#define NRF_MOSI_LOW()
#define NRF_MOSI_HIGH()
#define NRF_MISO_Read()
#define NRF_CS_LOW()
#define NRF_CS_HIGH()
#define NRF_SCK_LOW()
#define NRF_SCK_HIGH()
#define NRF_CE_LOW()
#define NRF_CE_HIGH()
#define NRF_IRQ_Read()
#define AddressWIDTH5 //地址的寬度
#define DataWIDTH4 //數據寬度
// SPI(nRF24L01) commands ,
#define NRF_READ_REG 0x00 // Define read command to register
#define NRF_WRITE_REG 0x20 // Define write command to register
#define RD_RX_PLOAD 0x61 // Define RX payload register address
#define WR_TX_PLOAD 0xA0 // Define TX payload register address
#define FLUSH_TX 0xE1 // Define flush TX register command
#define FLUSH_RX 0xE2 // Define flush RX register command
#define REUSE_TX_PL 0xE3 // Define reuse TX payload register command
#define NOP 0xFF // Define No Operation, might be used to read status register
// SPI(nRF24L01) registers(addresses) ，NRF24L01 相關寄存器地址的宏定義
#define CONFIG 0x00 // 'Config' register address
#define EN_AA 0x01 // 'Enable Auto Acknowledgment' register address
#define EN_RXADDR 0x02 // 'Enabled RX addresses' register address
#define SETUP_AW 0x03 // 'Setup address width' register address
#define SETUP_RETR 0x04 // 'Setup Auto. Retrans' register address
#define RF_CH 0x05 // 'RF channel' register address
#define RF_SETUP 0x06 // 'RF setup' register address
#define STATUS 0x07 // 'Status' register address
#define OBSERVE_TX 0x08 // 'Observe TX' register address
#define CD 0x09 // 'Carrier Detect' register address
#define RX_ADDR_P0 0x0A // 'RX address pipe0' register address
#define RX_ADDR_P1 0x0B // 'RX address pipe1' register address
#define RX_ADDR_P2 0x0C // 'RX address pipe2' register address
#define RX_ADDR_P3 0x0D // 'RX address pipe3' register address
#define RX_ADDR_P4 0x0E // 'RX address pipe4' register address
#define RX_ADDR_P5 0x0F // 'RX address pipe5' register address
#define TX_ADDR 0x10 // 'TX address' register address
#define RX_PW_P0 0x11 // 'RX payload width, pipe0' register address
#define RX_PW_P1 0x12 // 'RX payload width, pipe1' register address
#define RX_PW_P2 0x13 // 'RX payload width, pipe2' register address
#define RX_PW_P3 0x14 // 'RX payload width, pipe3' register address
#define RX_PW_P4 0x15 // 'RX payload width, pipe4' register address
#define RX_PW_P5 0x16 // 'RX payload width, pipe5' register address
#define FIFO_STATUS 0x17 // 'FIFO Status Register' register address
#define MAX_RT 0x10 //達到最大重發次數中斷標志位
#define TX_DS0x20 //發送完成中斷標志位 //
#define RX_DR0x40 //接收到數據中斷標志位
#define CHANAL40
typedef enum
{
NRF_RxMode,
NRF_TxMode,
}NRF_ModeTypeDef;
static uint8_t NRF_Address[AddressWIDTH]={0xcc,0xcc,0xcc,0xcc,0xcc};//定義NRF的收發地址
static void NRF_Delay(uint32_t ) //延時t微妙
{
/* STM32下的代碼*/
/*
SysTick->VAL=0;
SysTick->LOAD=t*168;
SysTick->CTRL|=1<<0;
while(!SysTick->CTRL&(1<<16));
SysTick->CTRL&=~(1<<0);
*/
}
static uint8_t SPI_SR_Byte(uint8_t Byte)
{
uint8_t Buff=0,Cnt;
NRF_SCK_LOW();
for(Cnt=0;Cnt<8;Cnt++)
{
if(Byte&0x80)
NRF_MOSI_HIGH();
else
NRF_MOSI_LOW();
Byte<<=1;
Buff<<=1;
NRF_SCK_HIGH();
if(NRF_MISO_Read())
Buff++;
NRF_SCK_LOW();
}
return Buff;
}
