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DigistumpArduino/hardware/digistump/sam/libraries/RF24/librf24-rpi/librf24-bcm/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.
03/17/2013 : Charles-Henri Hallard (http://hallard.me)
Modified to use with Arduipi board http://hallard.me/arduipi
Changed to use modified bcm2835 library
*/
#include "./RF24_config.h"
#include "./RF24.h"
#include "./nRF24L01.h"
// Used for debug with my logic analyzer
//#include <unistd.h>
//#define GPIO_CTRL_PIN RPI_V2_GPIO_P1_07
//#define ctrl_pin(x) bcm2835_gpio_write(GPIO_CTRL_PIN, x)
/****************************************************************************/
uint8_t RF24::read_register(uint8_t reg, uint8_t* buf, uint8_t len)
{
uint8_t status;
uint8_t * prx = spi_rxbuff;
uint8_t * ptx = spi_txbuff;
uint8_t size = len + 1; // Add register value to transmit buffer
*ptx++ = ( R_REGISTER | ( REGISTER_MASK & reg ) );
while (len--)
*ptx++ = NOP ; // Dummy operation, just for reading
bcm2835_spi_transfernb( (char *) spi_txbuff, (char *) spi_rxbuff, size);
status = *prx++; // status is 1st byte of receive buffer
// decrement before to skip status byte
while ( --size )
*buf++ = *prx++;
return status;
}
/****************************************************************************/
uint8_t RF24::read_register(uint8_t reg)
{
uint8_t result;
uint8_t * prx = spi_rxbuff;
uint8_t * ptx = spi_txbuff;
*ptx++ = ( R_REGISTER | ( REGISTER_MASK & reg ) );
*ptx = NOP ; // Dummy operation, just for reading
bcm2835_spi_transfernb( (char *) spi_txbuff, (char *) spi_rxbuff, 2);
result = *++prx; // result is 2nd byte of receive buffer
return result;
}
/****************************************************************************/
uint8_t RF24::write_register(uint8_t reg, uint8_t value)
{
uint8_t status;
uint8_t * prx = spi_rxbuff;
uint8_t * ptx = spi_txbuff;
*ptx++ = ( W_REGISTER | ( REGISTER_MASK & reg ) );
*ptx = value ;
bcm2835_spi_transfernb( (char *) spi_txbuff, (char *) spi_rxbuff, 2);
status = *prx++; // status is 1st byte of receive buffer
if (debug)
printf("write_register(%02x,%02x)\r\n",reg,value);
return status;
}
/****************************************************************************/
uint8_t RF24::write_register(uint8_t reg, const uint8_t* buf, uint8_t len)
{
uint8_t status;
uint8_t * prx = spi_rxbuff;
uint8_t * ptx = spi_txbuff;
uint8_t size = len + 1; // Add register value to transmit buffer
*ptx++ = ( W_REGISTER | ( REGISTER_MASK & reg ) );
while ( len-- )
*ptx++ = *buf++;
bcm2835_spi_transfernb( (char *) spi_txbuff, (char *) spi_rxbuff, size);
status = *prx; // status is 1st byte of receive buffer
return status;
}
/****************************************************************************/
uint8_t RF24::write_payload(const void* buf, uint8_t len)
{
uint8_t status;
uint8_t * prx = spi_rxbuff;
uint8_t * ptx = spi_txbuff;
uint8_t size ;
const uint8_t* current = reinterpret_cast<const uint8_t*>(buf);
uint8_t data_len = min(len,payload_size);
uint8_t blank_len = dynamic_payloads_enabled ? 0 : payload_size - data_len;
size = data_len + blank_len + 1 ; // Add register value to transmit buffer
if (debug)
printf("[Writing %u bytes %u blanks]",data_len,blank_len);
*ptx++ = W_TX_PAYLOAD;
while ( data_len-- )
*ptx++ = *current++;
while ( blank_len-- )
*ptx++ = 0;
bcm2835_spi_transfernb( (char *) spi_txbuff, (char *) spi_rxbuff, size);
