nrf24spiXM2.h File Reference

Header file SPI driver for Nordic NRF24L01p on Xmegaboard-version2. More...

#include <avr/io.h>
#include <util/delay.h>

Go to the source code of this file.

Macros
#define	F_CPU   32000000UL
#define	NRF_SELECT   0
	Spi slave selected. More...
#define	NRF_DESELECT   1
	Spi slave deselected. More...
#define	NRF_ENABLE   1
	NRF chip enable. More...
#define	NRF_DISABLE   0
	NRF chip disable. More...

Functions
void	nrfspiInit (void)
	Initialization of SPI. More...
uint8_t	nrfspiTransfer (uint8_t iData)
	SPI transfer. More...
void	nrfCSn (uint8_t bSelected)
	Set chip select. More...
void	nrfCE (uint8_t bEnabled)
	Set chip enable. More...

Detailed Description

Header file SPI driver for Nordic NRF24L01p on Xmegaboard-version2.

Author

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

Date

18-02-2016

Version

1.0

This file contains the definitions and prototypes for interfacing a Nordic NRF24L01p on Xmegaboard-version2 from july 2015.

This driver uses UARTC0 as SPI-interface. The baudrate is the maximum rate. This is 8 MHz @ Fcpu 32MHz. It doesn't exceed the maximum speed 10 MHz of the NRF24L01p.

The interface exists of six signals:

Nordic NRF24L01p		Xmegaboard-V2
IRQ	interrupt request	PF6
CE	chip enable	PF7
CSN	SPI slave select	PF5
SCK	SPI clock	PC1
MOSI	SPI MOSI	PC3
MISO	SPI MOSI	PC2

More information can be found in chapter 8 of the NRF24L01p datasheet.

Macro Definition Documentation

#define F_CPU   32000000UL

#define NRF_DESELECT   1

Spi slave deselected.

#define NRF_DISABLE   0

NRF chip disable.

#define NRF_ENABLE   1

NRF chip enable.

#define NRF_SELECT   0

Spi slave selected.

Function Documentation

void nrfCE ( uint8_t  bEnabled )

inline

Set chip enable.

Parameters

bEnabled

NRF_ENABLE enables transmission of Nordic chip NRF_DISABLE disables transmission of Nordic chip

Level NRF_ENABLE (high) starts transmission and NRF_ENABLE (low) puts Nordic LOW in standby.

Returns

void

void nrfCSn ( uint8_t  bSelected )

inline

Set chip select.

Parameters

bSelected

NRF_SELECT selects SPI bus, NRF_DESELECT deselect SPI bus

Returns

void

void nrfspiInit

(

void

)

Initialization of SPI.

This routines has no parameters. It Initializes UARTC0 as SPI and the signals IRQ and CE

Returns

void

uint8_t nrfspiTransfer

(

uint8_t

iData

)

SPI transfer.

Parameters

iData

data byte send to the slave

This function send a byte IData to register to the slave, while data from the slave is received into the DATA register.

In this case, for the nrf24L01p, the value of status-register is shifted out

Returns

Data received from slave (status of the nrf24L01p)