nRF24L01 Module for Arduino
Posted: Wed Jan 29, 2014 11:20 am
- 1.jpg (5.39 KiB) Viewed 40937 times
The Demo pins to Arduino as below:
GND – GND, VCC – 3.3V, CS – D8, CSN – D9, SCK – D10, MOSI – D11, MISO – D12, IRQ – D13
Download the code below into the TX Arduino (transmit) — This code will drive the nRF24L01 module to send out data form 0×00 to 0xFF .
Note, between the write TX_FIFO and clear RX_DR or TX_DS or MAX_RT interrupt flag, would better not serial print anything, which maybe case ACK failed.
Code: Select all
void setup()
{
SPI_DIR = ( CE + SCK + CSN + MOSI);
SPI_DIR &=~ ( IRQ + MISO);
// attachInterrupt(1, _ISR, LOW);// interrupt enable
Serial.begin(9600);
init_io(); // Initialize IO port
unsigned char status=SPI_Read(STATUS);
Serial.print("status = ");
Serial.println(status,HEX); // read the mode’s status register, the default value should be ‘E’
Serial.println("*******************TX_Mode Start****************************");
TX_Mode(); // set TX mode
}
void loop()
{
int k = 0;
for(;;)
{
for(int i=0; i<32; i++)
tx_buf[i] = k++;
unsigned char status = SPI_Read(STATUS); // read register STATUS's value
if(status&TX_DS) // if receive data ready (TX_DS) interrupt
{
SPI_RW_Reg(FLUSH_TX,0);
SPI_Write_Buf(WR_TX_PLOAD,tx_buf,TX_PLOAD_WIDTH); // write playload to TX_FIFO
}
if(status&MAX_RT) // this is retransmit than SETUP_RETR
{
SPI_RW_Reg(FLUSH_TX,0);
SPI_Write_Buf(WR_TX_PLOAD,tx_buf,TX_PLOAD_WIDTH); // disable standy-mode
}
SPI_RW_Reg(WRITE_REG+STATUS,status); // clear RX_DR or TX_DS or MAX_RT interrupt flag
delay(1000);
}
}
Download the code below into the RX Arduino (receive) – This code will drive the nFR24L01 module to receive the data that transmit form the TX module and print it to serial port.
Note, clear RX_FIFO must bellow Read_FIFO
Code: Select all
void setup()
{
SPI_DIR = ( CE + SCK + CSN + MOSI);
SPI_DIR &=~ ( IRQ + MISO);
// attachInterrupt(1, _ISR, LOW); // interrupt enable
Serial.begin(9600);
init_io(); // Initialize IO port
unsigned char status=SPI_Read(STATUS);
Serial.print("status = ");
Serial.println(status,HEX); // read the mode’s status register, the default value should be ‘E’
Serial.println("*****************RX_Mode start******************************R");
RX_Mode(); // set RX mode
}
void loop()
{
for(;;)
{
unsigned char status = SPI_Read(STATUS); // read register STATUS's value
if(status&RX_DR) // if receive data ready (TX_DS) interrupt
{
SPI_Read_Buf(RD_RX_PLOAD, rx_buf, TX_PLOAD_WIDTH); // read playload to rx_buf
SPI_RW_Reg(FLUSH_RX,0); // clear RX_FIFO
for(int i=0; i<32; i++)
{
Serial.print(" ");
Serial.print(rx_buf[i],HEX); // print rx_buf
}
Serial.println(" ");
}
SPI_RW_Reg(WRITE_REG+STATUS,status); // clear RX_DR/TX_DS/MAX_RT interrupt flag
delay(1000);
}
}
Now power on both Arduino , and connect the RX one to PC via USB. Open the IDE serial port monitor , change the baud rate to 9600 bps , and you can see the data that received.
If you want to change Arduino pin connecting to module , just modify the define on the NRF24L01.h .
All the project here(include API.h and NRF24L01.h)
- 2.jpg (125.63 KiB) Viewed 40937 times
nRF24L01_Demo_For_Arduino.zip- (7.61 KiB) Downloaded 1162 times
- nRF24L01_Demo_For_Arduino_v1.1.zip
- (7.37 KiB) Downloaded 1190 times
nRF24L01 with Arduinio’s SPI Library
Article courtesy of elecfreaks.com