static uint8_t NRF_WriteReg(uint8_t Reg,uint8_t Data)
{
uint8_t Status;
NRF_CS_LOW();
Status=NRF_SR_Byte(Reg);
NRF_SR_Byte(Data);
NRF_CS_HIGH();
return Status;
}
static uint8_t NRF_WriteBuff(uint8_t Reg,uint8_t *pData,uint8_t Cnt)
{
uint8_t Status;
NRF_CS_LOW();
Status=NRF_SR_Byte(Reg);
for(;Cnt>0;Cnt--)
{
NRF_SR_Byte(*pBuff++);
}
NRF_CS_HIGH();
return Status;
}
static uint8_t NRF_ReadReg(uint8_t Reg)
{
uint8_t Status;
NRF_CS_LOW();
NRF_SR_Byte(Reg);
Status=NRF_SR_Byte(0xff);
NRF_CS_HIGH();
return Status;
}
static uint8_t NRF_ReadBuff(uint8_t Reg,uint8_t *pBuff,uint8_t Cnt)
{
uint8_t Status;
NRF_CS_LOW();
NRF_SR_Byte(Reg);
for(;Cnt>0;Cnt--)
{
*pBuff=NRF_SR_Byte(0xff);
pBuff++;
}
NRF_CS_HIGH();
return Status;
}
void NRF_ModeInit(NRF_ModeTypeDef NRF_Mode)
{
if(NRF_Mode==NRF_TxMode)
{
NRF_CE_LOW();
NRF_WriteBuff(NRF_WRITE_REG+TX_ADDR,NRF_Address,AddressWIDTH);
NRF_WriteBuff(NRF_WRITE_REG+RX_ADDR_P0,NRF_Address,AddressWIDTH);
NRF_WriteReg(NRF_WRITE_REG+EN_AA,0x01); //使能通道0的自動應答 NRF_WriteReg(NRF_WRITE_REG+EN_RXADDR,0x01); //使能通道0的接收地址
NRF_WriteReg(NRF_WRITE_REG+SETUP_RETR,0x1a);//設置自動重發間隔時間:500us + 86us;最大自動重發次數:10次
NRF_WriteReg(NRF_WRITE_REG+RF_CH,CHANAL); //設置RF通道為CHANAL
NRF_WriteReg(NRF_WRITE_REG+RF_SETUP,0x0f); //設置TX發射參數,0db增益,2Mbps,低噪聲增益開啟
NRF_WriteReg(NRF_WRITE_REG+CONFIG,0x0e); //配置基本工作模式的參數;PWR_UP,EN_CRC,16BIT_CRC,發射模式,開啟所有中斷
/*CE拉高，進入發送模式*/
NRF_CE_HIGH();
NRF_Delay(0xfff); //CE要拉高一段時間才進入發送模式
}
else
{
NRF_CE_LOW(); NRF_WriteBuff(NRF_WRITE_REG+RX_ADDR_P0,NRF_Address,AddressWIDTH);//寫RX節點地址
NRF_WriteReg(NRF_WRITE_REG+EN_AA,0x01); //使能通道0的自動應答
NRF_WriteReg(NRF_WRITE_REG+EN_RXADDR,0x01);//使能通道0的接收地址
NRF_WriteReg(NRF_WRITE_REG+RF_CH,CHANAL); //設置RF通信頻率
NRF_WriteReg(NRF_WRITE_REG+RX_PW_P0,DataWIDTH);//選擇通道0的有效數據寬度
NRF_WriteReg(NRF_WRITE_REG+RF_SETUP,0x0f); //設置TX發射參數,0db增益,2Mbps,低噪聲增益開啟
NRF_WriteReg(NRF_WRITE_REG+CONFIG, 0x0f); //配置基本工作模式的參數;PWR_UP,EN_CRC,16BIT_CRC,接收模式
/*CE拉高，進入接收模式*/
NRF_CE_HIGH();
}
}
uint8_t NRF_TxData(uint8_t *pBuff)
{
uint8_t Status;
NRF_CE_LOW();
NRF_WriteBuff(WR_TX_PLOAD,pBuff,DataWIDTH);
NRF_CE_HIGH();
while(!NRF_IRQ_Read());
Status=NRF_ReadReg(STATUS);
/*清除TX_DS或MAX_RT中斷標志*/
NRF_WriteReg(NRF_WRITE_REG+STATUS,Status);
NRF_WriteReg(FLUSH_TX,NOP); //清除TX FIFO寄存器
/*判斷中斷類型*/
if(Status&MAX_RT) //達到最大重發次數
return MAX_RT;
else if(Status&TX_DS) //發送完成
return TX_DS;
else
return ERROR; //其他原因發送失敗
}
uint8_t NRF_RxData(uint8_t *pBuff)
{
uint8_t Status;
NRF_CE_HIGH(); //進入接收狀態
/*等待接收中斷*/
while(NRF_IRQ_Read()!=0);
NRF_CE_LOW(); //進入待機狀態
/*讀取status寄存器的值 */
Status=NRF_ReadReg(STATUS);
/* 清除中斷標志*/
NRF_WriteReg(NRF_WRITE_REG+STATUS,Status);
/*判斷是否接收到數據*/
if(Status&RX_DR) //接收到數據
{
NRF_ReadBuff(RD_RX_PLOAD,pBuff,DataWIDTH);//讀取數據
NRF_WriteReg(FLUSH_RX,NOP); //清除RX FIFO寄存器
return RX_DR;
}
else
return ERROR; //沒收到任何數據
}
uint8_t NRF_Check(void)
{
uint8_t TxBuff[5]={0xaa,0xaa,0xaa,0xaa,0xaa};
uint8_t RxBuff[5],Cnt=5;
NRF_WriteBuff(NRF_WRITE_REG+TX_ADDR,TxBuff,5);
NRF_ReadBuff(TX_ADDR,RxBuff,5);
for(Cnt=0;Cnt<5;Cnt++)
{
if(RxBuff[Cnt]!=0xaa)
return 1;//錯誤
}
return 0;//連接正確
}
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