NRF24L01動態(tài)字節(jié)長度接受和發(fā)送

1、在STM32戰(zhàn)艦開發(fā)板上測試，接受采用IRQ引腳產(chǎn)生外部中斷。發(fā)送數(shù)據(jù)字節(jié)長度可以動態(tài)改變，接收端也可以讀取到發(fā)送方實際發(fā)送字節(jié)長度。戰(zhàn)艦開發(fā)板為接收端。然后將接受數(shù)據(jù)通過USART1發(fā)送至電腦,使用DMA傳輸方式,波。STM32F103ZET6與NRF24L01 SPI通信速率為9MHz。24L01.c文件代碼#include "24l01.h"#include "lcd.h"#include "delay.h"#include "spi.h"const uint8_t TX_ADDRESSTX_ADR_WIDT

2、H=0x34,0x43,0x10,0x10,0x01; /發(fā)送地址const uint8_t RX_ADDRESSRX_ADR_WIDTH=0x34,0x43,0x10,0x10,0x01; /發(fā)送地址/初始化24L01的IO口void NRF24L01_Init(void) GPIO_InitTypeDef GPIO_InitStructure; SPI_InitTypeDef SPI_InitStructure;NVIC_InitTypeDefNVIC_InitStructure;EXTI_InitTypeDefEXTI_InitStructure;RCC_APB2PeriphClockC

3、md(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOD|RCC_APB2Periph_GPIOG |RCC_APB2Periph_AFIO, ENABLE); /使能PB,D,G端口時鐘 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; /PB12上拉 防止W25X的干擾 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; /推挽輸出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB, &G

4、PIO_InitStructure);/初始化指定IO GPIO_SetBits(GPIOB,GPIO_Pin_12);/上拉 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; /PD2推挽輸出上拉 禁止SD卡的干擾 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; /推挽輸出 GPIO_SetBits(GPIOD,GPIO_Pin_2);/初始化指定IOGPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;/PG6 7 推挽 GPIO_Init(GPIOG, &

5、amp;GPIO_InitStructure);/初始化指定IORCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);/使能復用功能時鐘GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOG, &GPIO_InitStructure);GPIO_EXTILineConfig(GPIO_Por

6、tSourceGPIOG,GPIO_PinSource8);EXTI_InitStructure.EXTI_Line = EXTI_Line8;EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;EXTI_InitStructure.EXTI_LineCmd = ENABLE;EXTI_Init(&EXTI_InitStructure);NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_I

7、RQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure); NRF24L01_CE=0; /使能24L01NRF24L01_CSN=1;/SPI片選取消 SPI2_Init(); /初始化SPI SPI_Cmd(SPI2, DISABLE); / SPI外設不使能SPI_

8、InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; /SPI設置為雙線雙向全雙工SPI_InitStructure.SPI_Mode = SPI_Mode_Master;/SPI主機 SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;/發(fā)送接收8位幀結(jié)構(gòu)SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;/時鐘懸空低SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;/數(shù)據(jù)捕獲于第1個時鐘沿SPI_Init

9、Structure.SPI_NSS = SPI_NSS_Soft;/NSS信號由軟件控制SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;/定義波特率預分頻的值:波特率預分頻值為16SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;/數(shù)據(jù)傳輸從MSB位開始SPI_InitStructure.SPI_CRCPolynomial = 7;/CRC值計算的多項式SPI_Init(SPI2, &SPI_InitStructure); /根據(jù)SPI_InitStr

10、uct中指定的參數(shù)初始化外設SPIx寄存器SPI_Cmd(SPI2, ENABLE); /使能SPI外設SPI2_SetSpeed(SPI_BaudRatePrescaler_4);/9MHz /檢測24L01是否存在/返回值:0，成功;1，失敗u8 NRF24L01_Check(void)u8 buf5=0XA5,0XA5,0XA5,0XA5,0XA5;u8 i;NRF24L01_Write_Buf(WRITE_REG_NRF+TX_ADDR,buf,5);/寫入5個字節(jié)的地址.NRF24L01_Read_Buf(TX_ADDR,buf,5); /讀出寫入的地址 for(i=0;i<5

