1
RF/无线
#include 《reg51.h》
#define uchar unsigned char
#define uint unsigned int
sbit CE = P1^0; // Chip Enable pin signal (output)
sbit CSN = P1^1; // Slave Select pin, (output to CSN, nRF24L01)
sbit IRQ = P1^5; // Interrupt signal, from nRF24L01 (input)
sbit MISO = P1^4; // Master In, Slave Out pin (input)
sbit MOSI = P1^3; // Serial Clock pin, (output)
sbit SCK = P1^2; // Master Out, Slave In pin (output)
// 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
#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
#define TX_ADR_WIDTH 5 // 5字节宽度的发送/接收地址
#define TX_PLOAD_WIDTH 4 // 数据通道有效数据宽度
uchar code TX_ADDRESS[TX_ADR_WIDTH] = {0x34,0x43,0x10,0x10,0x01}; // 定义一个静态发送地址
uchar RX_BUF[TX_PLOAD_WIDTH];
uchar TX_BUF[TX_PLOAD_WIDTH];
uchar flag;
uchar DATA = 0x01;
uchar bdata sta;
sbit RX_DR = sta^6;
sbit TX_DS = sta^5;
sbit MAX_RT = sta^4;
void init_io(void)
{
CE = 0; // 待机
CSN = 1; // SPI禁止
SCK = 0; // SPI时钟置低
IRQ = 1; // 中断复位
}
void delay_ms(uchar x)
{
uchar i, j;
i = 0;
for(i=0; i《x; i++)
{
j = 250;
while(--j);
j = 250;
while(--j);
}
}
uchar SPI_RW(uchar byte)
{
uchar i;
for(i=0; i《8; i++) // 循环8次
{
MOSI = (byte & 0x80); // byte最高位输出到MOSI
byte 《《= 1; // 低一位移位到最高位
SCK = 1; // 拉高SCK,nRF24L01从MOSI读入1位数据,同时从MISO输出1位数据
byte |= MISO; // 读MISO到byte最低位
SCK = 0; // SCK置低
}
return(byte); // 返回读出的一字节
}
uchar SPI_RW_Reg(uchar reg, uchar value)
{
uchar status;
CSN = 0; // CSN置低,开始传输数据
status = SPI_RW(reg); // 选择寄存器,同时返回状态字
SPI_RW(value); // 然后写数据到该寄存器
CSN = 1; // CSN拉高,结束数据传输
return(status); // 返回状态寄存器
}
uchar SPI_Read(uchar reg)
{
uchar reg_val;
CSN = 0; // CSN置低,开始传输数据
SPI_RW(reg); // 选择寄存器
reg_val = SPI_RW(0); // 然后从该寄存器读数据
CSN = 1; // CSN拉高,结束数据传输
return(reg_val); // 返回寄存器数据
}
uchar SPI_Read_Buf(uchar reg, uchar * pBuf, uchar bytes)
{
uchar status, i;
CSN = 0; // CSN置低,开始传输数据
status = SPI_RW(reg); // 选择寄存器,同时返回状态字
for(i=0; i《bytes; i++)
pBuf = SPI_RW(0); // 逐个字节从nRF24L01读出
CSN = 1; // CSN拉高,结束数据传输
return(status); // 返回状态寄存器
}
uchar SPI_Write_Buf(uchar reg, uchar * pBuf, uchar bytes)
{
uchar status, i;
CSN = 0; // CSN置低,开始传输数据
status = SPI_RW(reg); // 选择寄存器,同时返回状态字
for(i=0; i《bytes; i++)
SPI_RW(pBuf); // 逐个字节写入nRF24L01
CSN = 1; // CSN拉高,结束数据传输
return(status); // 返回状态寄存器
}
void RX_Mode(void)
{
CE = 0;
SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, TX_ADDRESS, TX_ADR_WIDTH); // 接收设备接收通道0使用和发送设备相同的发送地址
SPI_RW_Reg(WRITE_REG + EN_AA, 0x01); // 使能接收通道0自动应答
SPI_RW_Reg(WRITE_REG + EN_RXADDR, 0x01); // 使能接收通道0
SPI_RW_Reg(WRITE_REG + RF_CH, 40); // 选择射频通道0x40
SPI_RW_Reg(WRITE_REG + RX_PW_P0, TX_PLOAD_WIDTH); // 接收通道0选择和发送通道相同有效数据宽度
SPI_RW_Reg(WRITE_REG + RF_SETUP, 0x07); // 数据传输率1Mbps,发射功率0dBm,低噪声放大器增益
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0f); // CRC使能,16位CRC校验,上电,接收模式
CE = 1; // 拉高CE启动接收设备
}
void TX_Mode(uchar * BUF)
{
CE = 0;
SPI_Write_Buf(WRITE_REG + TX_ADDR, TX_ADDRESS, TX_ADR_WIDTH); // 写入发送地址
SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, TX_ADDRESS, TX_ADR_WIDTH); // 为了应答接收设备,接收通道0地址和发送地址相同
