?? nrf24l01.c
字號:
#include "NRF24L01.h"
#define CE MCF_GPIO_PORTQS_PORTQS5
#define CSN MCF_GPIO_PORTQS_PORTQS2
#define MOSI MCF_GPIO_PORTQS_PORTQS1
#define SCK MCF_GPIO_PORTQS_PORTQS0
#define CE_1 MCF_GPIO_PORTQS|=CE
#define CSN_1 MCF_GPIO_PORTQS|=CSN
#define MOSI_1 MCF_GPIO_PORTQS|=MOSI
#define SCK_1 MCF_GPIO_PORTQS|=SCK
#define CE_0 MCF_GPIO_PORTQS&=~CE
#define CSN_0 MCF_GPIO_PORTQS&=~CSN
#define MOSI_0 MCF_GPIO_PORTQS&=~MOSI
#define SCK_0 MCF_GPIO_PORTQS&=~SCK
#define IRQ MCF_GPIO_PORTQS_PORTQS6
#define MISO MCF_GPIO_PORTQS_PORTQS3
#define GMISO MCF_GPIO_SETQS&MISO
#define GIRQ MCF_GPIO_SETQS&IRQ
uint sta; //狀態(tài)標(biāo)志
#define RX_DR 0x40
#define TX_DS 0x20
#define MAX_RT 0x10
uchar TX_ADDRESS[TX_ADR_WIDTH]= {0x34,0x43,0x10,0x10,0x01}; //本地地址
uchar RX_ADDRESS[RX_ADR_WIDTH]= {0x34,0x43,0x10,0x10,0x01}; //接收地址
uchar RxBuf[32]; //接收緩沖區(qū)
//*****************************************延時*****************************************
void Delay(unsigned int s)
{
int ii,jj;
for(ii=0;ii<s;ii++)
for(jj=0;jj<2000;jj++);
}
void inerDelay_us(unsigned char n)
{
int ii,jj;
for(ii=0;ii<n;ii++)
for(jj=0;jj<2;jj++);
}
//****************************************************************************************
/*NRF24L01初始化
//***************************************************************************************/
void init_NRF24L01(void)
{
MCF_GPIO_PQSPAR = 0x00; // 配置PTJ為普通IO
MCF_GPIO_DDRQS = 0xff // 設(shè)置PTJ為輸出
&~MISO
&~IRQ;
MCF_GPIO_PORTQS = 0x00; //關(guān)閉PTJ口
inerDelay_us(100);
CE_0; // chip enable
CSN_1; // Spi disable
SCK_0; // Spi clock line init high
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(yīng)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, 0); // 設(shè)置信道工作為2.4GHZ，收發(fā)必須一致
SPI_RW_Reg(WRITE_REG + RX_PW_P0, RX_PLOAD_WIDTH); //設(shè)置接收數(shù)據(jù)長度，本次設(shè)置為32字節(jié)
SPI_RW_Reg(WRITE_REG + RF_SETUP, 0x07); //設(shè)置發(fā)射速率為1MHZ，發(fā)射功率為最大值0dB
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0e); // IRQ收發(fā)完成中斷響應(yīng)，16位CRC，主發(fā)送
CE_1;
}
/****************************************************************************************************
/*函數(shù)：uint SPI_RW(uint uchar)
/*功能：NRF24L01的SPI寫時序
/****************************************************************************************************/
uint SPI_RW(uint data)
{
uint bit_ctr;
for(bit_ctr=0;bit_ctr<8;bit_ctr++) // output 8-bit
{
if(data & 0x80)MOSI_1; // output 'uchar', MSB to MOSI
else MOSI_0;
data = (data << 1); // shift next bit into MSB..
SCK_1; // Set SCK high..
if(GMISO)data |= 1; // capture current MISO bit
SCK_0; // ..then set SCK low again
}
//sta=data;
return(data); // return read uchar
}
/****************************************************************************************************
/*函數(shù)：uchar SPI_Read(uchar reg)
/*功能：NRF24L01的SPI時序
/****************************************************************************************************/
uchar SPI_Read(uchar reg)
{
uchar reg_val;
CSN_0; // CSN low, initialize SPI communication...
SPI_RW(reg); // Select register to read from..
reg_val = SPI_RW(0); // ..then read registervalue
CSN_1; // CSN high, terminate SPI communication
return(reg_val); // return register value
}
/****************************************************************************************************/
/*功能：NRF24L01讀寫寄存器函數(shù)
/****************************************************************************************************/
uint SPI_RW_Reg(uchar reg, uchar value)
{
uint status;
CSN_0; // CSN low, init SPI transaction
status = SPI_RW(reg); // select register
SPI_RW(value); // ..and write value to it..