11、;i+)if(bufi!=0XA5)break; if(i!=5)return 1;/檢測24L01錯誤return 0; /檢測到24L01 /SPI寫寄存器/reg:指定寄存器地址/value:寫入的值u8 NRF24L01_Write_Reg(u8 reg,u8 value)u8 status; NRF24L01_CSN=0; /使能SPI傳輸 status =SPI2_ReadWriteByte(reg);/發(fā)送寄存器號 SPI2_ReadWriteByte(value); /寫入寄存器的值 NRF24L01_CSN=1; /禁止SPI傳輸 return(status); /返回狀態(tài)值

12、/讀取SPI寄存器值/reg:要讀的寄存器u8 NRF24L01_Read_Reg(u8 reg)u8 reg_val; NRF24L01_CSN = 0; /使能SPI傳輸 SPI2_ReadWriteByte(reg); /發(fā)送寄存器號 reg_val=SPI2_ReadWriteByte(0XFF);/讀取寄存器內(nèi)容 NRF24L01_CSN = 1; /禁止SPI傳輸 return(reg_val); /返回狀態(tài)值/在指定位置讀出指定長度的數(shù)據(jù)/reg:寄存器(位置)/*pBuf:數(shù)據(jù)指針/len:數(shù)據(jù)長度/返回值,此次讀到的狀態(tài)寄存器值 u8 NRF24L01_Read_Buf(u8

13、 reg,u8 *pBuf,u8 len)u8 status,u8_ctr; NRF24L01_CSN = 0; /使能SPI傳輸 status=SPI2_ReadWriteByte(reg);/發(fā)送寄存器值(位置),并讀取狀態(tài)值 for(u8_ctr=0;u8_ctr<len;u8_ctr+) pBufu8_ctr=SPI2_ReadWriteByte(0XFF);/讀出數(shù)據(jù) NRF24L01_CSN=1; /關閉SPI傳輸 return status; /返回讀到的狀態(tài)值/在指定位置寫指定長度的數(shù)據(jù)/reg:寄存器(位置)/*pBuf:數(shù)據(jù)指針/len:數(shù)據(jù)長度/返回值,此次讀到的狀

14、態(tài)寄存器值u8 NRF24L01_Write_Buf(u8 reg, u8 *pBuf, u8 len)u8 status,u8_ctr; NRF24L01_CSN = 0; /使能SPI傳輸 status = SPI2_ReadWriteByte(reg);/發(fā)送寄存器值(位置),并讀取狀態(tài)值 for(u8_ctr=0; u8_ctr<len; u8_ctr+)SPI2_ReadWriteByte(*pBuf+); /寫入數(shù)據(jù) NRF24L01_CSN = 1; /關閉SPI傳輸 return status; /返回讀到的狀態(tài)值/啟動NRF24L01發(fā)送一次數(shù)據(jù)/txbuf:待發(fā)送數(shù)據(jù)

15、首地址/返回值:發(fā)送完成狀況u8 NRF24L01_TxPacket(u8 *txbuf,u8 length)u8 sta;NRF24L01_CE=0;if(length>=32)return 0;elseNRF24L01_Write_Buf(WR_TX_PLOAD,txbuf,length);/寫數(shù)據(jù)到TX BUF32個字節(jié) NRF24L01_CE=1;/啟動發(fā)送 while(NRF24L01_IRQ!=0);/等待發(fā)送完成sta=NRF24L01_Read_Reg(STATUS); /讀取狀態(tài)寄存器的值 NRF24L01_Write_Reg(WRITE_REG_NRF+STATUS,

