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Hello i have created a setup of Tx and Rx By using the C Library for NRF24L01+ i have installed LED indication for checking the Transmission has perfectly happened or not. If transmission is not proper and ack is not received LED remains on at PORTA1. In my case it remains on as transmission is not reaching to receiver part and hence no acknolwedgement received which keeps led on. Please find below the code for both Tx and Rx Part...and please guide me what wrong i have done. Also also how to debug NRF24L01 SPI Communications ? Please help...
Compiler used is Mikroc C for PIC Pro.
NRF24L01+ Tx Code
NRF24L01+ Rx Code:
Compiler used is Mikroc C for PIC Pro.
NRF24L01+ Tx Code
Code:
/* Memory Map */
#define CONFIG 0x00
#define EN_AA 0x01
#define EN_RXADDR 0x02
#define SETUP_AW 0x03
#define SETUP_RETR 0x04
#define RF_CH 0x05
#define RF_SETUP 0x06
#define STATUS 0x07
#define OBSERVE_TX 0x08
#define CD 0x09
#define RX_ADDR_P0 0x0A
#define RX_ADDR_P1 0x0B
#define RX_ADDR_P2 0x0C
#define RX_ADDR_P3 0x0D
#define RX_ADDR_P4 0x0E
#define RX_ADDR_P5 0x0F
#define TX_ADDR 0x10
#define RX_PW_P0 0x11
#define RX_PW_P1 0x12
#define RX_PW_P2 0x13
#define RX_PW_P3 0x14
#define RX_PW_P4 0x15
#define RX_PW_P5 0x16
#define FIFO_STATUS 0x17
#define DYNPD 0x1C
/* Bit Mnemonics */
/* configuratio nregister */
#define MASK_RX_DR 6
#define MASK_TX_DS 5
#define MASK_MAX_RT 4
#define EN_CRC 3
#define CRCO 2
#define PWR_UP 1
#define PRIM_RX 0
/* enable auto acknowledgment */
#define ENAA_P5 5
#define ENAA_P4 4
#define ENAA_P3 3
#define ENAA_P2 2
#define ENAA_P1 1
#define ENAA_P0 0
/* enable rx addresses */
#define ERX_P5 5
#define ERX_P4 4
#define ERX_P3 3
#define ERX_P2 2
#define ERX_P1 1
#define ERX_P0 0
/* setup of address width */
#define AW 0 /* 2 bits */
/* setup of auto re-transmission */
#define ARD 4 /* 4 bits */
#define ARC 0 /* 4 bits */
/* RF setup register */
#define PLL_LOCK 4
#define RF_DR 3
#define RF_PWR 1 /* 2 bits */
/* general status register */
#define RX_DR 6
#define TX_DS 5
#define MAX_RT 4
#define RX_P_NO 1 /* 3 bits */
#define TX_FULL 0
/* transmit observe register */
#define PLOS_CNT 4 /* 4 bits */
#define ARC_CNT 0 /* 4 bits */
/* fifo status */
#define TX_REUSE 6
#define FIFO_FULL 5
#define TX_EMPTY 4
#define RX_FULL 1
#define RX_EMPTY 0
/* dynamic length */
#define DPL_P0 0
#define DPL_P1 1
#define DPL_P2 2
#define DPL_P3 3
#define DPL_P4 4
#define DPL_P5 5
/* Instruction Mnemonics */
#define R_REGISTER 0x00 /* last 4 bits will indicate reg. address */
#define W_REGISTER 0x20 /* last 4 bits will indicate reg. address */
#define REGISTER_MASK 0x1F
#define R_RX_PAYLOAD 0x61
#define W_TX_PAYLOAD 0xA0
#define FLUSH_TX 0xE1
#define FLUSH_RX 0xE2
#define REUSE_TX_PL 0xE3
#define ACTIVATE 0x50
#define R_RX_PL_WID 0x60
#define NOP 0xFF
/// hardware spi pin defined
#define CS_Pin RB0_bit //set port as output
#define CE_Pin RB4_bit //set port as output
#define SCK_Pin RB1_bit //set port as output
#define Mosi_Pin RB2_bit //set port as output
#define Miso_Pin RB3_bit //set port as input
#define HIGH 1
#define LOW 0
//#ifndef NRF24
#define NRF24
//#include "nRF24L01.h"
//#include <stdint.h>
#define LOW 0
#define HIGH 1
#define nrf24_ADDR_LEN 5
#define nrf24_CONFIG ((1<<EN_CRC)|(0<<CRCO))
