u8 NRF24L01_RxPacket(u8 *rxbuf)
{
u8 sta;
sta=SPI_R_byte(STATUS); //读取状态寄存器的值
SPI_W_Reg(W_REGISTER+STATUS,sta); //清除TX_DS或MAX_RT中断标志
if(sta&RX_OK)//接收到数据
{
SPI_R_DBuffer(R_RX_PLOAD,rxbuf,RX_PLOAD_WIDTH);//读取数据
SPI_W_Reg(FLUSH_RX,0xff);//清除RX FIFO寄存器
return 0;
}
return 1;//没收到任何数据
}
/**************************************************/
char SPI_Read(char reg)
{
char reg_val;
RF24L01_CSN_0; // CSN low, initialize SPI communication...
SPI_RW(reg); // Select register to read from..
reg_val = SPI_RW(0); // ..then read registervalue
RF24L01_CSN_1; // CSN high, terminate SPI communication
return(reg_val); // return register value
}
char SPI_RW_Reg(char reg, char value)
{
char status1;
RF24L01_CSN_0; // CSN low, init SPI transaction
status1 = SPI_RW(reg); // select register
SPI_RW(value); // ..and write value to it..
RF24L01_CSN_1; // CSN high again
return(status1); // return nRF24L01 status uchar
}
char SPI_W_Reg(char reg){
char status1;
RF24L01_CSN_0; // CSN low, init SPI transaction
status1 = SPI_RW(reg); // select register
RF24L01_CSN_1; // CSN high again
return(status1);
}
char SPI_Read_Buf(char reg, char *pBuf, char chars)
{
char status2,uchar_ctr;
RF24L01_CSN_0; // Set CSN low, init SPI tranaction
status2 = SPI_RW(reg); // Select register to write to and read status uchar
for(uchar_ctr=0;uchar_ctr<chars;uchar_ctr++)
{
pBuf[uchar_ctr] = SPI_RW(0); //
}
RF24L01_CSN_1; // Set CSN high
return(status2); // return nRF24L01 status uchar
}
char SPI_Write_Buf(char reg, char *pBuf, char chars)
{
char status1,uchar_ctr;
RF24L01_CSN_0; // Set CSN low, init SPI tranaction
status1 = SPI_RW(reg); // Select register to write to and read status byte
for(uchar_ctr=0; uchar_ctr<chars; uchar_ctr++) // then write all byte in buffer(*pBuf)
{
SPI_RW(*pBuf++);
}
RF24L01_CSN_1; // Set CSN high
return(status1); //
}
void SetRX_Mode(void)
{
RF24L01_CE_0 ;
SPI_RW_Reg(WRITE_REG + CONFIG, 0x3B); // Set PWR_UP bit, enable CRC(2 bytes) & Prim:RX. RX_DR enabled..
RF24L01_CE_1; // Set CE pin high to enable RX device
inerDelay_us(1000);//delay for about 1 second
}
char nRF24L01_RxPacket(char* rx_buf)
{
char revale=0;
sta=SPI_Read(STATUS); // read register STATUS's value
if(sta&0x40) // success!
{
RF24L01_CE_0 ; //SPI enable
SPI_Read_Buf(RD_RX_PLOAD,rx_buf,TX_PLOAD_WIDTH);// read receive payload from RX_FIFO buffer
revale =1; //set flag to 1
}
SPI_RW_Reg(WRITE_REG+STATUS,sta);
return revale;
}
void nRF24L01_TxPacket(char * tx_buf)
{
RF24L01_CE_0 ; //StandBy
SPI_Write_Buf(0x2A, TX_ADDRESS, TX_ADR_WIDTH); // RX_Addr0 same as TX_Adr for Auto.Ack
SPI_Write_Buf(0x30, TX_ADDRESS, TX_ADR_WIDTH);
SPI_RW_Reg(0x20,0x0A);
SPI_Write_Buf(0xA0, tx_buf, 0x05); // Writes data to TX payload
RF24L01_CE_1; // finish
inerDelay_us(1000);
}
//****************************************************************************************
//NRF24L01 init
//***************************************************************************************/
void init_NRF24L01(void)
{
inerDelay_us(1000);
RF24L01_CE_0 ; // chip enable
RF24L01_CSN_1; // Spi disable
RF24L01_SCK_0; // Spi clock line init high
inerDelay_us(15);
SPI_Write_Buf(0x2B, TX_ADDRESS, TX_ADR_WIDTH);
inerDelay_us(15);
SPI_RW_Reg(WRITE_REG + RF_CH, 0x00);
inerDelay_us(20);
//SPI_RW_Reg(WRITE_REG + SETUP_RETR, 0x00);
inerDelay_us(20);
SPI_RW_Reg(0x25,0x00);
SPI_RW_Reg(0x31, 0x05);
inerDelay_us(20);
SPI_RW_Reg(0x32, 0x05);
inerDelay_us(20);
SPI_RW_Reg(WRITE_REG + RF_SETUP, 0b00100110);
inerDelay_us(20);
SPI_RW_Reg(0x31, 0x05);
inerDelay_us(20);
SPI_RW_Reg(0x32, 0x05);
inerDelay_us(20);
SPI_RW_Reg(0x21, 0x00); //disable acks!!
