You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
233 lines
11 KiB
233 lines
11 KiB
# -*- 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)
|
|
|