nrf24spiXM2.c File Reference

Spi driver for Nordic NRF24L01p on HvA Xmegaboard-version2. More...

#include "nrf24spiXM2.h"

Functions
void	nrfspiInit (void)
	Initialization of SPI. More...
uint8_t	nrfspiTransfer (uint8_t iData)
	SPI transfer. More...

Detailed Description

Spi driver for Nordic NRF24L01p on HvA Xmegaboard-version2.

Author

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

Date

18-02-2016

Version

1.0

This file contains the routines for interfacing a Nordic NRF24L01p on HvA Xmegaboard-version2 from july 2015.

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

The interface exists of six signals:

• Nordic NRF24L01p | Xmegaboard-version2
• 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

Function Documentation

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)