#define NRF24_TRANSMISSON_OK 0
#define NRF24_MESSAGE_LOST 1
// spi pins defined for PIC16F628A
sbit Chip_Select at RB0_bit;
sbit SoftSpi_CLK at RB1_bit;
sbit SoftSpi_SDI at RB2_bit;
sbit SoftSpi_SDO at RB3_bit;
sbit CE_Pin_select at RB4_bit;
sbit Chip_Select_Direction at TRISB0_bit; //csn PIN
sbit SoftSpi_CLK_Direction at TRISB1_bit; //SCK
sbit SoftSpi_SDI_Direction at TRISB2_bit; //MISO
sbit SoftSpi_SDO_Direction at TRISB3_bit; //MOSI
// End DAC module connections
void nrf24_ce_digitalwrite(short int state)
{
if (state)
{
CE_Pin = 1;
}
else
{
CE_Pin = 0;
}
}
void nrf24_csn_digitalwrite(short int state)
{
if (state)
{
CS_Pin = 1;
}
else
{
CS_Pin = 0;
}
}
void nrf24_sck_digitalwrite(short int state)
{
if (state)
{
SCK_Pin = 1;
}
else
{
SCK_Pin = 0;
}
}
void nrf24_mosi_digitalwrite(short int state)
{
if (state)
{
Mosi_Pin = 1;
}
else
{
Mosi_Pin = 0;
}
}
short int nrf24_miso_digitalread()
{
return (Miso_Pin);
}
/* software spi routine */
unsigned short spi_transfer(unsigned short tx)
{
unsigned short i = 0;
short int rs = 0;
nrf24_sck_digitalWrite(LOW);
for(i=0;i<8;i++)
{
if(tx & (1<<(7-i)))
{
nrf24_mosi_digitalWrite(HIGH);
}
else
{
nrf24_mosi_digitalWrite(LOW);
}
nrf24_sck_digitalWrite(HIGH);
rs = rs << 1;
if(nrf24_miso_digitalRead())
{
rs |= 0x01;
}
nrf24_sck_digitalWrite(LOW);
}
return rs;
}
/* send and receive multiple bytes over SPI */
void nrf24_transferSync(unsigned short* dataout,unsigned short* datain,unsigned short len)
{
unsigned int i;
for(i=0;i<len;i++)
{
datain[i] = spi_transfer(dataout[i]);
}
}
//send multiple bytes over SPI
void nrf24_transmitSync(unsigned short* dataout,unsigned short len)
{
unsigned int i;
for(i=0;i<len;i++)
{
spi_transfer(dataout[i]);
}
}
//Clocks only one byte into the given nrf24 register */
void nrf24_configRegister(unsigned short reg, unsigned short value)
{
nrf24_csn_digitalWrite(LOW);
spi_transfer(W_REGISTER | (REGISTER_MASK & reg));
spi_transfer(value);
nrf24_csn_digitalWrite(HIGH);
}
/* Read single register from nrf24 */
void nrf24_readRegister(unsigned short reg, unsigned short* value, unsigned short len)
{
nrf24_csn_digitalWrite(LOW);
spi_transfer(R_REGISTER | (REGISTER_MASK & reg));
nrf24_transferSync(value,value,len);
nrf24_csn_digitalWrite(HIGH);
}
/* Write to a single register of nrf24 */
void nrf24_writeRegister(unsigned short reg, unsigned short* value, unsigned short len)
{
nrf24_csn_digitalWrite(LOW);
spi_transfer(W_REGISTER | (REGISTER_MASK & reg));
nrf24_transmitSync(value,len);
nrf24_csn_digitalWrite(HIGH);
}
unsigned short payload_len;
// init the hardware pins
void nrf24_init()
{
//nrf24_setupPins();
nrf24_ce_digitalWrite(LOW);
nrf24_csn_digitalWrite(HIGH);
}
void nrf24_powerUpRx()
{
nrf24_csn_digitalWrite(LOW);
spi_transfer(FLUSH_RX);
nrf24_csn_digitalWrite(HIGH);
nrf24_configRegister(STATUS,(1<<RX_DR)|(1<<TX_DS)|(1<<MAX_RT));
nrf24_ce_digitalWrite(LOW);
nrf24_configRegister(CONFIG,nrf24_CONFIG|((1<<PWR_UP)|(1<<PRIM_RX)));
nrf24_ce_digitalWrite(HIGH);
}
void nrf24_config(unsigned short channel, unsigned short pay_length)
{
/* Use static payload length ... */
payload_len = pay_length;
// Set RF channel
nrf24_configRegister(RF_CH,channel);
// Set length of incoming payload
nrf24_configRegister(RX_PW_P0, 0x00); // Auto-ACK pipe ...
