Arduino教程——NRF24L01模块的使用

草稿，还未写完

测试可以通信，但非常不稳定，具体原因不详。
库下载：

RF24.zip(202.94 KB, 下载次数: 909)
原地址：https://github.com/maniacbug/RF24

常用函数：

	RF24 (uint8_t _cepin, uint8_t _cspin)
	构造函数
void	begin (void)
	初始化
void	startListening (void)
	开始监听指定的通道
void	stopListening (void)
	停止监听
bool	write (const void *buf, uint8_t len)
	向指定通道发送数据
bool	available (void)
	检查是否有接收到数据
bool	read (void *buf, uint8_t len)
	Read the payload.
void	openWritingPipe (uint64_t address)
	打开数据发送通道.
void	openReadingPipe (uint8_t number, uint64_t address)
	打开数据接收通道.

硬件连接方法：（图）
将NRF24L01的SPI引脚与Arduino的SPI引脚相连，模块CE和CSN引脚可以连接到Arduino任意引脚，模块的VCC需要连接到arduino的3.3V引脚上，在MOSI和CSK引脚和arduino引脚间，最好分别串联一个100欧电阻。

使用NRF24L01需要先包含以下头文件：

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#include <SPI.h> #include "nRF24L01.h" #include "RF24.h"

并建立一个radio对象

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1	RF24 radio(9,10);

两个参数分别为Arduino连接CE和CSN的引脚


发送端：

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/* */ #include <SPI.h> #include "nRF24L01.h" #include "RF24.h" RF24 radio(9,10); const uint64_t pipe = 0xE8E8F0F0E1LL; void setup(void){   Serial.begin(57600);   radio.begin();   radio.openWritingPipe(pipe);   radio.printDetails();   pinMode(2,INPUT_PULLUP); } char command[6]="hello"; void loop(void) {   uint8_t state = ! digitalRead(2);   if (digitalRead(2)==LOW){         Serial.print("Sending...");         bool ok = radio.write(command,5);         if(ok)           Serial.println("successed");         else           Serial.println("failed");       }      delay(500);  }

接收端：

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#include <SPI.h> #include "nRF24L01.h" #include "RF24.h" RF24 radio(9,10); const uint64_t pipe = 0xE8E8F0F0E1LL; void setup(void){   Serial.begin(57600);   radio.begin();   radio.openReadingPipe(1,pipe);   radio.startListening();   radio.printDetails(); } void loop(void){     char command[6];     if (radio.available()){       radio.read( command, 5 );      Serial.println(command[0]);       delay(500);     } }

通常以上程序就可以完成简单的点对点传输了，当然，RF24库还提供了其他可选配置：

void	setRetries (uint8_t delay, uint8_t count)
	Set the number and delay of retries upon failed submit.
void	setChannel (uint8_t channel)
	Set RF communication channel.
void	setPayloadSize (uint8_t size)
	Set Static Payload Size.
uint8_t	getPayloadSize (void)
	Get Static Payload Size.
uint8_t	getDynamicPayloadSize (void)
	Get Dynamic Payload Size.
void	enableAckPayload (void)
	Enable custom payloads on the acknowledge packets.
void	enableDynamicPayloads (void)
	Enable dynamically-sized payloads.
bool	isPVariant (void)
	Determine whether the hardware is an nRF24L01+ or not.
void	setAutoAck (bool enable)
	Enable or disable auto-acknowlede packets.
void	setAutoAck (uint8_t pipe, bool enable)
	Enable or disable auto-acknowlede packets on a per pipeline basis.
void	setPALevel (rf24_pa_dbm_e level)
	Set Power Amplifier (PA) level to one of four levels.
rf24_pa_dbm_e	getPALevel (void)
	Fetches the current PA level.
bool	setDataRate (rf24_datarate_e speed)
	Set the transmission data rate.
rf24_datarate_e	getDataRate (void)
	Fetches the transmission data rate.
void	setCRCLength (rf24_crclength_e length)
	Set the CRC length.
rf24_crclength_e	getCRCLength (void)
	Get the CRC length.
void	disableCRC (void)
	Disable CRC validation.

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