?? nrf24l01.c
字號:
#include <intrins.h>
#include "define.h"
#include "nrf24l01.h"
/***************************************************************************************/
/* NRF24L01 的管腳定義，以及在本程序中的應用，VCC接3.3V電源，可以通過5V用電壓轉換芯片
/*得到，NC 管腳可以接可以不接，暫時沒用途。本程序應用于51或者52單片機，是兩個模塊進行通訊
/*成功的簡單指示，現象是：模塊1的 KEY1 對應模塊1的LED1 和模塊2的LED3 ,模塊1的 KEY2 對應模
/*塊1的LED2 和模塊2的LED4，發過來也對應。
/***************************************************************************************/
/*****************************************長延時*****************************************/
void Delay(unsigned int s)
{
unsigned int i;
for(i=0; i<s; i++);
for(i=0; i<s; i++);
}
/******************************************************************************************/
/*延時函數
/******************************************************************************************/
void inerDelay_us(unsigned char n) //延時，us 級
{
for(;n>0;n--)
_nop_();
}
/****************************************************************************************/
/*NRF24L01初始化
/***************************************************************************************/
void init_NRF24L01(void)
{
inerDelay_us(100);
CE=0; // 芯片使能
CSN=1; // 禁止 SPI
SCK=0; // SPI時鐘置低
SPI_Write_Buf(WRITE_REG + TX_ADDR, TX_ADDRESS, TX_ADR_WIDTH); // 寫本地地址
SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, RX_ADDRESS, RX_ADR_WIDTH); // 寫接收端地址
SPI_RW_Reg(WRITE_REG + EN_AA, 0x01); // 頻道0自動 ACK應答允許
SPI_RW_Reg(WRITE_REG + EN_RXADDR, 0x01); // 允許接收地址只有頻道0，如果需要多頻道可以參考Page21
SPI_RW_Reg(WRITE_REG + RF_CH, 0x02); // 設置信道工作為2.4GHZ，收發必須一致
SPI_RW_Reg(WRITE_REG + RX_PW_P0, RX_PLOAD_WIDTH); //設置接收數據長度，本次設置為32字節
SPI_RW_Reg(WRITE_REG + RF_SETUP, 0x07); //設置發射速率為1MHZ，發射功率為最大值0dB
}
/****************************************************************************************************/
/*函數：unsigned int SPI_RW(unsigned int unsigned char)
/*功能：NRF24L01的SPI寫時序-----根據SPI協議，寫一字節數據到nRF24L01，同時從nRF24L01 讀出一字節
/****************************************************************************************************/
unsigned int SPI_RW(unsigned int dat)
{
unsigned int i;
for(i=0;i<8;i++) // 循環8次
{
MOSI = (dat & 0x80); // dat的最高位輸出到MOSI MSB to MOSI
inerDelay_us(DELAY);
dat = (dat << 1); // 從右向左進一位 shift next bit into MSB..
SCK = 1; // 拉高SCK，nRF24L01從MOSI讀入1位數據，同時從MISO輸出1位數據 Set SCK high..
inerDelay_us(DELAY);
dat |= MISO; //讀MISO到 dat 最低位 capture current MISO bit
inerDelay_us(DELAY);
SCK = 0; // SCK置低 ..then set SCK low again
inerDelay_us(DELAY);
}
return(dat); //返回讀出的一字節 return read dat
}
/****************************************************************************************************
/*函數：unsigned char SPI_Read(unsigned char reg)
/*功能：NRF24L01的SPI時序-----------從reg寄存器讀一字節
/****************************************************************************************************/
unsigned char SPI_Read(unsigned char reg)
{
unsigned char reg_val;
CSN = 0; //CSN置低，開始傳輸數據 CSN low, initialize SPI communication...
inerDelay_us(DELAY);
SPI_RW(reg); //選擇寄存器 Select register to read from..