nrf24_configRegister(RX_PW_P1, payload_len); // Data payload pipe
nrf24_configRegister(RX_PW_P2, 0x00); // Pipe not used
nrf24_configRegister(RX_PW_P3, 0x00); // Pipe not used
nrf24_configRegister(RX_PW_P4, 0x00); // Pipe not used
nrf24_configRegister(RX_PW_P5, 0x00); // Pipe not used
// 1 Mbps, TX gain: 0dbm
nrf24_configRegister(RF_SETUP, (0<<RF_DR)|((0x03)<<RF_PWR));
// CRC enable, 1 byte CRC length
nrf24_configRegister(CONFIG,nrf24_CONFIG);
// Auto Acknowledgment
nrf24_configRegister(EN_AA,(1<<ENAA_P0)|(1<<ENAA_P1)|(0<<ENAA_P2)|(0<<ENAA_P3)|(0<<ENAA_P4)|(0<<ENAA_P5));
// Enable RX addresses
nrf24_configRegister(EN_RXADDR,(1<<ERX_P0)|(1<<ERX_P1)|(0<<ERX_P2)|(0<<ERX_P3)|(0<<ERX_P4)|(0<<ERX_P5));
// Auto retransmit delay: 1000 us and Up to 15 retransmit trials
nrf24_configRegister(SETUP_RETR,(0x04<<ARD)|(0x0F<<ARC));
// Dynamic length configurations: No dynamic length
nrf24_configRegister(DYNPD,(0<<DPL_P0)|(0<<DPL_P1)|(0<<DPL_P2)|(0<<DPL_P3)|(0<<DPL_P4)|(0<<DPL_P5));
// Start listening
nrf24_powerUpRx();
}
void nrf24_powerUpTx()
{
nrf24_configRegister(STATUS,(1<<RX_DR)|(1<<TX_DS)|(1<<MAX_RT));
nrf24_configRegister(CONFIG,nrf24_CONFIG|((1<<PWR_UP)|(0<<PRIM_RX)));
}
void nrf24_powerDown()
{
nrf24_ce_digitalWrite(LOW);
nrf24_configRegister(CONFIG,nrf24_CONFIG);
}
/* Set the RX address */
void nrf24_rx_address(unsigned short * adr)
{
nrf24_ce_digitalWrite(LOW);
nrf24_writeRegister(RX_ADDR_P1,adr,nrf24_ADDR_LEN);
nrf24_ce_digitalWrite(HIGH);
}
/* Set the RX address
void nrf24_rx_address(unsigned short * adr)
{
nrf24_ce_digitalWrite(LOW);
nrf24_writeRegister(RX_ADDR_P1,adr,nrf24_ADDR_LEN);
nrf24_ce_digitalWrite(HIGH);
}
*/
/* Returns the payload length */
unsigned short nrf24_payload_length()
{
return payload_len;
}
/* Set the TX address */
void nrf24_tx_address(unsigned short* adr)
{
/* RX_ADDR_P0 must be set to the sending addr for auto ack to work. */
nrf24_writeRegister(RX_ADDR_P0,adr,nrf24_ADDR_LEN);
nrf24_writeRegister(TX_ADDR,adr,nrf24_ADDR_LEN);
}
/* Checks if receive FIFO is empty or not */
unsigned short nrf24_rxFifoEmpty()
{
unsigned short fifoStatus;
nrf24_readRegister(FIFO_STATUS,&fifoStatus,1);
return (fifoStatus & (1 << RX_EMPTY));
}
/* Checks if data is available for reading */
/* Returns 1 if data is ready ... */
unsigned short nrf24_dataReady()
{
// See note in getData() function - just checking RX_DR isn't good enough
// unsigned short status = nrf24_getStatus();
// We can short circuit on RX_DR, but if it's not set, we still need
// to check the FIFO for any pending packets
if ( status & (1 << RX_DR) )
{
return 1;
}
return !nrf24_rxFifoEmpty();;
}
/* Returns the length of data waiting in the RX fifo */
unsigned short nrf24_payloadLength()
{
unsigned short status;
nrf24_csn_digitalWrite(LOW);
spi_transfer(R_RX_PL_WID);
status = spi_transfer(0x00);
nrf24_csn_digitalWrite(HIGH);
return status;
}
/* Reads payload bytes into data array */
void nrf24_getData(unsigned int* data1)
{
/* Pull down chip select */
nrf24_csn_digitalWrite(LOW);
/* Send cmd to read rx payload */
spi_transfer( R_RX_PAYLOAD );
/* Read payload */
nrf24_transferSync(data1,data1,payload_len);
/* Pull up chip select */
nrf24_csn_digitalWrite(HIGH);
/* Reset status register */
nrf24_configRegister(STATUS,(1<<RX_DR));
}
/* Returns the number of retransmissions occured for the last message */
unsigned short nrf24_retransmissionCount()
{
unsigned short rv;
nrf24_readRegister(OBSERVE_TX,&rv,1);
rv = rv & 0x0F;
return rv;
}
// Sends a data package to the default address. Be sure to send the correct
// amount of bytes as configured as payload on the receiver.