status = *prx; // status is 1st byte of receive buffer
return status;
}
/****************************************************************************/
uint8_t RF24::read_payload(void* buf, uint8_t len)
{
uint8_t status;
uint8_t * prx = spi_rxbuff;
uint8_t * ptx = spi_txbuff;
uint8_t size ;
uint8_t* current = reinterpret_cast<uint8_t*>(buf);
uint8_t data_len = min(len,payload_size);
uint8_t blank_len = dynamic_payloads_enabled ? 0 : payload_size - data_len;
size = data_len + blank_len + 1; // Add register value to transmit buffer
if (debug)
printf("[Reading %u bytes %u blanks]",data_len,blank_len);
*ptx++ = R_RX_PAYLOAD;
while(size--)
*ptx++ = NOP;
// Size has been lost during while, re affect
size = data_len + blank_len + 1; // Add register value to transmit buffer
bcm2835_spi_transfernb( (char *) spi_txbuff, (char *) spi_rxbuff, size);
// 1st byte is status
status = *prx++;
// Decrement before to skip 1st status byte
while ( --size )
*current++ = *prx++;
return status;
}
/****************************************************************************/
uint8_t RF24::flush_rx(void)
{
uint8_t status;
status = bcm2835_spi_transfer( FLUSH_RX );
return status;
}
/****************************************************************************/
uint8_t RF24::flush_tx(void)
{
uint8_t status;
status = bcm2835_spi_transfer( FLUSH_TX );
return status;
}
/****************************************************************************/
uint8_t RF24::get_status(void)
{
uint8_t status;
status = bcm2835_spi_transfer( NOP );
return status;
}
/****************************************************************************/
void RF24::print_status(uint8_t status)
{
printf("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) & 0b111),
(status & _BV(TX_FULL))?1:0
);
}
/****************************************************************************/
void RF24::print_observe_tx(uint8_t value)
{
printf("OBSERVE_TX=%02x: POLS_CNT=%x ARC_CNT=%x\r\n",
value,
(value >> PLOS_CNT) & 0b1111,
(value >> ARC_CNT) & 0b1111
);
}
/****************************************************************************/
void RF24::print_byte_register(const char* name, uint8_t reg, uint8_t qty)
{
char extra_tab = strlen(name) < 8 ? '\t' : 0;
printf("%s\t%c =", name, extra_tab);
while (qty--)
printf(" 0x%02x",read_register(reg++));
printf("\n");
}
/****************************************************************************/
void RF24::print_address_register(const char* name, uint8_t reg, uint8_t qty)
{
char extra_tab = strlen(name) < 8 ? '\t' : 0;
printf("%s\t%c =",name,extra_tab);
while (qty--)
{
uint8_t buffer[5];
read_register(reg++,buffer,sizeof buffer);
printf(" 0x");
uint8_t* bufptr = buffer + sizeof buffer;
while( --bufptr >= buffer )
printf("%02x",*bufptr);
}
printf("\r\n");
}
/****************************************************************************/
RF24::RF24(uint8_t _cepin, uint8_t _cspin, uint32_t _spi_speed):
ce_pin(_cepin), csn_pin(_cspin), spi_speed(_spi_speed), wide_band(true), p_variant(false),
payload_size(32), ack_payload_available(false), dynamic_payloads_enabled(false),
pipe0_reading_address(0)
{
}
/****************************************************************************/
void RF24::setChannel(uint8_t channel)
{
// TODO: This method could take advantage of the 'wide_band' calculation
// done in setChannel() to require certain channel spacing.