16、sta); /清除TX_DS或MAX_RT中斷標志if(sta&MAX_TX)/達到最大重發(fā)次數(shù)NRF24L01_Write_Reg(FLUSH_TX,0xff);/清除TX FIFO寄存器 return MAX_TX; if(sta&TX_OK)/發(fā)送完成return TX_OK;return 0xff;/其他原因發(fā)送失敗/啟動NRF24L01發(fā)送一次數(shù)據(jù)/txbuf:待發(fā)送數(shù)據(jù)首地址/返回值:0，接收完成；其他，錯誤代碼u8 NRF24L01_RxPacket(u8 *rxbuf)u8 sta; sta=NRF24L01_Read_Reg(STATUS); /讀取狀態(tài)寄存器

17、的值 NRF24L01_Write_Reg(WRITE_REG_NRF+STATUS,sta); /清除TX_DS或MAX_RT中斷標志if(sta&RX_OK)/接收到數(shù)據(jù)NRF24L01_Read_Buf(RD_RX_PLOAD,rxbuf,RX_PLOAD_WIDTH);/讀取數(shù)據(jù)NRF24L01_Write_Reg(FLUSH_RX,0xff);/清除RX FIFO寄存器 return 0; return 1;/沒收到任何數(shù)據(jù) /該函數(shù)初始化NRF24L01到RX模式/設置RX地址,寫RX數(shù)據(jù)寬度,選擇RF頻道,波特率和LNA HCURR/當CE變高后,即進入RX模式,并可以接

18、收數(shù)據(jù)了 void NRF24L01_RX_Mode(void)NRF24L01_CE=0; NRF24L01_Write_Buf(WRITE_REG_NRF+RX_ADDR_P0,(u8*)RX_ADDRESS,RX_ADR_WIDTH);/寫RX節(jié)點地址 NRF24L01_Write_Reg(WRITE_REG_NRF+EN_AA,EN_P0); /使能通道0的自動應答 NRF24L01_Write_Reg(WRITE_REG_NRF+EN_RXADDR,EN_P0);/使能通道0的接收地址 NRF24L01_Write_Reg(WRITE_REG_NRF+RF_CH,40); /設置RF

19、通信頻率 NRF24L01_Write_Reg(WRITE_REG_NRF+RX_PW_P0,RX_PLOAD_WIDTH);/選擇通道0的有效數(shù)據(jù)寬度 NRF24L01_Write_Reg(WRITE_REG_NRF+RF_SETUP,0x0f);/設置TX發(fā)射參數(shù),0db增益,2Mbps,低噪聲增益開啟 NRF24L01_Write_Reg(WRITE_REG_NRF+CONFIG, 0x0f);/配置基本工作模式的參數(shù);PWR_UP,EN_CRC,16BIT_CRC,接收模式 #if EN_DYNAMIC_DATA_LENGTH /使能動態(tài)數(shù)據(jù)長度NRF24L01_Write_Reg(W

20、RITE_REG_NRF+FEATURE,EN_DPL);NRF24L01_Write_Reg(WRITE_REG_NRF+DYNPD,EN_P0);#endif NRF24L01_CE = 1; /CE為高,130us進入接收模式 delay_us(500); /該函數(shù)初始化NRF24L01到TX模式/設置TX地址,寫TX數(shù)據(jù)寬度,設置RX自動應答的地址,填充TX發(fā)送數(shù)據(jù),選擇RF頻道,波特率和LNA HCURR/PWR_UP,CRC使能/當CE變高后,即進入RX模式,并可以接收數(shù)據(jù)了 /CE為高大于10us,則啟動發(fā)送. void NRF24L01_TX_Mode(void) NRF24L

21、01_CE=0; NRF24L01_Write_Buf(WRITE_REG_NRF+TX_ADDR,(u8*)TX_ADDRESS,TX_ADR_WIDTH);/寫TX節(jié)點地址 NRF24L01_Write_Buf(WRITE_REG_NRF+RX_ADDR_P0,(u8*)RX_ADDRESS,RX_ADR_WIDTH); /設置TX節(jié)點地址,主要為了使能ACK NRF24L01_Write_Reg(WRITE_REG_NRF+EN_AA,EN_P0); /使能通道0的自動應答 NRF24L01_Write_Reg(WRITE_REG_NRF+EN_RXADDR,EN_P0); /使能通道0