void nrf24_send(unsigned short* value)
{
/* Go to Standby-I first */
nrf24_ce_digitalWrite(LOW);
/* Set to transmitter mode , Power up if needed */
nrf24_powerUpTx();
/* Do we really need to flush TX fifo each time ? */
// #if 1
/* Pull down chip select */
nrf24_csn_digitalWrite(LOW);
/* Write cmd to flush transmit FIFO */
spi_transfer(FLUSH_TX);
/* Pull up chip select */
nrf24_csn_digitalWrite(HIGH);
// #endif
/* Pull down chip select */
nrf24_csn_digitalWrite(LOW);
/* Write cmd to write payload */
spi_transfer(W_TX_PAYLOAD);
/* Write payload */
nrf24_transmitSync(value,payload_len);
/* Pull up chip select */
nrf24_csn_digitalWrite(HIGH);
/* Start the transmission */
nrf24_ce_digitalWrite(HIGH);
}
unsigned short nrf24_getStatus()
{
unsigned short rv;
nrf24_csn_digitalWrite(LOW);
rv = spi_transfer(NOP);
nrf24_csn_digitalWrite(HIGH);
return rv;
}
unsigned short nrf24_lastMessageStatus()
{
unsigned short rv;
rv = nrf24_getStatus();
/* Transmission went OK */
if((rv & ((1 << TX_DS))))
{
return NRF24_TRANSMISSON_OK;
}
/* Maximum retransmission count is reached */
/* Last message probably went missing ... */
else if((rv & ((1 << MAX_RT))))
{
return NRF24_MESSAGE_LOST;
}
/* Probably still sending ... */
else
{
return 0xFF;
}
}
unsigned short nrf24_isSending()
{
unsigned short status;
/* read the current status */
status = nrf24_getStatus();
/* if sending successful (TX_DS) or max retries exceded (MAX_RT). */
if((status & ((1 << TX_DS) | (1 << MAX_RT))))
{
return 0; /* false */
}
return 1; /* true */
}
void nrf24_SETUP_PINS()
{
CMCON |= 7;
TRISB = 0b00001000;
TRISA = 0b00000000;
//nothing required here as we have already defined the pins and set their direcitons.(input/output)
}
//before main initilization
unsigned int temp;
unsigned int q = 0;
unsigned int data_array[4];
unsigned int tx_address[5] = {0xE7,0xE7,0xE7,0xE7,0xE7};
unsigned int rx_address[5] = {0xE7,0xE7,0xE7,0xE7,0xE7};
int main() {
//CMCON = 0X07;
CMCON |= 7;
TRISB = 0b00001000;
TRISA = 0b00000001;
nrf24_init();
/* Channel #2 , payload length: 4 */
nrf24_config(2,4);
/* Set the device addresses */
nrf24_tx_address(tx_address);
nrf24_rx_address(rx_address);
while(1)
{
/* Fill the data buffer */
data_array[0] = 0x01;
data_array[1] = 0x00;
data_array[2] = 0x00;
data_array[3] = 0x00;
/* Automatically goes to TX mode */
nrf24_send(data_array);
/* Wait for transmission to end */
while(nrf24_isSending());
/* Make analysis on last tranmission attempt */
temp = nrf24_lastMessageStatus();
if(temp == NRF24_TRANSMISSON_OK)
{
PORTA.F1 = 0; // LED off
// xprintf("> Tranmission went OK\r\n");
}
else if(temp == NRF24_MESSAGE_LOST)
{
PORTA.F1 = 1; // LED on
// xprintf("> Message is lost ...\r\n");
}
/* Retranmission count indicates the tranmission quality */
temp = nrf24_retransmissionCount();
// xprintf("> Retranmission count: %d\r\n",temp);
/* Optionally, go back to RX mode ... */
nrf24_powerUpRx();
/* Or you might want to power down after TX */