const uint8_t max_channel = 127;
write_register(RF_CH,min(channel,max_channel));
}
/****************************************************************************/
void RF24::setPayloadSize(uint8_t size)
{
const uint8_t max_payload_size = 32;
payload_size = min(size,max_payload_size);
}
/****************************************************************************/
uint8_t RF24::getPayloadSize(void)
{
return payload_size;
}
/****************************************************************************/
static const char rf24_datarate_e_str_0[] = "1MBPS";
static const char rf24_datarate_e_str_1[] = "2MBPS";
static const char rf24_datarate_e_str_2[] = "250KBPS";
static const char * const rf24_datarate_e_str_P[] = {
rf24_datarate_e_str_0,
rf24_datarate_e_str_1,
rf24_datarate_e_str_2,
};
static const char rf24_model_e_str_0[] = "nRF24L01";
static const char rf24_model_e_str_1[] = "nRF24L01+";
static const char * const rf24_model_e_str_P[] = {
rf24_model_e_str_0,
rf24_model_e_str_1,
};
static const char rf24_crclength_e_str_0[] = "Disabled";
static const char rf24_crclength_e_str_1[] = "8 bits";
static const char rf24_crclength_e_str_2[] = "16 bits" ;
static const char * const rf24_crclength_e_str_P[] = {
rf24_crclength_e_str_0,
rf24_crclength_e_str_1,
rf24_crclength_e_str_2,
};
static const char rf24_pa_dbm_e_str_0[] = "PA_MIN";
static const char rf24_pa_dbm_e_str_1[] = "PA_LOW";
static const char rf24_pa_dbm_e_str_2[] = "PA_HIGH";
static const char rf24_pa_dbm_e_str_3[] = "PA_MAX";
static const 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 char rf24_csn_e_str_0[] = "CE0 (PI Hardware Driven)";
static const char rf24_csn_e_str_1[] = "CE1 (PI Hardware Driven)";
static const char rf24_csn_e_str_2[] = "CE2 (PI Hardware Driven)";
static const char rf24_csn_e_str_3[] = "Custom GPIO Software Driven";
static const char * const rf24_csn_e_str_P[] = {
rf24_csn_e_str_0,
rf24_csn_e_str_1,
rf24_csn_e_str_2,
rf24_csn_e_str_3,
};
// Display NRF24L01 details
void RF24::printDetails(void)
{
printf("================ SPI Configuration ================\n" );
if (csn_pin < BCM2835_SPI_CS_NONE )
{
printf("CSN Pin \t = %s\n",rf24_csn_e_str_P[csn_pin]);
}
else
{
printf("CSN Pin \t = Custom GPIO%d%s\n", csn_pin,
csn_pin==RPI_V2_GPIO_P1_26 ? " (CE1) Software Driven" : "" );
}
printf("CE Pin \t = Custom GPIO%d\n", ce_pin );
// SPI Bus Speed
printf("Clock Speed\t = " );
switch (spi_speed)
{
case BCM2835_SPI_SPEED_64MHZ : printf("64 Mhz"); break ;
case BCM2835_SPI_SPEED_32MHZ : printf("32 Mhz"); break ;
case BCM2835_SPI_SPEED_16MHZ : printf("16 Mhz"); break ;
case BCM2835_SPI_SPEED_8MHZ : printf("8 Mhz"); break ;
case BCM2835_SPI_SPEED_4MHZ : printf("4 Mhz"); break ;
case BCM2835_SPI_SPEED_2MHZ : printf("2 Mhz"); break ;
case BCM2835_SPI_SPEED_1MHZ : printf("1 Mhz"); break ;
case BCM2835_SPI_SPEED_512KHZ: printf("512 KHz"); break ;
case BCM2835_SPI_SPEED_256KHZ: printf("256 KHz"); break ;
case BCM2835_SPI_SPEED_128KHZ: printf("128 KHz"); break ;
case BCM2835_SPI_SPEED_64KHZ : printf("64 KHz"); break ;
case BCM2835_SPI_SPEED_32KHZ : printf("32 KHz"); break ;
case BCM2835_SPI_SPEED_16KHZ : printf("16 KHz"); break ;
case BCM2835_SPI_SPEED_8KHZ : printf("8 KHz"); break ;
default : printf("Probably Bad !!!"); break ;
}
printf("\n");
printf("================ NRF Configuration ================\n" );
print_status(get_status());
print_address_register("RX_ADDR_P0-1",RX_ADDR_P0,2);
print_byte_register("RX_ADDR_P2-5",RX_ADDR_P2,4);
