delay_50us(1); P0=cmd; E=1;
delay_50us(10); E=0;
delay_50us(2); }
void write_dat(uchar dat) {
RS=1; RW=0;
delay_50us(1); P0=dat; E=1;
delay_50us(10); E=0;
delay_50us(2); }
void init_12864() { E=0;
delay_50ms(2); write_cmd(0x30); delay_50us(4); write_cmd(0x30); delay_50us(4); write_cmd(0x0c); delay_50us(4); write_cmd(0x01); delay_50us(240); write_cmd(0x06); delay_50us(10); }
void zifu(uchar adr,const uchar * pt,uchar num) {
uchar i;
write_cmd(adr);
for(i = 0;i < (num*2);i++) write_dat(*(pt++)); }
//*****************************************长延时***************************************** void Delay(uint s) {
uint i;
27
基于nRF2401无线传输的集温湿度与光照监测系统
for(i=0; i //****************************************************************************************** uchar bdata sta; //状态标志 sbit RX_DR =sta^6; sbit TX_DS =sta^5; sbit MAX_RT =sta^4; /****************************************************************************************** /*延时函数 /******************************************************************************************/ void inerDelay_us(uchar n) { for(;n>0;n--) _nop_(); } //**************************************************************************************** /*NRF24L01初始化 //***************************************************************************************/ void init_NRF24L01(void) { 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); // 写本地地址 SPI_Write_Buf(WRITE_REG + RX_ADDR_P1, RX_ADDRESS, RX_ADR_WIDTH); // 写接收端地址 P0 SPI_RW_Reg(WRITE_REG + EN_AA,0x03); // 频道0 - 5 自动 ACK应答允许 SPI_RW_Reg(WRITE_REG + EN_RXADDR,0x03); // 允许接收地址频道0 - 5 SPI_RW_Reg(WRITE_REG + RF_CH, 0); // 设置信道工作为2.4GHZ，收发必须一致 SPI_RW_Reg(WRITE_REG + RX_PW_P1, RX_PLOAD_WIDTH); //设置接收数据长度，本次设置为RX_PLOAD_WIDTH字节 SPI_RW_Reg(WRITE_REG + RF_SETUP, 0x07); //设置发射速率为1MHZ，发射功率为最大值0dB CE=1; // chip disable } /**************************************************************************************************** /*函数：uint SPI_RW(uint uchar) /*功能：NRF24L01的SPI写时序 28 /****************************************************************************************************/ uchar SPI_RW(uchar byte) { uchar bit_ctr; for(bit_ctr=0;bit_ctr<8;bit_ctr++) // output 8-bit { MOSI = (byte & 0x80); // output 'uchar', MSB to MOSI byte = (byte << 1); // shift next bit into MSB.. SCK = 1; // Set SCK high.. byte |= MISO; // capture current MISO bit SCK = 0; // ..then set SCK low again } return(byte); // return read uchar } /**************************************************************************************************** /*函数：uchar SPI_Read(uchar reg) /*功能：NRF24L01的SPI时序 /****************************************************************************************************/ 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读写寄存器函数 /****************************************************************************************************/ uchar SPI_RW_Reg(uchar reg, uchar value) { uchar 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 29 基于nRF2401无线传输的集温湿度与光照监测系统 return(status); // return nRF24L01 status uchar } /****************************************************************************************************/ /*函数：uint SPI_Read_Buf(uchar reg, uchar *pBuf, uchar uchars) /*功能: 用于读数据，reg：为寄存器地址，pBuf：为待读出数据地址，uchars：读出数据的个数 /****************************************************************************************************/ uchar SPI_Read_Buf(uchar reg, uchar *pBuf, uchar uchars) { uchar 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 CSN = 1; return(status); // return nRF24L01 status uchar } /********************************************************************************************************* /*函数：uint SPI_Write_Buf(uchar reg, uchar *pBuf, uchar uchars) /*功能: 用于写数据：为寄存器地址，pBuf：为待写入数据地址，uchars：写入数据的个数 /*********************************************************************************************************/ uchar SPI_Write_Buf(uchar reg, uchar *pBuf, uchar uchars) { uchar status,uchar_ctr; CSN = 0; //SPI使能 status = SPI_RW(reg); for(uchar_ctr=0; uchar_ctr CSN = 1; //关闭SPI return(status); // } /****************************************************************************************************/ /*函数：void SetRX_Mode(void) /*功能：数据接收配置 /****************************************************************************************************/ void SetRX_Mode(void) 30 { CE=0; SPI_RW_Reg(WRITE_REG + CONFIG, 0x0f); // IRQ收发完成中断响应，16位CRC ，主接收 CE = 1; inerDelay_us(130); } /******************************************************************************************************/ /*函数：unsigned char nRF24L01_RxPacket(unsigned char* rx_buf) /*功能：数据读取后放如rx_buf接收缓冲区中 /******************************************************************************************************/ uchar nRF24L01_RxPacket(uchar *rx_buf) { uchar revale=0; SPI_Write_Buf(WRITE_REG + RX_ADDR_P0,RX_ADDRESS, RX_ADR_WIDTH); CE=0; SPI_RW_Reg(WRITE_REG + CONFIG, 0x0f); // IRQ收发完成中断响应，16位CRC ，主接收 CE = 1; inerDelay_us(130); sta=SPI_Read(STATUS); // 读取状态寄存其来判断数据接收状况 if(RX_DR) // 判断是否接收到数据 { CE = 0; //SPI使能 do { SPI_Read_Buf(RD_RX_PLOAD,rx_buf,RX_PLOAD_WIDTH);// read receive payload from RX_FIFO buffer } while (SPI_Read(FIFO_STATUS)%2==0); revale =1; //读取数据完成标志 if(SPI_Read(FIFO_STATUS)%2==1) { } else if(SPI_Read(FIFO_STATUS)%2==0) { } write_cmd(0x93); write_dat(rx_buf[1]/10+0x30); write_dat(rx_buf[1]+0x30); write_dat(' '); write_dat(9); 31