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51测试源程序如下：
#include <reg51.h>
//<nRF2401_Pins 对应引脚>
sbit MISO =P1^3;
sbit MOSI =P1^4;
sbit SCK =P1^5;
sbit CE =P1^6;
sbit CSN =P3^7;
sbit IRQ =P1^2;
sbit LED2 =P3^5;
sbit LED1 =P3^4;
sbit KEY1 =P3^0;
sbit KEY2 =P3^1;
// SPI(nRF24L01) commands
#define READ_REG 0x00 // Define read command to register
#define WRITE_REG 0x20 // Define write command to register
#define RD_RX_PLOAD 0x61 // Define RX payload register address
#define WR_TX_PLOAD 0xA0 // Define TX payload register address
#define FLUSH_TX 0xE1 // Define flush TX register command
#define FLUSH_RX 0xE2 // Define flush RX register command
#define REUSE_TX_PL 0xE3 // Define reuse TX payload register command
#define NOP 0xFF // Define No Operation, might be used to read status register
//***************************************************//
// SPI(nRF24L01) registers(addresses)
#define CONFIG 0x00 // 'Config' register address
#define EN_AA 0x01 // 'Enable Auto Acknowledgment' register address
#define EN_RXADDR 0x02 // 'Enabled RX addresses' register address
#define SETUP_AW 0x03 // 'Setup address width' register address
#define SETUP_RETR 0x04 // 'Setup Auto. Retrans' register address
#define RF_CH 0x05 // 'RF channel' register address
admin 发表于 2008-7-21 14:08
#define RF_SETUP 0x06 // 'RF setup' register address
#define STATUS 0x07 // 'Status' register address
#define OBSERVE_TX 0x08 // 'Observe TX' register address
#define CD 0x09 // 'Carrier Detect' register address
#define RX_ADDR_P0 0x0A // 'RX address pipe0' register address
#define RX_ADDR_P1 0x0B // 'RX address pipe1' register address
#define RX_ADDR_P2 0x0C // 'RX address pipe2' register address
#define RX_ADDR_P3 0x0D // 'RX address pipe3' register address
#define RX_ADDR_P4 0x0E // 'RX address pipe4' register address
#define RX_ADDR_P5 0x0F // 'RX address pipe5' register address
#define TX_ADDR 0x10 // 'TX address' register address
#define RX_PW_P0 0x11 // 'RX payload width, pipe0' register address
#define RX_PW_P1 0x12 // 'RX payload width, pipe1' register address
#define RX_PW_P2 0x13 // 'RX payload width, pipe2' register address
#define RX_PW_P3 0x14 // 'RX payload width, pipe3' register address
#define RX_PW_P4 0x15 // 'RX payload width, pipe4' register address
#define RX_PW_P5 0x16 // 'RX payload width, pipe5' register address
#define FIFO_STATUS 0x17 // 'FIFO Status Register' register address //------------------------------------------------------------
// 写一个字节到24L01，同时读出一个字节
uchar SPI_RW(uchar byte)
{
uchar bit_ctr;
for(bit_ctr=0;bit_ctr<8;bit_ctr++) // output 8-bit
{
MOSI = (byte & 0x80); // output 'byte', MSB to MOSI
byte = (byte << 1); // shift next bit into MSB..
SCK = 1; // Set SCK high..
byte |= MISO; // capture current MISO bit
SCK = 0; // ..then set SCK low again
}
return(byte); // return read byte
}
// 向寄存器reg写一个字节，同时返回状态字节
uchar SPI_RW_Reg(BYTE reg, BYTE value)
{
uchar status;
CSN = 0; // CSN low, init SPI transaction
status = SPI_RW(reg); // select register
admin 发表于 2008-7-21 14:09
SPI_RW(value); // ..and write value to it..