SPI_Write_Buf(WR_TX_PLOAD, BUF, TX_PLOAD_WIDTH); // 写数据包到TX FIFO
SPI_RW_Reg(WRITE_REG + EN_AA, 0x01); // 使能接收通道0自动应答
SPI_RW_Reg(WRITE_REG + EN_RXADDR, 0x01); // 使能接收通道0
SPI_RW_Reg(WRITE_REG + SETUP_RETR, 0x0a); // 自动重发延时等待250us+86us,自动重发10次
SPI_RW_Reg(WRITE_REG + RF_CH, 40); // 选择射频通道0x40
SPI_RW_Reg(WRITE_REG + RF_SETUP, 0x07); // 数据传输率1Mbps,发射功率0dBm,低噪声放大器增益
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0e); // CRC使能,16位CRC校验,上电
CE = 1;
}
uchar Check_ACK(bit clear)
{
while(IRQ);
sta = SPI_RW(NOP); // 返回状态寄存器
if(MAX_RT)
if(clear) // 是否清除TX FIFO,没有清除在复位MAX_RT中断标志后重发
SPI_RW(FLUSH_TX);
SPI_RW_Reg(WRITE_REG + STATUS, sta); // 清除TX_DS或MAX_RT中断标志
IRQ = 1;
if(TX_DS)
return(0x00);
else
return(0xff);
}
unsigned char nRF24L01_RxPacket(unsigned char* RX_BUF)
{
unsigned char revale=0;
//SetRX_Mode();
sta=SPI_Read(STATUS); // read register STATUS‘s value
if(RX_DR) // if receive data ready (RX_DR) interrupt
{
CE = 0;
SPI_Read_Buf(RD_RX_PLOAD,RX_BUF,TX_PLOAD_WIDTH);// read receive payload from RX_FIFO buffer
revale =1;//we have receive data
}
SPI_RW_Reg(WRITE_REG+STATUS,sta);// clear RX_DR or TX_DS or MAX_RT interrupt flag
return revale;
}
void main(void)
{
uchar a[5]={0xfe,0xfd,0xfc,0xf0,0x1d};
uchar i;
init_io(); // 初始化IO
// RX_Mode(); // 设置为接收模式
while(1)
{
for(i=0;i《5;i++)
{
TX_BUF = a; // 数据送到缓存
TX_Mode(TX_BUF); // 把nRF24L01设置为发送模式并发送数据
Check_ACK(1); // 等待发送完毕,清除TX FIFO
delay_ms(250);
delay_ms(250);
// RX_Mode();
}
}
}
#include 《reg51.h》
#define uchar unsigned char
#define uint unsigned int
sbit CE = P0^0; // Chip Enable pin signal (output)
sbit CSN = P0^1; // Slave Select pin, (output to CSN, nRF24L01)
sbit IRQ = P0^5; // Interrupt signal, from nRF24L01 (input)
sbit MISO = P0^4; // Master In, Slave Out pin (input)
sbit MOSI = P0^3; // Serial Clock pin, (output)
sbit SCK = P0^2; // Master Out, Slave In pin (output)
// 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
#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
#define TX_ADR_WIDTH 5 // 5字节宽度的发送/接收地址
#define TX_PLOAD_WIDTH 4 // 数据通道有效数据宽度 因为这个4,导致发送接收的数据缺少第五个!改成5则正常!
#define LED P1
uchar code TX_ADDRESS[TX_ADR_WIDTH] = {0x34,0x43,0x10,0x10,0x01}; // 定义一个静态发送地址
uchar RX_BUF[TX_PLOAD_WIDTH];
uchar TX_BUF[TX_PLOAD_WIDTH];
uchar flag;
uchar DATA = 0x01;
uchar bdata sta;
sbit RX_DR = sta^6;
sbit TX_DS = sta^5;
sbit MAX_RT = sta^4;
void init_io(void)
{
CE = 0; // 待机
CSN = 1; // SPI禁止
SCK = 0; // SPI时钟置低
IRQ = 1; // 中断复位
LED = 0xff; // 关闭指示灯
}
void delay_ms(uchar x)
{
uchar i, j;
i = 0;
for(i=0; i《x; i++)
{
j = 250;
while(--j);
j = 250;
while(--j);
}
}
uchar SPI_RW(uchar byte)
{
uchar i;
for(i=0; i《8; i++) // 循环8次
{
MOSI = (byte & 0x80); // byte最高位输出到MOSI
byte 《《= 1; // 低一位移位到最高位
SCK = 1; // 拉高SCK,nRF24L01从MOSI读入1位数据,同时从MISO输出1位数据
byte |= MISO; // 读MISO到byte最低位
SCK = 0; // SCK置低
}
return(byte); // 返回读出的一字节
}
uchar SPI_RW_Reg(uchar reg, uchar value)
{
uchar status;
CSN = 0; // CSN置低,开始传输数据
status = SPI_RW(reg); // 选择寄存器,同时返回状态字