CSN_1; // CSN high again
return(status); // return nRF24L01 status uchar
}
/****************************************************************************************************/
/*函數(shù)：uint SPI_Read_Buf(uchar reg, uchar *pBuf, uchar uchars)
/*功能: 用于讀數(shù)據(jù)，reg：為寄存器地址，pBuf：為待讀出數(shù)據(jù)地址，uchars：讀出數(shù)據(jù)的個數(shù)
/****************************************************************************************************/
uint SPI_Read_Buf(uchar reg, uchar *pBuf, uchar uchars)
{
uint status,uchar_ctr;
CSN_0; // Set CSN low, init SPI tranaction
status = SPI_RW(reg); // Select register to write to and read status uchar
for(uchar_ctr=0;uchar_ctr<uchars;uchar_ctr++)
pBuf[uchar_ctr] = SPI_RW(0); //
CSN_1;
return(status); // return nRF24L01 status uchar
}
/*********************************************************************************************************
/*函數(shù)：uint SPI_Write_Buf(uchar reg, uchar *pBuf, uchar uchars)
/*功能: 用于寫數(shù)據(jù)：為寄存器地址，pBuf：為待寫入數(shù)據(jù)地址，uchars：寫入數(shù)據(jù)的個數(shù)
/*********************************************************************************************************/
uint SPI_Write_Buf(uchar reg, uchar *pBuf, uchar uchars)
{
uint status,uchar_ctr;
CSN_0; //SPI使能
status = SPI_RW(reg);
for(uchar_ctr=0; uchar_ctr<uchars; uchar_ctr++) //
SPI_RW(*pBuf++);
CSN_1; //關(guān)閉SPI
return(status); //
}
/****************************************************************************************************/
/*函數(shù)：void SetRX_Mode(void)
/*功能：數(shù)據(jù)接收配置
/****************************************************************************************************/
void SetRX_Mode(void)
{
CE_0;
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0f); // IRQ收發(fā)完成中斷響應(yīng)，16位CRC ，主接收
CE_1;
inerDelay_us(130); //延時不能太短
}
/******************************************************************************************************/
/*函數(shù)：unsigned char nRF24L01_RxPacket(unsigned char* rx_buf)
/*功能：數(shù)據(jù)讀取后放如rx_buf接收緩沖區(qū)中
/******************************************************************************************************/
unsigned char nRF24L01_RxPacket(uchar* rx_buf)
{
unsigned char revale=0;
SetRX_Mode();
sta=SPI_Read(STATUS); // 讀取狀態(tài)寄存其來判斷數(shù)據(jù)接收狀況
if(RX_DR&sta) // 判斷是否接收到數(shù)據(jù)
{
CE_0; //SPI使能
SPI_Read_Buf(RD_RX_PLOAD,rx_buf,TX_PLOAD_WIDTH);// read receive payload from RX_FIFO buffer
revale =1; //讀取數(shù)據(jù)完成標(biāo)志
CE_1;
}
SPI_RW_Reg(WRITE_REG+STATUS,sta); //接收到數(shù)據(jù)后RX_DR,TX_DS,MAX_PT都置高為1，通過寫1來清楚中斷標(biāo)志
//SPI_RW(FLUSH_RX);
//SPI_RW(FLUSH_TX);
return revale;
}
/***********************************************************************************************************
/*函數(shù)：void nRF24L01_TxPacket(unsigned char * tx_buf)
/*功能：發(fā)送 tx_buf中數(shù)據(jù)
/**********************************************************************************************************/
void nRF24L01_TxPacket(uchar * tx_buf)
{
CE_0; //StandBy I模式
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(shù)據(jù)
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0e); // IRQ收發(fā)完成中斷響應(yīng)，16位CRC，主發(fā)送
SPI_RW_Reg(WRITE_REG+STATUS,0X7E);
CE_1; //置高CE，激發(fā)數(shù)據(jù)發(fā)送
Delay(10000); //可變
}
uchar TxBuf[32]= //發(fā)送緩沖區(qū)
{/*"12345678abvdefg"*/
0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,
0x09,0x10,0x11,0x12,0x13,0x14,0x15,0x16,
0x17,0x18,0x19,0x20,0x21,0x22,0x23,0x24,
0x25,0x26,0x27,0x28,0x29,0x30,0x31,0x32,
};
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