CSN = 1; // CSN high again
return(status); // return nRF24L01 status byte
}
// 读出bytes字节的数据
uchar SPI_Read_Buf(BYTE reg, BYTE *pBuf, BYTE bytes)
{
uchar status,byte_ctr;
CSN = 0; // Set CSN low, init SPI tranaction
status = SPI_RW(reg); // Select register to write to and read status byte
for(byte_ctr=0;byte_ctr<bytes;byte_ctr++)
pBuf[byte_ctr] = SPI_RW(0); //
CSN = 1;
return(status); // return nRF24L01 status byte
}
// 写入bytes字节的数据
uchar SPI_Write_Buf(BYTE reg, BYTE *pBuf, BYTE bytes)
{
uchar status,byte_ctr;
CSN = 0;
status = SPI_RW(reg);
for(byte_ctr=0; byte_ctr<bytes; byte_ctr++) //
SPI_RW(*pBuf++);
CSN = 1; // Set CSN high again
return(status); //
}
// 接收函数，返回1表示有数据收到，否则没有数据接受到
unsigned char nRF24L01_RxPacket(unsigned char* rx_buf)
{
unsigned char revale=0;
// set in RX mode
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0f); // Set PWR_UP bit, enable CRC(2 bytes) & Prim:RX. RX_DR enabled..
admin 发表于 2008-7-21 14:09
CE = 1; // Set CE pin high to enable RX device
dalay130us();
sta=SPI_Read(STATUS); // read register STATUS's value
if(RX_DR) // if receive data ready (RX_DR) interrupt
{
CE = 0; // stand by mode
SPI_Read_Buf(RD_RX_PLOAD,rx_buf,TX_PLOAD_WIDTH);// read receive payload from RX_FIFO buffer
revale =1;
}
SPI_RW_Reg(WRITE_REG+STATUS,sta);// clear RX_DR or TX_DS or MAX_RT interrupt flag
return revale;
}
// 发送函数
void nRF24L01_TxPacket(unsigned char * tx_buf)
{
CE=0;
//SPI_Write_Buf(WRITE_REG + TX_ADDR, TX_ADDRESS, TX_ADR_WIDTH); // Writes TX_Address to nRF24L01
//SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, TX_ADDRESS, TX_ADR_WIDTH); // RX_Addr0 same as TX_Adr for Auto.Ack
SPI_Write_Buf(WR_TX_PLOAD, tx_buf, TX_PLOAD_WIDTH); // Writes data to TX payload
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0e); // Set PWR_UP bit, enable CRC(2 bytes) & Prim:TX. MAX_RT & TX_DS enabled..
CE=1;
dalay10us();
CE=0;
}
// 配置函数
void nRF24L01_Config(void)
{
//initial io
CE=0; // chip enable
CSN=1; // Spi disable
SCK=0; // Spi clock line init high
admin 发表于 2008-7-21 14:09
CE=0;
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0f); // Set PWR_UP bit, enable CRC(2 bytes) & Prim:RX. RX_DR enabled..
SPI_RW_Reg(WRITE_REG + EN_AA, 0x01);
SPI_RW_Reg(WRITE_REG + EN_RXADDR, 0x01); // Enable Pipe0
SPI_RW_Reg(WRITE_REG + SETUP_AW, 0x02); // Setup address width=5 bytes
SPI_RW_Reg(WRITE_REG + SETUP_RETR, 0x1a); // 500us + 86us, 10 retrans...
SPI_RW_Reg(WRITE_REG + RF_CH, 0);
SPI_RW_Reg(WRITE_REG + RF_SETUP, 0x07); // TX_PWR:0dBm, Datarate:1Mbps, LNA:HCURR
SPI_RW_Reg(WRITE_REG + RX_PW_P0, RX_PLOAD_WIDTH); SPI_Write_Buf(WRITE_REG + TX_ADDR, TX_ADDRESS, TX_ADR_WIDTH); SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, TX_ADDRESS, TX_ADR_WIDTH); CE=1; //
}
射频板特性如下：
(1) 2.4Ghz 全球开放ISM 频段免许可证使用
(2) 最高工作速率2Mbps，高效GFSK调制，抗干扰能力强，特别适合工业控制场合
(3) 125 频道，满足多点通信和跳频通信需要
(4) 内置硬件CRC 检错和点对多点通信地址控制
(5) 低功耗1.9～3.6V 工作，Power down 模式下状态仅为1uA
(6) 内置2.4Ghz 天线，体积小巧约18*37mm
(7) 模块可软件设地址，只有收到本机地址时才会输出数据（提供中断指示)，可直接接各种单片机使用，软件编程非常方便
(8) 内置专门稳压电路，使用各种电源包括DC/DC 开关电源均有很好的通信效果
(9) 标准DIP间距接口，便于嵌入式应用
性能参数
(1) 开阔地无干扰视距100米!!!
(2) 尺寸: 34mm X 17mm X 1mm
(3) 可以传输音频、视频
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