// nrf24_powerDown();
/* Wait a little ... */
delay_ms(10);
}
}NRF24L01+ Rx Code:
Code:
/* Memory Map */
#define CONFIG 0x00
#define EN_AA 0x01
#define EN_RXADDR 0x02
#define SETUP_AW 0x03
#define SETUP_RETR 0x04
#define RF_CH 0x05
#define RF_SETUP 0x06
#define STATUS 0x07
#define OBSERVE_TX 0x08
#define CD 0x09
#define RX_ADDR_P0 0x0A
#define RX_ADDR_P1 0x0B
#define RX_ADDR_P2 0x0C
#define RX_ADDR_P3 0x0D
#define RX_ADDR_P4 0x0E
#define RX_ADDR_P5 0x0F
#define TX_ADDR 0x10
#define RX_PW_P0 0x11
#define RX_PW_P1 0x12
#define RX_PW_P2 0x13
#define RX_PW_P3 0x14
#define RX_PW_P4 0x15
#define RX_PW_P5 0x16
#define FIFO_STATUS 0x17
#define DYNPD 0x1C
/* Bit Mnemonics */
/* configuratio nregister */
#define MASK_RX_DR 6
#define MASK_TX_DS 5
#define MASK_MAX_RT 4
#define EN_CRC 3
#define CRCO 2
#define PWR_UP 1
#define PRIM_RX 0
/* enable auto acknowledgment */
#define ENAA_P5 5
#define ENAA_P4 4
#define ENAA_P3 3
#define ENAA_P2 2
#define ENAA_P1 1
#define ENAA_P0 0
/* enable rx addresses */
#define ERX_P5 5
#define ERX_P4 4
#define ERX_P3 3
#define ERX_P2 2
#define ERX_P1 1
#define ERX_P0 0
/* setup of address width */
#define AW 0 /* 2 bits */
/* setup of auto re-transmission */
#define ARD 4 /* 4 bits */
#define ARC 0 /* 4 bits */
/* RF setup register */
#define PLL_LOCK 4
#define RF_DR 3
#define RF_PWR 1 /* 2 bits */
/* general status register */
#define RX_DR 6
#define TX_DS 5
#define MAX_RT 4
#define RX_P_NO 1 /* 3 bits */
#define TX_FULL 0
/* transmit observe register */
#define PLOS_CNT 4 /* 4 bits */
#define ARC_CNT 0 /* 4 bits */
/* fifo status */
#define TX_REUSE 6
#define FIFO_FULL 5
#define TX_EMPTY 4
#define RX_FULL 1
#define RX_EMPTY 0
/* dynamic length */
#define DPL_P0 0
#define DPL_P1 1
#define DPL_P2 2
#define DPL_P3 3
#define DPL_P4 4
#define DPL_P5 5
/* Instruction Mnemonics */
#define R_REGISTER 0x00 /* last 4 bits will indicate reg. address */
#define W_REGISTER 0x20 /* last 4 bits will indicate reg. address */
#define REGISTER_MASK 0x1F
#define R_RX_PAYLOAD 0x61
#define W_TX_PAYLOAD 0xA0
#define FLUSH_TX 0xE1
#define FLUSH_RX 0xE2
#define REUSE_TX_PL 0xE3
#define ACTIVATE 0x50
#define R_RX_PL_WID 0x60
#define NOP 0xFF
/// hardware spi pin defined
#define CS_Pin RB0_bit //set port as output
#define CE_Pin RB4_bit //set port as output
#define SCK_Pin RB1_bit //set port as output
#define Mosi_Pin RB2_bit //set port as output
#define Miso_Pin RB3_bit //set port as input
#define HIGH 1
#define LOW 0
//#ifndef NRF24
#define NRF24
//#include "nRF24L01.h"
//#include <stdint.h>
#define LOW 0
#define HIGH 1
#define nrf24_ADDR_LEN 5
#define nrf24_CONFIG ((1<<EN_CRC)|(0<<CRCO))
#define NRF24_TRANSMISSON_OK 0
#define NRF24_MESSAGE_LOST 1
// spi pins defined for PIC16F628A
sbit Chip_Select at RB0_bit;
sbit SoftSpi_CLK at RB1_bit;
sbit SoftSpi_SDI at RB2_bit;
sbit SoftSpi_SDO at RB3_bit;
sbit CE_Pin_select at RB4_bit;
sbit Chip_Select_Direction at TRISB0_bit; //csn PIN