print_address_register("TX_ADDR",TX_ADDR);
print_byte_register("RX_PW_P0-6",RX_PW_P0,6);
print_byte_register("EN_AA",EN_AA);
print_byte_register("EN_RXADDR",EN_RXADDR);
print_byte_register("RF_CH",RF_CH);
print_byte_register("RF_SETUP",RF_SETUP);
print_byte_register("CONFIG",CONFIG);
print_byte_register("DYNPD/FEATURE",DYNPD,2);
printf("Data Rate\t = %s\r\n",rf24_datarate_e_str_P[getDataRate()]);
printf("Model\t\t = %s\r\n",rf24_model_e_str_P[isPVariant()]);
printf("CRC Length\t = %s\r\n",rf24_crclength_e_str_P[getCRCLength()]);
printf("PA Power\t = %s\r\n",rf24_pa_dbm_e_str_P[getPALevel()]);
}
/****************************************************************************/
bool RF24::begin(void)
{
debug = false;
//debug = true;
// Init BCM2835 chipset for talking with us
if (!bcm2835_init())
return false;
// Initialise the CE pin of NRF24 (chip enable)
bcm2835_gpio_fsel(ce_pin, BCM2835_GPIO_FSEL_OUTP);
bcm2835_gpio_write(ce_pin, LOW);
// used to drive custom I/O to trigger my logic analyser
// bcm2835_gpio_fsel(GPIO_CTRL_PIN , BCM2835_GPIO_FSEL_OUTP);
// start the SPI library:
// Note the NRF24 wants mode 0, MSB first and default to 1 Mbps
bcm2835_spi_setBitOrder(BCM2835_SPI_BIT_ORDER_MSBFIRST);
bcm2835_spi_setDataMode(BCM2835_SPI_MODE0);
// Set SPI bus Speed
bcm2835_spi_setClockSpeed(spi_speed);
// This initialize the SPI bus with
// csn pin as chip select (custom or not)
bcm2835_spi_begin(csn_pin);
// wait 100ms
delay(100);
// 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.
//printf("write_register(%02X, %02X)\n", SETUP_RETR, (0b0100 << ARD) | (0b1111 << ARC));
write_register(SETUP_RETR,(0b0100 << ARD) | (0b1111 << ARC));
// Restore our default PA level
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
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();
return true;
}
/****************************************************************************/
void RF24::startListening(void)
{
write_register(CONFIG, read_register(CONFIG) | _BV(PWR_UP) | _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)
write_register(RX_ADDR_P0, reinterpret_cast<const uint8_t*>(&pipe0_reading_address), 5);
// Flush buffers
flush_rx();
flush_tx();
// Go!
bcm2835_gpio_write(ce_pin, HIGH);
// wait for the radio to come up (130us actually only needed)
delayMicroseconds(130);
}
/****************************************************************************/
void RF24::stopListening(void)
{
bcm2835_gpio_write(ce_pin, LOW);
flush_tx();
flush_rx();
}
/****************************************************************************/
void RF24::powerDown(void)
{
write_register(CONFIG,read_register(CONFIG) & ~_BV(PWR_UP));
}
/****************************************************************************/
void RF24::powerUp(void)
{
write_register(CONFIG,read_register(CONFIG) | _BV(PWR_UP));
}
/******************************************************************/
bool RF24::write( const void* buf, uint8_t len )
{
bool result = false;
// Begin the write
startWrite(buf,len);
// ------------
// At this point we could return from a non-blocking write, and then call
// the rest after an interrupt
// Instead, we are going to block here until we get TX_DS (transmission completed and ack'd)
// or MAX_RT (maximum retries, transmission failed). Also, we'll timeout in case the radio
// is flaky and we get neither.
// IN the end, the send should be blocking. It comes back in 60ms worst case, or much faster
// if I tighted up the retry logic. (Default settings will be 1500us.