inerDelay_us(20);
SPI_RW_Reg(0x20, 0x00);
inerDelay_us(20);
SPI_RW_Reg(0x27, 0x30);
inerDelay_us(20);
SPI_W_Reg(FLUSH_RX);
inerDelay_us(20);
}
//启动NRF24L01发送一次数据
//txbuf:待发送数据首地址
//返回值:发送完成状况
u8 NRF24L01_TxPacket(u8 *txbuf)
{
u8 sta;
CE_CLR;
SPI_W_DBuffer(W_TX_PLOAD,txbuf,TX_PLOAD_WIDTH);//写数据到TX BUF 32个字节
CE_SET;//启动发送
while(IRQ_S!=0);//等待发送完成
sta=SPI_R_byte(STATUS); //读取状态寄存器的值
SPI_W_Reg(W_REGISTER+STATUS,sta); //清除TX_DS或MAX_RT中断标志
if(sta&MAX_TX)//达到最大重发次数
{
SPI_W_Reg(FLUSH_TX,0xff);//清除TX FIFO寄存器
return MAX_TX;
}
if(sta&TX_OK)//发送完成
{
return TX_OK;
}
return 0xff;//其他原因发送失败
}
//该函数初始化NRF24L01到RX模式
//设置RX地址,写RX数据宽度,选择RF频道,波特率和LNA HCURR
//当CE变高后,即进入RX模式,并可以接收数据了
void NRF24L01_RX_Mode(void)
{
CE_CLR;
SPI_W_DBuffer(W_REGISTER+RX_ADDR_P0,(u8*)RX_ADDRESS,RX_ADR_WIDTH);//写RX节点地址
SPI_W_Reg(W_REGISTER+EN_AA,0x01); //使能通道0的自动应答
SPI_W_Reg(W_REGISTER+EN_RX_ADDR,0x01);//使能通道0的接收地址
SPI_W_Reg(W_REGISTER+RF_CH,40); //设置RF通信频率
SPI_W_Reg(W_REGISTER+RX_PW_P0,RX_PLOAD_WIDTH);//选择通道0的有效数据宽度
SPI_W_Reg(W_REGISTER+RF_SETUP,0x0f);//设置TX发射参数,0db增益,2Mbps,低噪声增益开启
SPI_W_Reg(W_REGISTER+CONFIG, 0x0f);//配置基本工作模式的参数;PWR_UP,EN_CRC,16BIT_CRC,接收模式
CE_SET; //CE为高,进入接收模式
}
//该函数初始化NRF24L01到TX模式
//设置TX地址,写TX数据宽度,设置RX自动应答的地址,填充TX发送数据,选择RF频道,波特率和LNA HCURR
//PWR_UP,CRC使能
//当CE变高后,即进入RX模式,并可以接收数据了
//CE为高大于10us,则启动发送.
void NRF24L01_TX_Mode(void)
{
CE_CLR;
SPI_W_DBuffer(W_REGISTER+TX_ADDR,(u8*)TX_ADDRESS,TX_ADR_WIDTH);//写TX节点地址
SPI_W_DBuffer(W_REGISTER+RX_ADDR_P0,(u8*)RX_ADDRESS,RX_ADR_WIDTH); //设置TX节点地址,主要为了使能ACK
SPI_W_Reg(W_REGISTER+EN_AA,0x01); //使能通道0的自动应答
SPI_W_Reg(W_REGISTER+EN_RX_ADDR,0x01); //使能通道0的接收地址
SPI_W_Reg(W_REGISTER+SETUP_RETR,0x1a);//设置自动重发间隔时间:500us + 86us;最大自动重发次数:10次
SPI_W_Reg(W_REGISTER+RF_CH,40); //设置RF通道为40
SPI_W_Reg(W_REGISTER+RF_SETUP,0x0f); //设置TX发射参数,0db增益,2Mbps,低噪声增益开启
SPI_W_Reg(W_REGISTER+CONFIG,0x0e); //配置基本工作模式的参数;PWR_UP,EN_CRC,16BIT_CRC,接收模式,开启所有中断
CE_SET;//CE为高,10us后启动发送
delay_ms(1);
}