# -*- coding: UTF-8 -*- import time import RPi.GPIO as GPIO #一下试一下nrf24l01的C语言宏定义 TX_ADR_WIDTH = 5 # 5 uints TX address width RX_ADR_WIDTH = 5 # 5 uints RX address width TX_PLOAD_WIDTH = 32 # 20 uints TX payload RX_PLOAD_WIDTH = 32 # 20 uints TX payload TX_ADDRESS = [0x34,0x43,0x10,0x10,0x01] #本地地址 RX_ADDRESS = [0x34,0x43,0x10,0x10,0x01] #接收地址 READ_REG = 0x00 # 读寄存器指令 WRITE_REG = 0x20 # 写寄存器指令 RD_RX_PLOAD = 0x61 # 读取接收数据指令 WR_TX_PLOAD = 0xA0 # 写待发数据指令 FLUSH_TX = 0xE1 # 冲洗发送 FIFO指令 FLUSH_RX = 0xE2 # 冲洗接收 FIFO指令 REUSE_TX_PL = 0xE3 # 定义重复装载数据指令 NOP = 0xFF # 保留 #*************************************SPI(nRF24L01)寄存器地址**************************************************** CONFIG = 0x00 # 配置收发状态，CRC校验模式以及收发状态响应方式 EN_AA = 0x01 # 自动应答功能设置 EN_RXADDR = 0x02 # 可用信道设置 SETUP_AW = 0x03 # 收发地址宽度设置 SETUP_RETR = 0x04 # 自动重发功能设置 RF_CH = 0x05 # 工作频率设置 RF_SETUP = 0x06 # 发射速率、功耗功能设置 STATUS = 0x07 # 状态寄存器 OBSERVE_TX = 0x08 # 发送监测功能 CD = 0x09 # 地址检测 RX_ADDR_P0 = 0x0A # 频道0接收数据地址 RX_ADDR_P1 = 0x0B # 频道1接收数据地址 RX_ADDR_P2 = 0x0C # 频道2接收数据地址 RX_ADDR_P3 = 0x0D # 频道3接收数据地址 RX_ADDR_P4 = 0x0E # 频道4接收数据地址 RX_ADDR_P5 = 0x0F # 频道5接收数据地址 TX_ADDR = 0x10 # 发送地址寄存器 RX_PW_P0 = 0x11 # 接收频道0接收数据长度 RX_PW_P1 = 0x12 # 接收频道0接收数据长度 RX_PW_P2 = 0x13 # 接收频道0接收数据长度 RX_PW_P3 = 0x14 # 接收频道0接收数据长度 RX_PW_P4 = 0x15 # 接收频道0接收数据长度 RX_PW_P5 = 0x16 # 接收频道0接收数据长度 FIFO_STATUS = 0x17 # FIFO栈入栈出状态寄存器设置 TX_OK = 0x20 #TX发送完成中断 MAX_TX = 0x10 #达到最大发送次数中断 #sta = 0 #RX_DR = 0 #树莓派各个引脚的定义（使用BCM编码） MOSI = 5 CSN = 16 MISO = 6 SCK = 13 CE = 19 LIGHT = 12 IRQ = 17 def GPIO_Init(): GPIO.setmode(GPIO.BCM) GPIO.setwarnings(False) Pinlist = [MOSI,CSN,SCK,CE,LIGHT] GPIO.setup(Pinlist, GPIO.OUT) Pinlist_Input = [MISO,IRQ] GPIO.setup(Pinlist_Input, GPIO.IN) return 0 def LEDH(): GPIO.output(LIGHT, GPIO.HIGH) def LEDL(): GPIO.output(LIGHT, GPIO.LOW) #**************************************************************************************************** #*函数：uint SPI_RW(uint dat) #*功能：NRF24L01的SPI写时序 #**************************************************************************************************** def SPI_RW(dat): bit_ctr = 8 _MOSI = 0 while(bit_ctr): bit_ctr = bit_ctr - 1 _MOSI = dat & 0x80 #output 'dat', MSB to MOSI if(_MOSI): GPIO.output(MOSI, GPIO.HIGH) else: GPIO.output(MOSI, GPIO.LOW) dat = (dat << 1) #shift next bit into MSB.. GPIO.output(SCK, GPIO.HIGH) #Set SCK GPIO.high.. dat |= GPIO.input(MISO) #capture current MISO bit GPIO.output(SCK, GPIO.LOW) #..then set SCK GPIO.low again return dat #return read dat #**************************************************************************************************** #*函数：uchar SPI_Read(uchar reg) #*功能：NRF24L01的SPI读时序 #***************************************************************************************************** def SPI_Read(reg): reg_val = 0 GPIO.output(CSN, GPIO.LOW) #CSN GPIO.low, initialize SPI communication... SPI_RW(reg) #Select register to read from.. reg_val = SPI_RW(0) #..then read registervalue GPIO.output(CSN, GPIO.HIGH) #CSN GPIO.high, terminate SPI communication return reg_val #return register value #****************************************************************************************************# #*功能：NRF24L01读写寄存器函数 #****************************************************************************************************# def SPI_RW_Reg(reg,value): status = 0 GPIO.output(CSN, GPIO.LOW) #CSN GPIO.low, init SPI transaction status = SPI_RW(reg) #select register SPI_RW(value) #..and write value to it.. GPIO.output(CSN, GPIO.HIGH) #CSN GPIO.high again return status #return nRF24L01 status uchar #****************************************************************************************************# #*函数：uint SPI_Read_Buf(uchar reg, uchar *pBuf, uchar uchars) #*功能: 用于读数据，reg：为寄存器地址，pBuf：为待读出数据地址，uchars：读出数据的个数 #****************************************************************************************************# def SPI_Read_Buf(reg, pBuf, uchars): status = 0 uchar_ctr = 0 GPIO.output(CSN, GPIO.LOW) # Set CSN GPIO.low, init SPI tranaction status = SPI_RW(reg) # Select register to write to and read status uchar while(uchar_ctr < uchars): pBuf[uchar_ctr] = SPI_RW(0) # uchar_ctr = uchar_ctr + 1 GPIO.output(CSN, GPIO.HIGH) return(status) #return nRF24L01 status uchar #********************************************************************************************************* #*函数：uint SPI_Write_Buf(uchar reg, uchar *pBuf, uchar uchars) #*功能: 用于写数据：为寄存器地址，pBuf：为待写入数据地址，uchars：写入数据的个数 #*********************************************************************************************************# def SPI_Write_Buf(reg, pBuf, uchars): status = 0 uchar_ctr = 0 GPIO.output(CSN, GPIO.LOW) #SPI使能 status = SPI_RW(reg) while(uchar_ctr < uchars): # SPI_RW(pBuf[uchar_ctr]) uchar_ctr = uchar_ctr + 1 GPIO.output(CSN, GPIO.HIGH) #关闭SPI return(status) #****************************************************************************************************# #*函数：void SetRX_Mode(void) #*功能：数据接收配置 #****************************************************************************************************# def SetRX_Mode(): GPIO.output(CE, GPIO.LOW) SPI_RW_Reg(WRITE_REG + CONFIG, 0x0f) # IRQ收发完成中断响应，16位CRC ，主接收 GPIO.output(CE, GPIO.HIGH) #******************************************************************************************************# #*函数：unsigned char nRF24L01_RxPacket(unsigned char* rx_buf) #*功能：数据读取后放如rx_buf接收缓冲区中 #******************************************************************************************************# def nRF24L01_RxPacket(rx_buf): revale = 0 sta = 0 RX_DR = 0 sta = SPI_Read(STATUS) # 读取状态寄存其来判断数据接收状况 RX_DR = sta&0x40 if(RX_DR): # 判断是否接收到数据 GPIO.output(CE, GPIO.LOW) #SPI使能 SPI_Read_Buf(RD_RX_PLOAD,rx_buf,TX_PLOAD_WIDTH) # read receive payload from RX_FIFO buffer revale =1 #读取数据完成标志 SPI_RW_Reg(WRITE_REG+STATUS,sta) #接收到数据后RX_DR,TX_DS,MAX_PT都置高为1，通过写1来清楚中断标志 return revale #*********************************************************************************************************** #*函数：void nRF24L01_TxPacket(unsigned char * tx_buf) #*功能：发送 tx_buf中数据 #**********************************************************************************************************# def nRF24L01_TxPacket(tx_buf): sta = 0 GPIO.output(CE, GPIO.LOW) SPI_RW_Reg(WRITE_REG + CONFIG, 0x0e) GPIO.output(CE, GPIO.HIGH) time.sleep(0.00001) GPIO.output(CE, GPIO.LOW) #StandBy I模式 SPI_Write_Buf(WR_TX_PLOAD, tx_buf, TX_PLOAD_WIDTH) # 装载数据 GPIO.output(CE, GPIO.HIGH) #置高CE，激发数据发送 # while(GPIO.input(IRQ)!=0) #等待发送完成 sta=SPI_Read(STATUS) if(sta & MAX_TX): #达到最大重发次数 SPI_RW_Reg(FLUSH_TX,0xff) #清除TX FIFO寄存器 return MAX_TX if(sta&TX_OK): #发送完成 return 0 return 0xff #其他原因发送失败 #**************************************************************************************** #*NRF24L01初始化 #***************************************************************************************# def Init_NRF24L01(): GPIO.output(CE, GPIO.LOW) # chip enable GPIO.output(CSN, GPIO.HIGH) # Spi disable GPIO.output(SCK, GPIO.LOW) # Spi clock line init GPIO.high SPI_Write_Buf(WRITE_REG + TX_ADDR, TX_ADDRESS, TX_ADR_WIDTH) # 写本地地址 SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, RX_ADDRESS, RX_ADR_WIDTH) # 写接收端地址 SPI_RW_Reg(WRITE_REG + EN_AA, 0x01) # 频道0自动 ACK应答允许 SPI_RW_Reg(WRITE_REG + EN_RXADDR, 0x01) # 允许接收地址只有频道0，如果需要多频道可以参考Page21 SPI_RW_Reg(WRITE_REG + RF_CH, 40) # 设置信道工作为2.4GHZ，收发必须一致 SPI_RW_Reg(WRITE_REG + RX_PW_P0, RX_PLOAD_WIDTH) #设置接收数据长度，本次设置为32字节 SPI_RW_Reg(WRITE_REG + RF_SETUP, 0x0f) #设置发射速率为1MHZ，发射功率为最大值0dB return 0 if __name__ == "__main__": TxBuf = [1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0] RxBuf = [0,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0] GPIO_Init() Init_NRF24L01() SetRX_Mode() while True: if nRF24L01_RxPacket(RxBuf): if RxBuf[0]: print(RxBuf) LEDH() SetRX_Mode() time.sleep(0.1) LEDL() time.sleep(0.1)