// Monitor the send
uint8_t observe_tx;
uint8_t status;
uint32_t sent_at = millis();
const unsigned long timeout = 500; //ms to wait for timeout
do
{
status = read_register(OBSERVE_TX,&observe_tx,1);
if (debug)
printf("%02X", observe_tx);
}
while( ! ( status & ( _BV(TX_DS) | _BV(MAX_RT) ) ) && ( millis() - sent_at < timeout ) );
// The part above is what you could recreate with your own interrupt handler,
// and then call this when you got an interrupt
// ------------
// Call this when you get an interrupt
// The status tells us three things
// * The send was successful (TX_DS)
// * The send failed, too many retries (MAX_RT)
// * There is an ack packet waiting (RX_DR)
bool tx_ok, tx_fail;
whatHappened(tx_ok,tx_fail,ack_payload_available);
//printf("%u%u%u\r\n",tx_ok,tx_fail,ack_payload_available);
result = tx_ok;
if (debug)
printf(result?"...OK.":"...Failed");
// Handle the ack packet
if ( ack_payload_available )
{
ack_payload_length = getDynamicPayloadSize();
if (debug )
printf("[AckPacket]/%d", ack_payload_length);
}
// Yay, we are done.
// Power down
powerDown();
// Flush buffers (Is this a relic of past experimentation, and not needed anymore??)
flush_tx();
return result;
}
/****************************************************************************/
void RF24::startWrite( const void* buf, uint8_t len )
{
// Transmitter power-up
write_register(CONFIG, ( read_register(CONFIG) | _BV(PWR_UP) ) & ~_BV(PRIM_RX) );
delayMicroseconds(150);
// Send the payload
write_payload( buf, len );
// Allons!
bcm2835_gpio_write(ce_pin, HIGH);
delayMicroseconds(15);
bcm2835_gpio_write(ce_pin, LOW);
}
/****************************************************************************/
uint8_t RF24::getDynamicPayloadSize(void)
{
uint8_t result = 0;
bcm2835_spi_transfer( R_RX_PL_WID );
result = bcm2835_spi_transfer(0xff);
return result;
}
/****************************************************************************/
bool RF24::available(void)
{
return available(NULL);
}
/****************************************************************************/
bool RF24::available(uint8_t* pipe_num)
{
uint8_t status = get_status();
// Too noisy, enable if you really want lots o data!!
// if (debug) print_status(status);
bool result = ( status & _BV(RX_DR) );
if (result)
{
// If the caller wants the pipe number, include that
if ( pipe_num )
*pipe_num = ( status >> RX_P_NO ) & 0b111;
// Clear the status bit
// ??? Should this REALLY be cleared now? Or wait until we
// actually READ the payload?
write_register(STATUS,_BV(RX_DR) );
// Handle ack payload receipt
if ( status & _BV(TX_DS) )
{
write_register(STATUS,_BV(TX_DS));
}
}
return result;
}
/****************************************************************************/
bool RF24::read( void* buf, uint8_t len )
{
// Fetch the payload
read_payload( buf, len );
// was this the last of the data available?
return read_register(FIFO_STATUS) & _BV(RX_EMPTY);
}
/****************************************************************************/
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), 5);
write_register(TX_ADDR, reinterpret_cast<uint8_t*>(&value), 5);
const uint8_t max_payload_size = 32;
write_register(RX_PW_P0,min(payload_size,max_payload_size));
}
/****************************************************************************/
static const uint8_t child_pipe[] =
{
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[] =
{
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[] =
{
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)
pipe0_reading_address = address;
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), 5);
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::toggle_features(void)
{
bcm2835_spi_transfer( ACTIVATE );
bcm2835_spi_transfer( 0x73 );
}
/****************************************************************************/
void RF24::enableDynamicPayloads(void)
{
// Enable dynamic payload throughout the system
write_register(FEATURE,read_register(FEATURE) | _BV(EN_DPL) );
// If it didn't work, the features are not enabled
if ( ! read_register(FEATURE) )
{
// So enable them and try again
toggle_features();
write_register(FEATURE,read_register(FEATURE) | _BV(EN_DPL) );
}
if (debug)
printf("FEATURE=%i\r\n",read_register(FEATURE));
// Enable dynamic payload on all pipes
//
// Not sure the use case of only having dynamic payload on certain
// pipes, so the library does not support it.