reg_val = SPI_RW(0); //然后從該寄存器讀數據 ..then read registervalue
CSN = 1; //CSN拉高，結束數據傳輸 CSN high, terminate SPI communication
inerDelay_us(DELAY);
return(reg_val); //返回寄存器數據 return register value
}
/****************************************************************************************************/
/*功能：NRF24L01讀寫寄存器函數
/*描述：寫數據value到reg寄存器
/****************************************************************************************************/
unsigned int SPI_RW_Reg(unsigned char reg, unsigned char value)
{
unsigned char status;
CSN = 0; // CSN置低，開始傳輸數據 CSN low, init SPI transaction
inerDelay_us(DELAY);
status = SPI_RW(reg); // 選擇寄存器，同時返回狀態字 select register
SPI_RW(value); // 然后寫數據到該寄存器 ..and write value to it..
CSN = 1; // CSN拉高，結束數據傳輸 CSN high again
inerDelay_us(DELAY);
return(status); // 返回狀態寄存器 return nRF24L01 status unsigned char
}
/****************************************************************************************************/
/*函數：unsigned int SPI_Read_Buf(unsigned char reg, unsigned char *pBuf, unsigned char unsigned chars)
/*功能: 用于讀數據，reg：為寄存器地址，pBuf：為待讀出數據地址，unsigned chars：讀出數據的個數
/*描述: 從reg寄存器讀出bytes個字節，通常用來讀取接收通道數據或接收/發送地址
/****************************************************************************************************/
unsigned int SPI_Read_Buf(unsigned char reg, unsigned char *pBuf, unsigned char uchars)
{
unsigned int status,i;
CSN = 0; //CSN置低，開始傳輸數據 Set CSN low, init SPI tranaction
inerDelay_us(DELAY);
status = SPI_RW(reg); //選擇寄存器，同時返回狀態字 Select register to write to and read status unsigned char
for(i=0;i<uchars;i++)
pBuf[i] = SPI_RW(0); //逐個字節從nRF24L01讀出
CSN = 1; //CSN拉高，結束數據傳輸
inerDelay_us(DELAY);
return(status); //返回狀態寄存器 return nRF24L01 status unsigned char
}
/*********************************************************************************************************
/*函數：unsigned int SPI_Write_Buf(unsigned char reg, unsigned char *pBuf, unsigned char unsigned chars)
/*功能: 用于寫數據：為寄存器地址，pBuf：為待寫入數據地址，unsigned chars：寫入數據的個數
/*描述：把pBuf緩存中的數據寫入到nRF24L01，通常用來寫入發射通道數據或接收/發送地址
/*********************************************************************************************************/
unsigned int SPI_Write_Buf(unsigned char reg, unsigned char *pBuf, unsigned char uchars)
{
unsigned int status,i;
CSN = 0; //CSN置低，開始傳輸數據
inerDelay_us(DELAY);
status = SPI_RW(reg); //選擇寄存器，同時返回狀態字
inerDelay_us(DELAY);
for(i=0; i<uchars; i++)
SPI_RW(*pBuf++); //逐個字節寫入nRF24L01
CSN = 1; //CSN拉高，結束數據傳輸
inerDelay_us(DELAY);
return(status); //返回狀態寄存器
}
/****************************************************************************************************/
/*函數：void SetRX_Mode(void)
/*功能：數據接收配置
/****************************************************************************************************/
void SetRX_Mode(void)
{
CE=0;
inerDelay_us(DELAY);
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0f);//CRC使能，16位CRC校驗，上電，接收模式
CE = 1; // 拉高CE啟動接收設備
inerDelay_us(DELAY);
inerDelay_us(130);
}
/******************************************************************************************************/
/*函數：unsigned char nRF24L01_RxPacket(unsigned char* rx_buf)
/*功能：數據讀取后放入rx_buf接收緩沖區中