sbit SoftSpi_CLK_Direction at TRISB1_bit; //SCK
sbit SoftSpi_SDI_Direction at TRISB2_bit; //MISO
sbit SoftSpi_SDO_Direction at TRISB3_bit; //MOSI
// End DAC module connections
void nrf24_ce_digitalwrite(short int state)
{
if (state)
{
CE_Pin = 1;
}
else
{
CE_Pin = 0;
}
}
void nrf24_csn_digitalwrite(short int state)
{
if (state)
{
CS_Pin = 1;
}
else
{
CS_Pin = 0;
}
}
void nrf24_sck_digitalwrite(short int state)
{
if (state)
{
SCK_Pin = 1;
}
else
{
SCK_Pin = 0;
}
}
void nrf24_mosi_digitalwrite(short int state)
{
if (state)
{
Mosi_Pin = 1;
}
else
{
Mosi_Pin = 0;
}
}
short int nrf24_miso_digitalread()
{
return (Miso_Pin);
}
/* software spi routine */
unsigned short spi_transfer(unsigned short tx)
{
unsigned short i = 0;
short int rs = 0;
nrf24_sck_digitalWrite(LOW);
for(i=0;i<8;i++)
{
if(tx & (1<<(7-i)))
{
nrf24_mosi_digitalWrite(HIGH);
}
else
{
nrf24_mosi_digitalWrite(LOW);
}
nrf24_sck_digitalWrite(HIGH);
rs = rs << 1;
if(nrf24_miso_digitalRead())
{
rs |= 0x01;
}
nrf24_sck_digitalWrite(LOW);
}
return rs;
}
/* send and receive multiple bytes over SPI */
void nrf24_transferSync(unsigned short* dataout,unsigned short* datain,unsigned short len)
{
unsigned int i;
for(i=0;i<len;i++)
{
datain[i] = spi_transfer(dataout[i]);
}
}
//send multiple bytes over SPI
void nrf24_transmitSync(unsigned short* dataout,unsigned short len)
{
unsigned int i;
for(i=0;i<len;i++)
{
spi_transfer(dataout[i]);
}
}
//Clocks only one byte into the given nrf24 register */
void nrf24_configRegister(unsigned short reg, unsigned short value)
{
nrf24_csn_digitalWrite(LOW);
spi_transfer(W_REGISTER | (REGISTER_MASK & reg));
spi_transfer(value);
nrf24_csn_digitalWrite(HIGH);
}
/* Read single register from nrf24 */
void nrf24_readRegister(unsigned short reg, unsigned short* value, unsigned short len)
{
nrf24_csn_digitalWrite(LOW);
spi_transfer(R_REGISTER | (REGISTER_MASK & reg));
nrf24_transferSync(value,value,len);
nrf24_csn_digitalWrite(HIGH);
}
/* Write to a single register of nrf24 */
void nrf24_writeRegister(unsigned short reg, unsigned short* value, unsigned short len)
{
nrf24_csn_digitalWrite(LOW);
spi_transfer(W_REGISTER | (REGISTER_MASK & reg));
nrf24_transmitSync(value,len);
nrf24_csn_digitalWrite(HIGH);
}
unsigned short payload_len;
// init the hardware pins
void nrf24_init()
{
//nrf24_setupPins();
nrf24_ce_digitalWrite(LOW);
nrf24_csn_digitalWrite(HIGH);
}
void nrf24_powerUpRx()
{
nrf24_csn_digitalWrite(LOW);
spi_transfer(FLUSH_RX);
nrf24_csn_digitalWrite(HIGH);
nrf24_configRegister(STATUS,(1<<RX_DR)|(1<<TX_DS)|(1<<MAX_RT));
nrf24_ce_digitalWrite(LOW);
nrf24_configRegister(CONFIG,nrf24_CONFIG|((1<<PWR_UP)|(1<<PRIM_RX)));
nrf24_ce_digitalWrite(HIGH);
}
void nrf24_config(unsigned short channel, unsigned short pay_length)
{
/* Use static payload length ... */
payload_len = pay_length;
// Set RF channel
nrf24_configRegister(RF_CH,channel);
// Set length of incoming payload
nrf24_configRegister(RX_PW_P0, 0x00); // Auto-ACK pipe ...