write_register(DYNPD,read_register(DYNPD) | _BV(DPL_P5) | _BV(DPL_P4) | _BV(DPL_P3) | _BV(DPL_P2) | _BV(DPL_P1) | _BV(DPL_P0));
dynamic_payloads_enabled = true;
}
/****************************************************************************/
void RF24::enableAckPayload(void)
{
//
// enable ack payload and dynamic payload features
//
write_register(FEATURE,read_register(FEATURE) | _BV(EN_ACK_PAY) | _BV(EN_DPL) );
// If it didn't work, the features are not enabled
if ( ! read_register(FEATURE) )
{
// So enable them and try again
toggle_features();
write_register(FEATURE,read_register(FEATURE) | _BV(EN_ACK_PAY) | _BV(EN_DPL) );
}
if (debug)
printf("FEATURE=%i\r\n",read_register(FEATURE));
//
// Enable dynamic payload on pipes 0 & 1
//
write_register(DYNPD,read_register(DYNPD) | _BV(DPL_P1) | _BV(DPL_P0));
}
/****************************************************************************/
void RF24::writeAckPayload(uint8_t pipe, const void* buf, uint8_t len)
{
const uint8_t* current = reinterpret_cast<const uint8_t*>(buf);
bcm2835_spi_transfer( W_ACK_PAYLOAD | ( pipe & 0b111 ) );
const uint8_t max_payload_size = 32;
uint8_t data_len = min(len,max_payload_size);
while ( data_len-- )
bcm2835_spi_transfer(*current++);
}
/****************************************************************************/
bool RF24::isAckPayloadAvailable(void)
{
bool result = ack_payload_available;
ack_payload_available = false;
return result;
}
/****************************************************************************/
bool RF24::isPVariant(void)
{
return p_variant ;
}
/****************************************************************************/
void RF24::setAutoAck(bool enable)
{
if ( enable )
write_register(EN_AA, 0b111111);
else
write_register(EN_AA, 0);
}
/****************************************************************************/
void RF24::setAutoAck( uint8_t pipe, bool enable )
{
if ( pipe <= 6 )
{
uint8_t en_aa = read_register( EN_AA ) ;
if( enable )
{
en_aa |= _BV(pipe) ;
}
else
{
en_aa &= ~_BV(pipe) ;
}
write_register( EN_AA, en_aa ) ;
}
}
/****************************************************************************/
bool RF24::testCarrier(void)
{
return ( read_register(CD) & 1 );
}
/****************************************************************************/
bool RF24::testRPD(void)
{
return ( read_register(RPD) & 1 ) ;
}
/****************************************************************************/
void RF24::setPALevel(rf24_pa_dbm_e level)
{
uint8_t setup = read_register(RF_SETUP) ;
setup &= ~(_BV(RF_PWR_LOW) | _BV(RF_PWR_HIGH)) ;
// switch uses RAM (evil!)
if ( level == RF24_PA_MAX )
{
setup |= (_BV(RF_PWR_LOW) | _BV(RF_PWR_HIGH)) ;
}
else if ( level == RF24_PA_HIGH )
{
setup |= _BV(RF_PWR_HIGH) ;
}
else if ( level == RF24_PA_LOW )
{
setup |= _BV(RF_PWR_LOW);
}
else if ( level == RF24_PA_MIN )
{
// nothing
}
else if ( level == RF24_PA_ERROR )
{
// On error, go to maximum PA
setup |= (_BV(RF_PWR_LOW) | _BV(RF_PWR_HIGH)) ;
}
write_register( RF_SETUP, setup ) ;
}
/****************************************************************************/
rf24_pa_dbm_e RF24::getPALevel(void)
{
rf24_pa_dbm_e result = RF24_PA_ERROR ;
uint8_t power = read_register(RF_SETUP) & (_BV(RF_PWR_LOW) | _BV(RF_PWR_HIGH)) ;
// switch uses RAM (evil!)