/******************************************************************************************************/
unsigned char nRF24L01_RxPacket(unsigned char* rx_buf)
{
unsigned char revale=0;
sta=SPI_Read(STATUS); // 讀取狀態寄存其來判斷數據接收狀況
if(RX_DR) // 判斷是否接收到數據
{
CE = 0; //SPI使能
inerDelay_us(DELAY);
SPI_Read_Buf(RD_RX_PLOAD,rx_buf,TX_PLOAD_WIDTH);// read receive payload from RX_FIFO buffer
revale =1; //讀取數據完成標志
}
SPI_RW_Reg(WRITE_REG+STATUS,sta); //接收到數據后RX_DR,TX_DS,MAX_PT都置高為1，通過寫1來清楚中斷標志
return revale;
}
/***********************************************************************************************************
/*函數：void nRF24L01_TxPacket(unsigned char * tx_buf)
/*功能：發送 tx_buf中數據
/**********************************************************************************************************/
void nRF24L01_TxPacket(unsigned char * tx_buf)
{
CE=0; //StandBy I模式
inerDelay_us(DELAY);
SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, TX_ADDRESS, TX_ADR_WIDTH); // 裝載接收端地址
SPI_Write_Buf(WR_TX_PLOAD, tx_buf, TX_PLOAD_WIDTH); // 裝載數據
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0e); // IRQ收發完成中斷響應，16位CRC，主發送
CE=1; //置高CE，激發數據發送
inerDelay_us(130);
}
void nRF24L01_Initial(void)
{
CE=0;// chip enable
CSN=1;// Spi disable
SCK=0;// Spi clock line init high
MOSI = 1;//mosi input
IRQ = 1;//IRQ input
}
/**************************************************
Function: RX_Mode();
Description:
This function initializes one nRF24L01 device to
RX Mode, set RX address, writes RX payload width,
select RF channel, datarate & LNA HCURR.
After init, CE is toggled high, which means that
this device is now ready to receive a datapacket. */
/**************************************************/
/*
void RX_Mode(void)
{
CE=0;
inerDelay_us(10);
// DI();
SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, RX_ADDRESS, RX_ADR_WIDTH); // Use the same address on the RX device as the TX device
//SPI_RW_Reg(WRITE_REG + EN_AA, 0x01); // Enable Auto.Ack:Pipe0
SPI_RW_Reg(WRITE_REG + EN_AA, 0x00); // disable Auto.Ack:Pipe0
SPI_RW_Reg(WRITE_REG + EN_RXADDR, 0x01); // Enable Pipe0
SPI_RW_Reg(WRITE_REG + SETUP_AW, 0x03);//5byte的地址
SPI_RW_Reg(WRITE_REG + SETUP_RETR, 0x00);//禁止重發
SPI_RW_Reg(WRITE_REG + RF_CH, 20); // Select RF channel 2440M
SPI_RW_Reg(WRITE_REG + RX_PW_P0, TX_PLOAD_WIDTH); // Select same RX payload width as TX Payload width
SPI_RW_Reg(WRITE_REG + RF_SETUP, 0x07); // TX_PWR:0dBm, Datarate:2Mbps, LNA:HCURR
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0f); // Set PWR_UP bit, enable CRC(2 bytes) & Prim:RX. RX_DR enabled..
// EI();
CE=1;
inerDelay_us(500);
//IE0 = 0;
// This device is now ready to receive one packet of 16 bytes payload from a TX device sending to address
// '3443101001', with auto acknowledgment, retransmit count of 10, RF channel 40 and datarate = 2Mbps.
}*/
void RX_Mode(void)
{
CE=0;
SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, TX_ADDRESS, TX_ADR_WIDTH);
SPI_RW_Reg(WRITE_REG + EN_AA, 0x01); // Enable Auto.Ack:Pipe0
SPI_RW_Reg(WRITE_REG + EN_RXADDR, 0x01); // Enable Pipe0
SPI_RW_Reg(WRITE_REG + RF_CH, 40); // Select RF channel 40
SPI_RW_Reg(WRITE_REG + RX_PW_P0, TX_PLOAD_WIDTH); //& Prim:RX. RX_DR enabled..