SPI_RW(value); // 然后写数据到该寄存器
CSN = 1; // CSN拉高,结束数据传输
return(status); // 返回状态寄存器
}
uchar SPI_Read(uchar reg)
{
uchar reg_val;
CSN = 0; // CSN置低,开始传输数据
SPI_RW(reg); // 选择寄存器
reg_val = SPI_RW(0); // 然后从该寄存器读数据
CSN = 1; // CSN拉高,结束数据传输
return(reg_val); // 返回寄存器数据
}
uchar SPI_Read_Buf(uchar reg, uchar * pBuf, uchar bytes)
{
uchar status, i;
CSN = 0; // CSN置低,开始传输数据
status = SPI_RW(reg); // 选择寄存器,同时返回状态字
for(i=0; i《bytes; i++)
pBuf = SPI_RW(0); // 逐个字节从nRF24L01读出
CSN = 1; // CSN拉高,结束数据传输
return(status); // 返回状态寄存器
}
uchar SPI_Write_Buf(uchar reg, uchar * pBuf, uchar bytes)
{
uchar status, i;
CSN = 0; // CSN置低,开始传输数据
status = SPI_RW(reg); // 选择寄存器,同时返回状态字
for(i=0; i《bytes; i++)
SPI_RW(pBuf); // 逐个字节写入nRF24L01
CSN = 1; // CSN拉高,结束数据传输
return(status); // 返回状态寄存器
}
void RX_Mode(void)
{
CE = 0;
SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, TX_ADDRESS, TX_ADR_WIDTH); // 接收设备接收通道0使用和发送设备相同的发送地址
SPI_RW_Reg(WRITE_REG + EN_AA, 0x01); // 使能接收通道0自动应答
SPI_RW_Reg(WRITE_REG + EN_RXADDR, 0x01); // 使能接收通道0
SPI_RW_Reg(WRITE_REG + RF_CH, 40); // 选择射频通道0x40
SPI_RW_Reg(WRITE_REG + RX_PW_P0, TX_PLOAD_WIDTH); // 接收通道0选择和发送通道相同有效数据宽度
SPI_RW_Reg(WRITE_REG + RF_SETUP, 0x07); // 数据传输率1Mbps,发射功率0dBm,低噪声放大器增益
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0f); // CRC使能,16位CRC校验,上电,接收模式
CE = 1; // 拉高CE启动接收设备
}
void TX_Mode(uchar * BUF)
{
CE = 0;
SPI_Write_Buf(WRITE_REG + TX_ADDR, TX_ADDRESS, TX_ADR_WIDTH); // 写入发送地址
SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, TX_ADDRESS, TX_ADR_WIDTH); // 为了应答接收设备,接收通道0地址和发送地址相同
SPI_Write_Buf(WR_TX_PLOAD, BUF, TX_PLOAD_WIDTH); // 写数据包到TX FIFO
SPI_RW_Reg(WRITE_REG + EN_AA, 0x01); // 使能接收通道0自动应答
SPI_RW_Reg(WRITE_REG + EN_RXADDR, 0x01); // 使能接收通道0
SPI_RW_Reg(WRITE_REG + SETUP_RETR, 0x0a); // 自动重发延时等待250us+86us,自动重发10次
SPI_RW_Reg(WRITE_REG + RF_CH, 40); // 选择射频通道0x40
SPI_RW_Reg(WRITE_REG + RF_SETUP, 0x07); // 数据传输率1Mbps,发射功率0dBm,低噪声放大器增益
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0e); // CRC使能,16位CRC校验,上电
CE = 1;
}
uchar Check_ACK(bit clear)
{
while(IRQ);
sta = SPI_RW(NOP); // 返回状态寄存器
if(MAX_RT)
if(clear) // 是否清除TX FIFO,没有清除在复位MAX_RT中断标志后重发
SPI_RW(FLUSH_TX);
SPI_RW_Reg(WRITE_REG + STATUS, sta); // 清除TX_DS或MAX_RT中断标志
IRQ = 1;
if(TX_DS)
return(0x00);
else
return(0xff);
}
unsigned char nRF24L01_RxPacket(unsigned char* RX_BUF)
{
unsigned char revale=0;
//SetRX_Mode();
sta=SPI_Read(STATUS); // read register STATUS‘s value
if(RX_DR) // if receive data ready (RX_DR) interrupt
{
CE = 0;
SPI_Read_Buf(RD_RX_PLOAD,RX_BUF,TX_PLOAD_WIDTH);// read receive payload from RX_FIFO buffer
revale =1;//we have receive data
}
SPI_RW_Reg(WRITE_REG+STATUS,sta);// clear RX_DR or TX_DS or MAX_RT interrupt flag
return revale;
}
void main(void)
{
uchar i;
uchar reveal;
init_io(); // 初始化IO
RX_Mode(); // 设置为接收模式
while(1)
{
reveal=nRF24L01_RxPacket(RX_BUF);
if(reveal==1) // 接受完成
{
reveal = 0;
for(i=0;i《5;i++)
{
LED = RX_BUF;
delay_ms(250);
delay_ms(250);
}
}
}
}
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