nrf24_configRegister(RX_PW_P1, payload_len); // Data payload pipe
nrf24_configRegister(RX_PW_P2, 0x00); // Pipe not used
nrf24_configRegister(RX_PW_P3, 0x00); // Pipe not used
nrf24_configRegister(RX_PW_P4, 0x00); // Pipe not used
nrf24_configRegister(RX_PW_P5, 0x00); // Pipe not used
// 1 Mbps, TX gain: 0dbm
nrf24_configRegister(RF_SETUP, (0<<RF_DR)|((0x03)<<RF_PWR));
// CRC enable, 1 byte CRC length
nrf24_configRegister(CONFIG,nrf24_CONFIG);
// Auto Acknowledgment
nrf24_configRegister(EN_AA,(1<<ENAA_P0)|(1<<ENAA_P1)|(0<<ENAA_P2)|(0<<ENAA_P3)|(0<<ENAA_P4)|(0<<ENAA_P5));
// Enable RX addresses
nrf24_configRegister(EN_RXADDR,(1<<ERX_P0)|(1<<ERX_P1)|(0<<ERX_P2)|(0<<ERX_P3)|(0<<ERX_P4)|(0<<ERX_P5));
// Auto retransmit delay: 1000 us and Up to 15 retransmit trials
nrf24_configRegister(SETUP_RETR,(0x04<<ARD)|(0x0F<<ARC));
// Dynamic length configurations: No dynamic length
nrf24_configRegister(DYNPD,(0<<DPL_P0)|(0<<DPL_P1)|(0<<DPL_P2)|(0<<DPL_P3)|(0<<DPL_P4)|(0<<DPL_P5));
// Start listening
nrf24_powerUpRx();
}
void nrf24_powerUpTx()
{
nrf24_configRegister(STATUS,(1<<RX_DR)|(1<<TX_DS)|(1<<MAX_RT));
nrf24_configRegister(CONFIG,nrf24_CONFIG|((1<<PWR_UP)|(0<<PRIM_RX)));
}
void nrf24_powerDown()
{
nrf24_ce_digitalWrite(LOW);
nrf24_configRegister(CONFIG,nrf24_CONFIG);
}
/* Set the RX address */
void nrf24_rx_address(unsigned short * adr)
{
nrf24_ce_digitalWrite(LOW);
nrf24_writeRegister(RX_ADDR_P1,adr,nrf24_ADDR_LEN);
nrf24_ce_digitalWrite(HIGH);
}
/* Set the RX address
void nrf24_rx_address(unsigned short * adr)
{
nrf24_ce_digitalWrite(LOW);
nrf24_writeRegister(RX_ADDR_P1,adr,nrf24_ADDR_LEN);
nrf24_ce_digitalWrite(HIGH);
}
*/
/* Returns the payload length */
unsigned short nrf24_payload_length()
{
return payload_len;
}
/* Set the TX address */
void nrf24_tx_address(unsigned short* adr)
{
/* RX_ADDR_P0 must be set to the sending addr for auto ack to work. */
nrf24_writeRegister(RX_ADDR_P0,adr,nrf24_ADDR_LEN);
nrf24_writeRegister(TX_ADDR,adr,nrf24_ADDR_LEN);
}
/* Checks if receive FIFO is empty or not */
unsigned short nrf24_rxFifoEmpty()
{
unsigned short fifoStatus;
nrf24_readRegister(FIFO_STATUS,&fifoStatus,1);
return (fifoStatus & (1 << RX_EMPTY));
}
/* Checks if data is available for reading */
/* Returns 1 if data is ready ... */
unsigned short nrf24_dataReady()
{
// See note in getData() function - just checking RX_DR isn't good enough
// unsigned short status = nrf24_getStatus();
// We can short circuit on RX_DR, but if it's not set, we still need
// to check the FIFO for any pending packets
if ( status & (1 << RX_DR) )
{
return 1;
}
return !nrf24_rxFifoEmpty();;
}
/* Returns the length of data waiting in the RX fifo */
unsigned short nrf24_payloadLength()
{
unsigned short status;
nrf24_csn_digitalWrite(LOW);
spi_transfer(R_RX_PL_WID);
status = spi_transfer(0x00);
nrf24_csn_digitalWrite(HIGH);
return status;
}
/* Reads payload bytes into data array */
void nrf24_getData(unsigned int* data1)
{
/* Pull down chip select */
nrf24_csn_digitalWrite(LOW);
/* Send cmd to read rx payload */
spi_transfer( R_RX_PAYLOAD );
/* Read payload */
nrf24_transferSync(data1,data1,payload_len);
/* Pull up chip select */
nrf24_csn_digitalWrite(HIGH);
/* Reset status register */
nrf24_configRegister(STATUS,(1<<RX_DR));
}
/* Returns the number of retransmissions occured for the last message */
unsigned short nrf24_retransmissionCount()
{
unsigned short rv;
nrf24_readRegister(OBSERVE_TX,&rv,1);
rv = rv & 0x0F;
return rv;
}
// Sends a data package to the default address. Be sure to send the correct
// amount of bytes as configured as payload on the receiver.