SPI_RW_Reg(WRITE_REG + RF_SETUP, 0x07);
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0f);
CE = 1;
}
/**************************************************/
/**************************************************
Function: TX_Mode();
Description:
This function initializes one nRF24L01 device to
TX mode, set TX address, set RX address for auto.ack,
fill TX payload, select RF channel, datarate & TX pwr.
PWR_UP is set, CRC(2 bytes) is enabled, & PRIM:TX.
ToDo: One high pulse(>10us) on CE will now send this
packet and expext an acknowledgment from the RX device. */
/**************************************************/
/*
void TX_Mode(unsigned char *Rf_Send_Buf)
{
CE=0;
inerDelay_us(10);
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, Buffer, TX_PLOAD_WIDTH); // Writes data to TX payload
SPI_Write_Buf(WR_TX_PLOAD, Rf_Send_Buf, TX_PLOAD_WIDTH); // Writes data to TX payload
//SPI_RW_Reg(WRITE_REG + EN_AA, 0x01); // Enable Auto.Ack:Pipe0
SPI_RW_Reg(WRITE_REG + EN_AA, 0x00); // disable Auto.Ack:Pipe0
SPI_RW_Reg(WRITE_REG + EN_RXADDR, 0x01); // Enable Pipe0
SPI_RW_Reg(WRITE_REG + SETUP_AW, 0x03);//5byte的地址
//SPI_RW_Reg(WRITE_REG + SETUP_RETR, 0x1a); // 500us + 86us, 10 retrans...
SPI_RW_Reg(WRITE_REG + SETUP_RETR, 0x00);//禁止重發
SPI_RW_Reg(WRITE_REG + RF_CH, 20); // Select RF channel 2440M
SPI_RW_Reg(WRITE_REG + RF_SETUP, 0x07); // TX_PWR:0dBm, Datarate:2Mbps, LNA:HCURR
SPI_RW_Reg(WRITE_REG + RX_PW_P0, TX_PLOAD_WIDTH); //設置發送數據長度，本次設置為32字節
//SPI_RW_Reg(WRITE_REG + CONFIG, 0x0e); // Set PWR_UP bit, enable CRC(2 bytes) & Prim:TX. MAX_RT & TX_DS enabled..
SPI_RW_Reg(WRITE_REG + CONFIG, 0x3e);//
CE=1;
inerDelay_us(500);
SPI_RW_Reg(FLUSH_TX, 0x00);
SPI_RW_Reg(WRITE_REG + STATUS, 0x70);//RESET INTTERUPT
//IE0 = 0;
}
*/
void TX_Mode(unsigned char *Rf_Send_Buf)
{
CE=0;
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);
SPI_Write_Buf(WR_TX_PLOAD, Rf_Send_Buf, TX_PLOAD_WIDTH); // Writes data to TX payload
SPI_RW_Reg(WRITE_REG + EN_AA, 0x01); // Enable Auto.Ack:Pipe0
SPI_RW_Reg(WRITE_REG + EN_RXADDR, 0x01); // Enable Pipe0
SPI_RW_Reg(WRITE_REG + SETUP_RETR, 0x1a); // 500us + 86us, 10 retrans...
SPI_RW_Reg(WRITE_REG + RF_CH, 40); // Select RF channel 40
SPI_RW_Reg(WRITE_REG + RF_SETUP, 0x07); // TX_PWR:0dBm, Datarate:2Mbps, LNA:HCURR
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0e);
CE=1;
inerDelay_us(130);
}
void rec_rf_data(unsigned char *Rf_Rec_Buf)
{
SPI_Read_Buf(RD_RX_PLOAD,Rf_Rec_Buf,TX_PLOAD_WIDTH);
RX_Mode();
SPI_RW_Reg(WRITE_REG + STATUS, 0x70);//RESET INTTERUPT
}
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