22、的接收地址 NRF24L01_Write_Reg(WRITE_REG_NRF+SETUP_RETR,0x1a);/設置自動重發(fā)間隔時間:500us + 86us;最大自動重發(fā)次數(shù):10次#if EN_DYNAMIC_DATA_LENGTH /動態(tài)數(shù)據(jù)長度發(fā)送NRF24L01_Write_Reg(WRITE_REG_NRF+FEATURE,EN_DPL);NRF24L01_Write_Reg(WRITE_REG_NRF+DYNPD,EN_P0);#endif NRF24L01_Write_Reg(WRITE_REG_NRF+RF_CH,40); /設置RF通道為40 NRF24L01_Write

23、_Reg(WRITE_REG_NRF+RF_SETUP,0x0f); /設置TX發(fā)射參數(shù),0db增益,2Mbps,低噪聲增益開啟 NRF24L01_Write_Reg(WRITE_REG_NRF+CONFIG,0x0e); /配置基本工作模式的參數(shù);PWR_UP,EN_CRC,16BIT_CRC,發(fā)射模式,開啟所有中斷 NRF24L01_CE=1;/CE為高,10us后啟動發(fā)送delay_us(20); 24L01.h文件#ifndef _24L01_H#define _24L01_H #include "sys.h" #include <stdint.h>/*

24、Enable dynamic length, not need send or receive packet data of a fixed length */#defineEN_DYNAMIC_DATA_LENGTH1 /使能動態(tài)數(shù)據(jù)長度/*NRF24L01 type*/#define_NRF24L01/#define_NRF24L01P/#define_NRF24L01N#if defined(_NRF24L01) && defined(_NRF24L01P) #error "You can only select one of NRF24L01x,not two

25、 or more!"#endif#if defined(_NRF24L01) && defined(_NRF24L01N) #error "You can only select one of NRF24L01x,not two or more!"#endif#if defined(_NRF24L01P) && defined(_NRF24L01N) #error "You can only select one of NRF24L01x,not two or more!"#endif#defineRESERVE

26、D0x00#defineEN_P50x20#defineEN_P40x10#defineEN_P30x08#defineEN_P20x04#defineEN_P10x02#defineEN_P00x01/NRF24L01寄存器操作命令#define READ_REG_NRF0x00 /讀配置寄存器,低5位為寄存器地址#define WRITE_REG_NRF0x20 /寫配置寄存器,低5位為寄存器地址#define RD_RX_PLOAD 0x61 /讀RX有效數(shù)據(jù),132字節(jié)#define WR_TX_PLOAD 0xA0 /寫TX有效數(shù)據(jù),132字節(jié)#define FLUSH_TX 0xE

27、1 /清除TX FIFO寄存器.發(fā)射模式下用#define FLUSH_RX 0xE2 /清除RX FIFO寄存器.接收模式下用#define REUSE_TX_PL 0xE3 /重新使用上一包數(shù)據(jù),CE為高,數(shù)據(jù)包被不斷發(fā)送.#defineR_RX_PL_WID0x60 /讀取動態(tài)數(shù)據(jù)長度接受時讀取接受到有效數(shù)據(jù)的數(shù)目#define NOP 0xFF /空操作,可以用來讀狀態(tài)寄存器 /SPI(NRF24L01)寄存器地址#define CONFIG 0x00 /配置寄存器地址;bit0:1接收模式,0發(fā)射模式;bit1:電選擇;bit2:CRC模式;bit3:CRC使能; /bit4:中斷M

