nrf24_test_receive.c File Reference

Test program for receiving data with a Nordic NRF24L01p and a Xmega. More...

#include <avr/io.h>
#include <avr/interrupt.h>
#include "nrf24/nrf24spiXM2.h"
#include "nrf24/nrf24L01.h"

Macros
#define	F_CPU   2000000UL

Functions
void	init_pwm (void)
	Initializes pin 0 of port C as PWM ouput. More...
void	init_nrf (void)
	Initializes nrf24L01+. More...
int	main (void)
	main routine for receiver More...
	ISR (PORTF_INT0_vect)
	Interrupt function for receiving data. More...

Variables
uint8_t	pipe [5] = {0x48, 0x76, 0x41, 0x30, 0x31}
	pipe address is "HvA01" More...
uint8_t	packet [32]
	buffer for storing received data More...

Detailed Description

Test program for receiving data with a Nordic NRF24L01p and a Xmega.

Author

Wim Dolman (w.e.dolman@hva.nl)

Date

30-06-2016

Version

1.0

The hardware configuration consists of a sender and a receiver. This file contains the program for the receiver. The sender is in file nrf24_test_send.c. The receiver is just a HvA-Xmegaboard with nothing connected. The led is the blue led.

The receiver gets two bytes from the sender. The first byte received is the least significant byte and the second byte is the most significant byte. This 16-bits value is used to change the duty-cycle of the PWM-signaal

Note

Usage with Atmel Studio:

1. • place this file in the Atmel Studio project folder
   • add this file to the project
2. • place the library files nrf24L01.c, nrf24L01.h, nrf24spiXM2.c and nrf24spiXM2.h in a folder nrf24 in the project folder
   • add these files to the project as link

You place the library fiels also directly in the project folder or in an other folder. In that case you need to change the path in the #include lines.

This test program is based on the example in paragraph E.1 from 'De taal C en de Xmega'

Macro Definition Documentation

#define F_CPU   2000000UL

Function Documentation

void init_nrf

(

void

)

Initializes nrf24L01+.

This function is almost the same as the init_nrf() of the sender. The interrupt is enabled. The interrupt pin is pin 6 of port F and responses to a falling edge.

Only a pipe for reading opened and the radiomodule is set in the receive mode.

This routine is code E.3 from 'De taal C en de Xmega' second edition, see Voorbeelden uit 'De taal C en de Xmega'

Returns

void

This function is almost the same as the init_nrf() of the receiver. There are two pipes. One for sending the value and one for the acknowledge

This routine is code E.1 from 'De taal C en de Xmega' second edition, see Voorbeelden uit 'De taal C en de Xmega'

Returns

void

void init_pwm

(

void

)

Initializes pin 0 of port C as PWM ouput.

With F_CPU is 2 MHz the frequency will be 200 Hz

This routine is code E.5 from 'De taal C en de Xmega' second edition, see Voorbeelden uit 'De taal C en de Xmega'

Returns

void

ISR

(

PORTF_INT0_vect

)

Interrupt function for receiving data.

If the interrupt is caused by the received data a data packet is read and assigned to CCABUF of timer/counter0 of port C.

This routine is code E.6 from 'De taal C en de Xmega' second edition, see Voorbeelden uit 'De taal C en de Xmega'

Returns

void

int main

(

void

)

main routine for receiver

It initializes the nrf24L01+ and the pwm output and enables the interrupt mechanism. It does nothing. The program just waits for an interrupt of the nrf24L01+.

This routine is code E.4 from 'De taal C en de Xmega' second edition, see Voorbeelden uit 'De taal C en de Xmega'

Returns

int

Variable Documentation

uint8_t packet[32]

buffer for storing received data

uint8_t pipe[5] = {0x48, 0x76, 0x41, 0x30, 0x31}

pipe address is "HvA01"