void nrf24_send(unsigned short* value)
{
/* Go to Standby-I first */
nrf24_ce_digitalWrite(LOW);
/* Set to transmitter mode , Power up if needed */
nrf24_powerUpTx();
/* Do we really need to flush TX fifo each time ? */
// #if 1
/* Pull down chip select */
nrf24_csn_digitalWrite(LOW);
/* Write cmd to flush transmit FIFO */
spi_transfer(FLUSH_TX);
/* Pull up chip select */
nrf24_csn_digitalWrite(HIGH);
// #endif
/* Pull down chip select */
nrf24_csn_digitalWrite(LOW);
/* Write cmd to write payload */
spi_transfer(W_TX_PAYLOAD);
/* Write payload */
nrf24_transmitSync(value,payload_len);
/* Pull up chip select */
nrf24_csn_digitalWrite(HIGH);
/* Start the transmission */
nrf24_ce_digitalWrite(HIGH);
}
unsigned short nrf24_getStatus()
{
unsigned short rv;
nrf24_csn_digitalWrite(LOW);
rv = spi_transfer(NOP);
nrf24_csn_digitalWrite(HIGH);
return rv;
}
unsigned short nrf24_lastMessageStatus()
{
unsigned short rv;
rv = nrf24_getStatus();
/* Transmission went OK */
if((rv & ((1 << TX_DS))))
{
return NRF24_TRANSMISSON_OK;
}
/* Maximum retransmission count is reached */
/* Last message probably went missing ... */
else if((rv & ((1 << MAX_RT))))
{
return NRF24_MESSAGE_LOST;
}
/* Probably still sending ... */
else
{
return 0xFF;
}
}
unsigned short nrf24_isSending()
{
unsigned short status;
/* read the current status */
status = nrf24_getStatus();
/* if sending successful (TX_DS) or max retries exceded (MAX_RT). */
if((status & ((1 << TX_DS) | (1 << MAX_RT))))
{
return 0; /* false */
}
return 1; /* true */
}
void nrf24_SETUP_PINS()
{
//TRISB = 0b00001000;
//TRISA = 0b00000000;
//nothing required here as we have already defined the pins and set their direcitons.(input/output)
}
//before main initilization
unsigned int temp;
unsigned int q = 0;
unsigned int data_array[4];
unsigned int tx_address[5] = {0xE7,0xE7,0xE7,0xE7,0xE7};
unsigned int rx_address[5] = {0xE7,0xE7,0xE7,0xE7,0xE7};
int main() {
//CMCON = 0X07;
CMCON |= 7;
TRISB = 0b00001000;
TRISA = 0b00000001;
/* init hardware pins */
nrf24_init();
/* Channel #2 , payload length: 4 */
nrf24_config(2,4);
/* Set the device addresses */
nrf24_tx_address(tx_address);
nrf24_rx_address(rx_address);
while(1)
{
if(nrf24_dataReady())
{
nrf24_getData(data_array);
if (data_array[0] = 0X01) /// just putting led on if transmission is going on
PORTA.F1 = 1;
else
PORTA.F1 = 0;
}
}
}