28、AX_RT(達到最大重發(fā)次數(shù)中斷)使能;bit5:中斷TX_DS使能;bit6:中斷RX_DR使能#define EN_AA 0x01 /使能自動應答功能 bit05,對應通道05#define EN_RXADDR 0x02 /接收地址允許,bit05,對應通道05#define SETUP_AW 0x03 /設置地址寬度(所有數(shù)據(jù)通道):bit1,0:00,3字節(jié);01,4字節(jié);02,5字節(jié);#define SETUP_RETR 0x04 /建立自動重發(fā);bit3:0,自動重發(fā)計數(shù)器;bit7:4,自動重發(fā)延時 250*x+86us#define RF_CH 0x05 /RF通道,bit6:

29、0,工作通道頻率;#define RF_SETUP 0x06 /RF寄存器;bit3:傳輸速率(0:1Mbps,1:2Mbps);bit2:1,發(fā)射功率;bit0:低噪聲放大器增益#ifdefined(_NRF24L01P)#defineCONT_WAVE(1<<7)#defineRF_DR_RATE_1Mbps0#defineRF_DR_RATE_2Mbps(1<<0)#defineRF_DR_RATE_250kbps(1<<1)#defineRF_DR_RATE_Reserved(1<<0) | (1<<1)#endif#defi

30、ne STATUS 0x07 /狀態(tài)寄存器;bit0:TX FIFO滿標志;bit3:1,接收數(shù)據(jù)通道號(最大:6);bit4,達到最多次重發(fā) /bit5:數(shù)據(jù)發(fā)送完成中斷;bit6:接收數(shù)據(jù)中斷;#define MAX_TX 0x10 /達到最大發(fā)送次數(shù)中斷#define TX_OK 0x20 /TX發(fā)送完成中斷#define RX_OK 0x40 /接收到數(shù)據(jù)中斷#define OBSERVE_TX 0x08 /發(fā)送檢測寄存器,bit7:4,數(shù)據(jù)包丟失計數(shù)器;bit3:0,重發(fā)計數(shù)器#define CD 0x09 /載波檢測寄存器,bit0,載波檢測;#define RX_ADDR_P0

31、0x0A /數(shù)據(jù)通道0接收地址,最大長度5個字節(jié),低字節(jié)在前#define RX_ADDR_P1 0x0B /數(shù)據(jù)通道1接收地址,最大長度5個字節(jié),低字節(jié)在前#define RX_ADDR_P2 0x0C /數(shù)據(jù)通道2接收地址,最低字節(jié)可設置,高字節(jié),必須同RX_ADDR_P139:8相等;#define RX_ADDR_P3 0x0D /數(shù)據(jù)通道3接收地址,最低字節(jié)可設置,高字節(jié),必須同RX_ADDR_P139:8相等;#define RX_ADDR_P4 0x0E /數(shù)據(jù)通道4接收地址,最低字節(jié)可設置,高字節(jié),必須同RX_ADDR_P139:8相等;#define RX_ADDR_P5 0

32、x0F /數(shù)據(jù)通道5接收地址,最低字節(jié)可設置,高字節(jié),必須同RX_ADDR_P139:8相等;#define TX_ADDR 0x10 /發(fā)送地址(低字節(jié)在前),ShockBurstTM模式下,RX_ADDR_P0與此地址相等#define RX_PW_P0 0x11 /接收數(shù)據(jù)通道0有效數(shù)據(jù)寬度(132字節(jié)),設置為0則非法#define RX_PW_P1 0x12 /接收數(shù)據(jù)通道1有效數(shù)據(jù)寬度(132字節(jié)),設置為0則非法#define RX_PW_P2 0x13 /接收數(shù)據(jù)通道2有效數(shù)據(jù)寬度(132字節(jié)),設置為0則非法#define RX_PW_P3 0x14 /接收數(shù)據(jù)通道3有效數(shù)據(jù)

