uint8_t* pipe_num)
{
// get implied RX FIFO empty flag from status byte
uint8_t pipe = (get_status() >> RX_P_NO) & 0x07;
if (pipe > 5)
return 0;
// If the caller wants the pipe number, include that
if (pipe_num)
*pipe_num = pipe;