if ( power == (_BV(RF_PWR_LOW) | _BV(RF_PWR_HIGH)) )
{
result = RF24_PA_MAX ;
}
else if ( power == _BV(RF_PWR_HIGH) )
{
result = RF24_PA_HIGH ;
}
else if ( power == _BV(RF_PWR_LOW) )
{
result = RF24_PA_LOW ;
}
else
{
result = RF24_PA_MIN ;
}
return result ;
}
/****************************************************************************/
bool RF24::setDataRate(rf24_datarate_e speed)
{
bool result = false;
uint8_t setup = read_register(RF_SETUP) ;
// HIGH and LOW '00' is 1Mbs - our default
wide_band = false ;
setup &= ~(_BV(RF_DR_LOW) | _BV(RF_DR_HIGH)) ;
if( speed == RF24_250KBPS )
{
// Must set the RF_DR_LOW to 1; RF_DR_HIGH (used to be RF_DR) is already 0
// Making it '10'.
wide_band = false ;
setup |= _BV( RF_DR_LOW ) ;
}
else
{
// Set 2Mbs, RF_DR (RF_DR_HIGH) is set 1
// Making it '01'
if ( speed == RF24_2MBPS )
{
wide_band = true ;
setup |= _BV(RF_DR_HIGH);
}
else
{
// 1Mbs
wide_band = false ;
}
}
write_register(RF_SETUP,setup);
// Verify our result
if ( read_register(RF_SETUP) == setup )
{
result = true;
}
else
{
wide_band = false;
}
return result;
}
/****************************************************************************/
rf24_datarate_e RF24::getDataRate( void )
{
rf24_datarate_e result ;
uint8_t dr = read_register(RF_SETUP) & (_BV(RF_DR_LOW) | _BV(RF_DR_HIGH));
// switch uses RAM (evil!)
// Order matters in our case below
if ( dr == _BV(RF_DR_LOW) )
{
// '10' = 250KBPS
result = RF24_250KBPS ;
}
else if ( dr == _BV(RF_DR_HIGH) )
{
// '01' = 2MBPS
result = RF24_2MBPS ;
}
else
{
// '00' = 1MBPS
result = RF24_1MBPS ;
}
return result ;
}
/****************************************************************************/
void RF24::setCRCLength(rf24_crclength_e length)
{
uint8_t config = read_register(CONFIG) & ~( _BV(CRCO) | _BV(EN_CRC)) ;
// switch uses RAM (evil!)
if ( length == RF24_CRC_DISABLED )
{
// Do nothing, we turned it off above.
}
else if ( length == RF24_CRC_8 )
{
config |= _BV(EN_CRC);
}
else
{
config |= _BV(EN_CRC);
config |= _BV( CRCO );
}
write_register( CONFIG, config ) ;
}
/****************************************************************************/
rf24_crclength_e RF24::getCRCLength(void)
{
rf24_crclength_e result = RF24_CRC_DISABLED;
uint8_t config = read_register(CONFIG) & ( _BV(CRCO) | _BV(EN_CRC)) ;
if ( config & _BV(EN_CRC ) )
{
if ( config & _BV(CRCO) )
result = RF24_CRC_16;
else
result = RF24_CRC_8;
}
return result;
}
/****************************************************************************/
void RF24::disableCRC( void )
{
uint8_t disable = read_register(CONFIG) & ~_BV(EN_CRC) ;
write_register( CONFIG, disable ) ;
}
/****************************************************************************/
void RF24::setRetries(uint8_t delay, uint8_t count)
{
write_register(SETUP_RETR,(delay&0xf)<<ARD | (count&0xf)<<ARC);
}
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