33、寬度(132字節(jié)),設置為0則非法#define RX_PW_P4 0x15 /接收數(shù)據(jù)通道4有效數(shù)據(jù)寬度(132字節(jié)),設置為0則非法#define RX_PW_P5 0x16 /接收數(shù)據(jù)通道5有效數(shù)據(jù)寬度(132字節(jié)),設置為0則非法#define NRF_FIFO_STATUS 0x17 /FIFO狀態(tài)寄存器;bit0,RX FIFO寄存器空標志;bit1,RX FIFO滿標志;bit2,3,保留 /bit4,TX FIFO空標志;bit5,TX FIFO滿標志;bit6,1,循環(huán)發(fā)送上一數(shù)據(jù)包.0,不循環(huán);#defineDYNPD0x1C /使能動態(tài)載荷長度寄存器#defineFEAT

34、URE0x1D /特性寄存器#defineEN_DPL0x04 #defineEN_ACK_PAY0x02#defineEN_DYN_ACK0x01/24L01操作線#define NRF24L01_CE PGout(6) /24L01片選信號#define NRF24L01_CSN PGout(7) /SPI片選信號 #define NRF24L01_IRQ PGin(8) /IRQ主機數(shù)據(jù)輸入/24L01發(fā)送接收數(shù)據(jù)寬度定義#define TX_ADR_WIDTH 5 /5字節(jié)的地址寬度#define RX_ADR_WIDTH 5 /5字節(jié)的地址寬度#define TX_PLOAD_WID

35、TH 16 /32字節(jié)的用戶數(shù)據(jù)寬度#define RX_PLOAD_WIDTH 16 /32字節(jié)的用戶數(shù)據(jù)寬度typedefstructu8 Recv_Buf1RX_PLOAD_WIDTH;/接受緩沖區(qū)1u8 Recv_Buf2RX_PLOAD_WIDTH;/接受緩沖區(qū)2u8 Recv_ValidData_Length;/接受到合法數(shù)據(jù)長度u8 *pRecv_Buf_Point;/指向接受緩沖區(qū)的首地址u8 Recv_Data_Flag;/接受到數(shù)據(jù)標志位NRF24L01_RECV_DATA_TYPE;extern NRF24L01_RECV_DATA_TYPEnrf24l01_Recv_D

36、ata_Param;void NRF24L01_Init(void);/初始化void NRF24L01_RX_Mode(void);/配置為接收模式void NRF24L01_TX_Mode(void);/配置為發(fā)送模式u8 NRF24L01_Write_Buf(u8 reg, u8 *pBuf, u8 u8s);/寫數(shù)據(jù)區(qū)u8 NRF24L01_Read_Buf(u8 reg, u8 *pBuf, u8 u8s);/讀數(shù)據(jù)區(qū) u8 NRF24L01_Read_Reg(u8 reg);/讀寄存器u8 NRF24L01_Write_Reg(u8 reg, u8 value);/寫寄存器u8 N

37、RF24L01_Check(void);/檢查24L01是否存在u8 NRF24L01_RxPacket(u8 *rxbuf);/接收一個包的數(shù)據(jù)u8 NRF24L01_TxPacket(u8 *txbuf,u8 length);#endifMain.c文件#include "led.h"#include "delay.h"#include "sys.h"#include "24l01.h" #include "usart.h"#include <string.h>NRF24L01_

38、RECV_DATA_TYPEnrf24l01_Recv_Data_Param;u8 U8_USART3_TX_BUF100; void NRF24L01_IRQHandler(void);void Error_Handler(void); int main(void) delay_init(); NVIC_Configuration(); LED_Init(); USART_Config();delay_ms(1500);/戰(zhàn)艦版USB-232接口通電,程序會短暫復位,避免影響后面接收delay_ms(1500); NRF24L01_Init(); /* Check the existance of NRF24L01 or the SPI communication between MCU and NRF24L01 is working normally or not */ while(NRF24L01_Check()Error_Handler();/* Set the pRecv_Buf_Point point to the buf1 */nrf24l01_Recv_Data_Param.pRecv_Buf_Point